准噶尔盆地东部凹陷区二叠系上乌尔禾组深层—超深层储层特征及发育模式  

Characteristics and development model of deep-ultra deep reservoirs in the Upper Wuerhe Formation of Permian in the sags of eastern Junggar Basin

作　　者：王秋玉 刘超威 闫文琦 李树博 李辉[1] 陈梦娜 李宗浩[1] WANG Qiuyu;LIU Chaowei;YAN Wenqi;LI Shubo;LI Hui;CHEN Mengna;LI Zonghao(Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《天然气地球科学》2024年第2期259-274,共16页Natural Gas Geoscience

基　　金：中国石油天然气股份有限公司前瞻性技术攻关项目(编号:2021DJ0405);中国石油天然气股份有限公司前瞻性基础性重大科技项目(编号:2022DJ0108)联合资助。

摘　　要：选取阜康凹陷和东道海子凹陷作为准噶尔盆地东部凹陷区代表,以二叠系上乌尔禾组深层—超深层砂砾岩储层为研究对象,利用岩心手标本、薄片、扫描电镜观察,结合高压压汞和测井成像等方法,分析深层—超深层砂砾岩储层特征及主控因素,进一步揭示准噶尔盆地东部凹陷区上乌尔禾组储层发育模式。结果表明:准噶尔盆地东部凹陷区均为深层—超深层砂砾岩储层,其中阜康凹陷属于典型的低孔—特低渗储层,东道海子凹陷则为低孔—低渗储层。二者储集空间类型存在差别,阜康凹陷主要发育微裂缝和溶蚀孔,东道海子凹陷存在大量溶蚀孔,少见裂缝。压实作用和胶结作用对准噶尔盆地东部地区储层均起到了强烈的破坏作用,但阜康凹陷压实作用十分强烈,溶蚀作用弱,超压产生的大量裂缝成为超深层油气运移的有效通道。东道海子凹陷裂缝欠发育,长石和浊沸石经过溶蚀作用产生的大量粒内溶蚀孔改善了储层物性。此外其富含的浊沸石还起到抗压保孔作用。因此准噶尔盆地东部凹陷区二叠系上乌尔禾组储层共发育超深层裂缝和富含浊沸石的溶蚀孔2种模式,为深层—超深层储层油气富集创造良好条件。Taking the deep-ultra deep glutenite reservoirs of the Upper Wuerhe Formation of Permian in Fukang Sag and Dongdaohaizi Sag as the research object which are the representative of eastern Junggar Basin,the char⁃acteristics and main controlling factors of deep-ultra deep glutenite reservoirs are analyzed by using cores,thin sections and scanning electron microscope observation,combined with high-pressure mercury injection and log⁃ging imaging,to further reveal the reservoir development model of the Upper Wuerhe Formation in the eastern Junggar Basin.The results show that Fukang Sag and Dongdaohaizi Sag are deep-ultra deep glutenite reser⁃voirs,of which Fukang Sag belongs to a typical low porosity to ultra-low permeability reservoir,while Dongd⁃aohaizi Sag belongs to a low porosity to low permeability reservoir.There are differences in the types of reser⁃voir spaces.Microfractures and corrosion pores are mainly developed in Fukang Sag,while a large number of corrosion pores exist in Dongdaohaizi Sag,with few fractures.Both compaction and cementation have a strong destructive effect on the reservoirs in the eastern Junggar Basin.However,the compaction effect in Fukang Sag is very strong,and the dissolution effect is weak.The large number of fractures generated by overpressure be⁃come effective channels for ultra deep oil and gas migration.The cracks in the Dongdaohaizi Sag are underdevel⁃oped,and a large number of intra-particle corrosion pores generated by dissolution of feldspar and turbidite im⁃prove the reservoir properties.In addition,its rich turbidite also plays a compressive and pore retention role.There are two types of reservoir models developed in the Upper Wuerhe Formation of Permian in the eastern Junggar Basin:the deep fracture model represented by the Fukang Sag and the solution pore model rich in turbi⁃dite in the Dongdaohaizi Sag,which create good conditions for oil and gas accumulation in the deep-ultra deep reservoirs in the depression area.

关 键 词：准噶尔盆地 二叠系上乌尔禾组 深层—超深层储层 浊沸石 地层超压 发育模式 

分 类 号：TE122.2[石油与天然气工程—油气勘探]