2017 Vol. 23, No. 3

Display Method:
METHODS FOR THE PRODUCTION OF FIELD FREE-HAND MAPS AND GEOGRAPHIC BASEMAPS IN DIGITAL GEOLOGICAL MAPPING
YANG Xing-chen, YE Pei-sheng, CAI Mao-tang, ZHOU Wei
2017, 23(3): 333-338.
Abstract (198) HTML (215) PDF (2245KB)(7)
Abstract:
Digital mapping system realizes the informatization in the whole process of regional geological survey from field data acquisition, data processing to result output and so on. Accurate and rapid production of field free-hand maps and basemaps is the foundation of field investigation work. According to the 1:50000 scale regional geological survey, the transformation process of terrain data coordinate system is presented and a set of methods for the rapid production of field free-hand maps and basemaps that meet the relevant accuracy requirements are summarized.The first step is using the "workspace direct projection transformation" function in the projection transformation module of Mapgis 67 to enlarge the 1:50000 scale data. The second step is cutting out the enlarged 1:25000 scale terrain vector data with the Section widget.The third step is adding the latest terrain and surface features according to the remote-sensing image data to achieve the final drawing of geographic basemaps.
THE DISTRIBUTION AND PERIOD DIVISION OF HOLOCENE PALAEO CHANNELS OF THE YELLOW RIVER IN HETAO AREA
ZHOU Qing-shuo, ZHANG Xu-jiao, YE Pei-sheng, HE Ze-xin, CAI Mao-tang, LIU Xiao-tong, LI Cheng-lu, WU Ze-qun
2017, 23(3): 339-347.
Abstract (350) HTML (216) PDF (2882KB)(31)
Abstract:
The distribution of palaeo channels of the Yellow River and the establishment of Chronological framework are of great significance to explore the rule of the Yellow River migration and reconstruct the history of palaeoclimate. Based on the Remote Sensing Image solution translation of Landsat 8 and the analysis of 1:50000 field geological and geomorphical survey and the drill data, combined with the measured profile, it is basically determined that there is the distribution of palaeo channels buried under the Modern Yellow River in Hetao Plain from the south of Seertang mountains to the north of modern Yellow River.In the meantime, using OSL and 14C dating, the age of the palaeo channels of the Yellow River are accurately determined.According to the results of chronology research, the palaeo channels of the Yellow River in Holocene are divided into three phases:Phase I, the palaeo channels were formed by north branch which spread in the northwest of Fuxing Town with the burial depth of 2~6 m and south branch which spread in the south central of Hulesitai with the burial depth of 8.2~9 m, and the age is 9.93~7.4 kaB.P; Phase Ⅱ, the principle parts of the palaeo channels mainly spread in front of the Seertang mountains, with the direction of NW-SE, buried at 4~11 m of the bottom of the palaeo channels of the Ugab River with the widest part of 1.5 km in NS direction. There were palaeo channels of the same phase in Taal Lake Areawith the burial depth of 7~9 m and its age is 7.4~4.1 ka B.P; Phase Ⅲ, the palaeo channels in the central Hulesitai, the south central of Taal Lake and the south of Fuxing once all developed, but the main bodies were the palaeo channels in Taal Lake Area, with the burial depth of 2~9 m, and the age is 4.1~1.2 ka B.P. The identification of distribution and ages of the palaeo channels of the Yellow River helps to study the evolution history of the Yellow River in Hetao Area and provides reference for water conservancy construction and agricultural production in Hetao Area.
GEOCHEMICAL CHARACTERISTICS AND ENVIRONMENTAL SIGNIFICANCE OF THE CARBONATE ROCKS IN QIXIA-MAOKOU FORMATION IN WESTERN ZHENXIONG, NORTHEASTERN YUNNAN
PAN Ming, HAO Yan-zhen, LV Yong, SHAN Ke-qiang, SU Guang-yang
2017, 23(3): 348-357.
