基于分形理论的致密砂岩渗透率预测模型  

Fractal-based Permeability Prediction Model for Tight Sandstone

作　　者：宋泽章 吕明阳 赵力彬[3] 张月巧[4] 何元元[3] 姜福杰[1,2] 杨振中 陈伟业 霍利娜 王锐[3] 梁骁[3] SONG ZeZhang;LÜMingYang;ZHAO LiBin;ZHANG YueQiao;HE YuanYuan;JIANG FuJie;YANG ZhenZhong;CHEN WeiYe;HUO LiNa;WANG Rui;LIANG Xiao(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijng),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijng),Beijing 102249,China;Research Institute of Petroleum Exploration&Development,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China;Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [4]中国石油勘探开发研究院,北京100083

出　　处：《沉积学报》2023年第6期1847-1858,共12页Acta Sedimentologica Sinica

基　　金：中石油科技创新基金项目(2021DQ02-0105);国家自然科学基金项目(41802148);四川科力特油气技术服务有限公司科技专项项目(SCKLT-JSZS-2022-0044);中国石油天然气股份有限公司塔里木油田分公司科技专项项目(TXN011020120001)。

摘　　要：渗透率是决定致密砂岩储层渗流能力并最终决定产能的关键因素。[目的]由于致密砂岩储层孔隙结构复杂、非均质性强,其渗透率变化范围大,预测困难,亟需开发适用于致密砂岩的渗透率预测模型。[方法]以塔里木盆地库车坳陷KS2气藏白垩系巴什基奇克组致密砂岩为研究对象,综合物性测试、薄片鉴定、扫描电镜成像分析、高压压汞技术、核磁共振技术及分形理论,对致密砂岩孔隙结构进行定性、定量表征。[结果]基于分形理论,充分考虑孔隙结构非均质性对渗透率的影响,提出了两个新的、基于分形理论的致密砂岩渗透率预测模型。[结论]与rapex渗透率预测模型相比,r20分形模型、SDR((>40))分形模型的渗透率预测精度分别提升了42%与20%。Permeability is a key factor that determines the seepage capacity of tight sandstone reservoirs and ultimate-ly determines productivity.[Objective]Owing to the complex pore structure and strong heterogeneity of tight sand-stone reservoirs,the permeability exhibits significant variation and is difficult to predict.Thus,it is urgent to develop a permeability prediction model suitable for tight sandstones.[Methods]Taking the Cretaceous Bashijiqike tight sandstone in the Keshen2 gas reservoir of the Kuqa Depression of the Tarim Basin as the research object,,we qualita-tively and quantitatively characterized the pore structure of tight sandstones by integrating routine physical analysis,microscopic observation based on thin section and scanning electron microscope,high-pressure mercury injection,nuclear magnetic resonance and fractal theory.[Results]Based on fractal theory and fully considering the influence of pore structure heterogeneity on permeability,two novel tight sandstone permeability prediction models based on fractal theory were proposed.[Conclusion]Compared with the rapexpermeability prediction model,the permeability prediction accuracy of the r20fractal model and the SDR(>40)fractal model increased by 42%and 20%,respectively.

关 键 词：致密砂岩 高压压汞 核磁共振 分形维数 孔隙结构 渗透率 

分 类 号：P618.13[天文地球—矿床学]