Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (2): 32-43.doi: 10.12108/yxyqc.20260203

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Lithofacies combination characteristics and hydrocarbon accumulation condition of lacustrine shale in Lower Jurassic, eastern Sichuan Basin

YU Chuan1,2,3(), WU Xiaochuan1,2(), WANG Wei1,2,3, WANG Shengxiu1,2,3, ZHANG Yuelei1,2,3, GUO Dongxin1,2,3, LIU Aihua1,2,4   

  1. 1 National and Local Joint Engineering Research Center of Shale Gas Exploration and Development (Chongqing Institute of Geology and Mineral Resources), Chongqing 401120, China
    2 Key Laboratory of Shale Gas Exploration, Ministry of Natural Resources (Chongqing Institute of Geology and Mineral Resources), Chongqing 401120, China
    3 Chongqing Huadi Resources and Environment Technology Co., Ltd., Chongqing 401120, China
    4 Puguang Branch, Sinopec Zhongyuan Oilfield, Dazhou 635000, Sichuan, China
  • Received:2025-07-11 Revised:2025-09-24 Published:2026-02-05 Online:2026-03-01

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Abstract:

Lower Jurassic Lianggaoshan Formation and Ziliujing Formation lacustrine facies dark mud shales widely develop in eastern Sichuan Basin, making them key fields for shale oil and gas exploration. Through the description and sampling analysis of key drilling and typical stratigraphic profiles, lithofacies combinations of terrestrial shale were classified, and comparative analyses were conducted on reservoir formation conditions of shale oil and gas in different lithofacies. The results show that: （1） Lower Jurassic terrestrial shale series in eastern Sichuan Basin exhibit fast sedimentary facies changes and complex lithofacies combinations. Compared with Lower Paleozoic marine shales, they have geological characteristics of “multiple development layers, large cumulative thickness (40-115 m), small single-layer thickness (< 25 m), poor continuity”. （2） Lower Jurassic continental shale in the study area can be divided into three categories: siliceous shale, clayey shale, and shell calcareous shale. Lithological characteristics of different lithofacies types vary greatly and are mainly controlled by their original sedimentary environment. （3） The hydrocarbon generation capacity and storage performance of laminated carbon-bearing clayey shale and carbon-bearing shell-bearing clayey shale are relatively good, organic types of the shale are mainly mixed type of sapropelic mud (mainly type Ⅱ1), with TOC generally exceeding 1.2%. Organic matter pores and microcracks are well-developed, with effective poro-sity mostly above 3.0%, which have favorable conditions for hydraulic fracturing and transformation, and also are favorable lithofacies types for oil and gas enrichment and accumulation. （4） Favorable areas for shale hydrocarbon accumulation in Lianggaoshan Formation of the study area are distributed in Wanzhou-Liangping area and Dianjiang-Fengdu area. Favorable areas for hydrocarbon accumulation in Da’anzhai section of Ziliujing Formation are distributed in Liangping-Kaijiang-Wanzhou area. Favorable areas for hydrocarbon accumulation in Dongyuemiao section of Ziliujing Formation are distributed in Dianjiang-Liangping-Zhongxian area.

Key words: continental shale, hydrocarbon generation capacity, storage performance, brittleness index, Lianggaoshan Formation, Ziliujing Formation, Lower Jurassic, eastern Sichuan Basin

CLC Number: 

  • TE121.31

Fig. 1

Structural location (a) and stratigraphic column of Lower Jurassic (b), eastern Sichuan Basin"

Fig. 2

Comprehensive stratigraphic column of Lower Jurassic in Aojiaying section, eastern Sichuan Basin"

Fig. 3

Microscopic photos of rock thin section of Lower Jurassic, eastern Sichuan Basin"

Fig. 4

Representative cores and thin section microscopic photos of siliceous lithofacies combination in Lower Jurassic, eastern Sichuan Basin"

Fig. 5

TOC distribution of continental dark mud shale in Lower Jurassic, eastern Sichuan"

Fig. 6

Cores and thin section microscopic photos of clayey lithofacies combination in Lower Jurassic, eastern Sichuan Basin"

Fig. 7

Cores and thin section microscopic photos of shell limestone lithofacies combination in Lower Jurassic, eastern Sichuan"

Fig. 8

Kerogen maceral of 5 carbon-bearing shale lithofacies in Lower Jurassic, eastern Sichuan Basin"

Fig. 9

TOC distribution characteristics of 5 carbon-bearing shale lithofacies in Lower Jurassic, eastern Sichuan Basin"

Fig. 10

Distribution characteristics of effective porosity of 5 carbon-bearing shale lithofacies in Lower Jurassic, eastern Sichuan Basin"

Fig. 11

Reservoir space characteristics of shale in Lower Jurassic, eastern Sichuan Basin"

Fig. 12

Distribution characteristics of brittleness index of 5 carbon-bearing shale lithofacies in Lower Jurassic, eastern Sichuan Basin"

Fig. 13

Depositional structure of carbon-bearing shale in Lower Jurassic, eastern Sichuan Basin"

Table 1

Main parameters comparison and reservoirs evaluation of 5 carbon-bearing shale lithofacies in Lower Jurassic, eastern Sichuan Basin"

岩相类型 TOC/% 有机质类型 孔隙度/% 沉积构造 脆性指数 储集性能综合评价
含碳硅质页岩 0.52~1.66/0.84 Ⅲ 0.98~4.05/2.11 厚层—块状 0.44~0.59/0.51 较差
含碳含介壳硅质页岩 0.52~1.73/0.94 Ⅲ 0.68~2.08/1.60 厚层—块状 0.46~0.60/0.51 较差
含碳黏土质页岩 0.68~3.56/1.67 Ⅱ1 0.81~5.89/4.06 细纹层状 0.25~0.46/0.36 较好
含碳含介壳黏土质页岩 0.84~2.11/1.40 Ⅱ2 1.09~6.81/3.81 介壳纹层状 0.30~0.46/0.37 较好
含碳介壳灰质页岩 0.51~1.41/0.97 Ⅱ2 1.01~2.52/1.69 块状 0.40~0.46/0.43 一般

Fig. 14

Favorable areas for hydrocarbon accumulation of continental shale in Lower Jurassic, eastern Sichuan Basin"

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