Abstract (266) HTML (177) PDF (3718KB)(12)
Abstract:
Qixia-Maokou Formation in Middle Permain, in Anjiaba of Zhenxiong County, is well outcropped and continuously deposited. Making this section as the research object, collecting 42 samples of carbonate rocks, based on the microscopic characteristics, the elements correlation, the elements content as well as the ratio characteristics of the related elements, the geochemical characteristics and the paleo environmental significance of the carbonate rocks in the study area were discussed. Some conclusions have been drawn. Firstly there are obvious negative correlations between CaO and SiO2, MgO in the rock samples, and the contents of the latter two in rocks are rather low, which both indicate that the samples are less affected and transformed by the terrigenous material in the process of deposition and diagenesis. Secondly, based on the analysis of the element contents and the vertical distribution characteristics of the relevant elements ratios, such as Sr/Ba, MgO/CaO and V/V+Ni etc, and the study of the paleo-water depth and the paleo-oxygenation facies in different sedimentary stages, the data show that compared with Qixia Formation, the sedimentary environment of Maokou Formation has obvious difference.
GEOCHEMISTRY CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF THE HAERTEERDELE GRANITE MASS IN MIDDLE DEVONIAN IN BEISHAN, GANSU
JI Bo, YU Ji-yuan, GUO Lin, GUO Lei, BU Tao
2017, 23(3): 358-368.
Abstract (248) HTML (106) PDF (3159KB)(11)
Abstract:
The Haerteerdele granite mass in Niuquanzi shows a high content of Si (>72.2%), alkaline(AR=2.9~5.1, K2O=3.86%~5.49%, Na2O=3.04%~3.83%)and FeOT/Mg(3.29~13.47), and a low content of Al2O3(11.48%~13.42%), CaO(0.57%~2.27%), MgO(0.14%~0.78%) and FeOT(1.33%~2.34%).It is determined that the granites are peraluminous granitoids of the calc-alkaline suite (A/NK=1.43~1.77, A/CNK=1.35~1.4), with the characteristics that an enriched pattern with a high ΣREE content and a slight high LREE content ((La/Yb)N=4.9~16), unapparent fractionation of heavy and rare earth elements, obvious Eu negative abnormality(δEu=0.12~0.21), relatively large concentration of large ion lithophile elements such as Rb, K, Pb, strong depletion of the elements of Ba、Sr、P、Ti, Eu, and weak depletion of Ta, Nb and other elements. Also the granites have the similar value in Nb/Ta and Nd/Th with the earthcrust, showing the characteristic of typeA (A2) granite. The chronology result of LA-ICP-MS zircon dating shows the age of 206Pb/238U of the Haerteerdele granite mass is 371.7±2.9Ma, which represents the formation age of the granite mass and the formation period is the middle Devonian. Taking into consideration the regional tectonic evolution and the comparison with the contemporary type A granite, it shows that the granite mass is the product of postcollision to extension.
A STUDY ON THE PETROGENESIS AND TECTONIC SETTING OF THE SIBAN GRANITE MASS IN ZHALANTUN AREA, GREAT KHINGAN
QIN Tao, LI Lin-chuan, TANG Zheng, JIANG Bin, QIAN Chen, SUN Wei, NA Fu-chao, SHI Lu
2017, 23(3): 369-381.
