三塘湖盆地湖218区块西山窑组储层评价

Reser voirevaluation for Hu 218 block J2x

针对三塘湖盆地湖218区块西山窑组储层进行了研究,根据本区块地质、测井、钻井、分析化验等资料及前人研究成果,通过对该区储层岩性特征、电性、物性以及含油气性特征分析,特别对该区储层的孔隙类型进行了研究,研究认为,湖218区块的西山窑组储层,岩性以砂砾岩、粗砂岩、中砂岩、细砂岩和少量粉砂岩为主,其中中细砂岩最多。西山窑组储层物性普遍较差,总体评价为低孔特低渗储层。孔隙度主要分布在6~16%,岩心分析渗透率平均值为3.23×10-3μm2。储层储集空间类型有原生粒间孔隙、溶蚀孔(粒间溶孔、粒内溶孔)、裂缝等,其中以粒间孔为主。根据以上研究成果,对西山窑组储层进行了综合评价,将该区储层划分为I1、I2、II和III共四类储层,以I2和II类储集层为主。在此基础上预测了西山窑组储层有利的发育地区,评价结果与生产吻合较好,适合地区实际,对该区块西山窑组油藏的储层评价及产能建设等具有一定的指导作用。

This article analyzes Hu 218 block J2x2reservoir characteristics based on the data of logging,drilling,testing and the results of predecessors,thoughing study the lithologic characters,electrical property,physical properties,oil and gas possibility,especially the pore types,the studying indicates that the main lithology of Hu 218 block J2x reservoir is sandy conglomerate,gritstone,medium sandstone,finestone and little siltstone,the fine and sandstone has the most percentage。The J2 x reservoir is commonly of low porosity and extremely low permeability,the porosity is between 6~16%,the average core permeability is 3.23×10-3μm2。The main reservoir space type are intergranular pore,but there are dissolved pore(interparticle dissolution pore,intragranular dissolved pore),fracture and so on.Using a large number of data statistics and analysis,carrying out Hu 218 block J2x2reservoir evaluation research,dividing the reservoir to I1、I2、II and III totally four kind,in which the I2 and II is the main reservoir,pointing out the beneficial area for J2x2 reservoir distribution,The divided result is fit for the actual situation combined with the production performance in the region,having a certain guiding role for exploration of this area.