低阻致密气藏多学科融合气水解释评价技术  

Multidisciplinary integrated gas-water interpretation and evaluation technology for low-resistance tight gas reservoirs

作　　者：光友会 张子为[2] 彭述兴 郑丽君 GUANG Youhui;ZHANG Ziwei;PENG Shuxing;ZHENG Lijun(Research Institute of Geology,Xibu Drilling Engineering Company Ltd.,CNPC,Karamay 834000,China;No.1 Gas Production Plant,Changqing Oilfield Company,PetroChina,Jingbian 718500,China;No.4 Oil Production Plant,Changqing Oilfield Company,PetroChina,Jingbian 718500,China)

机构地区：[1]中国石油西部钻探地质研究院,新疆克拉玛依834000 [2]中国石油长庆油田分公司第一采气厂,陕西靖边718500 [3]中国石油长庆油田分公司第四采油厂,陕西靖边718500

出　　处：《断块油气田》2022年第4期508-513,共6页Fault-Block Oil & Gas Field

基　　金：国家科技重大专项课题“大型油气田及煤层气开发”(2016ZX05047-001)。

摘　　要：苏里格西区致密砂岩气藏储层非均质性强,孔隙结构复杂,低阻气层广泛分布,气、水关系复杂,水气比高,无明显分布规律,投产气井产水占比较高,常规气水解释方法符合率低、局限性大。利用地质、试采、测录井等资料综合对研究区储层的含气性进行定性评价,建立了常规解释方法。结果表明:气水分异受储层物性、孔隙结构影响较大,单一参数无明显界限。综合分析储层含气性对测、录井参数的影响,构建多因素参数,创建了“QT-AC交会面”、“挖掘效应”、“气测交会面”、“气测充填系数”4个敏感参数,并进行归一化处理。综合孔隙度、含气饱和度及敏感参数,采用Fisher判别法设立判别函数,建立了气水解释模型,综合解释符合率为84.55%,气层解释符合率为95.08%。经现场应用,与新钻井试气结论吻合较好,该模型满足生产需求。The tight sandstone gas reservoir in the western Sulige area has strong heterogeneity,complex pore structure,widely distributed low-resistance gas layers,complex gas-water relationship,high water-gas ratio,and no obvious distribution pattern.There were many gas wells of produced water in study area that accounts for a relatively high proportion,and the conventional gas-water interpretation method has a low coincidence rate and large limitations.The gas-bearing properties of the reservoirs in the study area were qualitatively evaluated by using the data of geology,test production and well logging,and a conventional interpretation method was established.The results show that pore structure and reservoir physical property has a great influence on gas-water differentiation,and there was no obvious limit for a single parameter.The influence of reservoir gas-bearing properties on well logging data were comprehensively analyzed,and multi-factor parameters were constructed.4 sensitive parameters such as"QT-AC envelope surface","excavation effect","gas measurement intersection",and"gas measurement filling coefficient"were created and normalized.Conbined porosity,gas saturation and sensitive parameters,Fisher′s discriminant method was used to set up a discriminant function,and a gas-water interpretation model was established.The comprehensive interpretation coincidence rate of model was up to 84.55%,and interpretation coincidence rate for gas layer was up to 95.08%.The interpretation results were in good agreement with gas testing conclusion of newly drilled well in field application test.The model meets the production requirements.

关 键 词：低阻 致密气藏 多学科融合 气水解释 苏里格西区 

分 类 号：TE132.14[石油与天然气工程—油气勘探]