Abstract (144) HTML (49) PDF (3465KB)(5)
Abstract:
The Siban rock mass in Zhalantun area of Great Khingan is mainly composed of syenogranites and monzonitic granites with fine-grained diorite enclaves developed inside. LA-ICP-MS zircon U-Pb dating results reveal that the crystallization ages of the monzonitic granite and syenogranite in the Siban rock mass are 291±3 Ma and 303±3 Ma respectively, proving that the Siban rock mass emplaced during the late Paleozoic era. The geochemical results of the whole-rock major and trace elements exhibit that the Siban granite yields high SiO2 (67.9~77.5 wt%), alkaline components (w (Na2O+K2O)=7.55~10.79 wt%) and Al2O3 (12.05~16.33 wt%). It is also highly enriched with LREE and LILE while with a depletion of HFSE (e.g. Nb, Ta, Ti and P), which is comparable to high K calc-alkalne I-type granite. The existence of fine-grained diorite enclaves and associated basic rocks developed inside the Siban granlte reveals that the Siban granite has the characteristics of magma mixing between mantle and crustal magmas and subsequently underwent the fractional crystallizations of pyroxene, amphibole, Ti-enriched minerals, plagioclase and apatite, which is supported by their geochemical features. Taken all together, the petrologies, geochemistries and petrogenesises indicate that the Siban rock mass is akin to the post-collision granite and formed by mantle-crust interactions under the delamination of lithospheric mantle environment.
ZIRCON U-PB CHRONOLOGY AND GEOCHEMICAL CHARACTERISTICS OF THE WUHEERTU GRANITE MASS IN LANGSHAN, INNER MONGOLIA
WANG Wen-long, TENG Xue-jian, LIU Yang, TENG Fei, GUO Shuo, HE Peng, TIAN Jian, DUAN Xiao-long
2017, 23(3): 382-396.
Abstract (260) HTML (120) PDF (4213KB)(13)
Abstract:
The WuheErtu granite mass, with the main rock types of syenogranite and monzogranite, are distributed in Langshan area, Inner Mongolia, northern margin of the North China Plate. Zircon U-Pb ageis 236.1±1.0Ma, indicating the WuherErtu granite mass formed in late Triassic.Geochemical results show high content of SiO2(71.94~73.91%), K2O+Na2O(8.34~8.88%), low content of Ca and Mg, and weak content of aluminum(0.98 < A/CNK < 1.07). In SiO2-K2O diagram, sample points fall into the transitional region between high-K calc-alkaline and Shoshonite series. In the primitive mantle-normalized spider diagram, the geochemical characteristics of the granite mass show in some degree enrichment in Rb、Th、K、Nd、Zr、Hf、Sm and depletion in Ba、Nb、Ta、Sr、P、Ti, with medium to negligible Eu anomalies (δEu=0.47~0.66), which indicate the WuherErtu granite mass belong to the post-collisional granite formed in the tectonic setting transformed from compression system to extension system. Zircon Hf isotopic displays that εHf(t) values vary from -20.6 to +7.6 and Hf model ages (TDM2) vary from 780~2559 Ma, which suggest a mixed magma source of old continental crust with a small involvement of juvenile components.The comprehensive study of this granite mass helps to further understand and explore the tectonic-magmatic evolution of the northern margin of the North China plate in late Permian-Triassic.
GEOCHEMISTRY, CHRONOLOGY AND HF ISOTOPE FEATURES OF THE PERMAIN INTERMEDIATE-BASIC VOLCANIC ROCKS IN WULANAOBAO AREA, URAD HOUQI, INNER MONGOLIA AND ITS GEOLOGICAL SIGNIFICANCE
GUO Shuo, TENG Xue-jian, LIU Yang, TENG Fei, HE Peng, WANG Wen-long, TIAN Jian, DUAN Xiao-long
2017, 23(3): 397-410.
Abstract (206) HTML (95) PDF (3913KB)(8)
Abstract:
The Wulanaobao intermediate-basic volcanic rocks, distributed in Urad Houqi, Inner Mongolia, are located in the western north margin of the north China block. The outcropped lithologies mainly are grey black-spruce basalt, spruce basaltic andesite and greyish-green andesite. All samples show chemical signatures of calc-alkaline series which are characterized by contents of SiO2 (49.33~65.84%), Na2O (0.53~5.49%) and K2O (0.25~6.40%). From basic to intermediate, the amount of rare earth elements, light rare earth elements enrichment degree and Eu negative anomaly degree show a trend of increase. The trace elements show subduction zone arc magmatite features which are characterized by wide depletion of Ta and Nb, and enrichment of the large ion lithophile elements (U, Ba, K). The zircon U-Pb dating results of the magma from volcanic rocks are 285.0±2.3Ma and 265.0±1.5Ma, which indicates that the volcanic rocks were formed at the early-middle Permian period. The age characteristics of captured zircons and the contact relations between volcanic rocks and underlying strata suggest that volcanic rocks from Wulanaobao were formed on the crust of the north China block. Zircon Hf isotopic information indicates that the magma was derived from the depleted mantle which was affected by the subducting plate and partly joined with crust-derived material during the rising stage.
