东海西湖凹陷平湖斜坡带基底潜山储层发育模式

Development model of basement buried hill reservoir in Pinghu slope belt,Xihu Sag,East China Sea

西湖凹陷是东海陆架盆地油气勘探的热点区域,随着常规平湖组油气逐步开发利用,基底潜山正逐步成为东海油气勘探的热点领域。本文综合利用岩壁心、电测曲线及分析化验资料,对平湖斜坡带基底潜山优质储层发育模式进行研究。研究表明,潜山储层岩性以花岗岩为主,储集空间以溶蚀孔缝和构造缝为主,其中构造缝作为主力储集空间,同时沟通了溶蚀孔缝。储层垂向上具有典型的二元结构,划分为风化裂缝带和内幕裂缝带。风化裂缝带储层储集物性较好,内幕裂缝带储层物性不均一性较强。本次研究为平湖斜坡基底潜山勘探指出有利方向。

The Xihu Sag is the main are of oil and gas exploration in the East China Sea continental shelf basin.Gradual development and utilization of traditional oil and gas in the Pinghu Formation.Basement-buried hills are gradually becoming popular fields for oil and gas exploration in the East China Sea.Based on core,logging curve,and reservoir analyses and testing,this study presents the reservoir characteristics and high-quality reservoir development model of a buried basement hill in the Pinghu slope zone.The reservoir of the buried hill is dominated by granite,and the reservoir space is controlled by structural fractures and dissolution pores.The structural fractures are the main reservoir spaces that connect the dissolution pores.The reservoir has a typical binary structure in the vertical direction,which is divided into weathered and inner fracture zones.The reservoir physical properties of the weathered fracture zone were better,and those of the inner fracture zone were more heterogeneous.