Geological characteristics and reservoir-forming potential of shale gas of transitional facies in Linxing area, eastern margin of Ordos Basin

Authors

WU Peng, China United Coalbed Methane Company Limited, Beijing 100011, China
CAO Di, CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China; Key Laboratory for Exploration & Development of Unconventional Resources, CNOOC Energy Technology & Services CO., Ltd., Tianjin 300452, ChinaFollow
ZHU Guanghui, China United Coalbed Methane Company Limited, Beijing 100011, China
LIU Xueqing, CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China; Key Laboratory for Exploration & Development of Unconventional Resources, CNOOC Energy Technology & Services CO., Ltd., Tianjin 300452, China
LI Yong, School of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
LI Yangbing, CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China; Key Laboratory for Exploration & Development of Unconventional Resources, CNOOC Energy Technology & Services CO., Ltd., Tianjin 300452, China
HU Weiqiang, CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China; Key Laboratory for Exploration & Development of Unconventional Resources, CNOOC Energy Technology & Services CO., Ltd., Tianjin 300452, China
LIU Zaizhen, CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China; Key Laboratory for Exploration & Development of Unconventional Resources, CNOOC Energy Technology & Services CO., Ltd., Tianjin 300452, China
KONG Wei, CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China
FEI Jingliang, CNOOC Energy Tech-Drilling & Production Co., Tianjin 300452, China; Key Laboratory for Exploration & Development of Unconventional Resources, CNOOC Energy Technology & Services CO., Ltd., Tianjin 300452, China

Abstract

Shale gas of transitional facies is the important replacing area for increase of shale gas reserves and production. On the basis of the experiment and research data of shale of transitional facies of Linxing area in the eastern margin of Ordos Basin, by selecting the strata series of Shanxi Formation, Taiyuan Formation and Benxi Formation as the research object, from the sedimentary environments, shale distribution, organic geochemical characteristics, mineralogy, physical characteristics and gas-bearing characteristics, etc., the geology characteristics of the shale gas transitional facies in the study area were summarized and dissected systematically to analyze its enrichment and reservoir-forming potential. During the Late Carboniferous to the Early Permian, the Ordos Basin was affected by the active tectonic activities in the region, and the water environment changed frequently, resulting in the formation of multiple sedimentary cycles of littoral shallow sea, delta front and littoral shallow lake assemblages, and many sets of organic-rich shales of marine-continental transition facies were deposited. The study area is located in the north-central area of the western Shanxi flexural belt in the eastern part of the Ordos Basin, where the sedimentary environments are stable and organic-rich transitional shale is widely distributed. The rock characteristics of the shale are mainly interbedded gray-light gray fine-grained sandstone and dark mudstone, and the accumulated vertical thickness of the shale is big(60-180 m). The organic matter types of the organic-rich transitional shale in the study area are Ⅱ₂-Ⅲ type kerogen, and the total organic matter carbon content is high, with TOC 3.07% which is in the mature gas generation stage. The mineral composition of the shale is mainly quartz and clay, and the content of feldspar and carbonate minerals is low. Macroscopically, the main types of pores are inorganic pores and organic pores, and the fractures are not developed. Microscopically, the pores are controlled by clay minerals, and the pore morphology is mostly open slit micropores and mesopores. The shale of the transitional facies in the study area has the physical characteristics of low porosity and low permeability, but has good gas-bearing characteristics, the average gas content is 1.15 m³/t. The comprehensive analysis of the shales' characteristics shows that the shale gas in the study area has great potential, providing a theoretical basis for the exploration and development of shale gas in the later stage of the area.

