Gas accumulation conditions and resource potential in coal measure strata of the Permian Shanxi Formation in the eastern Ordos Basin

doi:10.3969/j.issn.1672-7703.2021.06.008

Abstract

Abstract: The coal measure gas resources are abundant of the Permian Shanxi Formation of the Upper Paleozoic in Ordos Basin. Therefore, it is of great signifi cance to analyze the gas accumulation conditions in coal measure strata and predict the gas resource potential, so as to deepen the exploration of unconventional gas in Ordos Basin. By taking Shanxi Formation as the study object, the geological and geochemical characteristics of source rocks and the mineral composition, pore structure, physical properties of reservoirs are studied in details in this study based on core observation and stratigraphic characteristics in single well, as well as a series of lab test results such as SEM, XRD analysis and gas adsorption experiments. Then the gas accumulation conditions of coal measure strata are analyzed and the gas resource potential is predicted. The results show that: (1) The source rocks of Shanxi Formation are characterized by relatively thin thickness of a single layer,multiple layers, thick in the east and thin in the west, high TOC, organic matter types of Type Ⅱ2 and Ⅲ, high mature to over mature with R o ranging from 1.2%-2.6%, and great gas generation potential; (2) The sandstone reservoir of Shanxi Formation is mainly composed of lithic quartz sandstone and lithic sandstone, and the reservoir space is dominated by dissolution pores of lithiclast with the porosity of 2%-10%; The mineral composition of mudstone is mainly quartz and clay mineral, and the reservoir space types include organic pores and micro fractures,with complex pore throat structure; (3) The estimated gas resource of Shanxi Formation is about 306879.79×108m3 by using the Monte-Carlomethod, among which the 2nd member of Shanxi Formation has large gas resource potential of 177001.15×108m3.

CLC Number:

TE112

Zhang Chunlin, Zhang Jiaqi, Song Zezhang, Jiang Fujie, Fan Liyong, Pei Yu. Gas accumulation conditions and resource potential in coal measure strata of the Permian Shanxi Formation in the eastern Ordos Basin[J]. China Petroleum Exploration, 2021, 26(6): 110-124.

