论文部分内容阅读
通过库车坳陷克拉苏构造带喀桑托开背斜带上3个相邻背斜超压流体排放通道的识别、砂岩溶蚀作用与溶蚀孔隙形成的研究,表明超压体系砂岩溶蚀孔隙的形成与超压流体排放通道密切相关。克拉2构造为断层传播褶皱,相关断层向下沟通侏罗系煤系烃源岩、向上切穿古近系膏泥岩封闭层延伸至地表,使得古近系底-下白垩统超压体系砂岩处于半开放的流体流动环境,既可使下伏烃源岩层系含有机酸的流体注入,又可使溶蚀产物向上排出,由此导致溶蚀孔隙的形成,溶蚀孔隙度平均约4·25%。相比之下,克拉1和克拉3构造为断层转折/滑脱褶皱,相关断层沿膏泥岩层面滑脱,没有切穿膏泥岩封闭层,使得古近系底-下白垩统超压体系砂岩处于相对封闭的流体环境,不利于溶蚀作用的发生与溶蚀孔隙的形成。
Through the recognition of three adjacent anticline overpressure fluid discharge channels, dissolution of sandstone and dissolution of sandstone on the karstuo open anticline in the Kuqa Depression of Kuqa Depression, it is shown that the formation of dissolution pores in overpressured sandstones And overpressure fluid discharge channel is closely related. Craton 2 is fault-propagating fold, and the related faults communicate downwardly with the Jurassic coal-based source rocks, which are upwardly cut through the Paleogene gypsum-mudstone sealing layer and extend to the surface so that the Paleogene Bottom-Lower Cretaceous overpressured sandstone is in The semi-open fluid flow environment can inject the organic acid-containing fluid into the underlying source rock strata and cause the dissolution products to be discharged upward, resulting in the formation of dissolved pores with an average porosity of about 4.25%. In contrast, Carat 1 and Carat 3 are fault-turning / detachment folds, and the related faults slip along the gypsum and mudstone layers, and do not cut through the gypsum sealing layer, making the Paleogene Bottom-Lower Cretaceous overpressured sandstone relatively closed The fluid environment is not conducive to the dissolution and dissolution of the formation of pores.