基于动态有效应力系数的地层压力估算方法  

Formation Pressure Estimation Method Based on Dynamic Effective Stress Coefficient

作　　者：周云秋 贺锡雷[1] 林凯[1] 秦思萍 张陈强 刘宗杰 ZHOU Yunqiu;HE Xilei;LIN Kai;QIN Siping;ZHANG Chenqiang;LIU Zongjie(MOE Key Laboratory of Earth Exploration&Information Techniques,Chengdu University of Technology,Chengdu,Sichuan 610000,China;No.7 Geological Brigade,Shandong Geological and Mineral Exploration&Development Bureau,Linyi,Shandong 276400,China)

机构地区：[1]成都理工大学地球勘探与信息技术教育部重点实验室,成都610000 [2]山东省地质矿产勘查开发局第七地质大队,山东临沂276400

出　　处：《新疆石油地质》2023年第2期245-251,共7页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(41374111)。

摘　　要：地层压力可反映地下岩层孔隙度、压实情况、流体赋存状态等,对于寻找有效储集层十分重要。针对目前计算地层压力时将有效应力系数简化为1的情况,以统一岩石骨架模型及Gassmann方程为基础,计算出含孔隙结构参数的动态有效应力系数,结合常规Eaton法实现地层压力及压力系数的估算,提高地层压力的预测精度。以碳酸盐岩及砂岩储集层为例,估算的地层压力在水层、油层、气层等均出现异常高值,比常规Eaton法计算结果的精确度更高,寻找的有效储集层更可靠。Formation pressure which can reflect porosity,compaction,and fluid occurrence of underground rock formation is very important for discovering effective reservoirs.Regarding the status that the effective stress coefficient is set as 1 for simplification when calculating formation pressure,the dynamic effective stress coefficient considering pore structure parameters is calculated based on a unified rock skel⁃eton model and the Gassmann equation,formation pressure and pressure coefficient are estimated by using the conventional Eaton method,and the accuracy of formation pressure estimation is improved.Taking carbonate and sandstone reservoirs as examples,the estimated forma⁃tion pressures show anomalies in water layers,dry layers,and gas layers.Compared with the results obtained from the conventional Eaton method,the proposed method provides a more accurate estimate of formation pressure,thus facilitating a more reliable discovery of effec⁃tive reservoirs.

关 键 词：有效应力系数 孔隙结构参数 地层压力 Eaton法 GASSMANN方程 统一岩石骨架模型 储集层 

分 类 号：TE112.23[石油与天然气工程—油气勘探]