Keywords

Late Carboniferous-Early Permian, shale gas, transitional facies, Ordos Basin, resource potential

DOI

10.3969/j.issn.1001-1986.2021.06.003

Recommended Citation

WU Peng, CAO Di, ZHU Guanghui, et al. (2021) "Geological characteristics and reservoir-forming potential of shale gas of transitional facies in Linxing area, eastern margin of Ordos Basin," Coal Geology & Exploration: Vol. 49: Iss. 6, Article 4.
DOI: 10.3969/j.issn.1001-1986.2021.06.003
Available at: https://cge.researchcommons.org/journal/vol49/iss6/4

Reference

[1] GUO Xusheng, HU Dongfeng, LIU Ruobing, et al. Geological conditions and exploration potential of Permian marine-continent transitional facies shale gas in the Sichuan Basin[J]. Natural Gas Industry, 2018, 38(10): 11-18. 郭旭升, 胡东风, 刘若冰, 等. 四川盆地二叠系海陆过渡相页岩气地质条件及勘探潜力[J]. 天然气工业, 2018, 38(10): 11-18.

[2] DONG Dazhong, WANG Yuman, LI Xinjing, et al. Breakthrough and prospect of shale gas exploration and development in China[J]. Natural Gas Industry, 2016, 36(1): 19-32. 董大忠, 王玉满, 李新景, 等. 中国页岩气勘探开发新突破及发展前景思考[J]. 天然气工业, 2016, 36(1): 19-32.

[3] ZOU Caineng, DONG Dazhong, WANG Yuman, et al. Shale gas in China: Characteristics, challenges and prospects(Ⅱ)[J]. Petroleum Exploration and Development, 2016, 43(2): 166-178. 邹才能, 董大忠, 王玉满, 等. 中国页岩气特征、挑战及前景(二)[J]. 石油勘探与开发, 2016, 43(2): 166-178.

[4] ZOU Caineng, DONG Dazhong, WANG Shejiao, et al. Geological characteristics, formation mechanism and resource potential of shale gas in China[J]. Petroleum Exploration and Development, 2010, 37(6): 641-653. 邹才能, 董大忠, 王社教, 等. 中国页岩气形成机理、地质特征及资源潜力[J]. 石油勘探与开发, 2010, 37(6): 641-653.

[5] LI Yong, WANG Yanbin, NI Xiaoming, et al. Study on identification and control system construction of low efficiency coalbed methane wells[J]. Coal Science and Technology, 2020, 48(2): 185-193. 李勇, 王延斌, 倪小明, 等. 煤层气低效井成因判识及治理体系构建研究[J]. 煤炭科学技术, 2020, 48(2): 185-193.

[6] CHEN Xinjun, BAO Shujing, HOU Dujie, et al. Methods and key parameters of shale gas resources evaluation[J]. Petroleum Exploration and Development, 2012, 39(5): 566-571. 陈新军, 包书景, 侯读杰, 等. 页岩气资源评价方法与关键参数探讨[J]. 石油勘探与开发, 2012, 39(5): 566-571.

[7] LI Yong, YANG Jianghao, PAN Zhejun, et al. Unconventional natural gas accumulations in stacked deposits: A discussion of Upper Paleozoic coal-bearing strata in the east margin of the Ordos Basin, China[J]. Acta Geologica Sinica(English Edition), 2019, 93(1): 111-129.

[8] CHEN Shiyue, ZHANG Shun, WANG Yongshi, et al. Lithofacies types and reservoirs of Paleogene fine-grained sedimentary rocks in Dongying Sag, Bohai Bay Basin[J]. Petroleum Exploration and Development, 2016, 43(2): 198-208. 陈世悦, 张顺, 王永诗, 等. 渤海湾盆地东营凹陷古近系细粒沉积岩岩相类型及储集层特征[J]. 石油勘探与开发, 2016, 43(2): 198-208.

[9] LI Yong, WANG Zhuangsen, PAN Zhejun, et al. Pore structure and its fractal dimensions of transitional shale: A cross-section from east margin of the Ordos Basin, China[J]. Fuel, 2019, 241: 417-431.

