渤海湾盆地海域新近系构造岩性油气藏成藏特征及主控因素

Reservoir-forming Characteristics and Key Control Factors of Neogene Structural-lithologic Hydrocarbon Reservoirs in Bohai Bay Basin of China

渤海油气勘探历时40多年,随着勘探程度的不断提高,大型整装构造油气藏发现的难度越来越大。近年来,越来越多的新近系构造-岩性油气藏的发现已引起勘探人员的高度重视。通过对BZ29-5、BZ19-4及QHD33-1等多个已钻构造的成藏条件及主控因素分析表明:古近系生烃凹陷是新近系构造-岩性圈闭成藏的物质基础、受新构造运动影响而形成的新近系构造圈闭背景为油气聚集的前提条件、新近系明化镇组优质储盖组合是油气保存的必要条件、断层-砂体的耦合是浅层构造-岩性圈闭成藏的关键条件。

Bohai Oilfield has experienced more than 40years of oil and gas exploration,with the increasingly enhanced oil exploration altitude,it was more and more difficult for discovering large and integral structural reservoirs.In recent years,more and more of Neogene structural-lithologic reservoirs being discovered have drawn high attention from oil exploration workers.The reservoir-forming conditions and the main control factors from the drilled structures of Bozhong 29-5,Bozhong19-4and Qinhuangdao33-1Blocks were analyzed.The result indicates that hydrocarbon-enriched depression in Paleogene is the material basis of accumulation of structural-lithologic traps in Neogene;the background of structural traps in Neogene affected by the neotectonism is the prerequisites of hydrocarbon accumulation;the excellent reservoir-seal combinations of lower Minghuazhen Formation in Neogene is the necessary preservation conditions of the reservoirs;the coupling of faults and sand is critical.