Lithofacies characteristics and favorable source rock-reservoir combination of Yingxiongling shale in Qaidam Basin

doi:10.3969/j.issn.1672-7703.2024.02.006

Abstract

Abstract: Yingxiongling shale in Qaidam Basin has favorable conditions for oil accumulation and enrichment, with oil resources of up to 44.5×10⁸ t. However, the shale has a vertical thickness of more than 1000 m and the shale lithofacies and lithofacies combinations vary greatly, which bring huge challenges to the effective exploration and development of shale oil. The core sections with a length of 578 m from 12 typical wells, including Chai 2-4, Chai 906, and Chai 12 are used to analyze the petrology, organic geochemistry, and reservoir characteristics of Yingxiongling shale. The results indicate that Yingxiongling shale shows distinct characteristics of mixed sediments, with the main mineral composition of calcite, dolomite, and clay minerals, and the sedimentary structure is dominated by laminae with a size of less than 1 cm. Based on the “binary” nomenclature, five types of shale lithofacies are subdivided in the study area, namely, laminated limy dolomite, laminated dolomitic limestone, layered limy dolostone, layered dolomitic limestone, and laminated argillaceous shale. The comprehensive evaluation results of organic geochemistry and reservoir performance of various types of lithofacies show that the laminated dolomitic limestone and the layered limy dolostone are the optimum lithofacies of source rock and reservoir, respectively, with the main reservoir space of dolomite intercrystal pores. The sweet spot comprehensive evaluation results and production performance have confirmed that the interbed of layered limy dolomite and laminated dolomitic limestone is the most favorable source rock-reservoir combination pattern, showing good connectivity among sweet spots in lateral and high heterogeneity in vertical.

CLC Number:

TE112.22

Xing Haoting, Kuang Lichun, Wu Kunyu, Zhang Jing, Zhang Na, Zhang Menglin, Deng Liben, Lu Zhenhua, Li Yafeng, Zhang Qinghui. Lithofacies characteristics and favorable source rock-reservoir combination of Yingxiongling shale in Qaidam Basin[J]. China Petroleum Exploration, 2024, 29(2): 70-82.

