塔里木盆地库车坳陷储层裂缝分布规律

RESERVOIR FRACTURE DISTRIBUTION LAW OF KUCHE DEPRESSION IN TALIMU BASIN

根据岩心、测井和露头区资料 ,对塔里木盆地库车坳陷储层裂缝的分布特征进行了综合分析 ,并利用数值模拟方法 ,对白垩系储层裂缝的发育规律进行了预测。该区主要发育有北西向、北东向和近南北向中高角度构造裂缝。纵向上 ,以三叠系、下侏罗统阿合组、下白垩统巴什基其克组和古近系库姆格列木群裂缝发育 ,裂缝的发育程度受岩性和层厚控制。在平面上 ,下白垩统裂缝发育区主要分布在克拉苏—依奇克里克构造带 ,古近系裂缝发育区主要分布在克拉苏—大北一带 ,在依南构造带 ,三叠系、中下侏罗统和新近系吉迪克组裂缝也比较发育。

The reservoir fracture development characteristics of Kuche Depression in Talimu Basin were comprehensively analyzed in light of the core, log and outcrop data and the Cretaceous reservoir fracture distribution law was predicted by use of numerical simulation method. There are northwest-southeast, northeast-southwest and approximate north-south tectonic fractures with medium-high dip angles in the depression. Vertically, the fractures are well developed in the Triassic, the Ahe Formation of Lower Jurassic, the Bashijiqike Formation of Lower Cretaceous and the Kumugeliemu Group of Lower Tertiary and the degree of development of fractures is controlled by the lithology and thickness of stata. Laterally, the Lower Cretaceous fracture development area is mainly distributed in Kelasu - Yiqikelike structural belt; the Lower Tertiary fracture development area in Kelasu - Dabei structural belt; and, in Yinan structural belt, the fractures are relatively developed in the Triassic, the Middle-Lower Jurassic and the Jidike Formation of Upper Tertiary.