准噶尔盆地西北缘石炭系火山岩储层特征研究

摘要

In this paper,the characteristics of Carboniferous volcanic reservoir along the northwestern margin of Junggar Basin were analyzed using the cores,thin section,well log,assay,seismic and production perfomanee data so as to increase its productivity.The following research results were obtained.First,four volcanic lithofacies are identified,and 5 rock nasses and 3 lithofacies are classified.Among them,No.2 and No.3 rock masses are the favorable rock masses with nore oil generation.Eruptive facies and overflow facies and the volcanic breecias and basalt which are controlled by eruptive facies and overflow facies are the favorable lithofacies and lithological combinations.Second,air holes and secondary fractures are the favorable types of reservoir space,and air holes are comnunicated through fractures.Third,it is characterized by moderate porosity and low permeability.And fourth,the volcanic reservoir is controlled jointly by faults,rock masses,lithofacies and fractures.Finally,three types of favorable reservoirs were classified based on production data and seismic attributes.The research results provide the basis for the following oil and gas exploration deployment in the study area.%为提高准噶尔盆地西北缘石炭系火山岩储层的产能,利用岩心、薄片、测井、分析化验、地震资料及生产动态资料研究储层特征.结果表明:该储层可识别出4种火山岩岩性,划分出5个岩体和3种岩相,其中,2号和3号岩体是出油较多的有利岩体,爆发相和溢流相及其控制的火山角砾岩和玄武岩是有利岩相和岩性组合;气孔和次生裂缝是有利的储集空间类型,裂缝沟通气孔;物性表现为中孔、低渗;火山岩储层受断裂、岩体、岩相和裂缝的综合控制,结合生产数据和地震属性,划分出3类有利储层.该研究结果为研究区下一步油气勘探部署奠定了基础.