[10] LI Yong, WANG Zhuangsen, GAN Quan, et al. Paleoenvironmental conditions and organic matter accumulation in Upper Paleozoic organic-rich rocks in the east margin of the Ordos Basin, China[J]. Fuel, 2019, 252: 172-187.

[11] XUE Chunqi, WU Jianguang, ZHONG Jianhua, et al. Characteristics of the marine-terrigenous interdepositional shale: A case study of Taiyuan Formation in Linxing area of Ordos Basin[J]. Journal of China University of Mining & Technology, 2019, 48(4): 870-881. 薛纯琦, 吴建光, 钟建华, 等. 海陆交互相沉积泥页岩发育特征研究: 以鄂尔多斯盆地临兴地区太原组为例[J]. 中国矿业大学学报, 2019, 48(4): 870-881.

[12] XUE Chunqi, WU Jianguang, ZHONG Jianhua, et al. Characteristics of reservoir variability of transitional and continental shale, Shanxi Formation, Linxing and Shenfu area, northeastern Ordos Basin[J]. Journal of Central South University(Science Technology), 2020, 51(4): 998-1011. 薛纯琦, 吴建光, 钟建华, 等. 海陆交互相与陆相页岩储层差异性特征: 以鄂尔多斯盆地东北部临兴-神府工区山西组为例[J]. 中南大学学报(自然科学版), 2020, 51(4): 998-1011.

[13] WU Chenjun, ZHANG Mingfeng, LIU Yan, et al. Geochemical characteristics of Paleozoic shale in Sichuan Basin and their gas content features[J]. Journal of China Coal Society, 2013, 38(5): 794-799. 吴陈君, 张明峰, 刘艳, 等. 四川盆地古生界泥页岩的地球化学特征[J]. 煤炭学报, 2013, 38(5): 794-799.

[14] GAO Bo. Geochemical characteristics of shale gas from Lower Silurian Longmaxi Formation in the Sichuan Basin and its geological significance[J]. Natural Gas Geoscience, 2015, 26(6): 1173-1182. 高波. 四川盆地龙马溪组页岩气地球化学特征及其地质意义[J]. 天然气地球科学, 2015, 26(6): 1173-1182.

[15] CAO Chunhui, ZHANG Mingjie, TANG Qingyan, et al. Geochemical characteristics and implications of shale gas in Longmaxi Formation, Sichuan Basin, China[J]. Natural Gas Geoscience, 2015, 26(8): 1604-1612. 曹春辉, 张铭杰, 汤庆艳, 等. 四川盆地志留系龙马溪组页岩气气体地球化学特征及意义[J]. 天然气地球科学, 2015, 26(8): 1604-1612.

[16] WANG Shengxiu, JIAO Weiwei, FANG Guangjian, et al. Geochemical features and genesis of shale gas of Wufeng-Longmaxi Formation in southeastern Chongqing[J]. Marine Origin Petroleum Geology, 2017, 22(4): 77-84. 汪生秀, 焦伟伟, 方光建, 等. 渝东南地区五峰组-龙马溪组页岩气地球化学特征及其成因分析[J]. 海相油气地质, 2017, 22(4): 77-84.

[17] HAN Hui, ZHONG Ningning, CHEN Cong, et al. The gas potential of Jurassic continental shale in the middle-small basins, northwest China[J]. Chinese Science Bulletin, 2014, 59(9): 809-815. 韩辉, 钟宁宁, 陈聪, 等. 西北地区中小型盆地侏罗系陆相泥页岩的含气性[J]. 科学通报, 2014, 59: 809-815.

[18] XU Hongwei, LI Xianqing, ZHOU Baogang, et al. Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area[J]. Journal of Mining Science and Technology, 2017, 2(2): 99-108. 徐红卫, 李贤庆, 周宝刚, 等. 延长探区延长组陆相页岩气地球化学特征和成因[J]. 矿业科学学报, 2017, 2(2): 99-108.

