川东北地区大安寨段陆相页岩气藏地质特征

doi:10.3969/j.issn.1672-7703.2020.05.005

摘要/Abstract

摘要： 为探索陆相页岩气藏地质特征及勘探开发潜力，以川东北元坝、涪陵地区侏罗系自流井组大安寨段为例，通过岩心观察、薄片鉴定、X射线衍射、有机碳含量分析、扫描电镜、高压压汞和氮气吸附等测试手段，重点研究了陆相页岩沉积环境与岩性、有机地球化学特征、储集空间与含气性、矿物组成、流体性质等气藏地质特征。研究结果表明，大安寨段发育浅湖—半深湖相富有机质页岩，岩性以页岩夹条带状或薄层状砂岩、介壳灰岩为主，有机质类型为Ⅱ2 型或Ⅲ型，TOC为0.33%～3.78%，R o 为 1.11%～1.82%，总体处于成熟—高成熟演化阶段；页岩储层以无机质孔为主，孔隙度为1.5%～6.7%，以小于2nm的微孔和2～50nm的介孔为主，具有良好的含气性（含气量平均为 1.49m3/t）；页岩可压裂性较好，脆性矿物含量平均达51%。已有12口井获高产油气流，总体表现出良好的勘探开发潜力。在对比研究陆相页岩与海相页岩特征差异性基础上，进一步明确有利沉积相是川东北地区大安寨段陆相页岩气富集高产的重要基础，同时受控于岩石组合及岩性成分、有机碳含量、物性参数、流体压力和微裂缝发育程度，以上认识可为四川盆地侏罗系陆相页岩气最佳勘探开发层系优选提供依据。

关键词: 侏罗系, 大安寨段, 陆相页岩气, 四川盆地

Abstract: In this paper, continental shale gas reservoirs in the Da’anzhai member of the Jurassic Ziliujing Formation in the Yuanba and Fuling areas in the northeastern Sichuan Basin is studied to investigate the geological characteristics and exploration and development potential. Core analysis and lab test were conducted, including core observation, thin section identification, X-ray diffraction, organic carbon content analysis, Scanning Electron Microscope, high-pressure mercury injection and nitrogen adsorption, to determine the sedimentary environment and lithology, organic geochemical characteristics, reservoir space and gas-bearing properties, mineral composition and fluid properties of continental shale gas reservoir. The results show that organic- rich shales are developed in shallow to semi-deep lacustrine facies in the Da’anzhai member. The lithology is mainly shale intercalated with stripped or laminated sandstones and shell limestones. The organic matter type is Type Ⅱ2 or type Ⅲ. TOC is 0.33%?3.78%. Ro is 1.11%?1.82%, indicating a mature to high mature stage. The reservoir space in the shale is mainly mineral pores. The porosity ranges from 1.5% to 6.7%, with micro-pores less than 2nm and medium pores of 2?50 nm being the most prevalent. The gas-bearing properties are good (average gas content is 1.49 m3/t). The shale has good fracability and the average content of brittle minerals is 51%. A total of 12 wells have obtained high-production oil and gas flows, showing good exploration and development potential. Comparative study of the differences between the characteristics of continental shale and marine shale indicates that favorable sedimentary facies is an important basis in enrichment and high production of continental shale gas in the Da’anzhai member. Shale gas accumulation is also controlled by rock association and lithologic composition, organic carbon content, physical properties, fluid pressure, and the development degree of micro fractures. These understandings provide reference for selection of the most favorable exploration and development target formations of Jurassic continental shale gas in the Sichuan Basin.

中图分类号:

周德华, 孙川翔, 刘忠宝, 聂海宽. 川东北地区大安寨段陆相页岩气藏地质特征[J]. 中国石油勘探, 2020, 25(5): 32-42.

Zhou Dehua, Sun Chuanxiang, Liu Zhongbao, Nie Haikuan. Geological characteristics of continental shale gas reservoir in the Jurassic Da’anzhai member in the northeastern Sichuan Basin[J]. China Petroleum Exploration, 2020, 25(5): 32-42.

