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根据大量的钻井资料及岩心、薄片分析并结合测井和生产测试资料,探讨了塔里木盆地库车坳陷大北地区白垩系巴什基奇克组储层特征及其控制因素。研究认为,库车坳陷大北地区白垩系巴什基奇克组砂岩以长石岩屑砂岩、岩屑长石砂岩为主,次为岩屑石英砂岩和岩屑砂岩;储层发育原生粒间孔、粒间溶孔、少量长石、岩屑粒内溶孔、溶蚀逢、构造缝和微孔隙等储集空间,属特低孔特低渗储集层,裂缝的异常发育为这种特低孔特低渗深部储层的高产提供了基础,在成岩阶段后期的改造作用及构造作用下,其储集条件明显变好,影响该区储层发育的控制因素有沉积微相、成岩作用、构造作用、膏岩层、异常高压和埋藏深度等,其中构造挤压和溶蚀作用是其主控因素。
Based on a large amount of drilling data, core and thin sections, and logging and production test data, the characteristics and controlling factors of the Cretaceous Bashijiqike Formation in Dabei area, the Kuqa Depression, Tarim Basin, are discussed. The study shows that the Cretaceous Bashijiqike sandstone in the Dabei area of the Kuqa Depression is dominated by feldspathic lithic sandstone and lithic feldspathic sandstone, followed by lithic quartzite sandstone and lithic sandstone. The development of primary particles Intergranular, intergranular dissolved pores, a small amount of feldspar, intracrust dissolved pores, dissolution every, structural seams and micropores and other reservoir space, is a special low permeability ultra-low permeability reservoir, the abnormal development of such cracks The reservoir of ultra-low porosity and ultra-low permeability reservoir provides the foundation for high reservoir productivity. During the later diagenesis and tectonism, the reservoir conditions are obviously better. The controlling factors affecting the reservoir development are sedimentary microfacies and diagenesis Role, tectonic action, gypsum rock, abnormal high pressure and burial depth, among which tectonic squeezing and erosion are the main controlling factors.