THE PETROLOGY, GEOCHEMICAL CHARACTERISTICS AND ORIGIN OF THE NAPENG GRANITE MASS FORMED IN INDO-CHINA PERIOD IN THE WEST OF GUANGDONG PROVINCE
LI Kun, SUN Wan-cai, DENG Fei
2017, 23(3): 411-421.
Abstract (160) HTML (109) PDF (5320KB)(9)
Abstract:
The Napeng granite mass is the product of migmatization and granitization, in which major lithologies are medium-fine grained (porphyritic) biotite monzonitic migmatitic granite and weak gneissic fine grained biotite monzonitic migmatitic granite, rich in a number of Al-rich minerals such as cordierite, fibrolite, bucholzite, andalusite and so on. The lithologies closed to the edge of Napeng granite mass are migmatitic gneiss and granitic gneiss, migrating to the surrounding rocks. By means of LA-ICP-MS Zircon U-Pb isotope dating on the medium-fine grained biotite monzonitic migmatitic granite, it is found that metamorphic zircons are the main zircons and few are magmatic zircons, and it is determined that the diagenetic age of the Napeng granite mass is 252±1.9Ma, the early Triassic age, in the tectonic environment of collision orogeny.
A STUDY ON THE OIL AND GAS SOURCE OF TONGHUA BASIN, EAST PERIPHERAL BASIN OF SONGLIAO:NWE EVIDENCE FROM TONGDI WELL 1
WANG Dan-dan, ZHOU Xin-gui, LI Shi-zhen, ZHANG Wen-hao, LIU Wei-bin, DONG Qing-shui, MENG Yuan-lin, LIN Yan-hua
2017, 23(3): 422-428.
Abstract (262) HTML (90) PDF (2613KB)(40)
Abstract:
Tonghua basin is a faulted basin developed on the Mesozoic basement with a relatively low exploration degree. Oil and gas was found in Tongdi well 1 in the Sankeyushu sag of Tonghua basin, however, the source of the oil and gas is not clear, which restricts the exploration and development of oil and gas resources in Tonghua basin and its peripheral basins. Based on the comparative analysis on the features of the crude oil in Tongdi well 1 and the biomarker of the core hydrocarbon source rock, it is found that the biomarker distribution features are similar between the crude oil in Tongdi well 1 and black muddy hydrocarbon source rocks of the lower Cretaceous Xiahuapidianzi formation and Hengtongshan formation. It is drawn the conclusion that the crude oil in the Sankeyushu sag is basically from the hydrocarbon source rocks of low Cretaceous Xiahuapidianzi or Hengtongshan formation. This finding broaden the oil and gas exploration filed in Tonghua basin and its surrounding basins, which also provides a great basis for the further study of the basic geological research and exploration of oil and gas in Tonghua basin.
A STUDY ON THE DISTRIBUTION PATTERN OF SUPRASALT FAULT BASED ON NUMERICAL SIMULATION
SONG Sui-hong, HOU Jia-gen, LIU Yu-min, CAO Si-fan, HU Chen-bin
2017, 23(3): 429-435.
