In order to ascertain the exploration potential of the Lijiapan Shale in the Chang 9 Member of the Ganquan-Fuxian exploration area, Ordos Basin. To this end, a comprehensive dataset encompassing abundant core, logging, mud logging, and geochemical analysis data was utilized. A series of systematic studies were conducted on the geological distribution characteristics, geochemical characteristics, hydrocarbon generation and expulsion laws, as well as the quantitative evaluation of the resource potential of this member's shale. The results are as follows. The shale thickness ranges from 5 to 20 meters, and the high-thickness zones are distributed in the NW-SE direction in the Xiasiwan-Fuxian Area. 80% of the samples have TOC (total organic carbon) content higher than 2%, with organic matter dominated by Type Ⅰ-Ⅱ1 kerogen, and the vitrinite reflectance (Ro) ranges from 0.7% to 1.3%, indicating that the organic matter has generally entered the mature stage. The hydrocarbon generation intensity is mainly 20×104~140×104 t/km2, and the hydrocarbon expulsion intensity is 10×104 ~50×104 t/km2, with high-value zones concentrated in the Xiasiwan-Daozhen-Zhangcunyi Area. The Class Ⅰ potential area has a hydrocarbon generation volume of 12.69×108 t and a hydrocarbon expulsion volume of 4.60×108 t, while the Class Ⅱ potential area has a hydrocarbon generation volume of 20.03×108 t and a hydrocarbon expulsion volume of 7.70×108 t, both of which are regarded as the major target zones for subsequent shale oil exploration. It has been determined that the Lijiapan Shale of the Chang 9 Member is of medium-to-good quality, a mature source rock with effective hydrocarbon-expelling potential, and it is capable of forming a resource pattern of “dual-source coexistence and three-dimensional exploration” with the Chang 7 Member. This understanding overcomes the previous limited evaluation of the resource potential of this member and provides an important geological basis for the deployment of shale oil exploration in the southeastern Ordos Basin.
WU Feng, GE Yun-jin, LI Hong-jin, WANG Chao, LI Xiao-lu, LI Guang-tao, FAN Xiao-wei.
Evaluation of Development Characteristics and Hydrocarbon Generation Potential of Chang 9 Member Lijiapan Shale in Ganquan-Fuxian Area, Ordos Basin[J].
Science Technology and Engineering, 2026, 26(22): 9469-9480 DOI:10.12404/j.issn.1671-1815.2600628
ZhaoWenzhi, HuSuyun, HouLianhua, et al. Continental shale oil types and resource potential in China and the boundary between shale oil and tight oil[J]. Petroleum Exploration and Development, 2020, 47(1): 1-10.
HeJinyi, LengJunying, HeWenjun, et al. Quality and oil-bearing characteristics of different lithofacies of argillaceous source rocks in the Permian Lucaogou Formation, Jimsar Sag, Junggar Basin[J]. Petroleum Geology & Experiment, 2025, 47(3): 606-619.
ZengWenren. Formation mechanism of organic-rich source rocks in mixed sedimentary strata of Saline Lacustrine Basin, Eastern Junggar Basin: a case study of the Permian Lucaogou Formation in Jimsar Sag[D]. Beijing: China University of Petroleum (Beijing), 2024.
SunLongde, JiaChengzao, ZhangJunfeng, et al. Resource potential of Gulong shale oil in the key areas of Songliao Basin[J]. Acta Petrolei Sinica, 2024, 45(12): 1699-1713.
WangMin, MaRui, LiJinbu, et al. Occurrence mechanism of lacustrine shale oil in the Paleogene Shahejie Formation of Jiyang Depression, Bohai Bay Basin, China[J]. Petroleum Exploration and Development, 2019, 46(4): 789-801.
GuoYanqin, LuoKe, LiBo, et al. Provenance analysis and sedimentary system of Chang 7 oil formation in Yishan Slope of Ordos Basin[J]. Science Technology and Engineering, 2026, 26(4): 1437-1448.
