岩心覆压孔隙度校正探析——以琼东南盆地陵水A气田为例  

Analysis of porosity correction under rock core overburden pressure:a case study of Lingshui A gas field in the Qiongdongnan Basin

作　　者：刘东华 郇金来 陈建 张磊 赛理麦 LIU Donghua;HUAN Jinlai;CHEN Jian;ZHANG Lei;SAI Limei(Hainan Company of CNOOC(China)Co.,Ltd.,Haikou,Hainan 570312,China;Zhanjiang Company of CNOOC(China)Co.,Ltd.,Zhanjiang 524057,Guangdong,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570312 [2]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《石油地质与工程》2024年第6期54-58,共5页Petroleum Geology and Engineering

基　　金：“十三五”国家科技重大专项“琼东南盆地深水区大中型气田形成条件及勘探关键技术”(2016ZX05026-002)。

摘　　要：为了探究琼东南盆地陵水A气田黄流组Ⅰ气组高孔高渗岩石覆压孔隙度校正幅度低于相邻盆地中孔低渗砂岩的原因,通过平行覆压孔渗实验,开展岩石变形机制理论分析,结果表明:进行覆压孔隙度实验时将岩心放入橡胶制成的封套中,硬性的岩心与柔性的封套之间存在大量微间隙,低孔低渗砂岩岩心孔隙体积较小,微间隙产生的影响较大;而高孔高渗砂岩岩心孔隙体积较大,微间隙产生的影响较小,实验过程中的表皮效应致使高孔高渗岩石的覆压孔隙度校正幅度小于中孔低渗砂岩。正确解析覆压孔隙度实验有利于在储量计算过程中对有效孔隙度参数进行合理取值。In order to make clear why the correction amplitude of overburden porosity of high-porosity and high-permeability rocks in I Group of Huangliu Formation,Lingshui A gas field in Qiongdongnan Basin is lower than that of middle-porosity and low-permeability sandstone in adjacent basins,the theoretical analysis of rock deformation mechanism was conducted through parallel compression pore-permeability experiment.The results showed that during the overburden porosity experiment,the core was placed in a rubber sleeve,and there were a large number of micro-gaps between the hard core and the flexible sleeve,the pore volume of low-porosity and low-permeability sandstone was small,and the impact of micro-gaps is big.While in high-porosity and high-permeability sandstone,the pore volume is larger,the impact of micro-gaps is smaller,and the skin effect during the experiment results in a smaller correction amplitude.The accurate understanding of the overburden porosity experiment is conducive to the reasonable value of the effective porosity parameter in the process of reserve calculation.

关 键 词：琼东南盆地 黄流组 有效孔隙度 覆压孔隙度 表皮效应 

分 类 号：TE112.23[石油与天然气工程—油气勘探]