Abstract (210) HTML (100) PDF (2824KB)(12)
Abstract:
The shape and distribution patterns of upsalt faults are mainly controlled by the shape of the lower part of the salt body and its corresponding upwelling force. The quantitative research on the formation mechanism and distribution pattern of upsalt faults plays an important role in the interpretation and prediction of upsalt faults, description of the shape of the salt body as well as the migration and accumulation of oil and gas. According to the quantitative relationship between the upwelling force and the shapes of the upsalt faults, three typical types of salt structures are identified in this paper.The distribution pattern of upwelling force is estimated and numerical modeling is conducted respectively for the three types of salt bodies, based on the quantitative relationship. Accordingly, the modeling results show that (1) In the salt structure with constant upwelling force, two symmetrical fault groups with consistent depth distribution are formed parallelly. (2) In the salt structure with linearly changing upwelling force, two fault groups with reversed directions are formed, in which, the distribution of the main faults is shallow and that of the secondary faults is deep and often limited by the former. Within each fault, the fault distribution linearly deepens as the upwelling force weakens, while the shape is not changed. (3) In the salt structure with parabola upwelling force, the two main fault groups are symmetrical with reverse directions. Within each fault, from the tectonic center to the edge, the inclination of the fault becomes less steeper while the distribution deeper, and there are emergence of the secondary faults mostly controlled by the main faults.The simulation results accord with the shape and the fault distribution pattern of the natural salt bodies, which confirms the theory of quantitative relation between upwelling force and shape of fault and the correctness of the simulation results.
THE DEVELOPMENT CHARACTERISTICS OF THE RESIDUAL JURASSIC STRATUM IN SUGANHU BASIN AND THE WEST SECTION OF THE NORTHERN MARGIN OF THE QAIDAM BASIN
WEI Cheng-jie, ZHU Shi-fa, DU Jian-jun, YUE Hui, LI Zong-xing
2017, 23(3): 436-450.
Abstract (188) HTML (81) PDF (5912KB)(7)
Abstract:
Previous exploration and assessment of oil and gas showed that Jurassic stratum in the west section of the northern margin of the Qaidam Basinare are of excellent potential in oil and gas and coal. Based on the previous research, development characteristics of the residual Jurassic stratum in the west section of the northern margin of the Qaidam Basin are studied systemically through field outcrops, cores, drilling and seismic data, and the distribution characteristics are determined preliminarily. Jurassic could be divided into several formations from bottom to top, including Huxishan and Xiaomeigou formation in the lower part, Dameigou formation in the middle part, and Caishiling and Hongshuigou formation in the upper part. The Lower Jurassic mainly distributes in Lenghu structural belt(Huxishan formation)in the Southern Suganhu Basin, and Xiangyang coal mine in the eastern Suganhu basin(Xiaomeigou formation). The lithology of lower Huxishan Formation consists of thick coarse sediments which show features of subaqueous fan sedimentation, and the thick dark shales develop in the upper formation; Xiaomeigou Formation is thinner with coarser sediments which are suitable for the development of coalbed. The Middle and Upper Jurassic stratum mainly developped in the Saishiteng sag and the West Depression, Central Depression and Xiangyang coal mine inside the Suganhu Basin. According to the drilling data, it is mainly the fifth to seventh member of Dameigou formation that developed inside Suganhu Basin, with lithology of grey, ash black shale interbedded with fine sandstone, conglomerate and thin coal layer, and the fifth member is predominant coalbeds and oil and gas hydrocarbon source rocks. The lithology of Upper Jurassic is brownish red shale interbedded with conglomerate and sandstone. The distribution of residual stratum is basically controlled by the transfer of the deposit center and the distribution of the fractures.
A REVIEW ON THE RESEARCH PROGRESS OF SPATIAL CHARACTERISTICS OF LISTRIC FAULT
CHEN Ya-jun, FU Guang, BAO Ying-chun, HU Ming, CHEN Xue-qing, LI Shi-zhao
2017, 23(3): 451-458.
