柴达木盆地北缘马海东地区基岩油藏成藏条件分析  

Analysis on Accumulation Conditions of Basement Oil Pools Reservoir of Mahai East Area northernmargin of Qaidam Basin

作　　者：李军亮[1] Li Junliang(Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying 257015)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《石化技术》2023年第8期92-96,共5页Petrochemical Industry Technology

基　　金：中国石化科技攻关项目“柴达木盆地中石化区块成藏条件与勘探潜力评价”(P18054-1)和“柴达木及河西走廊地区油气资源潜力及选区评价”

摘　　要：柴达木盆地阿尔金山前基岩风化壳气藏勘探取得了重大突破,位于柴北缘马北凸起东段的马海东地区基岩勘探也获得了新发现,展现出良好勘探前景。由于对该区基岩油藏的成藏背景和关键要素缺乏系统认识,制约了勘探步伐。利用露头、岩心、分析化验、测井、试油等资料对基岩储层的基本特征及成藏条件进行分析,研究表明:马海东地区基岩发育3类9种岩性,储集空间以构造缝、溶蚀缝为主,其次为溶蚀孔,为低孔低渗储层;紧邻富烃凹陷、良好的储盖组合、有效的网状输导体系构成基岩优越的“源-断-储”配置,是基岩成藏的关键;马海东地区成藏条件最为有利,具备发育基岩风化壳构造、低位潜山断块和内幕断块等多种类型油藏的有利条件,是下步勘探的有利方向和目标类型之一。研究以期对马海东地区基岩油藏的勘探提供地质理论依据。Great breakthroughs have been made in the exploration of pre-altun gas reservoirs in the Qaidam Basin,and new discoveries have been made in the exploration of bedrock weathering crust in the Eastern part of Mabei uplift in the northern margin of Qaidam Basin,showing good exploration prospects.The lack of systematic understanding of the accumulation background and key factors of bedrock reservoirs in this area restricts the pace of exploration.The basic characteristics and reservoir-forming conditions of bedrock reservoirs are analyzed by using outcropping,core,analysis,well logging and oil testing data.The results show that there are 3 types and 9 types of lithology in the bedrock in eastern Mahaidong area.The reservoir space is mainly structural fractures and dissolution fractures,followed by dissolution pores and low porosity and low permeability reservoirs.Close to hydrocarbon rich sag,good reservoir cap combination and effective network transport system constitute the superior“source-faultreservoir”configuration of the bedrock,which is the key to the accumulation of the bedrock.Mahaidong area is the most favorable reservoir forming condition,with favorable conditions for developing various types of reservoirs such as bedrock weathering crust structure,low buried-hill fault block and inner fault block,which is one of the favorable direction and target types for the next exploration.In order to provide geological basis for the exploration of bedrock reservoir in east Mahai area.

关 键 词：成藏要素 储层特征 基岩油藏 马北凸起 

分 类 号：P618.13[天文地球—矿床学]