In eastern Sichuan, Carboniferous strata are intensely folded and faulted, and complete anticlines are rare; so gas pools are generally non-anticlinal traps.
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- 川东地区石炭纪的构造褶皱强烈,断裂发育,完整背斜很少,气藏一般赋存在背斜圈闭内。