Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (4): 16-23.doi: 10.3969/j.issn.1673-8926.2016.04.003

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Differences of shale between Longmaxi Formation and Da’anzhai member in Sichuan Basin

Yan Jianping 1，2，Cui Zhipeng2，Geng Bin3，Guo Hongmei4，Li Xingwen4   

  1. 1. Sichuan Key Laboratory of Natural Gas Geology，Southwest Petroleum University，Chengdu 610500，China；2. School of Geoscience and Technology，Southwest Petroleum University，Chengdu 610500，China；3. Research Institute of Exploration and Development，Sinopec Shengli Oilfield Company，Dongying 257015, Shandong，China；4. Changqing Division，CNPC Logging Company，Xi’an 710201，China
  • Online:2016-07-20 Published:2016-07-20

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Abstract:

The exploration of nonmarine shale oil and gas gets more and more attention. This paper selected nonmarine shale in Da’anzhai member of Lower Jurassic Ziliujing Formation in Sichuan Basin to conduct comparison with marine shale in Lower Silurian Longmaxi Formation which has gained achievements of preliminary scale production,and then analyzed their differences in strata，rock types，rock fabric，organic geochemical characteristics and physical properties of shale reservoir, so as to establish an evaluation standard for nonmarine shale gas exploration and development in Sichuan Basin. The results show that the buried depth of Longmaxi Formation is generally 2 000?4 000 m, where black siliceous shale, chert, carbonaceous shale and dark gray mudstone are mainly developed, with lamellar structure, and the main minerals of shale are quartz, carbonate minerals, clay minerals, muscovite and pyrite. With higher content of organic matters, Longmaxi shale contains 1%-4% of TOC, with Ro of 2.4%-3.6%, being at the high-over mature stage of gas generation, and dominated by type Ⅰ-kerogen, it mainly developed intergranular pores, intracrystalline pores and microfissure. In addition, the tectonic preservation conditions are good. The buried depth of Da’anzhai member is generally 1 400-4 300 m, where dark shale is mainly developed. Characterized by dark shale with thin coquina or both interbedded, the shale developed lamellation with lamellar structure, and the main minerals are quartz, feldspar, clay minerals, calcite, dolomite and pyrite. The shale in Da’anzhai member contains 0.58%-3.81% of TOC, with Ro of 1.05%-1.85%, being at mature?high mature stage, and dominated by type Ⅱ2 -kerogen, it mainly developed intergranular pores, intracrystalline pores, organism pores, dissolved pores and fissures. Da’anzhai member has features of the coexistence of fractured coquina reservoirs or pore?micro fractured reservoir containing organic coquina with shale gas reservoir. It is considered that compared with Longmaxi Formation, the Da’anzhai member in Sichuan Basin also has a large shale gas resource potential and good prospects for exploration and development.

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