EXPLORATION ON STRUCTURAL CHARACTERISTICS OF THE WEIHE BASIN AND ITS EVOLUTION
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摘要: 渭河盆地是位于秦岭造山带和鄂尔多斯盆地之间的断陷盆地。渭河盆地的形成时间以及基底构成目前仍存在着争议。近几年来，对于渭河盆地天然气类型、形成机制、成藏条件、资源潜力以及盆地结构构造等方面的研究取得了很大进展，为解决以上争议提供了进一步的资料。根据盆地的钻探资料和物化探新成果，发现渭河盆地是由固市凹陷、西安凹陷、泾河鼻隆、宝鸡凸起、骊山凸起、咸阳斜坡带和富平-蒲城斜坡带组成，并具有新生代、中生代-古生代复式盖层和两盆一鼻两凸两斜坡镶嵌复合结构特征；渭河盆地新生代之下的中生代-古生代盖层为：西部宝鸡凸起为古生界地层，中部西安凹陷和咸阳斜坡带为中生代地层，东北部富平-蒲城斜坡带基底为奥陶系地层，东南部固市凹陷基底为晚古生代地层；渭河盆地与鄂尔多斯盆地具有相同的基底和相似的盖层；太要断裂（约1800 Ma）形成，为渭河盆地形成奠定了构造基础，奥陶世马家沟末加里东运动及渭北隆起南缘同生逆冲断裂形成，标志着渭河盆地独立演化的开始，主沉降期为中生代-新生代；结合已有研究，给出了渭河盆地的基底模型和渭河盆地的演化模式。Abstract: The Weihe basin is the graben basin located between the Qinling orogenic belt and the Ordos basin, and there are some controversies about the formation time and basement constitutions of the Weihe basin. In recent years, natural gas types, formation mechanism, accumulation condition, resources potentiality and basin structure in the Weihe basin have been well studied, which provides considerable evidences to resolve the controversies mentioned above. According to the drilling data and the new results of geophysical and geochemical prospecting in the Weihe basin, we found that the Weihe basin covered by Cenozoic, Mesozoic-Palaeozoic complex cap rocks, and composed of two depressions, one nose structure, two bulges and two slope belts, which respectively are Gucheng depression, Xi'an depression, Jinghe nose structural, Baoji bulge, Lishan bulge, Xianyang slope belt and Fuping-Pucheng slope belt. Baoji bulge in the west, Xi'an depression and Xianyang slope belt in the central section are covered by Paleozoic strata and Mesozoic strata, respectively. The basement of Fuping-Pucheng slope belt in the northeast and Gucheng depression in the northwest are composed of Ordovician strata and Paleozoic strata, respectively. The Weihe basin and the Ordos basin display similar basement and overlying strata. The formation of Taiyao fault (ca. 1800 Ma) provides the structural condition, and the formation of syngenetic thrust faults in Weibei uplift during Caledonian movement at the end of the Ordovician marks the beginning of independent evolution of the Weihe basin. After that, Mesozoic and Cenozoic are the main sedimentation period of the basin. Combined with previous studies, basement model and evolution model of the Weihe basin are built in this article.
