致密油地质工程一体化评价体系研究--以鄂尔多斯盆地甘泉西部长8油藏为例  

Study on integrated evaluation system of tight oil geological engineering:a case study of Chang 8 reservoir in western Ganquan area,Ordos Basin

作　　者：杨连如 李锦锋 孙继继 王茜 吴彦君 任颖惠 YANG LianRu;LI JinFeng;SUN JiJi;WANG Qian;WU YanJun;REN YinHui(Development Section of Xiasiwan Oilfield,Yanchang Petroleum(Group)Co.,Ltd.,Yan'an 716000,China;School of Petroleum Engineering and Environmental Engineering,Yan'an University,Yan'an 716000,China)

机构地区：[1]延长油田股份有限公司下寺湾采油厂,延安716000 [2]延安大学石油工程与环境工程学院,延安716000

出　　处：《地球物理学进展》2025年第1期166-175,共10页Progress in Geophysics

基　　金：延长油田股份有限公司项目(ycsy2023ky-C-01-07)资助.

摘　　要：地质工程一体化是致密油高效开发的关键技术之一,在甘泉西部延长组下组合长8段致密油开发过程中发挥了十分重要作用,但在该区块尚未形成地质甜点区和工程甜点区的评价标准,制约了下一步油气的勘探开发方案部署.为此,利用测井资料开展研究区长8段储层油层识别,从烃源岩、成岩相、油藏分布特征方面,形成地质甜点区评价指标体系;从脆性指数、岩石应力应变实验、岩石拉伸破裂实验,建立了工程甜点区评价指标.研究表明:(1)微差分析法和流体敏感参数法对研究区长8段储层流体性质识别精度可达90%;(2)砂厚、油层厚度、沉积相、孔隙度、成岩相、TOCH参数可作为致密油油藏地质甜点区的评价指标;(3)在岩石物理实验基础上,结合实际施工效果,从岩石物理参数和差异化细切割体积压裂工艺优化方面,建立了研究区长8段致密油藏工程甜点区评价指标.在地质甜点区和工程甜点区约束下,利用优化的压裂工艺参数开展施工作业,Ⅰ类储层采收率能从5.3%提高到17.3%,Ⅱ类储层只能从4.86%提高到8.19%,Ⅲ类储层只能从2.81%提高到4.95%.The integration of geological engineering is one of the key technologies for efficient development of tight oil,and plays a very important role in the development of tight oil in Chang 8 member of the lower Yanchang Formation in West Ganquan.However,the evaluation criteria for geological and engineering sweet spots have not yet been formed in this block,which restricts the deployment of future oil and gas exploration and development plans.Therefore,using logging data to identify reservoirs in Chang 8 member of the study area,the evaluation index system of geological sweet spot is formed in terms of source rock,diagenetic facies and reservoir distribution characteristics.From brittleness index,rock stress and strain test,rock tensile fracture test,the evaluation index of engineering sweet area is established.The results show that:(1)The identification accuracy of reservoir fluid properties of Chang 8 member in the study area can reach 90%by differential analysis and fluid sensitive parameter method;(2)An evaluation index of geological sweet spot area of tight oil reservoir is established based on sand thickness,reservoir thickness,sedimentary facies,porosity,diagenetic facies and TOCH parameters;(3)On the basis of petrophysical experiments and actual construction results,the evaluation indexes of the sweet spot of Chang 8 tight reservoir engineering in the study area are established from the aspects of petrophysical parameters and the optimization of differentiated fine-cut volumetric fracturing process.Under the constraint of geological sweet spot and engineering sweet spot,the recovery rate of Class I reservoir can beincreased from 5.3%to 17.3%,Class II reservoir can only be increased from 4.86%to 8.19%,and Class III reservoir can only be increased from 2.81%to 4.95%by optimizing fracturing process parameters.

关 键 词：致密油 地质工程一体化 评价指标 甘泉西部 

分 类 号：P631[天文地球—地质矿产勘探]