参考文献

[1] 孙焕泉，周德华，蔡勋育，等.中国石化页岩气发展现状与趋势[J]. 中国石油勘探，2020,25(2):14-26. Sun Huanquan, Zhou Dehua, Cai Xunyu, et al . Progress and prospect of shale gas development of Sinopec[J]. China Petroleum Exploration, 2020,25(2):14-26.
[2] 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. 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.
[3] 朱彤，包书景，王烽.四川盆地陆相页岩气形成条件及勘探开发前景 [J]. 天然气工业，2012,32(9):16-21,126-127. Zhu Tong, Bao Shujing, Wang Feng. Pooling conditions of non-marine shale gas in the Sichuan Basin and its exploration and development prospect[J]. Natural Gas Industry, 2012,32(9):16-21,126-127.
[4] 董大忠，邹才能，戴金星，等.中国页岩气发展战略对策建议[J].天然气地球科学，2016,27(3):397-406. Dong Dazhong, Zou Caineng, Dai Jinxing, et al . Suggestions on the development strategy of shale gas in China[J]. Natural Gas Geoscience，2016,27(3):397-406.
[5] 杜燕,刘超,高潮,等.鄂尔多斯盆地延长探区陆相页岩气勘探开发进展、挑战与展望 [J].中国石油勘探，2020,25(2):33-42. Du Yan, Liu Chao, Gao Chao, et al . Progress, challenges and prospects of the continental shale gas exploration and development in the Yanchang exploration area of the Ordos Basin[J]. China Petroleum Exploration, 2020,25(2):33-42.
[6] 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 . The progress and prospect of shale gas exploration and development in China[J]. China Petroleum Exploration, 2020,25(1):31-44.
[7] 赵贤正，周立宏，赵敏，等.陆相页岩油工业化开发突破与实践：以渤海湾盆地沧东凹陷孔二段为例 [J].中国石油勘探，2019,24(5): 589-600. Zhao Xianzheng, Zhou Lihong, Zhao Min, et al . Breakthrough and practice of industrial development on continental shale oil: a case study on Kong-2 Member in Cangdong sag, Bohai Bay Basin[J]. China Petroleum Exploration, 2019,24(5):589-600.
[8] 杜金虎，胡素云，庞正炼，等.中国陆相页岩油类型、潜力及前景[J]. 中国石油勘探，2019,24(5):560-568. Du Jinhu, Hu Suyun, Pang Zhenglian, et al . The types, potentials and prospects of continental shale oil in China[J]. China Petroleum Exploration, 2019,24(5):560-568.
[9] 郭焦锋，王婕，孟凡达.对标国际一流，切实推进中国页岩油上游产业高质量发展 [J].中国石油勘探，2019,24(5):547-552. Guo Jiaofeng, Wang Jie, Meng Fanda. Promoting the high- quality development of China’s shale oil upstream industry by following international first-class standard[J]. China Petroleum Exploration, 2019,24(5):547-552.
[10] 国土资源部油气资源战略研究中心.全国页岩气资源潜力调查评价及有利区优选 [M].科学出版社，2016. Strategic Research Center of Oil and Gas Resources, MLR. Resource assessment and favorable areas selection of shale gas in China[M]. Science Press, 2016.
[11] 梁狄刚，冉隆辉，戴弹申，等.四川盆地中北部侏罗系大面积非常规石油勘探潜力的再认识 [J].石油学报，2011,32(1):8-17. Liang Digang, Ran Longhui, Dai Danshen, et al . A re- recognition of the prospecting potential of Jurassic large-area and on-conventional oils in the central-northern Sichuan Basin [J]. Acta Petrolei Sinica, 2011,32(1):8-17.
[12] 周德华，焦方正，郭旭升，等.川东南涪陵地区下侏罗统页岩油气地质特征 [J].石油与天然气地质，2013,34(4):450-454. Zhou Dehua, Jiao Fangzheng, Guo Xusheng, et al . Geological features of the Lower Jurassic shale gas play in Fuling area, the southeastern Sichuan Basin[J]. Oil & Gas Geology, 2013,34(4):450-454.
[13] 周德华，焦方正，郭旭升，等.川东北元坝区块中下侏罗统页岩油气地质分析 [J].石油实验地质，2013,35(6):596-600,656. Zhou Dehua, Jiao Fangzheng, Guo Xusheng, et al . Geologic analysis of Middle-Lower Jurassic shale reservoirs in Yuanba area, northeastern Sichuan Basin[J]. Petroleum Geology & Experiment, 2013,35(6):596-600,656.
