东营凹陷增压减压条件下砂岩储层物性参数的变化规律实验研究  

An Experimental Study on Sandstone Reservoir Parameters under Variable Pressures in Dongying Sag

作　　者：吴春燕[1,2] 张金功[1,2] 孙志刚[3] 张守春[3] 张津宁[1,2] 刘琳琳[1,2] 

机构地区：[1]西北大学大陆动力学国家重点实验室,山东东营257015 [2]西北大学地质学系,西安710069 [3]中国石化胜利油田分公司地质科学研究院,山东东营257015

出　　处：《地质科技情报》2016年第1期101-106,共6页Geological Science and Technology Information

基　　金：中国石化股份有限公司重大基础项目(P06086);中国地质调查局基础地质调查计划项目(12120113040700);国家自然科学基金项目(41302076)

摘　　要：为了研究砂岩储层孔隙度、渗透率、压缩系数与压力的关系以及压缩系数与孔隙度的关系,选取东营凹陷6个砂岩样品进行了增压减压实验,结果表明:砂岩孔隙度和渗透率随压力的升高而降低,随压力的降低而升高,但不会恢复到原始孔隙度和渗透率水平。低渗透储层比中高渗透储层具有更好的应力敏感性,但是降压后其渗透率恢复能力却不如中高渗透储层。砂岩的孔隙体积压缩系数随着压力的增大而降低,孔隙体积回弹系数随着压力的降低而增大,并且压缩系数随着孔隙度的增大而增大,随孔隙度的降低而降低,岩石压缩系数与孔隙度之间的关系呈二次多项式,该公式对东营凹陷油藏工程研究具有一定的指导意义。In this paper,we selected six sandstone samples in Dongying Sag to carry out pressure change ex- periment to study the sandstone reservoir porosity, permeability, compression coefficient and pressure re- lationship and the relationship between compression coefficient and porosity. The results show that the po- rosity and permeability of the sandstone decrease with increasing pressure and increase with decreasing pressure,but cannot return to the original porosity and permeability. Low permeability reservoirs have bet- ter stress sensitivity than in permeability reservoirs. However, its permeability recovery is not as good as permeability reservoirs with decreasing pressure. Sandstone pore volume compressibility decreases with in- creasing pressure, and pore volume rebound coefficient increases with decreasing pressure. The compressi- bility coefficient increases with increasing porosity and decreases with decreasing porosity. The relationship between rock compressibility coefficient and porosity is as quadratic polynomial, and the formula has some significance in reservoir engineering study for the Dongying Sag.

关 键 词：压力 孔隙度 渗透率 压缩系数 东营凹陷 

分 类 号：P618.130.21[天文地球—矿床学]