四川盆地及周缘下古生界海相页岩气富集高产主控因素——以焦石坝地区五峰组—龙马溪组为例
marine shale gas in the Lower Paleozoic of Sichuan Basin and its periphery: A case study of the Wufeng-Longmaxi Formation of Jiaoshiba area
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摘要: 提要:利用钻井、地震及样品实验数据资料,首先对焦石坝地区五峰组—龙马溪组页岩气的形成条件进行了评价,然后探讨了四川盆地及周缘下古生界海相页岩气富集高产主控因素。研究认为:焦石坝地区五峰组—龙马溪组泥页岩具有厚度大、有机质丰度高、类型好、热演化程度较高、储集物性以及含气性好、以及良好保存条件和可压性等特点;四川盆地及周缘下古生界海相页岩气富集高产主控因素是富有机质泥页岩的发育程度、保存条件、天然裂缝的发育和泥页岩的可压裂性等,因为富有机质泥页岩的发育为页岩气的生成和储集提供了丰富的物质基础,良好的保存条件是页岩气富集的关键,天然裂缝和可压裂性是高产的重要保证。Abstract: Abstract:The formation conditions of marine shale gas in the Wufeng-Longmaxi Formation of Jiaoshiba area were evaluated in this paper on the basis of drilling, seismic survey and sample experiment data. The major factors controlling the accumulation and high productivity of marine shale gas in the lower paleozoic of Sichuan Basin were analyzed. The results show that shales of Longmaxi Formation in Jiaoshiba area are characterized by thick formation, good type, high levels of thermal evolution of organic matter, good physical and gas-bearing properties, suitable preservation condition and fracability. Meanwhile, the development and preservation condition of organic-rich shales, natural fractures development and crushability of the shales constitute the major factors controlling the accumulation and high productivity of marine shale gas in the lower Paleozoic strata of Sichuan Basin and its periphery. As abundant materials were provided by the development of organic-rich shales for shale gas generation and storage, suitable preservation conditions seem to be the key factor for accumulation and high productivity of shale gas. Natural fractures and crushability have guaranteed high productivity of shale gas.
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Key words:
- marine shale gas /
- accumulation and high productivity /
- Lower Paleozoic /
- Sichuan basin /
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