苏里格气田盒8段致密砂岩储层临界物性研究  

Critical physical properties of tight sandstone reservoir of He 8 Member in Sulige Gas Field

作　　者：刘柯明 候英杰 邓航 孙玉华 常鹏 魏举行 郑浩权 LIU Keming;HOU Yingjie;DENG Hang;SUN Yuhua;CHANG Peng;WEI Juxing;ZHENG Haoquan(College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;No.5 Gas Production Plant,Changqing Oilfield Branch,PetroChina,Ordos 716000,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;Zhongyuan Measurement and Control Company,Sinopec Matrix Corporation,Puyang 457001,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油长庆油田分公司第五采气厂,内蒙古鄂尔多斯716000 [3]中国石化石油勘探开发研究院,北京100083 [4]中石化经纬有限公司中原测控公司,河南濮阳457001

出　　处：《断块油气田》2024年第5期771-777,共7页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项专题“致密气资源潜力评价、富集规律与有利区带优选”(2016ZX05047001-002-002)。

摘　　要：随着勘探程度的不断深入,储层动态评价体系越来越受到重视,对成藏期储层临界物性的确定可为储层动态评价和致密砂岩气的开采提供重要依据。文中运用录井、测井、试气、物性等资料,提出了确定成藏期致密砂岩储层临界物性的新方法;利用孔隙度压实剖面回推法和天然气充注物理模拟,结合储层现今含气物性下限,确定了成藏期储层临界物性值。研究结果表明:苏里格气田盒8段储层平均孔隙度变化量为3.3%,成藏期储层临界孔隙度为6.1%;天然气充注物理模拟证实,突破压力随着埋深的增加而增大,埋深越大,越难充注,天然气注入储层需要的动力也越大,这表明天然气在成藏期充注时存在一个物性下限;实验证实了天然气临界充注压力主要受渗透率控制,与孔隙度相关性较差,成藏期储层临界渗透率约为0.15×10^(-3)μm^(2)。With the deepening of exploration,more and more attention has been paid to the reservoir dynamic evaluation system.The determination of the critical physical properties of the reservoir in the accumulation period can provide an important basis for reservoir dynamic evaluation and tight sandstone gas exploitation.A new method for determining critical physical properties of tight sandstone reservoirs in the accumulation period is proposed by using the data of mud-logging,logging,gas testing and physical properties.Combined with the current lower limit of gas-bearing physical properties,the critical physical properties value of the reservoir in the accumulation period are determined by using push-back method of porosity compaction profile and physical simulation of natural gas charging.The results show that,the average porosity variation of He 8 Member reservoir of Sulige Gas Field is 3.3%,and the critical porosity of the reservoir in the accumulation period is 6.1%.The gas charging physical simulation confirms that the breakthrough pressure increases with the increase of burial depth.The larger the burial depth,the more difficult to charge,and the greater the power required for natural gas to be injected into the reservoir,which also indicates that there is a lower limit of physical properties when natural gas is charged in the accumulation period.The experiment verifies that the critical charging pressure of natural gas is mainly controlled by permeability and has poor correlation with porosity.The critical permeability of the eservoir in the accumu lation period is about 0.15×10^(-3)μm^(2).

关 键 词：致密砂岩气 临界孔隙度 临界渗透率 下石盒子组 鄂尔多斯盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]