LiChan, TongChangbing, YangFan, et al. Development characteristics and influencing factors of shale pore systems in the Yanchang Formation, Ordos Basin[J]. Unconventional Oil & Gas, 2025, 12(3): 22-31.
JiangLongyan, QianMenhui, HeFaqi, et al. Characteristics and main controlling factors of shale oil in the Chang 7 Member of Triassic Yanchang Formation, Fuxian Area, Ordos Basin[J]. Petroleum Geology & Experiment, 2024, 46(5): 941-953.
[17]
孙细宁. 延长探区长7、长9页岩地化特征[D]. 西安: 西安石油大学, 2020.
[18]
SunXining. Geochemical characteristics of Chang 7 and Chang 9 shales in the Yanchang Exploration Area[D]. Xi'an: Xi'an Shiyou University, 2020.
ChenXingzhao, WangXixin, LiShaohua, et al. Oil-water distribution and control factors of Chang 7 in Heshuinan area of Ordos Basin[J]. Science Technology and Engineering, 2025, 25(16): 6628-6641.
YangTianxiang, ZhaoWeiwei, DuanYifei, et al. Source-reservoir characteristics and development model of contimental shale: a case study of Chang 7 member of Yanchang Formation in southeas-tern Ordos Basin[J]. Science Technology and Engineering, 2023, 23(24): 10209-10219.
ZhangTao, DongMancang, AnJigang, et al. Enrichment characteristics and main controlling factors of shale oil and gas in the Chang 7 Member of the Fuxian Area, Ordos Basin[J]. Unconventional Oil & Gas, 2023, 10(5): 75-82.
JiangYang, GongHujun, PuRenhai. Geochemical characteristics of source rocks in the Chang 9-Chang 7 members and their correlation with the tight oil sources of Chang 8 member in the Ganquan-Fuxian Area, Ordos Basin[J]. Sedimentary Geology and Tethyan Geology, 2024, 44(3): 656-670.
MaLang, DuYanjun, LiXinwei, et al. Characteristics and controlling factors of the Chang 9 tight oil reservoir in Zhidan Area, Ordos Basin[J]. Science Technology and Engineering, 2019, 19(23): 59-67.
ZhangWenxuan, WangTing, ShaoDongbo, et al. Distribution and potentialevaluation of the source rocks of the Chang 9 Member in the Longdong Area, Ordos Basin[J]. Natural Gas Geoscience, 2024, 35(3): 465-478.
ShiLiang, FanBojiang, WangXia, et al. Elemental composition and paleo-sedimentary environment of the Chang 9 shale source rocks in the Ordos Basin[J]. Geoscience, 2023, 37(5): 1254-1263.
LiXiaolu, DuYonghui, ChenYiguo, et al. Paleosedimentary environment restoration and its significance of the top shale of Chang 9 Member in the Yanchang Formation, southern Yan'an Area[J]. Unconventional Oil & Gas, 2022, 9(5): 36-41.
LuoLirong, LiJianfeng, YangWeiwei, et al. Characteristics and hydrocarbon generation potential of the Chang 9 source rocks in the Yishaan Slope, Ordos Basin[J]. Xinjiang Petroleum Geology, 2022, 43(3): 278-284.
FuJinhua, LiShixiang, NiuXiaobing, et al. Geological characteristics and exploration of shale oil in Chang 7 Member of Triassic Yanchang formation, Ordos Basin, NW China[J]. Petroleum Exploration and Development, 2020, 47(5): 870-883.
DuJiangmin, ZhangXiaoli, ZhongGaorun, et al. Optimization and application of welllog evaluation methods for organic carbon content in tight oil source rocks: a case study of the Chang 7 Member source rocks in the Yanchang Formation, Ordos Basin[J]. Progress in Geophysics, 2016, 31(6): 2526-2533.