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川西前陆盆地上三叠统砂体沉积厚度大,范围广,发育巨厚的煤系烃源岩,其油气具有多期成藏、燕山期或喜山期聚集、喜山期调整成藏的特点。岩性油气藏分布范围广,类型多,主要存在的岩性相关气藏圈闭类型有以下几种:构造岩性、砂岩透镜体、古河道、砂岩上倾尖灭、地层超覆、成岩、不整合遮挡岩性圈闭;其岩性圈闭形成以近烃源岩裂缝发育的三角洲砂体发育为基础,良好的成藏配置为关键,适配的古构造提供了油气的聚集部位。
The Upper Triassic sand bodies in the western Sichuan foreland basin have thick sedimentary, wide range and huge coal-bearing source rocks with multi-period hydrocarbon accumulation, Yanshanian period or Himalayan period and Himalayan period Features. Lithologic reservoirs have a wide range of distribution types and many types of reservoirs. The main trap types of lithologic gas reservoirs are as follows: tectonic lithology, sandstone lenses, paleo-rivers, up-dip of sandstone, overlying strata, diagenesis, Unconformity occludes lithologic traps; the formation of lithologic traps is based on the development of deltaic sand bodies near the source rocks, and good reservoir formation is the key. The matching paleo-structures provide the accumulation sites for oil and gas.