References

[1] 余国，陆如泉，姜学峰，等.2022年国内外油气行业发展报告[M].北京：石油工业出版社，2023.
Yu Guo, Lu Ruquan, Jiang Xuefeng, et al. 2022 domestic and foreign oil and gas industry development report[M]. Beijing: Petroleum Industry Press, 2023.
[2] 李国欣，朱如凯，张永庶，等.柴达木盆地英雄岭页岩油地质特征、评价标准及发现意义[J].石油勘探与开发，2022,49(1):18-31.
Li Guoxin, Zhu Rukai, Zhang Yongshu, et al. Geological characteristics, evaluation criteria and discovery significance of Paleogene Yingxiongling shale oil in Qaidam Basin, NW China[J]. Petroleum Exploration and Development, 2022,49(1): 18-31.
[3] 黎茂稳，马晓潇，金之钧，等. 中国陆相页岩油类型、资源潜力及与致密油的边界[J]. 石油勘探与开发，2020,47(1):1-10.
Li Maowen, Ma Xiaoxiao, Jin Zhijun, et al. Diversity in the lithofacies assemblages of marine and lacustrine shale strata and significance for unconventional petroleum exploration in China[J]. Petroleum Exploration and Development, 2020,47(1): 1-10.
[4] Mount J F. Mixing of silicilastics and carbonate sediments in shallow shelf environments[J]. Geology, 1984,(12):432-435.
[5] Mount J F. Mixed siliciclastic and carbonate sediments: a proposed first-order textural and compositional classification[J]. Sedimentology, 1985,32(3):435-442.
[6] 杨朝青，沙庆安.云南曲靖中泥盆统曲靖组的沉积环境：一种陆源碎屑与海相碳酸盐的混合沉积[J]. 沉积学报，1990,8(2):59-66.
Yang Chaoqing, Sha Qing’an. Sedimentary environment of the middle development Qujing Formation, Qujing, Yunnan Province: a kind of mixing sedimentation of terrigenous clastics and carbonate[J]. Acta Sedimentologica Sinica, 1990,8(2):59-66.
[7] 邹才能，朱如凯，吴松涛，等.常规与非常规油气聚集类型、特征、机理及展望：以中国致密油和致密气为例[J].石油学报，2012, 33(2):173-187.
Zou Caineng, Zhu Rukai, Wu Songtao, et al. Types, charact-eristics, genesis and prospects of conventional and unconventiaonal hydrocarbon accumulations: taking tight oil and tight gas in China as an instance[J]. Acta Petrolei Sinica, 2012,33(2):173-187.
[8] Loucks R G, Ruppel S C. Mississippian Barnett Shale: lithofacies and depositional setting of a deep-water shale-gas succession in the Fort Worth Basin, Texas[J]. AAPG Bulletin, 2007,91(4):579-601.
[9] Hickey J J, Bo H. Lithofacies summary of the Mississippian Barnett Shale, Mitchell 2 T.P. Sims well, Wise County, Texas[J]. AAPG Bulletin, 2007, 91(4):437－443.
[10] Wang G, Carr T R. Organic-rich Marcellus Shale lithofacies modeling and distribution pattern analysis in the Appalachian Basin[J]. AAPG Bulletin, 2013,97(12):2173-2205.
[11] 赵建华，金之钧，金振奎，等.四川盆地五峰组—龙马溪组页岩岩相类型与沉积环境[J].石油学报，2016,37(5):572-586．
Zhao Jianhua, Jin Zhijun, Jin Zhenkui, et al. Lithofacies types and sedimentary environment of shale in Wufeng-Longmaxi Formation, Sichuan Basin[J]. Acta Petrolei Sinica, 2016,37(5): 572-586．
[12] 赵圣贤，夏自强，刘文平，等.四川盆地南部泸203井区五峰组—龙马溪组页岩裂缝特征及形成演化[J].油气地质与采收率， 2022，29（5）：28-38.
Zhao Shengxian，Xia Ziqiang，Liu Wenping，et al. Fracture characteristics and evolution of Wufeng-Longmaxi Formation shale in Lu203 well area in southern Sichuan Basin[J]. Petroleum Geology and Recovery Efficiency，2022,29(5):28-38.
[13] 邱振，邹才能.非常规油气沉积学：内涵与展望[J].沉积学报，2020, 38(1):1-29.
Qiu Zhen, Zou Caineng. Unconventional petroleum sedimentology: connotation and prospect[J]. Acta Sedimentologica Sinica, 2020, 38(1):1-29.
