双南油田沙一段优质储层研究及有利区预测  

Study on Good Reservoirs and Prediction on Favorable Areas in First Member of Shahejie Formation,Shuangnan Oilfield

作　　者：刘媛媛[1] Liu Yuanyuan(Research Institute of Exploration and Development,Petro China Liaohe Oilfield Company,Panjin Liaoning 124010)

机构地区：[1]中国石油辽河油田勘探开发研究院

出　　处：《中外能源》2018年第12期49-53,共5页Sino-Global Energy

基　　金：中国石油天然气总公司攻关项目子课题“辽河坳陷增储领域地质评价与勘探实践”(编号:2016ZX05006005-002)

摘　　要：双南油田沙一段油层单井产能差异较大,探井分析储层是控制产能的重要因素。沙一段储层横向变化快。岩石组合分为两类,一类为厚层砂砾岩、中-细砂岩与厚层泥岩互层组合,砂岩单层厚度大。粒度粗,次生孔隙发育且彼此连通,可达中孔-中渗型储层,为本区优质储层;一类为细-粉砂岩与泥岩薄互层,杂基含量高,孔隙几乎不发育。岩心观察沙一段储层为具有沟道供给的湖底扇砂体,供给水道及中扇辫状沟道微相为优质储层的优势相带。为明确优势相带的分布特点,首先利用地震属性及储层反演成果确定湖底扇的外部形态,根据钻井统计,将砂岩含量40%作为湖底扇中扇及外扇亚相边界;其次采用单因素作图法,分别以砂砾岩、中-细砂岩、粉砂-泥质粉砂岩等三种粒级砂岩的含量变化确定湖底扇中扇微相的发育规律,确定优势相带的发育特点。结合本区构造特点及勘探成果分析,明确J307-J310井间、J325井东块、J325井南块为有利区,是下一步部署的首选区带。In Shuangnan Oilfield,the productivity of single well in the pays in the first member of Shahejie Formation( Es1) is quite different. One important controlling factor of the productivity is the reservoir by drilling analysis.The Es1 reservoirs vary greatly on the plane.The rock association could be classified into two types.One type is a combination of interbedded thick glutenite,medium-fine sandstone and thick mudstone.Single sandstone layer is thick with coarse grain size,well-developed and connected secondary pores.They are favorable reservoirs with medium porosity and permeability.The other type is the thin interbed of fine sand-stone and siltstone and mudstone.The rocks contain high matrix content with nearly no pores.Core observation shows that Es1 reservoirs are sublacustrine fan sand bodies sourced from the channels.These channels and mid-fan braided fluvial microfacies are dominant facies belts of good reservoirs.In order to know the distribu-tion characteristics of the dominant facies belts,firstly,external configuration of the sublacustrine fan was defined by seismic attributes and reservoir inversion results,and the boundaries of mid-fan and outer fan subfacies in the sublacustrine fan is defined by the sandstone content of 40% based on the statistics on the drilling.Secondly,development regularities of mid-fan microfacies of the sublacustrine fan are defined by the content variation of the glutenite,medium-fine sandstone and silty-argillaceous siltstone by single-factor mapping method;and finally,development characteristics of the dominant facies belt were known.Bases on the structure characteristics and analysis on exploration results in this area,all the blocks of J307-J310,eastern Well J325 and southern Well J325 were defined as favorable areas and should be developed for the next step.

关 键 词：双南油田 产能 岩石组合 优质储层 湖底扇微相 单因素作图 有利区预测 

分 类 号：TE31[石油与天然气工程—油气田开发工程]