基于岩石物理建模的页岩气地层压力地震预测方法  

Seismic prediction method for pore pressure of shale gas formation based on rock physics model

作　　者：石学文 王畅 张洞君 冯艳雯 王群武 曾勇坚 SHI Xuewen;WANG Chang;ZHANG Dongjun;FENG Yanwen;WANG Qunwu;ZENG Yongjian(Shale Gas Institute,PetroChina Southwest Oil&Gas Field Company;Sichuan Provincial Key Laboratory of Shale Gas Development and Evaluation;Southwest Geophysical Exploration Branch of PetroChina Oriental Geophysical Company;Beijing Precise Energy Technology Co.,Ltd)

机构地区：[1]中国石油西南油气田公司页岩气研究院 [2]页岩气开发与评价四川省重点实验室,四川省成都市610051 [3]中国石油东方地球物理公司西南物探分公司,四川省成都市610051 [4]北京普瑞斯安能源科技有限公司

出　　处：《海相油气地质》2025年第1期89-96,共8页Marine Origin Petroleum Geology

基　　金：中国石油天然气股份有限公司科技项目子课题“新区新层系有利区优选与勘探评价关键技术研究”(编号:2023ZZ21YJ04)资助。

摘　　要：通常地层压实背景趋势是直接通过井上趋势拟合得到,往往存在较大的误差,导致地层压力预测不准。四川盆地渝西区块深层页岩气勘探开发有利区的储层中普遍存在地层超压现象,常规的地层压力地震预测方法难以准确地获取地层压实背景趋势。通过实际测井分析,基于岩石物理理论,利用岩石物理模型构建了地层压实背景趋势,有效提高了地层压实背景趋势的建模精度。将岩石物理建模构建的正常压实背景趋势与实测参数代入体积模量方程中,实现了渝西区块地层压力的地震预测。对比结果表明,预测的地层压力参数与多口井的地层压力实测参数较为吻合,取得了良好的应用效果。Seismic prediction of formation pressure is of great significance to the evaluation of powerful gas-producing areas and exploration and development of shale oil and gas reservoirs.The study area of western Chongqing is a favorable area for exploration and development of deep shale gas.The shale gas resources in the area are abundant,and formation overpressure is common in the reservoirs.However,due to complex geological conditions,it is difficult to accurately obtain the formation compaction background trend while using conventional formation pressure seismic prediction methods,making it difficult to properly solve the seismic prediction of formation pressure.Usually,the formation compaction background trend is obtained directly through well trend fitting.The established formation compaction background often has large errors,resulting in inaccurate formation pressure prediction.Therefore,this paper constructs the formation compaction background trend through actual logging analysis,based on rock physics theory and rock physics model,which effectively improves the modeling accuracy of formation compaction background trend.By substituting the normal compaction background trend and measured parameters constructed by petrophysical modeling into the bulk modulus equation,the seismic prediction of formation pressure of the study area of western Chongqing in the Sichuan Basin is achieved,and good application results are achieved.By comparing with the actual drilling measured results,it is found that the predicted formation pressure parameters are consistent with the measured formation pressure parameters of multiple wells,indicating the applicability and accuracy of the method.

关 键 词：深层 页岩气 压实背景趋势 岩石物理建模 地层压力 地震预测 

分 类 号：TE135[石油与天然气工程—油气勘探]