Abstract (186) HTML (96) PDF (2607KB)(24)
Abstract:
Affected by the multiple solutions and limitations of the seismic data interpretation, seismic data interpretation in sedimentary basin is of poor quality and the fault information from seismic data interpretation can't expose the characteristics of the fault space development. With that in mind, based on the brittle plasticity fault development characteristics and fault refraction mechanism, the listric fault spatial characteristics were studied from the aspects of fault spatial displacement relation, inclination angle shearing method model and fault plane spatial combined stress distribution. The comprehensive study results show that the space formed by the hanging wall and footwall of listric fault isn't in a wedge mode but an alternative mode between local compact structure zone and local extension peeling zone. According to the diagram of the displacement relation of the fault space, the smaller the included angle θ between listric fault strike displacement and dip displacement, the greater the stress along trend, the higher of the traction degree towards the stratum, and the thicker the oil-bearing structure favorable to accumulate oil. Inclined shearing method model can predict the actual slip depth of listric faults, strengthening the consciousness of the structure characteristics of middle and deep structures. Listric fault is closed while it's fault plane refraction crack filled by mineral vein, and when combined stress of listric fault plane space is greater than or equal to its compressive strength affecting on rocks, it will cause the closure of the crack or the material compaction, which is favorable for the seal of oil and gas.
THE DEVELOPMENT CHARACTERISTICS OF STRIKE-SLIP FAULTS AND THE ESTIMATION OF STRIKE-SLIP DISPLACEMENTS OF THE EASTERN LIAODONG BAY DEPRESSION
FANG Lu, WU Zhi-ping, LI Wei, ZHANG Jing, XIAO Yao, ZHANG Xi
2017, 23(3): 459-466.
Abstract (193) HTML (116) PDF (3376KB)(18)
Abstract:
Based on plenty of three dimensional seismic data, the horizontal and sectional characteristics of three main strike-slip faults in detail in the eastern Liaodong Bay Depression are described. Different faults have different characteristics and even the same fault has segmented differential features. The overall degree of strike-slip gradually increased from east to west, from north and south to the middle. With the method of physical modeling test, the strike-slip displacements of three main strike-slip faults in the eastern Liaodong Bay depression are estimated. The results show that the strike-slip displacement of Liaozhong Area is larger than that of Liaodong Area, and the strike-slip displacement and average strike-slip speeds of three strike-slip faults are the maximum in the Oligocene, illustrating there were strong strike-slips in the Oligocene.
THE APPLICATION OF GEOSTRESS LAYERING TECHNOLOGY IN FRACTURE DESIGN OPTIMIZATION
ZHANG Mei-ling, DONG Chuan-lei, LIN Jian-hua
2017, 23(3): 467-474.
Abstract (236) HTML (119) PDF (2524KB)(20)
Abstract:
The distribution of longitudinal continuous geostress is of great guiding significance for fracture construction design. Take putaohua reservoir in weixing oil-field as the research object, combined with the actual fracturing data of the reservoirs, the mathematical model of the minimum geostress which is calculated by the continuous logging data is optimized to establish, offering the reasonable continuous geostress profile along the well shaft. Based on the layers of the spontaneous potential curve, getting a value of curves of stress profile and natural gamma according to certain rules, parameters of interlayer thickness, interlayer stress difference and interlayer quality between the to-be fractured layers and on (under) interlayers layers are calculate. the actual fracture design data of the study area are used to avoid the channeling during the fracturing process. This study provides the constraint conditions of the construction parameters of rock formations, such as fracturing displacement, sand filling intensity, liquid quantity per unit thickness and fracturing way. The application of actual experience shows that the conditions can effectively guarantee the success rate of the fracturing technology of mineral exploration and development.
A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE
CHEN Li-zhong, HONG Bo, ZHANG Quan-feng, ZENG Lian-bo, QIU Jun, LI Ran, DAI Jin-xiong
2017, 23(3): 475-486.