[14] 吴婵，阎存凤，李海兵，等.柴达木盆地西部新生代构造演化及其对青藏高原北部生长过程的制约[J].岩石学报，2013,29(6):2211-2222.
Wu Chan, Yan Cunfeng, Li Haibing, et al. Cenozoic tectonic evolution of the western Qaidam Basin and its constrain on the growth of the northern Tibetan Plateau[J]. Acta Petrologica Sinica, 29(6):2211-2222.
[15] 崔俊，毛建英，赵为永，等. 柴达木盆地英雄岭页岩纹层结构特征及石油地质意义[J]. 中国石油勘探，2023,28(5):43-53.
Cui Jun, Mao Jianying, Zhao Weiyong, et al. Characteristics of laminated texture and petroleum geological significance of Yingxiongling shale in Qaidam Basin[J]. China Petroleum Exploration, 2023,28(5):43-53.
[16] 李国欣，张永庶，陈琰，等.柴达木盆地油气勘探进展、方向与对策[J]. 中国石油勘探，2022,27(3):1-19.
Li Guoxin, Zhang Yongshu, Chen Yan, et al. Progress, orientation and countermeasures of petroleum exploration in Qaidam Basin[J]. China Petroleum Exploration, 2022,27(3): 1-19.
[17] 潘双苹，胡光明，李积永，等.柴达木盆地扎哈泉地区新近纪物源分析[J]. 地质科技通报，2023,42(3):201-209.
Pan Shuangping, Hu Guangming, Li Jiyong, et al. Analysis of Neogene provenance in Zhahaquan area, Qaidam Basin[J]. Bulletin of Geological Science and Technology, 2023,42(3):201-209.
[18] 郭得龙，申颍浩，林海，等.柴达木盆地英雄岭页岩油CP1井压裂后甜点分析[J].中国石油勘探，2023,28(4):117-128.
Guo Delong, Shen Yinghao, Lin Hai, et al. Post fracturing shale oil sweet spot evaluation in Well CP1 in Yingxiongling area, Qaidam Basin[J]. China Petroleum Exploration, 2023,28(4):117-128.
[19] 潘家伟，李海兵，孙知明，等.阿尔金断裂带新生代活动在柴达木盆地中的响应[J]. 岩石学报，2015,31(12):3701-3712.
Pan Jiawei, Li Haibing, Sun Zhiming, et al. Tectonic responses in the Qaidam Basin induced by Cenozoic activities of the Altyn Tagh fault[J]. Acta Petrologica Sinica, 2015,31(12):3701-3712.
[20] 田明智，朱超，李森明，等.湖相碳酸盐岩测井岩相识别技术与应用：以柴达木盆地英西地区为例[J]. 中国石油勘探，2023,28(1):135-143.
Tian Mingzhi, Zhu Chao, Li Senming, et al. Application of logging lithofacies identification technology of lacustrine carbonate rocks:a case study of Yingxi area, Qaidam Basin[J]. China Petroleum Exploration, 2023,28(1):135-143.
[21] 张永庶，伍坤宇，姜营海，等.柴达木盆地英西深层碳酸盐岩油气藏地质特征[J]. 天然气地球科学，2018,29(3):358-369.
Zhang Yongshu, Wu Kunyu, Jiang Yinghai, et al. Geological characteristics of deep carbonatehydrocarbon-bearing pool in the western Yingxiongling area in Qaidam Basin[J]. Natural Gas Geoscience, 2018,29(3):358-369．
[22] 王金荣，彭作林，李益三.柴达木盆地构造应力场及其地质意义[J]. 兰州大学学报（自然科学版），1991,27(8):120-125.
Wang Jinrong, Peng Zuolin, Li Yisan. The tectonic stress field for the Qaidam Basin and its geological significance[J]. Journal of Lanzhou University(Natural Sciences), 1991,27(8):120-125.
[23] 张明利，金之钧，万天丰，等.柴达木盆地应力场特征与油气运聚关系[J]. 石油与天然气地质，2005,26(5):674-679.
Zhang Mingli, Jin Zhijun, Wan Tianfeng, et al. Ａ discussion on relationship between tectonic stress field and migration and accumulation of hydrocarbons in Qaidam Basin[J]. Oil & Gas Geology, 2005,26(5):674-679.
[24] 伍坤宇，廖春，李翔，等.柴达木盆地英雄岭构造带油气藏地质特征[J].现代地质，2020,34(2):379-389.
Wu Kunyu, Liao Chun, Li Xiang, et al. Geological Character-istics of Hydrocarbon Pool in Yingxiongling Structural Zone, Qaidam Basin[J]. Geoscience, 2020,34(2):379-389.
[25] 吕宝凤，赵小花，周莉，等.柴达木盆地新生代沉积转移及其动力学意义[J].沉积学报，2008,26(4):553-558.
Lv Baofeng, Zhao Xiaohua, Zhou Li, et al. Cenozoic sedimentary migration in Qaidam Basin and its significance an the dynamic mechanism[J]. Acta Sedimentologica Sinica, 2008,26(4):553-558.
