2003 Vol. 9, No. 2

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ORIGIN OF PSEUDOTACHYLITES FROM THE EASTERN DABIESHAN OROGENIC BELT
LIU Jian-min, DONG Shu-wen, ZHANG Jia-sheng, LIU Xiao-chun, CHEN Bai-lin
2003, 9(2): 97-105.
Abstract (154) PDF (387KB)(10)
Abstract:
Recent field survey in the eastern Dabieshan has revealed extensive occurrences of pseudotachylite. The pseudotachylite tends to occur in the NE-SW trending fracture zones or shear zones which parallel the Tan-Lu fault zone and cut all the pre-Cretaceous geological bodies. Mylonitic bands are developed in some pseudotachylites. This paper mainly discusses the origin of the pseudotachylites according to the geochemistry between the pseudotachylites and their host rocks, as well as the characteristics of the microstructures gained by optical microscope and SEM imaging.
RESEARCH ON THE EVOLUTION OF THE PALEOTEMPERATURE OF THE EASTERN SAG IN LIAOHE BASIN
Yin Xiu-lan, Wu Hong-ling, Ma Yin-sheng, Wang Xiao-feng, Wu Tie-sheng, Chen Zheng-le, Bai Jia-qi, Wang Qing-feng, Zheng Zhi-yu
2003, 9(2): 106-112.
Abstract (129) PDF (231KB)(8)
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The eastern sag is one of the three rich-hydrocarbon sags in Liaohe basin. Based on the chemical dynamic theory and digital simulation of vitrinite reflectances, the paleotemperatural evolutions of 14 wells in the eastern sag are shown, and then the geothermal gradient of every period during cenozoicera is reconstructed. That reveals the total characteristics of paleotemperatural evolution in the eastern sag. The geothermal evolution is flexuous since Tertiary, that is high paleotemperature in the early Shahejie, low in the middle-late Shahejie and high again in the Dongying stage to Neogene. To total region, the geothermal gradients (35℃~40℃) are higher in the southern and northern part than that (29℃~35℃/km) in the central part.
RESEARCH ON MOLDING, STRUCTURAL FEATURE AND FORMATION MECHANISM OF THE CENTRAL UPLIFT BELT IN DONGYING DEPRESSION,JIYANG
YUN Jin-biao, ZHAO Li-hua
2003, 9(2): 113-121.
Abstract (182) PDF (346KB)(7)
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The central uplift belt is an oil/gas enrichment zone in the Dongying depression of jiyang geotectogene.It trends nearly E-W and is a dissymmetrical anticline belt with steep dip angle in the north limb and gentle in the south.A rift-fault system of cabbage style develops on the uplift belt.Because of the characteristics of synsedimentary and reverse drag controlled by the north boundary fault.It was considered as a roll anticline belt in the early exploration time.Due to the accumulation of geological and geophysical data,most of the following investigators have argued the origin of salt-mud diapir structure since 80's.Based on detailed studying of sesimic and geological data and comparing to previous research results,a sadbox experiment is designed and carried through in this work to search the cause of the central uplift belt.By all the results above,we conclude that the Dongying central uplift belt was formed by extention-diapirism lead by regional tenso-shear stress and gravity,and the shape of the local auticlines and the character of the fault system are controlled by the shape of the salt-mud diapir and the intensity of extension and diapirism.
STUDY ON THE FRACTURE FEATURES AND SEALING PROPERTIES OF THE L451 BLOCK IN ZHUANGXI OIL FIELD,JIYANG DEPRESSION
WANG Hong-bao, MIAO Ming-cai, WU Kong-you, HONG Mei, ZHONG Jian-hua
2003, 9(2): 122-128.
