北部湾盆地涠洲WX油田流一段储层特征及主控因素  

Characteristics and main controlling factors of the first member of Liushagang Formation of WX Oilfield in Beibuwan Basin

作　　者：刘薇 黄开展 严恒 邹明生 LIU Wei;HUANG Kaizhan;YAN Heng;ZOU Mingsheng(Zhanjiang Branch Company,CNOOC(China)Co.,Ltd.,Zhanjiang 524057,Guangdong,China;Engineering Technology Zhanjiang Branch Company,CNOOC Energy Development Co.,Ltd.,Zhanjiang 524057,Guangdong,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中海油能源发展股份有限公司工程技术湛江分公司,广东湛江524057

出　　处：《石油地质与工程》2024年第2期1-7,共7页Petroleum Geology and Engineering

基　　金：“十四五”重大科技项目“海上油田大幅度提高采收率关键技术”课题“海上‘双高-双特高’水驱油田提高采收率油藏关键技术”(KJGG2021-0501)。

摘　　要：针对北部湾盆地涠西南凹陷WX油田流沙港组一段储层物性较差且差异大的问题,利用常规孔渗、全岩X射线衍射(XRD)、岩石薄片、扫描电镜及压汞等实验方法,对流一段储层特征进行分析,并探讨沉积和成岩作用对储层物性的影响,最终根据储层岩性和物性建立WX油田储层分级评价标准。研究表明,流一段发育滑塌浊积扇沉积,储层岩性以岩屑石英砂岩和石英砂岩为主,发育细砂岩和粉砂岩;孔隙类型主要为粒间孔、粒间溶孔、长石溶孔及晶间微孔,孔喉结构为细孔喉,储层为中孔中-低渗型。4d/5d井区流一段为优质储层发育区,其主要成因是发育辫状沟道优势沉积微相,纵向上受控于压实作用,储层埋深越浅物性越好。In response to the poor and big differences on reservoir properties in the first member of the Liushagang Formation of WX Oilfield in Weixinan Sag of Beibuwan Basin,by using conventional pore porosity and permeability,XRD,rock slice observation,scanning electron microscope and mercury intrusion porosimetry methods,microscopic characteristics are analyzed from three aspects:microscopic characteristics,sedimentation and diagenesis.Therefore,a set of reservoir classification evaluation criteria for the study area is established.The results show that slump-turbidite fan deposits developed in the first member,and the reservoir lithology is lithic quartz sandstone and quartz sandstone,mainly of fine sand and siltstone.The pore types are mainly intergranular pores,intergranular dissolved pores,feldspar dissolved pores and intercrystalline micropores,and the physical properties are mesoporous.The pore throat structure is a fine pore throat,and the reservoir is of medium-low permeability type.It is considered that the first member of the 4d/5d well area is the development area of high-quality reservoirs.Its main genesis is the development of braided channel dominat sedimentary micro-facies.Vertically controlled by compaction,the shallower the burial depth of reservoir,the better the physical properties.

关 键 词：WX油田 流一段 储层特征 储层分级评价标准 主控因素 

分 类 号：P618.13[天文地球—矿床学]