[26] Lu Haijian, Xiong Shangfa. Magnetostratigraphy of the Dahonggou section, northern Qaidam Basin and its bearing on Cenozoictectonic evolution of the Qilian Shan and Altyn Tagh Fault[J]. Earth and Planetary Science Letters, 2009,288(3/4): 539-550.
[27] 付锁堂，马达德，陈琰，等.柴达木盆地油气勘探新进[J]. 石油学报，2016,37(增刊1):1-10.
Fu Suotang, Ma Dade, Chen Yan, et al. New advance of petroleum and gas exploration in Qaidam Basin[J]. Acta Petrolei Sinica, 2016,37(S1):1-10.
[28] 施振生，邱振.海相细粒沉积层理类型及其油气勘探开发意义[J]. 沉积学报，2021,39(1):181-196.
Shi Zhensheng, Qiu Zhen. Main bedding types of marine fine-grained sediments and their significance for oil and gas exploration and development[J]. Acta Sedimentologica Sinica, 2021,39(1):181-196.
[29] Lazar O R, Bohacs K M, Macquaker J H S, et al. Capturing key attributes of fine-grained sedimentary rocks in outcrops, cores, and thin sections: nomenclature and description guidelines[J]. Journal of Sedimentary Research, 2015,85(3):230-246.
[30] 朱筱敏.沉积岩石学(第四版)[M].北京：石油工业出版社，2008.
Zhu Xiaomin. Sedimentary petrology(fourth edition)[M]. Beijing: Petroleum Industry Press, 2008.
[31] 国家市场监督管理总局，国家标准化管理委员会.沉积岩中总有机碳测定：GB/T 19145—2022[S].北京：中国标准出版社，2022.
State Administration for Market Regulation, Standardization Administration of the People’s Republic of China. Determination of total organic carbon in sedimentary rocks: GB/T 19145—2022[S]. Beijing: Standards Press of China, 2022.
[32] 孔祥鑫，姜在兴，韩超，等. 束鹿凹陷沙三段下亚段细粒碳酸盐纹层特征与储集意义[J]. 油气地质与采收率，2016,23(4):19-26.
Kong Xiangxin, Jiang Zaixing, Han Chao, et al. Laminations characteristics and reservoir significance of fine-grained carbonate in the lower 3rd member of Shahejie Formation of Shulu Sag[J]. Petroleum Geology and Recovery Efficiency, 2016,23(4):19-26.
[33] 黄成刚，崔俊，关新，等.柴达木盆地英西地区S3-1井渐新统下干柴沟组储集空间类型[J].地球科学与环境学报，2017,39(2):255-266.
Huang Chenggang, Cui Jun, Guan Xin, et al. Reservoir space types of oligocene Xiaganchaigou Formation from Well S3-1 in Yingxi area of Qaidam Basin, China[J]. Journal of Earth Sciences and Environment, 2017,39(2):255-266.
[34] 国家市场监督管理总局，国家标准化管理委员会.油气储层评价方法：GB/T6284—2011[S].北京：中国标准出版社，2011.
State Administration for Market Regulation, Standardization Administration of the People’s Republic of China. Evaluating methods of oil and gas reservoirs: GB/T6284—2011[S]. Beijing: Standards Press of China, 2011.
[35] 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 of unconventional oil and gas development of CNPC[J]. China Petroleum Exploration, 2020,25(2):1-13.
[36] 焦方正，邹才能，杨智.陆相源内石油聚集地质理论认识及勘探开发实践[J].石油勘探与开发，2020,47(6):1067-1078.
Jiao Fangzheng, Zou Caineng, Yang Zhi. Geological theory and exploration & development practice of hydrocarbon accumulation inside continental source kitchens[J]. Petroleum Exploration and Development, 2020,47(6):1067-1078.
[37] 卜淘，严小勇，伍梓健，等.基于返排期动态数据的页岩气井EUR快速评价方法[J].非常规油气，2023,10(3):74-79.
Bu Tao, Yan Xiaoyong, Wu Zijian, et al. Quick evaluation method if EUR for shale gas wells based on dynamic data of flowback period[J]. Unconventional Oil & Gas, 2023,10(3): 74-79.