车西地区湖底扇沉积特征及储集物性

Sedimentary characteristics and reservoir property of sublacustrine fan in Chexi Area

张 鹏 罗 霞 苏朝光 张营革 牟 敏

胜利油田分公司物探研究院，山东 东营 257022 中国石油大学资源与信息学院，北京 102249

Geophysical Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257022, China College of Geo-Resources and Information, China University of Petroleum, Beijing 102249, China

湖底扇是车西地区北部陡坡带及洼陷带的一种重要的沉积类型，根据其成因机制上的差异，分为滑塌浊积扇和深水浊积扇两种类型，二者在沉积特征及地震反射特征等方面均有所差异。扇体的储集空间以次生溶孔为主，微裂缝起到重要的连通作用，属中低孔、低渗储层。储层物性受岩性组合、溶蚀作用、沉积相带及异常高压的影响，其中溶蚀作用及异常高压有效地改善了储集物性。勘探实践表明，扇体生、储、盖配置好、油气充满度高，具有较大的勘探价值。

Sublacustrine fan is an important sedimentation type in the steep slope zone and sag zone in the north of Chexi Area. According to the difference of genesis mechanism, it is further divided into the slump turbidite fan and deep-water turbidite fan because they have some differences in the respects of seismic reflection characteristics and depositional characteristics. The reservoir spaces are mainly the secondary dissolved pores, which are connected by microcracks. There are the moderatelow porosity and low permeability in the reservoirs. The reservoir physical property is mainly dominated by lithologic combination, dissolution, sedimentary facies and abnormal pressure, in which the dissolution and abnormal pressure have
effectively improved the reservoir physical property. Prospecting practice indicates that there is a good allocation of sourcereservoir- seal assemblage and a high hydrocarbon fullness in the fan bodies, which has a large prospecting value.