References

[1] 张培河，刘云亮，贾立龙，等．鄂尔多斯盆地东部上古生界煤系页岩气藏特征及勘探方向[J]. 煤田地质与勘探,2016,44(4):54-58. Zhang Peihe, Liu Yunliang, Jia Lilong, et al . Shale gas reservior characteristics of the Upper Paleozoic coal measures and exploration direction in eastern Ordos Basin[J]. Coal Geology & Exploration, 2016,44(4):54-58.
[2] 赵文智，贾爱林，位云生，等．中国页岩气勘探开发进展及发展展望[J]. 中国石油勘探，2020,25(1):31-44. Zhao Wenzhi, Jia Ailin, Wei Yunsheng, et al . Progress in shale gas exploration in China and Prospects for future development[J]. China Petroleum Exploration, 2020,25(1):31-44.
[3] 唐红君，黄金亮，潘松圻，等．我国天然气探明未开发储量评价及发展对策建议[J]. 石油科技论坛，2020,39(6):37-44. Tang Hongjun, Huang Jinliang, Pan Songqi, et al . Suggestions on assessment and development of China’s proven but undeveloped natural gas reserves[J]. Petroleum Science and Technology Forum, 2020,39(6):37-44.
[4] 付金华，范立勇，刘新社，等．鄂尔多斯盆地天然气勘探新进展、前景展望和对策措施[J]. 中国石油勘探，2019,24(4):418-430. Fu Jinhua, Fan Liyong, Liu Xinshe, et al . New progresses, prospects and countermeasures of natural gas exploration in the Ordos Basin[J].China Petroleum Exploration, 2019,24(4):418-430.
[5] 许坤，郑冬冬，林爽. 促进中国油气勘探开发对策探讨[J]. 石油科技论坛，2019,38(6):6-14. Xu Ku n , Zheng Dongdong, Lin Shuang. Discussion of countermeasures for promotion of China’s oil and gas exploration and Development[J]. Oil Forum, 2019,38(6):6-14.
[6] 李国欣，朱如凯．中国石油非常规油气发展现状、挑战与关注问题[J]. 中国石油勘探，2020,25(2):1-13. Li Guoxin, Zhu Rukai. Progress, challenges and key issues in the unconventional oil and gas development of CNPC[J]. China Petroleum Exploration, 2020,25(2):1-13.
[7] 邹才能，杨智，黄士鹏，等．煤系天然气的资源类型、形成分布与发展前景[J]. 石油勘探与开发，2019,46(3):433-442. Zou Caineng, Yang Zhi, Huang Shipeng，et al . Resource types, formation, distribution and prospects of coal-measure gas[J]. Petroleum Exploration and Development, 2019,46(3):433-442.
[8] Jiang Fujie, Chen Di, Wang Zhifang, et al . Pore characteristic analysis of a lacustrine shale:a case study in the Ordos Basin, NW China[J]. Marine and Petroleum Geology, 2016,73:554-571.
[9] Wang F Y, Yang K, Yun Z. Multifractal characteristics of shale and tight sandstone pore structures with nitrogen adsorption and nuclear magnetic resonance[J]. Petroleum Science, 2020,17(5):1209-1220.
[10] 姚海鹏．鄂尔多斯盆地北部晚古生代煤系非常规天然气耦合成藏机理研究[D]. 北京：中国矿业大学，2017:12-15. Yao Haipeng. Study on the accumulation mechanism of the unconventional natural gas in late Paleozoic coal bearing strata of the northern part of the Ordos Basin[D]. Beijing：China University of Mining and Technology, 2017:12-15.
[11] 欧阳永林，田文广，孙斌，等．中国煤系气成藏特征及勘探对策[J]. 天然气工业，2018,38(3):15-23. Ouyang Yonglin, Tian Wenguang, Sun Bin，et al . Characteristics of coal measure gas accumulation and such gas exploration strategies in China[J]. Natural Gas Industry, 2018,38(3):15-23.
[12] 曹代勇，刘亢，刘金城，等．鄂尔多斯盆地西缘煤系非常规气共生组合特征[J]. 煤炭学报，2016,41(2):277-285. Cao Daiyong, Liu Kang, Liu Jincheng, et al . Combination characteristics of unconventional gas in coal measure in the west margin of Ordos Basin[J]. Journal of China Coal Society, 2016,41(2):277-285.
[13] 赵振宇，郭彦如，王艳，等．鄂尔多斯盆地构造演化及古地理特征研究进展[J]. 特种油气藏，2012,19(5):15-20,151. Zhao Zhenyu, Guo Yanru, Wang Yan，et al . Study progress in tectonic evolution and paleogeography of Ordos Basin[J]. Special Oil & Gas Reservoirs, 2012,19(5):15-20,151.
[14] 张春林，李剑，刘锐娥．鄂尔多斯盆地盒8 段致密砂岩气储层微观特征及其形成机理[J]. 中国石油勘探，2019,24(4):476-484. Zhang Chunlin, Li Jian, Liu Rui’e. Microscopic characteristics and forming mechanisms of He 8th member tight sandstone gas reservoirs in Ordos Basin[J]. China Petroleum Exploration, 2019,24(4):476-484.
[15] 党犇．鄂尔多斯盆地构造沉积演化与下古生界天然气聚集关系研究 [D]. 西安：西北大学，2003:9-12. Dang Ben. The tectonic and sedimentary evolution and its relationship to gas accumulation of lower Paleozoic in Ordos Basin[D]. Xi’an:Northwest University, 2003:9-12.
[16] 刘景平，谢仕英，柳克琪，等．鄂尔多斯盆地的演化叠加与含油气性: 中国大陆板块内部一个大型盆地原型[J]. 石油与天然气地质， 1986,7(4):356-367. Liu Jingping, Xie Shiying, Liu Keqi，et al . Evolution stacking and hydrocarbon potential of the Ordos Basin: prototypel analysis of a huge basin in Chinese continental plate[J]. Oil & Gas Geology, 1986,7(4):356-367.
[17] 李剑，张春林，姜福杰，等．鄂尔多斯盆地上石炭统本溪组致密气富集主控因素[J]. 天然气工业，2021,41(4):30-40. LiJian, Zhang ChunLin, Jiang FuJie, et al . Main factors controlling the enrichment of Upper Carboniferous Benxi Formation tight gas in the Ordos Basin [J]. Natural Gas Industry, 2021,41(4):30-40.
[18] 方朝强．鄂尔多斯盆地东部上古生界页岩气成藏条件评价[D]. 西安：西安石油大学，2012:15-17. Fang Chaoqiang. Evaluation of the reservoir forming conditions of shale gas potential of the Upper Paleozoic in eastern Ordos Basin[D]. Xi’an: Xi’an Shiyou University, 2012:15-17.
[19] Zhou H T, Li D Y, Liu X T, et al . Sweet spot prediction in tight sandstone reservoir based on well-bore rock physical simulation[J]. Petroleum Science, 2019,16(1):1285-1300.
[20] Yin X D, Jiang S, Chen S J, et al . Impact of rock type on the pore structures and physical properties within a tight sandstone reservoir in the Ordos Basin, NW China[J]. Petroleum Science, 2020,27(4):896-911.
[21] 汪泽成，陈孟晋，王震，等．鄂尔多斯盆地上古生界克拉通坳陷盆地煤成气成藏机制[J]. 石油学报，2006,27(1):8-12. Wang Zecheng, Chen Mengjin, Wang Zhen, et al . Simulation analysis on formation mechanism of coal-formed gas reservoir in intercratonic depression of the Upper Paleozoic in Ordos Basin[J]. Acta Petrolei Sinica, 2006,27(1):8-12.
[22] 沈玉林，秦勇，申建，等．鄂尔多斯盆地东缘上古生界煤系叠置含气系统发育的沉积控制机理[J]. 天然气工业，2017,37(11):29-35. Shen Yulin, Qin Yong, Shen Jian，et al . Sedimentary control mechanism of the superimposed gas bearing system development in the Upper Palaeozoic coal measures along the eastern margin of the Ordos Basin[J]. Natural Gas Industry, 2017,37(11):29-35.
[23] 霍凯中．鄂尔多斯盆地东部煤层气资源预测模型研究[D]. 青岛：中国石油大学（华东），2007:52-55. Huo Kaizhong. Study on forecasting model of coalbed methane in the east of Ordos Basin[D]. Qingdao: China University of Petroleum (East China), 2007:52-55.
[24] 刘道信．蒙特卡洛法在煤层气目标区储量计算中的应用[J]. 煤炭技术， 2009,28(9):164-165. Liu Daoxin. Monte-carlo method application in reserves calculation of coal bed methane prospects[J]. Coal Technology, 2009,28(9):164-165.
[25] 郭明涛，唐跃刚，苏雪峰．基于蒙特卡洛法的煤层气资源量估算[J]. 煤矿安全，2016,47(10):153-156. Guo Mingtao, Tang Yuegang, Su Xuefeng. Estimating coalbed methane resource based on monte carlo method[J]. Safety in Coal Mines, 2016,47(10):153-156.