川西北剑阁古隆起形成演化过程及其控气作用

Formation and Evolution of Jiange Paleo-Uplift in Northwestern Sichuan Basin and GasControlled Effect

古隆起是四川盆地油气勘探的重点领域。研究剑阁古隆起的构造形态、形成演化和控气作用对川西北地区的油气勘探有着重要的意义。基于剑阁古隆起范围内地质、地球物理和测井资料并结合川西北地区上三叠统须家河组沉积厚度,研究了剑阁古隆起的展布和演化过程。结果表明,剑阁古隆起演化过程分为3个阶段,上三叠统须家河组须一段—须三段沉积期为剑阁古隆起雏形阶段,须四段—须六段沉积期为剑阁古隆起的成熟阶段,早侏罗世为剑阁古隆起的衰亡阶段。剑阁古隆起具有完整的旋回发展过程,须家河组具有良好的生储盖组合,其多期构造运动形成的地层圈闭和岩性圈闭是川西北勘探的有利目标。

Paleo-uplifts are the major areas for petroleum exploration in Sichuan basin. Research on the structural configuration, formationand evolution as well as gas-controlled effect has great significance for petroluem exploration in northwestern Sichuan basin. This paperstudied the distribution and evolution process of Jiange paleo-uplift using the geologic, geophysical and well logging data, combined withthe sedimentary thickness of the Upper Triassic Xujiahe formation in northwestern Sichuan basin. The result shows that the paleo-upliftingprocess can be divided into three stages： the embryo stage（T_（3x1）-T_（3x3））, the mature stage（T_（3x4）-T_（3x6））, and the destruction stage（J_（1z））. The Ji-ange paleo-uplift is of complete evolution cycle, the Xujiahe formation is of good soruce-reservoir-caprock assemblage, and the multistagetectonization-formed stratigraphic and lithologic traps are the favorable targets for petroleum exploration in northwestern Sichuan basin.