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通过调研分析前人研究结果与收集统计大量钻井及地球物理资料,探讨四川盆地膏盐岩层对页岩气保存的影响以及龙马溪组页岩气勘探潜力。结果表明:四川盆地下寒武统与三叠系膏盐岩滑脱层在构造变形中起重要的控制作用,是形成盆地内不同构造形态的主要因素,对四川盆地龙马溪组页岩气的保存有着重要作用。膏盐岩层有利于其下部地层异常压力的形成,对页岩气的成藏和保存有重要影响。膏盐岩层是影响四川盆地龙马溪组页岩气勘探前景的重要控住因素之一。综合考虑膏盐岩层分布、页岩埋藏深度、地层厚度与地球化学条件等因素,认为四川盆地龙马溪组页岩气勘探优选区域为自贡—宜宾区域、重庆—永川区域、涪陵区域。
By investigating and analyzing the results of previous studies and collecting a large number of drilling and geophysical data, the impact of gypsum rock in Sichuan Basin on shale gas preservation and shale gas exploration potential in Longmaxi Formation are discussed. The results show that the slipforms of the Lower Cambrian and Triassic gypsum salt rocks in Sichuan Basin play an important controlling role in tectonic deformation and are the main factors for forming different structural forms in the basin. The preservation of shale gas in the Longmaxi Formation in the Sichuan Basin Has an important role. The gypsum-salt rock formation is favorable for the formation of abnormal pressure in the lower strata, which has an important influence on the formation and preservation of shale gas. Gypsum rock formation is one of the important controlling factors that affect shale gas exploration prospect of Longmaxi Formation in Sichuan Basin. Considering the distribution of gypsum rock, the depth of shale burial, the thickness of stratum and the geochemical conditions, it is considered that the shale gas exploration areas of Longmaxi Formation in Sichuan Basin are Zigong - Yibin, Chongqing - Yongchuan and Fuling areas.