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- Title
四川盆地海相、湖相页岩气形成条件对比及开发策略.
- Authors
朱彤; 俞凌杰; 王烽
- Abstract
Shale gas exploration in Sichuan Basin has gained great success. In south and southeast of Sichuan Province, Lower Silurian marine shale gas achieved commercial discovery, and Lower Jurassic lacustrine shale gas in east and northeast of Sichuan saw industrial gas flow. Characteristics of the shale gas in Sichuan Basin have been revealed including multi-flied, multi-layer and multi-type. Using Argon-ion polishing-SEM, MIP-adsorption analysis, pulse test and X-diffraction test, features between marine and lacustrine mud shale such as sedimentary facies, hydrocarbon generation conditions, reservoir characteristics, fracability and enrichment have been systematically investigated and compared. Results indicate that for marine facies, the high quality shales in Longmaxi Formation mainly developed at the deep-water shelf within a craton interior depression. The black shales have wide distribution, consistent thickness, high organic carbon, high organic porosity, well-developed lamellation and rich organic silicate content. All these features are favorable for marine shale gas generation, enrichment, storage, and reservoir stimulation. There are three different types in terms of shale gas enrichment (ultra-high pressure (UHP) in the basin, overpressured shale gas at the inner edge of the basin,underpressured shale gas outside the basin). The most favorable types for shale gas exploration are intra-basin UHP and overpressured shale gas type; for lacustrine facies at Daanzhai interval, favorable lithology combination is interbedded shale and limestone which mainly developed in an alternate deposition changing between storm beach and mud of the carbonate lake slope at highest lake level. With large accumulated thickness, higher organic carbon, more grain-edge pores and fractures, high permeability and more brittle minerals (silica and calcium), these shales are considered as potential targets for lacustrine shale gas exploration. Based on the accumulation characteristics of different shale gas types in both marine and lacustrine facies, carrying out research on adaptive exploration and development technology is the key to realize an effective and economical shale gas development in various fields.
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 4, p633
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.02.003