Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (2): 52-64.doi: 10.12108/yxyqc.20240206

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Geological characteristics and enrichment conditions of shale oil of Jurassic Lianggaoshan Formation in Yilong-Pingchang area，Sichuan Basin

BAI Xuefeng1,2,3, LI Junhui2,3, ZHANG Dazhi2,3, WANG Youzhi2,3, LU Shuangfang1, SUI Liwei2,3, WANG Jiping2,3, DONG Zhongliang2,3   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China;
    2. National Key Laboratory for Multi-resource Collaborated Green Development of Continental Shale Oil, Daqing 163712, Heilongjiang, China;
    3. Research Institute of Exploration and Development, PetroChina Daqing Oilfield Company Ltd., Daqing 163712, Heilongjiang, China
  • Received:2023-10-19 Revised:2023-11-08 Online:2024-03-01 Published:2024-03-06

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Abstract: Based on the geochemical and other experimental analysis results of drilling cores，combined withproduction testing data，the geological characteristics and enrichment conditions of shale oil of Jurassic LianggaoshanFormation in Yilong-Pingchang area of Sichuan Basin were studied，and favorable exploration areas weredivided. The results show that：（1）The Lianggaoshan Formation in Yilong-Pingchang area is a sediment during the third lacustrine basin expansion stage of Jurassic，which has undergone the sedimentary environment changes of shore lake to shallow lake in the lower member of Lianggaoshan Formation，deep lake to semi-deep lake and shallow lake in the middle and lower part of the upper member of Lianggaoshan Formation，and delta front and shallow lake in upper part of the upper member of Lianggaoshan Formation.（2）The shales of Lianggaoshan Formation can be divided into felsic shales，calcareous shales and clay shales，with a high abundance of organic matter，TOC values ranging from 0.50% to 3.39% and an average of 1.30%. The organic matters are mainly type Ⅱ1 and type Ⅱ2，with a high degree of thermal evolution and vitrinite reflectance（Ro）ranging from 1.00% to1.90%，and indicating a high mature to over mature stage.（3）The shales of Lianggaoshan Formation have good physical properties，and the reservoir space types such as inorganic pores，organic pores and structural fractures are developed. The porosity ranges from 0.48% to 7.17%，with an average value of 3.61%. The oil-bearing capacity is good and mainly composed of light components，which is scattered and punctate in the whole，and locally concentrated in clumps. The lower part of the upper member of Lianggaoshan Formation is more developed with organic-rich shale，which is the focus of exploration at present.（4）The weak subsidence environment during the transitional period of foreland basin，widespread distribution of deep lacustrine sediments，the high degree of thermal evolution and widespread development of micro-fractures are favorable for shale oil and gas enrichment in Lianggaoshan Formation. The central and southern regions of the study area are shale oil and gas potential zones，with shale reservoir thickness generally greater than 15m，TOC value greater than 1.50%，porosity greater than 4.00%，Ro greater than 1.30%. Lianggaoshan Formation has 26.75×108t of shaleoilresources and 1.72×1012m3 of shale gas resources，which is expected to become themain layer for increasing oil production in Sichuan Basin.

Key words: shale oil, light oil, lacustrine basin expansion stage, foreland basin, weak subsidence environment, deep lacustrine facies, high-over mature stage, micro-fracture, Lianggaoshan For mation, Jurassic, Yilong-Pingchang area, Sichuan Basin

CLC Number: 

  • TE122
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[2] WANG Dongqi, YIN Daiyin. Empirical formulas of relative permeability curve of water drive reservoirs[J]. Lithologic Reservoirs, 2017, 29(3): 159 -164 .
[3] LI Yun, SHI Zhiqiang. Study on fluid inclusion of tight sandstone reservoir of Upper Triassic Xujiahe Formation in central Sichuan Basin[J]. Lithologic Reservoirs, 2008, 20(1): 27 -32 .
[4] JIANG Ren, FAN Tailiang, XU Shouli. Concept and techniques of seismic geomorphology[J]. Lithologic Reservoirs, 2008, 20(1): 33 -38 .
[5] ZOU Mingliang, HUANG Sijing, HU Zuowei, FENG Wenli, LIU Haoniannian. The origin of carbonate cements and the influence on reservoir quality of Pinghu Formation in Xihu Sag, East China Sea[J]. Lithologic Reservoirs, 2008, 20(1): 47 -52 .
[6] WANG Bingjie, HE Sheng, NI June, FANG Du. Activity analysis of main faults in Qianquan area, Banqiao Sag[J]. Lithologic Reservoirs, 2008, 20(1): 75 -82 .
[7] CHEN Zhenbiao, ZHANG Chaomo, ZHANG Zhansong, LING Husong, SUN Baodian. Using NMR T2 spectrum distribution to study fractal nature of pore structure[J]. Lithologic Reservoirs, 2008, 20(1): 105 -110 .
[8] ZHANG Houfu, XU Zhaohui. Discussion on stratigraphic-lithologic reservoirs exploration in the aspect of the research history of reservoirs[J]. Lithologic Reservoirs, 2008, 20(1): 114 -123 .
[9] ZHANG Xia. Cultivation of exploration creativity[J]. Lithologic Reservoirs, 2007, 19(1): 16 -20 .
[10] YANG Wuyang, YANG Wencai, LIU Quanxin, WANG Xiwen. 3D frequency and space domain amplitude-preserved migration with viscoelastic wave equations[J]. Lithologic Reservoirs, 2007, 19(1): 86 -91 .
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