Abstract (143) PDF (246KB)(8)
Abstract:
Based on the analysis of the L451 block,we know that the basement of the block is the typical structural slope-break zone located at the upward-gentle slope margin,and the cap rock overlapping on the slope of the basement shows the monoclines style.So the structure in the L451 block is simple and the faults controlled the characteristic of oil/gas.There are six faults trending in two main directions in the block,one is NNE,developed early and contemporaneously,and the other is NWW-EW,developed later.The corner-like block was formed by intersecting of the two groups of the faults.According to the analysis of geometric characteristic,the sealing properties of the faults are revealed by the several factors,such as the matching relationship between the fracture activity and the oil/gas migration stage,the extent of the continuous distribution of the mudstone-smearing zone.Then,using the fuzzy mathematics,we evaluate the sealing properties of the sandstone bodies,and the results are coinciding with the data of some wells in the oil filed.
SUB FAULTS IN COMPLEX FAULT-BLOCK OIL-FIELD AND ITS RELATION TO THE ACCUMULATION OF OIL AND GAS
WANG Li-jun, WU Yun-tong, NIU Ji-feng, GAO Fei, DING Xiao-ming
2003, 9(2): 129-135.
Abstract (239) PDF (295KB)(7)
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Based on the analysis of the regional structure,this paper mainly focus on the discuss of the distribution,characteristics,and process of the formation of the sub-fault around major fault and its controlling to the accumulation of oil and gas in complex fault-block oil-field,Taking the Xianhezhuang Oil-Field in the central syncline belts in Dongying depression as an example.The result suggests that the sub faults in the conjugated-area of explored blocks and its edges,which control the new-prospected oil bearing block, plays an important role in the reservoir increment of the old oil-explored field.
CONTROL OF STRUCTURE ON THE SEDIMENTATION IN BAIYINCHAGAN DEPRESSION,ERLIAN BASIN
ZHANG Fu-shun, FAN Tai-liang, SUN Yi-pu, KU Guo-zheng, ZHANG Fang-dong
2003, 9(2): 136-142.
Abstract (175) PDF (213KB)(6)
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There is a larger subsidence rate on the steep slope in north Baiyinchagan depression than that on the ramp in the south.Huoen area and Dongwu area,both locate on the northern abrupt slope,are sustained depocenters.Converted tectonic belts in Baiyinchagan depression are all tectonic accommodation belts. The accommodation belt In Guer area and west Sanghe area, both lie on the northern slope of the depression,are transverse and sustained, and the topography here is ever-existing palaeohigh.Both Baiyinchagan accommodation belt and east Da-1 accommodation belt on the southern slope are watershed divides.The former is the watershed divide between the braid-river delta system of Xilinhaolai and Da'erqi and the latter between the sedimentary system of Da'erqi and Wengte.Baiyinchagan depression was a fault lake basin during Aershan stage and Tenggeer stage with rapid subsidence and converted into a downwraping lake basin after Duhongmu stage.
REGIONAL DANGEROUS ON THE GEOLOGICAL HAZARDS OF COLLAPSE,LANDSLIDE AND DEBRIS FLOW IN THE UPPER REACHES OF THE YELLOW RIVER
ZHANG Chun-shan, ZHANG Ye-cheng, MA Yin-sheng
2003, 9(2): 143-153.
Abstract (164) PDF (345KB)(11)
Abstract:
Based on field work and related gological hazard data of collapse,landslide and debris flows,the dangerous assessment of the upper reaches of The Yellow River,with county as a unit,is estimated.There are 116 units in this region.Dangerous level is classified by 5 grades.There are 5 highest dangerous units.High dangerous units are 7.11 units belong to the middle dangerous area and the less and low dangerous units are 46 and 47 respectively.
APPLICATION OF PRESTRESSING FORCE ANCHORED CABLE IN THE FASTENING THE NORTHWESTERN SLOPE OF SHISANLING PUMPED STORAGE POWER STATION
WANG Xi-hai, WANG Lian-jie, GE Zeng-jun, WU Man-lu, WU Gang
2003, 9(2): 154-160.
