摘要
通过对野外露头和井下岩心构造裂缝的观察和描述，及其性质、产状、密度、强度、开度、充填程度和充填物等测量要素的观测和统计，对库车前陆冲断带山前构造裂缝发育特征及分布规律进行了综合分析。该区主要发育三组近南北走向的剪裂缝和张剪裂缝，裂缝倾角总体以大于45°的高角度缝和垂直缝为主，野外和岩心裂缝开度分别以0~5 mm和0~1mm为主，裂缝多未充填或半充填，充填物以钙质充填为主。裂缝各参数的分布呈现出东西分段，南北分带的特点，以克拉苏—依奇克里克构造带的裂缝密度和强度最高。具体到层位上，库车东部以下侏罗统阿合组裂缝最为发育，库车西部则以下白垩统巴什基齐克组砂岩的裂缝密度最高。总体上，库车坳陷构造裂缝十分发育，有益于致密储层孔渗条件的改善，有利于裂缝型油气藏的形成。
The structural fracture development characteristics of Kuqa depression in Tarim Basin are comprehensively analyzed inlight of the outcrop, core and log data. The characteristics of fractures we overserved consist of properties, attitude, density, intensity,aperture, and filling. The tectonic fractures in this area are mainly the medium-high dip angle shear fractures and include three groupsof fractures extending mostly in the N-S direction. The aperture of most outcrop and core fractures is 0~5mm and 0~1mm, respectively.The majority of fractures is unfilled or half-filled, and the filling is mainly calcite. The distribution of each parameter of fracture showsregularity in E-W and N-S direction, respectively. Laterally, the Lower Cretaceous fracture development area is mainly distributed inthe Kelasu-Yiqikelike structural belt. Vertically, the fractures are well developed in the Lower Jurassic Ahe Formation in the eastKuqa depression, and the Lower Cretaceous Bashijiqike Formation in the west Kuqa depression. Overall, the structural fracture is verywell developed in the Kuche depression, which is beneficial to the improvement of porosity and permeability of tight reservoir, and isalso beneficial to the formation of fractured hydrocarbon reservoirs.
出处
《高校地质学报》
CAS
CSCD
北大核心
2016年第4期644-656,共13页
Geological Journal of China Universities
基金
中石油塔里木油田分公司项目(041013110025)
中石油重大专项课题(2014A0213)联合资助
关键词
构造裂缝
发育特征
分布规律
库车坳陷
tectonic fractures
development characteristics
distribution regularity
Kuqa depression