Abstract (845) HTML (479) PDF (3411KB)(8)
Abstract:
In order to more scientifically guide the site selection of CNNC nuclear technology industrial park, it is necessary to analyze the in situ stress state and the distribution law of the rock mass within the scope of the project area of the preselected site. Therefore, in-situ stress measurement was carried out by hydraulic fracturing in two 450 mdrilling in the project area, and 4 methods were used in the data processing stage to determine the instantaneous shut-in pressure to make sure the principal stress value reliable and accurate. The hydro-fracturing test results indicate that the maximum horizontal principal stress value is 6.66~25.91 MPa and the minimum is 3.94~15.76 MPa. The stress regime is SH > Sh > Sv, showing that the stress filed is dominated by the tectonic horizontal stress, and this kind of stress state is beneficial to reverse fault activities. The fracture impression test results show that the orientation of the principal horizontal stress in the project area is dominantly in the NE direction, which is in general agreement with that of regional tectonic stress field. Based on the measured data, the stress state parameters Kav, KHv, KHh, μm and τm were calculated, and the fault activity of the preselected site was analyzed using Coulomb friction sliding criterion, so as to synthetically evaluate the impact of the stress field characteristicsof the preselected site on the stability of rock mass engineering.
A STUDY ON ORE PROSPECTING WITH PEDOGEOCHEMISTRY IN SEMI-DESERT AND GOBI AREA——TAKING TABUGE AREA IN ALIXA RIGHT BANNER OF INNER MONGOLIA AS A CASE
SU He, ZHANG Shanmin, LIU Changfeng, LIU Wencan, SU Shengmin
2017, 23(3): 487-497.
Abstract (222) HTML (172) PDF (3660KB)(9)
Abstract:
Desert, gobi and mountain are the main topographic features of Tabuge area, Alixa right banner, Inner Mongolia. On the basis of soil geochemical survey at scale of 1:10000 in Tabuge area, the geological characteristics are summarized and characteristics like the elemental content, anomalous assemblage and soil geochemical anomaly are studied in this article. The results suggest that Au, Ag and Pb have high anomaly intensity, large scale, and obvious concentration center and concentration zone.The multi-element anomaly is well fitted, corresponds to geological structure, and the anomaly verification shows that there are gold-bearing quartz veins, with Au, Ag and Pb as the main ore-forming elements and As, Sb, Bi, Hg, Sn, Cu, Mo, Zn, W the ore-forming indicator elements. Considering the geological ore-forming background and characteristics of geochemical anomaly, two gold-based multi-metal prospecting target fields are set up in the area. It is believed that the main mineral to study should be gold, and the main mineralization type should be the gold polymetallic mineralization of structural hydrothermal type which is related to tough-brittle tectonic deformation.
A STUDY ON THE RECYCLING UTILIZATION OF GEOTHERMAL RESOURCES IN BINHAI NEW AREA, TIANJIN——STUDY AND DEMONSTRATION OF THERMAL STORAGE AND REINJECTION TECHNOLOGY OF GUANTAO RESERVOIR
RUAN Chuan-xia, FENG Shu-you, SHEN Jian, LIN Li, JIANG Guo-sheng
2017, 23(3): 498-506.
Abstract (178) HTML (129) PDF (3129KB)(21)
Abstract:
Sustainable reinjection is the basis of geothermal resource recycling. The reason of reinjection decrease is summarized through the analysis of reservoir sensitivity, blocking factors, well completion structure and ground installation, in which it is believed that physical blocking is the main cause of reinjection blocking. The well completion structure is the key to keep sustainable reinjection, while standard ground equipment can help avoiding blocking caused by physical and chemical reasons. In this article, successful well completion construction and standard ground installation are applied to the demonstration project construction of geothermal resources recycling of thermal storage and reinjection of Guantao Reservoir, and the reinjection rate is 100~123 m3/h, which is a breakthrough of thermal storage and reinjection of Guantao Reservoir and guarantees the recycling of geothermal resources of Guantao Reservoir in Binhai New Area, Tianjin.