[19] LI Yong, WANG Yanbin, MENG Shangzhi, et al. Theoretical basis and prospect of coal measure unconventional natural gas coproduction[J]. Journal of China Coal Society, 2020, 45(4): 1406-1418. 李勇, 王延斌, 孟尚志, 等. 煤系非常规天然气合采地质基础理论进展及展望[J]. 煤炭学报, 2020, 45(4): 1406-1418.

[20] LIANG Qingshao, ZHANG Xiang, TIAN Jingchun, et al. Geological and geochemical characteristics of transitional shale from the Lower Permian Taiyuan Formation, Taikang Uplift, southern North China Basin[J]. Marine and Petroleum Geology, 2018, 98: 229-242.

[21] LUO Wen, HOU Mingcai, LIU Xinchun, et al. Geological and geochemical characteristics of transitional shale from the Upper Permian Longtan Formation, northwestern Guizhou, China[J]. Marine and Petroleum Geology, 2018, 89: 58-67.

[22] LIU Shunxi, WU Caifang, LI Teng, et al. Multiple geochemical proxies controlling the organic matter accumulation of the marine-continental transitional shale: A case study of the Upper Permian Longtan Formation, western Guizhou, China[J]. Journal of Natural Gas Science and Engineering, 2018, 56: 152-165.

[23] XIAO Dianshi, LU Shuangfang, FANG Dazhi, et al. Pore connectivity of marine high-maturity shale gas reservoirs: A case study in Longmaxi Formation, Pengshui area[J]. Reservoir Evaluation and Development, 2019, 9(5): 45-53. 肖佃师, 卢双舫, 房大志, 等. 海相高成熟页岩气储层孔隙连通关系: 以彭水地区龙马溪组为例[J]. 油气藏评价与开发, 2019, 9(5): 45-53.

[24] KUANG Lichun, DONG Dazhong, HE Wenyuan, et al. Geological characteristics and development potential of transitional shale gas in the east margin of the Ordos Basin, NW China[J]. Petroleum Exploration and Development, 2020, 47(3): 435-446. 匡立春, 董大忠, 何文渊, 等. 鄂尔多斯盆地东缘海陆过渡相页岩气地质特征及勘探开发前景[J]. 石油勘探与开发, 2020, 47(3): 435-446.

[25] HU Weiqiang, ZHAO Jingzhou, LI Jun, et al. Characteristics of source rocks and its controls on the formation and distribution of gas from Upper Paleozoic in southwest Ordos Basin[J]. Natural Gas Geoscience, 2015, 26(6): 1068-1075. 胡维强, 赵靖舟, 李军, 等. 鄂尔多斯盆地西南部上古生界烃源岩特征及其对天然气藏形成与分布的控制作用[J]. 天然气地球科学, 2015, 26(6): 1068-1075.

[26] FAN Wentian, HU Guohua, WANG Tao. Quantitative characterization of pore structure of marine-continental transitional facies shale in the eastern margin of Ordos Basin[J]. China Sciencepaper, 2019, 14(4): 429-434. 范文田, 胡国华, 王涛. 鄂尔多斯盆地东缘海陆过渡相页岩孔隙结构定量化表征[J]. 中国科技论文, 2019, 14(4): 429-434.

[27] YAO Jingli, HU Xinyou, FAN Liyong, et al. The geological conditions, resource potential and exploration direction of natural gas in Ordos Basin[J]. Natural Gas Geoscience, 2018, 29(10): 1465-1474. 姚泾利, 胡新友, 范立勇, 等. 鄂尔多斯盆地天然气地质条件资源潜力及勘探方向[J]. 天然气地球科学, 2018, 29(10): 1465-1474.

[28] XI Zhaodong, TIAN Zhongbin, TANG Shuheng. Characteristics and main controlling factors of shale gas reservoirs in transitional facies on the eastern margin of Ordos Basin[J]. Geology in China, 2016, 43(6): 2059-2069. 郗兆栋, 田忠斌, 唐书恒. 鄂尔多斯盆地东缘海陆过渡相页岩气储层孔隙特征及影响因素[J]. 中国地质, 2016, 43(6): 2059-2069.