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Key words:
- the Weihe basin /
- the Ordos basin /
- Weibei uplift /
- tectonic setting /
- evolution
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图 4 西安凹陷地震剖面解译图[15]
Figure 4. Interpretation of seismic profiles of depressed base in Xi'an
图 5 固市凹陷地震剖面解译图[15]
Figure 5. Interpretation of seismic profiles of depressed base in Gu city
图 7 渭河盆地结构和构造解译图[15]
Figure 7. Interpretation of the structure and tectonics of the Weihe basin
表 1 渭河盆地沉积地层特征[10]
Table 1. Characteristics of sedimentary strata in the Weihe basin
界 系 统 组 岩性描述 厚度与分布特征 成藏要素 新生界 新近系 全新统—更新统 由风积层、洪积层和冲积层交互层构成, 岩性主要为黄土, 粉砂质粘土、河流冲积砂、砾石 分布在秦岭山前及渭河盆地, 沉降中心位于户县、西安和渭南固市, 厚度一般在500~600 m之间, 最大超过1300 m, 河谷区一般大于400 m, 黄土塬区一般小于300 m 区域性盖层 张家坡组 为一套以深色泥岩为主的浅—深湖相沉积。岩性为暗色、灰绿色、浅棕红色泥岩、砂质泥岩夹薄层灰色粉细砂岩不等厚互层 分布于渭河盆地, 沉积中心分别位于户县、渭南固市, 厚度一般在700~800 m之间, 在沉积中心最厚超过1000 m 区域性盖层, 同时暗色泥岩是渭河盆地生物气源岩 上新统 蓝田组 深红色粘土、钙质结核, 棕红色砂岩和砾岩, 泥质含量变化大 分布于西安、蓝田、渭南一带, 标准剖面在蓝田县灞河西岸九龙坡, 出露厚度为64 m 灞河组 上部为黄棕色和灰绿色泥岩, 中部为紫褐色和黄棕色砂质泥岩与砂砾岩互层, 下部为浅紫褐色泥岩, 黄色砂岩, 为河湖相沉积 分布于渭河盆地东南部西安、蓝田一带, 埋深一般超过500 m, 在秦岭山前一般埋深200~400 m, 在西安凹陷埋深超过2000 m 砂岩层是伴生天然气和地热储层。是目前地热井最主要的取水层段 中新统 高陵群 为一套河、湖相沉积, 岩性主要为大段棕红色、棕紫色泥岩、砂质泥岩夹薄层灰色细砂岩 出露于秦岭山前骊山一带, 厚度几米到几百米不等, 在西安凹陷埋深最大, 埋深超过3000 m 古近系 渐新统 白鹿塬组 灰白色砂岩与紫色、棕褐色泥岩, 与含砾粗砂岩不等厚互层 出露于秦岭山前骊山和白鹿塬一带, 厚度变化大, 几米到几百米不等。在西安凹陷埋深约为4000 m 砂岩层是伴生天然气和地热储层, 埋深较大, 是部分地热井的取水层段 始新统 红河组 大套紫红色泥岩, 夹灰黄色和灰绿色砂岩、粉砂岩, 为一套河、湖相沉积 出露于秦岭山前骊山一带, 厚度约为200 m, 在凹陷区埋深超过4000 m 中生界 白垩系—侏罗系 砾岩、底砾岩, 细砂岩、粉砂岩、泥岩 出露于渭北隆起, 在渭河盆地区主要分布在咸阳斜坡带, 志丹群、直罗组是铀矿成矿层位 三叠系 含煤、油岩系、砂岩、泥页岩、泥灰岩、油页岩 出露于渭北隆起, 在渭河盆地区主要分布在固市、西安凹陷基地, 埋深较大。 油型气的主要气源岩 古生界 石炭系—二叠系 含煤岩系、泥岩、深色泥岩、砂岩、粉砂岩夹薄煤层 出露于渭北隆起, 在渭河盆地区主要分布在渭河断裂以北盆地基地, 埋深一般超过5000 m 热解气的主要气源岩 寒武系—奥陶系 碳酸盐岩、灰岩、白云岩、钙质泥岩、生物灰岩 前寒武系变质岩 前寒武系变质岩包括元古界云母石英片岩、黑云母斜长片麻岩 前寒武系变质岩包括元古界宽坪群和太古界太华群, 前者分布在宝鸡、户县、蓝田一带, 后者分布在临潼骊山等地 牧户关岩体和蓝田岩体含一定量的放射性铀, 可以作为He气源岩 燕山期花岗岩 燕山期花岗岩包括牧户关岩体和蓝田岩体等, 为二长花岗岩 牧户关岩体出露于蓝田到商县, 蓝田岩体位于蓝田县东南, 二者西段均被断层错断, 被新生界埋藏, 构成渭河盆地基底 
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[1] 王建强, 刘池洋, 高飞, 等.陕西渭河盆地前新生界地质特征及其油气意义[J].地质通报, 2015, 34(10):1981~1991. doi: 10.3969/j.issn.1671-2552.2015.10.024WANG Jianqiang, LIU Chiyang, GAO Fei, et al. Pre-Cenozoic geological characteristics and oil-gas significance in Weihe basin, Shaanxi Province[J]. Geological Bulletin of China, 2015, 34(10):1981~1991. (in Chinese with English abstract) doi: 10.3969/j.issn.1671-2552.2015.10.024 [2] 权新昌.渭河盆地断裂构造研究[J].中国煤田地质, 2005, 17(3):1~4, 8. http://www.wenkuxiazai.com/doc/5bfb52868762caaedd33d471.htmlQUAN Xinchang. Weihe Basin faulted structure study[J]. Coal Geology of China, 2005, 17(3):1~4, 8. (in Chinese with English abstract) http://www.wenkuxiazai.com/doc/5bfb52868762caaedd33d471.html [3] 李玉宏, 卢进才, 李金超, 等.渭河盆地天然气成因特征及其意义[J].