Abstract (112) PDF (211KB)(7)
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The upper reservoir of Shisanling pumped storage power station is located at the top of Mangshan Mountain.It is used not only for sluice and electricity generating,but also a new sight sport as "sky pond" in Shisanling recreation area.Taking the anchoring of northwestern collapse-body at the upper reservoir of Shisanling pumped storage power station as an example,this paper systematically elaborate the application of prestressing anchored cable in of the prevention of geologic hazard.
VARIATION OF CONJUGATE RUPTURES AND LIMITING PRINCIPAL STRESSES WITH THE CRUSTAL DEPTHS IN THE YANYUAN-NINGLANG EARTHQUAKE
XIE Xin-sheng
2003, 9(2): 161-170.
Abstract (103) PDF (340KB)(13)
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Many examples show that earthquakes can form conjugate ruptures.The temperature and pressure at the focus are different from that of the shallow part of crust and the ground.The higher temperature and pressure,the larger conjugate rupture angles.Accompanying decrease of depth,temperature and pressure become small and the conjugate rupture angles also become small and same as the conjugate angles of isoseismic lines on the ground and the tensile-shear ruptures are near gound.Based on the method of mathmatical mechanics and the result of rock mechanic experiments,variation of the conjugate ruptures of the Yanyuan-Ninglang earthquake and its limiting principal stresses with the depth of crust is discussed.
PALYNOLOGICAL RECORDS IN XIPU SECTION,YANGYUAN
WANG Yan, WANG Shu-bing, JIANG Fu-chu, TONG Guo-bang
2003, 9(2): 171-175.
Abstract (108) PDF (169KB)(7)
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Palynological records of Xipu section reveal the local vegetational and environmental history within the last 16000aBP. A very low total Spore-pollen concentration indicates a grassland vegetation and cold~dry climate at Ca. 16000~11000aBP interval; A number of tree pollen grains found at Ca. 11000~9000aBP might be explained as a result of expansion of forests somewhere around the Xipu. This change must have caused by climatic warming and wetting in this time interval;the vegetation was dominated by sparse sylvosteppe at Ca. 9000~4800aBP, correspongding to the increasing temperature and decreasing humidity;During the last 4800aBP, the vegetation have remained as the grassland,but the decreasing concentration of the pollen might mean a reduction of forests and worsening environment around Xipu.
TIMES AND CAUSE OF FORMATION OF SAND-DUNE IN MIDDLE REACHES OF THE YANGTZE RIVER
YANG Chao, HUANG Chang-sheng, LI Chang-an, ZHAO Xin
2003, 9(2): 176-182.
Abstract (132) PDF (240KB)(8)
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By field research,data analysis and experiment data test as wall as comparing with other studys,we determined the aeolic feature of the sand-dune in the middle reaches of the Yangtze River. It is the first time in discovering the profile of Paleoburial sand-dune in Liangjiadu near Wuchang and corroborating sedimentary of sand-layer in Qingshan of Wuchang and in Yueyang of Hunan province.The time and aeolic micro-feature of sand-dune are also proofed by chronometry and scanning electron microscope.
VARIATIONAL CHARACTERISTICS OF ELEMENTS WITH TECTONIC STRESS——AN EXAMPLE FROM JIAOJIA GOLD DEPOSIT
GUO Tao, LÜ Gu-xian, DENG Jun, LI Xue-jun, SUN Zhi-fu, GUO Chu-sun
2003, 9(2): 183-190.
Abstract (134) PDF (285KB)(10)
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There are consanguineous relationship between tectonic and migration of elements during metallogenic process.Taking Jiaojia gold deposit as an example,the authors discuss the relationship between tectonic stress and metallogenic elements by studing representative geological sections.The authors suggest that tectonic role is not only to shatter and mylonitize rock,but also control the element's distribution,activation and migration.Because of the controlling role of tectonic stress,metallogenic elements show some comparability and difference in geochemical behavior under different tectonic-lithofacies belts.
2003, 9(2): 191-192.
Abstract (75) PDF (52KB)(5)
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