DEFORMATION CHARACTERISTICS AND PETROLEUM GEOLOGICAL SIGNIFICANCES OF COMPRESSO-SHEAR STRESS FIELDS IN THE WEST SICHUAN DEPRESSION
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摘要: 该文通过川西坳陷晚三叠世以来的形成演化和沉积展布特征以及龙门山冲断带的形变分析认为,龙门山冲断带在印支期为压性应力场环境,燕山早期、中期在左旋压扭应力作用下形成北东东向隆坳相间构造带,其隆褶带上形成的裂缝、微裂缝对致密砂岩的储集能力有较大的改善,有利于油气的富集成藏.Abstract: By analysing on the formation,evolution and sedimentary distribution characteristics of the West Sichuan Depression since the Late Triassic and the deformation of the Longmenshan Thrust Belt,it was considered that the Longmenshan Thrust Belt was in the environment of compressive stress field during the Indosinian period,and formed the NEE-oriented and uplift-depression alternated tectonic belt in the Early-Middle Yanshanian period under the action of sinistral compresso-shear stress.The fissures and microfissures formed in the upfolded belts greatly improved the reservoir capacity of dense sandstone,and were favorable to the enrichment and accumulation of oil and gas.
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