[29] YANG Junjie. Tectonic evolution and oil-gas reservoirs distribution in Ordos Basin[M]. Beijing: Petroleum Industry Press, 2002. 杨俊杰. 鄂尔多斯盆地构造演化与油气分布规律[M]. 北京: 石油工业出版社, 2002.

[30] HU Weiqiang, LI Yangbing, CHEN Xin, et al. Origin and source of natural gas in the Upper Paleozoic in Linxing area, Ordos Basin[J]. Natural Gas Geoscience, 2020, 31(1): 26-36. 胡维强, 李洋冰, 陈鑫, 等. 鄂尔多斯盆地临兴地区上古生界天然气成因及来源[J]. 天然气地球科学, 2020, 31(1): 26-36.

[31] ZHENG Dingye, JIANG Fujie, LIU Tieshu, et al. Genetic types and sources of natural gas in Linxing area, the eastern margin of Ordos Basin, China[J]. Journal of Earth Sciences and Environment, 2018, 40(2): 203-214. 郑定业, 姜福杰, 刘铁树, 等. 鄂尔多斯盆地东缘临兴地区天然气成因类型及气源分析[J]. 地球科学与环境学报, 2018, 40(2): 203-214.

[32] XIE Yinggang, MENG Shangzhi, WAN Huan, et al. Analysis on geological conditions of multi type natural gas reservoir in coal measure strata of Linxing area[J]. Coal Science and Technology, 2015, 43(9): 71-75. 谢英刚, 孟尚志, 万欢, 等. 临兴地区煤系地层多类型天然气储层地质条件分析[J]. 煤炭科学技术, 2015, 43(9): 71-75.

[33] XIE Yinggang, MENG Shangzhi, GAO Lijun, et al. Assessments on potential resources of deep coalbed methane and compact sandstone gas in Linxing area[J]. Coal Science and Technology, 2015, 43(2): 21-24. 谢英刚, 孟尚志, 高丽军, 等. 临兴地区深部煤层气及致密砂岩气资源潜力评价[J]. 煤炭科学技术, 2015, 43(2): 21-24.

[34] WU Peng, GAO Jixian, GUO Junchao, et al. Sequence stratigraphy and sedimentary characteristic analysis of Qiaotou sandstone of Taiyuan Formation in Linxing area, eastern margin of Ordos Basin[J]. Oil & Gas Geology, 2018, 39(1): 66-76. 吴鹏, 高计县, 郭俊超, 等. 鄂尔多斯盆地东缘临兴地区太原组桥头砂岩层序地层及沉积特征[J]. 石油与天然气地质, 2018, 39(1): 66-76.

[35] ZHAO Junbin, TANG Shuheng, SUN Zhenfei, et al. Shanxi Formation high-resolution sequence stratigraphy and coal accumulation pattern in Xingxian area, Ordos Basin eastern margin[J]. Coal Geology of China, 2015, 27(4): 1-7. 赵俊斌, 唐书恒, 孙振飞, 等. 鄂尔多斯盆地东缘兴县地区山西组高分辨率层序地层与聚煤规律[J]. 中国煤炭地质, 2015, 27(4): 1-7.

[36] SHI Jing, HUANG Wenhui, LYU Chenhang, et al. Geochemical characteristics and geological significance of the Upper Paleozoic mudstones from Linxing area in Ordos Basin[J]. Acta Petrolei Sinica, 2018, 39(8): 876-889. 师晶, 黄文辉, 吕晨航, 等. 鄂尔多斯盆地临兴地区上古生界泥岩地球化学特征及地质意义[J]. 石油学报, 2018, 39(8): 876-889.