[14] 魏祥峰，黄静，李宇平，等.元坝地区大安寨段陆相页岩气富集高产主控因素 [J].中国地质，2014,41(3):970-981. Wei Xiangfeng, Huang Jing, Li Yuping, et al . The main factors controlling the enrichment and high production of Da’anzhai member continental shale gas in Yuanba area[J]. Geology in China, 2014,41(3):970-981.
[15] 郭旭升，胡东风，李宇平，等.海相和湖相页岩气富集机理分析与思考：以四川盆地龙马溪组和自流井组大安寨段为例[J].地学前缘， 2016,23(2):18-28. Guo Xusheng, Hu Dongfeng, Li Yuping, et al . Analysis and thoughts on accumulation mechanisms of marine and lacustrine shale gas: a case study in shales of Longmaxi formation and Da’anzhai section of Ziliujing formation in Sichuan Basin[J]. Earth Science Frontiers, 2016,23(2):18-28.
[16] 刘忠宝，刘光祥，胡宗全，等.陆相页岩层系岩相类型、组合特征及其油气勘探意义：以四川盆地中下侏罗统为例[J].天然气工业， 2019,39(12):10-21. Liu Zhongbao, Liu Guangxiang, Hu Zongquan, et al . Lithofacies types and assemblage features of continental shale strata and their significance for shale gas exploration: a case study of the Middle and Lower Jurassic strata in the Sichuan Basin[J]. Natural Gas Industry, 2019,39(12):10-21.
[17] 郭彤楼，李宇平，魏志红.四川盆地元坝地区自流井组页岩气成藏条件 [J].天然气地球科学，2011,22(1):1-7. Guo Tonglou, Li Yuping, Wei Zhihong. Reservoir forming conditions of shale gas in Zhiliujing formation of Yuanba area in Sichuan Basin[J]. Natural Gas Geoscience, 2011,22(1):1-7.
[18] 聂海宽，马鑫，余川，等.川东下侏罗统自流井组页岩储层特征及勘探潜力评价 [J].石油与天然气地质，2017,38(3):438-447. Nie Haikuan, Ma Xin, Yu Chuan, et al . Shale gas reservoir characteristics and its exploration potential-analysis on the Lower Jurassic shale in the eastern Sichuan Basin[J]. Oil & Gas Geology, 2017,38(3):438-447.
[19] 朱彤，胡宗全，刘忠宝，等.四川盆地湖相页岩气源—储配置类型及评价 [J].石油与天然气地质，2018,39(6):1146-1153. Zhu Tong, Hu Zongquan, Liu Zhongbao, et al . Types and evaluation of the source-reservoir configuration of lacustrine shale gas in the Sichuan Basin[J]. Oil & Gas Geology, 2018, 39(6):1146-1153.
[20] 邹才能，杨智，王红岩，等.“进源找油”：论四川盆地非常规陆相大型页岩油气田 [J].地质学报，2019,93(7):1551-1562. Zou Caineng, Yang Zhi, Wang Hongyan, et al .“Exploring petroleum inside source kitchen”: Jurassic unconventional continental giant shale oil & gas field in Sichuan Basin, China[J]. Acta Geologica Sinica, 2019,93(7):1551-1562.
[21] Chen Lei, Jiang Zhenxue, Liu Keyu, et al . Effect of lithofacies on gas storage capacity of marine and continental shales in the Sichuan Basin, China[J]. Journal of Natural Gas Science and Engineering, 2016,36:773-785.
[22] 聂海宽，金之钧，边瑞康，等.四川盆地及其周缘上奥陶统五峰组—下志留统龙马溪组页岩气“源—盖控藏”富集[J].石油学报， 2016,37(5):557-571. Nie Haikuan, Jin Zhijun, Bian Ruikang, et al . The“source- cap hydrocarbon-controlling”enrichment of shale gas in Upper Ordovician Wufeng formation of Sichuan Basin and its periphery[J]. Acta Petrolei Sinica, 2016,37(5):557-571.
[23] 何治亮，胡宗全，聂海宽，等.四川盆地五峰组—龙马溪组页岩气富集特征与“建造—改造”评价思路[J].天然气地球科学， 2017,28(5):724-733. He Zhiliang, Hu Zongquan, Nie Haikuan, et al . Characterization of shale gas enrichment in the Wufeng-Longmaxi Formation in the Sichuan Basin and its evaluation of geological construction- transformation evolution sequence[J]. Natural Gas Geoscience, 2017,28(5):724-733.
[24] 王超，张柏桥，舒志国，等.四川盆地涪陵地区五峰组—龙马溪组海相页岩岩相类型及储层特征 [J].石油与天然气地质，2018,39(3): 485-497. Wang Chao, Zhang Boqiao, Shu Zhiguo, et al . Lithofacies types and reservoir characteristics of marine shales of the Wufeng formation-Longmaxi formation in Fuling area, the Sichuan Basin[J]. Oil & Gas Geology, 2018,39(3):485-497.