西安石油大学学报(自然科学版), 2011, 26(5):11~16. https://www.cnki.com.cn/qikan-XASY201105005.htmlLI Yuhong, LU Jincai, LI Jinchao, et al. Genetic characteristics of the natural gas in Weihe Basin and its significance[J]. Journal of Xi'an Shiyou University (Natural Science Edition), 2011, 26(5):11~16. (in Chinese with English abstract) https://www.cnki.com.cn/qikan-XASY201105005.html [4] 王斌, 郑洪波, 王平, 等.渭河盆地新生代地层与沉积演化研究:现状和问题[J].地球科学进展, 2013, 28(10):1126~1135. doi: 10.11867/j.issn.1001-8166.2013.10.1126WANG Bin, ZHENG Hongbo, WANG Ping, et al. The Cenozoic strata and depositional evolution of Weihe Basin:progresses and problems[J]. Advances in Earth Science, 2013, 28(10):1126~1135. (in Chinese with English abstract) doi: 10.11867/j.issn.1001-8166.2013.10.1126 [5] 刘志武, 周立发.渭河盆地新生代构造-沉积格局与油气成藏潜力初探[J].福州大学学报(自然科学版), 2015, 43(5):708~714. doi: 10.7631/issn.1000-2243.2015.05.0708LIU Zhiwu, ZHOU Lifa. The Cenozoic tectonic and sedimentary framework and preliminary study on the hydrocarbon accumulation potential of the Weihe basin[J]. Journal of Fuzhou University (Natural Science Edition), 2015, 43(5):708~714. (in Chinese with English abstract) doi: 10.7631/issn.1000-2243.2015.05.0708 [6] 肖晖, 李建新, 韩伟, 等.鄂尔多斯盆地南缘渭北隆起中新生代构造抬升及演化[J].西安科技大学学报, 2013, 33(5):576~582, 593. http://www.doc88.com/p-6022038960112.htmlXIAO Hui, LI Jianxin, HAN Wei, et al. The tectonic uplift time and evolution characteristics of Weibei uplift in the south edge of Ordos Basin[J]. Journal of Xi'an University of Science and Technology, 2013, 33(5):576~582, 593. (in Chinese with English abstract) http://www.doc88.com/p-6022038960112.html [7] 王建强, 刘池洋, 闫建萍, 等.鄂尔多斯盆地南部渭北隆起发育时限及其演化[J].兰州大学学报(自然科学版), 2010, 46(4):22~29. http://www.doc88.com/p-1844501084418.htmlWANG Jianqiang, LIU Chiyang, YAN Jianping, et al. Development time and evolution characteristics of Weibei uplift in the south of Ordos Basin[J]. Journal of Lanzhou University (Natural Sciences), 2010, 46(4):22~29. (in Chinese with English abstract) http://www.doc88.com/p-1844501084418.html [8] 任军锋. 北秦岭(陕西段)古生代构造体制转换研究[D]. 西安: 西北大学, 2004.REN Junfeng. Paleozic tectonic transformation of the North Qinling belt in Shanxi Province[D]. Xi'an: Northwest University, 2004. (in Chinese with English abstract) [9] 董云鹏, 张国伟, 朱炳泉.北秦岭构造属性与元古代构造演化[J].地球学报, 2003, 24(1):3~10. https://www.wenkuxiazai.com/doc/aeee905bbe23482fb4da4c32.htmlDONG Yunpeng, ZHANG Guowei, ZHU Bingquan. Proterozoic tectonics and evolutionary history of the North Qinling Terrane[J]. Acta Geoscientia Sinica, 2003, 24(1):3~10. (in Chinese with English abstract) https://www.wenkuxiazai.com/doc/aeee905bbe23482fb4da4c32.html [10] 李荣西, 刘建朝, 魏刚峰, 等.渭河盆地地热水水溶烃类天然气成因与来源研究[J].天然气地球科学, 2009, 20(5):774~780. http://d.old.wanfangdata.com.cn/Periodical/trqdqkx200905022LI Rongxi, LIU Jianchao, WEI Gangfeng, et al. Origin and source of dissolved hydrocarbon gas in geothermal water, Weihe Basin[J]. Natural Gas Geoscience, 2009, 20(5):774~780. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/trqdqkx200905022 [11] 李钰, 符彩云.