[37] HU Weiqiang, LIU Yuming, LI Yangbing, et al. The characteristics and generation-expulsion history of hydrocarbon source rocks of the Upper Paleozoic in Linxing area of Ordos Basin[J]. Journal of Yangtze University(Natural Science Edition), 2018, 15(19): 1-5. 胡维强, 刘玉明, 李洋冰, 等. 鄂尔多斯盆地临兴地区上古生界烃源岩特征及其生排烃史研究[J]. 长江大学学报(自科版), 2018, 15(19): 1-5.

[38] LIN Junfeng, HU Haiyan, LI Qi. Geochemical characteristics and implications of shale gas in Jiaoshiba, eastern Sichuan, China[J]. Earth Science, 2017, 42(7): 1124-1133. 林俊峰, 胡海燕, 黎祺. 川东焦石坝地区页岩气特征及其意义[J]. 地球科学, 2017, 42(7): 1124-1133.

[39] ZHAO Lei, HE Yongzhong, YANG Ping, et al. Characteristics of Lower Palaeozoic hydrocarbon source strata and a primary study of the shale gas accumulation in northern Guizhou Province[J]. Geology in China, 2015, 42(6): 1931-1943. 赵磊, 贺永忠, 杨平, 等. 黔北下古生界烃源层系特征与页岩气成藏初探[J]. 中国地质, 2015, 42(6): 1931-1943.

[40] WEI Xiangfeng, GUO Tonglou, LIU Ruobing. Geochemical features of shale gas and their genesis in Jiaoshiba block of Fuling shale gasfield, Chongqing[J]. Natural Gas Geoscience, 2016, 27(3): 539-548. 魏祥峰, 郭彤楼, 刘若冰. 涪陵页岩气田焦石坝地区页岩气地球化学特征及成因[J]. 天然气地球科学, 2016, 27(3): 539-548.

[41] JIANG Chengfu, WANG Xiangzeng, ZHANG Lixia, et al. Geological characteristics of shale and exploration potential of continental shale gas in 7th member of Yanchang Formation, southeast Ordos Basin[J]. Geology in China, 2013, 40(6): 1880-1888. 姜呈馥, 王香增, 张丽霞, 等. 鄂尔多斯盆地东南部延长组长7段陆相页岩气地质特征及勘探潜力评价[J]. 中国地质, 2013, 40(6): 1880-1888.

[42] LIU Quanyou, JIN Zhijun, MENG Qingqiang, et al. Genetic types of natural gas and filling patterns in Daniudi gas field, Ordos Basin, China[J]. Journal of Asian Earth Sciences, 2015, 107: 1-11.

[43] SONG Wenhui, LIU Lei, SUN Hai, et al. Pore structure characterization and flow ability of shale oil reservoir based on digital cores[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(4): 497-505. 宋文辉, 刘磊, 孙海, 等. 基于数字岩心的页岩油储层孔隙结构表征与流动能力研究[J]. 油气藏评价与开发, 2021, 11(4): 497-505.

[44] LI Huabing, YAO Zheng, LI Ning, et al. Occurrence characteristics and resource potential evaluation of tar-rich coal for No. 5-2 coal seam in Shenfu mining area[J]. Coal Geology & Exploration, 2021, 49(3): 26-32. 李华兵, 姚征, 李宁, 等. 神府矿区5-2煤层富油煤赋存特征及资源潜力评价[J]. 煤田地质与勘探, 2021, 49(3): 26-32.

[45] YANG Yanqing, ZHANG Xiaodong, XU Yakun, et al. The characteristics of organic matter in coal-measure source rocks and coal-measure gas resource potential in eastern Henan Province[J]. Coal Geology & Exploration, 2019, 47(2): 111-120. 杨燕青, 张小东, 许亚坤, 等. 豫东地区煤系烃源岩有机质特征与煤系气资源潜力[J]. 煤田地质与勘探, 2019, 47(2): 111-120.