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四川盆地是受深断裂活动形成的菱形断陷区。盆地内断褶带的发生、发展主要受喜马拉雅期深断裂压缩活动的控制,伴随这些深断裂的发展过程,形成了发育程度不同的断褶带,其中多数呈隐伏状态。晚期断褶构造及后生孔洞缝的发育程度,控制了二、三叠系异常高压及地温的分布。气藏主要形成于喜马拉雅期。

Mechanism of Forming Fault-folded Structure in Sichuan Basin

Sichuan Basin is a rhombic fault-depression area formed by deep fault activity. The generation and de- velopment of the fault-folded belts in the basin were controlled by the compressional activity of the deep faults in Himalayan Time. Accommpied with the growth of these deep faults, there formed the fault-folded belts with various developments, of which majority are in hidden state. The distribution of the abnormally high pressures and geotemperatures in Triassic and Permian is controlled by the developments of the later fault-folded structures and deuterogenous pores, cavities and fractures. The gas reservoirs were mainly formed in Himalayan Time.