[25] 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. Wei Xiangfeng, Guo Tonglou, Liu Ruobing. Geochemical features of shale gas and their genesis in Jiaoshiba block of Fuling Shale gas field, Chongqing[J]. Natural Gas Geoscience, 2016,27(3):539-548.
[26] 郑益军.四川盆地东南缘五峰—龙马溪组页岩地球化学、物性特征及其影响因素 [D].中国科学院大学(中国科学院广州地球化学研究所)， 2017. Zheng Yijun. Geochemical and physical characteristics of the Wufeng—Longmaxi formation in the southeastern Sichuan Basin and the influencing factors[D]. University of Chinese Academy of Sciences (Guangzhou Institute of Geochemistry, Chinese Academy of Sciences), 2017.
[27] 腾格尔，申宝剑，俞凌杰，等.四川盆地五峰组—龙马溪组页岩气形成与聚集机理 [J].石油勘探与开发，2017,44(1):69-78. Borjigin Tenger, Shen Baojian, Yu Lingjie, et al . Mechanisms of shale gas generation and accumulation in the Ordovician Wufeng-Longmaxi Formation, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2017,44(1):69-78.
[28] 王玉满，黄金亮，李新景，等.四川盆地下志留统龙马溪组页岩裂缝孔隙定量表征 [J].天然气工业，2015,35(9):8-15. Wang Yuman, Huang Jinliang, Li Xinjing, et al . Quantitative characterization of fractures and pores in shale beds of the Lower Silurian, Longmaxi formation, Sichuan Basin[J]. Natural Gas Industry, 2015,35(9):8-15.
[29] 管全中，董大忠，王淑芳，等.海相和陆相页岩储层微观结构差异性分析 [J].天然气地球科学，2016,27(3):524-531. Guan Quanzhong, Dong Dazhong, Wang Shufang, et al . Analyses on differences of microstructure between marine and lacustrine facies shale reservoirs[J]. Natural Gas Geosciences, 2016,27(3):524-531.
[30] 聂海宽，边瑞康，张培先，等.川东南地区下古生界页岩储层微观类型与特征及其对含气量的影响 [J].地学前缘，2014,21(4):331-343. Nie Haikuan, Bian Ruikang, Zhang Peixian, et al . Micro- types and characteristics of shale reservoir of the Lower Paleozoic in Southeast Sichuan Basin, and their effects on the gas content[J]. Earth Science Frontiers, 2014,21(4):331-343.
[31] Chen Qian, Yan Xiangbin, Guo Yuanling, et al . Geochemistry, petrology and mineralogy of coal measure shales in the Middle Jurassic Yan’an formation from Northeastern Ordos Basin, China: implications for shale gas accumulation[J]. Acta Geologica Sinica, 2018,92:2333-2350.
[32] Wang F P, Gale J F W. Screening criteria for shale gas systems[J]. Gulf Coast Association of Geological Societies Transactions, 2009,59:779-793.
[33] Xu Qilu, Liu Bo, Ma Yongsheng, et al . Geological and geochemical characterization of lacustrine shale: a case study of Jurassic Da’anzhai member shale in the central Sichuan Basin, southwest China[J]. Journal of Natural Gas Science and Engineering, 2017,47:124-139.
[34] 刘树根，马文辛，Luba Jansa，等.四川盆地东部地区下志留统龙马溪组页岩储层特征 [J].岩石学报，2011,27(8):2239-2252. Liu Shugen, Ma Wenxin, Luba Jansa, et al . Characteristics of the shale gas reservoir rocks in the Lower Silurian Longmaxi formation, East Sichuan Basin, China[J]. Acta Petrologica Sinica, 2011,27(8):2239-2252.
[35] 刘江涛，李永杰，张元春，等.焦石坝五峰组—龙马溪组页岩硅质生物成因的证据及其地质意义 [J].中国石油大学学报，2017,41(1): 34-41. Liu Jiangtao, Li Yongjie, Zhang Yuanchun, et al . Evidences of biogenic silica of Wufeng-Longmaxi formation shale in Jiaoshiba area and its geological significance[J]. Journal of China University of Petroleum, 2017,41(1):34-41.
[36] 陈旭，陈清，甄勇毅，等.志留纪初宜昌上升及其周缘龙马溪组黑色笔石页岩的圈层展布模式 [J].中国科学：地球科学，2018, 48(9):1198-1206. Chen Xu, Chen Qing, Zhen Yongyi, et al . Distribution of the black graptolitic shales from Silurian Yichang Elevation and its periphery[J]. Science China: Earth Sciences, 2018,48(9):1198-1206.