渭河盆地上新统沉积相研究[J].地下水, 2015, 37(1):185~187. http://d.old.wanfangdata.com.cn/Periodical/dixs201501074LI Yu, FU Caiyun. Study on Miocene sedimentary facies of the Weihe River Basin[J]. Ground Water, 2015, 37(1):185~187. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/dixs201501074 [12] 刘志武, 白勇, 周立发.渭河盆地结构及其油气成藏地质条件[J].石油实验地质, 2016, 38(5):584~591. doi: 10.11781/sysydz201605584LIU Zhiwu, BAI Yong, ZHOU Lifa. Basin Structure and Hydrocarbon accumulation conditions of the Weihe Basin[J].Petroleum Geology & Experiment, 2016, 38(5):584~591. (in Chinese with English abstract) doi: 10.11781/sysydz201605584 [13] 李钰. 渭河盆地地热井伴生气地球化学特征及生物气资源量评价[D]. 西安: 长安大学, 2015.LI Yu. The geochemical characteristics of source rock and source rock potential evaluation of the Weihe Basin[D]. Xi'an: Chang'an University, 2015. (in Chinese with English abstract) [14] 陕西省地质矿产局.陕西省区域地质志[M].北京:地质出版社, 1989. http://d.old.wanfangdata.com.cn/Periodical/zhyfyx201608011Shaanxi Bureau of Geology and Mineral Resources. Regional geology of Shaanxi Province[M]. Beijing:Geological Publishing House, 1989. (in Chinese) http://d.old.wanfangdata.com.cn/Periodical/zhyfyx201608011 [15] 刘林, 芮会超, 陈宝赟.渭河盆地天然气类型、成因特征及找矿远景分析[J].地质力学学报, 2016, 22(2):256~268. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?file_no=20160207&flag=1LIU Lin, RUI Huichao, CHEN Baoyun. The characteristics and types of the natural gas in the Weihe Basin and its prospecting potential[J]. Journal of Geomechanics, 2016, 22(2):256~268. (in Chinese with English abstract) http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?file_no=20160207&flag=1 [16] 李俊建, 罗镇宽, 燕长海, 等.华北陆块的构造格局及其演化[J].地质找矿论丛, 2011, 25(2):89~100. https://www.wenkuxiazai.com/doc/f06c7ae16294dd88d0d26bcf.htmlLI Junjian, LUO Zhenkuan, YAN Changhai, et al. Structure framework and evolution of the North China Craton[J]. Contributions to Geology and Mineral Resources Research, 2011, 25(2):89~100. (in Chinese with English abstract) https://www.wenkuxiazai.com/doc/f06c7ae16294dd88d0d26bcf.html [17] 黎世美, 瞿兰全, 苏振邦, 等.小秦岭金矿地质和成矿预测[M].北京:地质出版社, 1996.LI Shimei, QU Lanquan, SU Zhenbang, et al. Geology of gold deposits and metallogenic prediction in Xiaoqinling Area[M]. Beijing:Geological Publishing House, 1996. (in Chinese) [18] Maruyama S, Send T. Orogeny and relative plate motions:example of the Japanese Islands[J]. Tectonophysics, 1986, 127(3~4):305~329. doi: 10.1016/0040-1951(86)90067-3 [19] 吴奇, 许立青, 李三忠, 等.华北地块中部活动构造特征及汾渭地堑成因探讨[J].地学前缘, 2013, 20(4):104~114. http://d.old.wanfangdata.com.cn/Periodical/dxqy201304008WU Qi, XU Liqing, LI Sanzhong, et al. Active tectonics in the Central North China Block and the cause of the formation of the Fenwei Graben[J]. Earth Science Frontiers, 2013, 20(4):104~114. (in Chinese with English abstract) http://d.old.wanfangdata.com.cn/Periodical/dxqy201304008 -
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