摘要
对于具有强非均质性的多尺度储集空间的碳酸盐岩储层,仅采用单一的测试手段难以识别出所有的储集空间。为了给碳酸盐岩油气藏精细刻画及高效开发提供技术支撑,以四川盆地西北部双鱼石构造中二叠统栖霞组白云岩储层为研究对象,针对其发育多个尺度的孔洞缝,采用岩心图像采集仪和双能CT对不同尺度岩心的孔洞缝进行刻画,借助三维可视化软件对重构孔隙空间进行定量化分析,实现了不同尺度下孔洞缝的搭配关系表征以及储集类型划分,并建立了一套基于几何学参数识别裂缝、溶洞的方法。研究结果表明:(1)该区栖霞组储层发育多个尺度的孔洞缝储集空间,可划分为3大类6种类型,孔隙以晶间溶孔、晶间孔为主,溶洞以小洞为主,裂缝以斜交缝为主;(2)建立起了一套基于几何学参数识别裂缝、溶洞的方法,球形度小于0.43、球半径比小于0.41为裂缝识别标准,等效球半径大于2 mm为溶洞识别表征;(3)栖霞组储层的孔隙以直径介于0.02~2.00 mm的大孔隙为主,溶洞以2.00~10.00mm的小洞为主,发育多个级别的裂缝;(4)栖霞组白云岩储集类型以裂缝-孔洞型、裂缝-孔隙型为主,缝洞发育程度是影响该储层物性的关键因素,栖霞组裂缝发育的储集类型占比超过50%,渗流能力较好。
As for the carbonate reservoirs with strong heterogeneity and multi-scale reservoir spaces,it is difficult to identify all the reservoir spaces using only one single test method.In order to provide technical support for a fine characterization and efficient development of carbonate oil and gas reservoirs,this paper took the dolomite reservoir of Middle Permian Qixia Formation in the Shuangyushi structure of the northwestern Sichuan Basin as the research object.Considering there are multi-scale pores,vugs and fractures developed in the reservoir,core image acquisition instrument and dual-energy CT were used to characterize pores,vugs and fractures in the cores of different scales,and the 3 D visualization software was applied to quantitatively analyze the reconstructed pore spaces.In this way,the characterization of the matching relationship of pores,vugs and fractures at different scales and the division of reservoir types were realized,and a set of methods for fracture and vug identification based on geometric parameters was developed.And the following research results were obtained.First,multi-scale reservoir spaces of pores,vugs and fractures are developed in the reservoirs of Qixia Formation in this area,and they can be divided into 6 types of 3 categories.Pores are dominated by intercrystalline dissolution pores and intergranular pores,vugs are mainly small ones,and fractures are mainly diagonal fractures.Second,a set of methods for fracture and vug identification based on geometric parameter is set up.And it takes the sphericity<0.43 and the spherical radius ratio<0.41 as the fracture identification standard and the equivalent spherical radius>2 mm as the vug identification standard.Third,the pores in the reservoirs of Qixia Formation are mainly large pores with a diameter ranging from 0.02 to 2.00 mm,the vugs are mainly small with a diameter ranging from 2.00 to 10.00 mm,and fractures of multiple scales are developed.Fourth,the Qixia Formation dolomite reservoirs are mainly of fracture-vug type and fractur
作者
王俊杰
胡勇
刘义成
何溥为
兰雪梅
文雯
WANG Junjie;HU Yong;LIU Yicheng;HE Puwei;LAN Xuemei;WEN Wen(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610000,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2020年第3期48-57,共10页
Natural Gas Industry
基金
中国石油西南油气田公司博士后科研项目“川西北部栖霞组储层渗流机理及产能控制因素研究”(编号:20180303-17)。
关键词
四川盆地西北部
中二叠世
栖霞期
碳酸盐岩
白云岩储集层
多尺度表征
几何学参数
孔洞缝搭配
Northwestern Sichuan Basin
Middle Permian
Qixia Formation
Carbonate rock
Dolomite reservoir
Multi-scale characterization
Geometric parameter
Pore-vug-fracture collocation
