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据重力航磁异常、中新生代构造演化及浅层变形特点,探讨了上扬子地区海相碳酸盐岩层系构造变形的区域不均一性,及其对海相油气分布的控制。研究表明,四川盆地及其周缘褶冲带在不同构造体制下发育了不同的构造样式,圈闭演化的差异性决定了晚期天然气的聚集与散失。其中,川西前陆扩展变形带隐伏断层及牵引背斜组合对海相油气聚集较为有利,川中南古背斜后期继承性演化、调整形成次生气藏,川东及川东北一带中构造层(包括上古生界和中、下三叠统)内断层及其相关褶皱发育,隐伏背斜为大型天然气成藏提供圈闭条件,湘西武陵地区除桑植-石门、花果坪等复向斜外,海相油气勘探难度大。
According to the gravitational aeromagnetic anomaly, the Meso-Cenozoic tectonic evolution and the characteristics of shallow deformation, the paper discusses the regional heterogeneity of structural deformation of the marine carbonate strata in the Upper Yangtze region and its control over the distribution of marine oil and gas. The results show that different tectonic styles have been developed under different tectonic regimes in the fold-fold belt of the Sichuan Basin and its periphery, and the difference of trap evolution determines the accumulation and dissipation of natural gas in the late stage. Among them, the west Sichuan foreland extension deformation belt and the traction anticline are favorable for the accumulation of marine oil and gas. The late Paleogene anticline in the Central Sichuan Basin evolved and inherited and formed the secondary gas reservoirs, the middle tectonic strata in eastern Sichuan and northeastern Sichuan (including the ancient The Mesozoic and the Lower Triassic) faults and their associated folds. The hidden anticlines provide traps for the accumulation of large-scale natural gas. In addition to the synclines such as Sangshi - Shihmen and Huapuoping in western Wuling region, Phase oil and gas exploration difficult.