地质统计学反演在储层预测中的应用——以WSD区P_3w为例  

Application of geostatistical inversion in reservoir prediction:In WSD area,Upper Wuerhe Formation as an example

作　　者：蔡伟祥 夏振宇[3] 马楠 杨亚华[2,4] 桂志先[2,4] 汪勇[2,4] CAI Wei-xiang;XIA Zhen-yu;MA Nan;YANG Ya-hua;GUI Zhi-xian;WANG Yong(Sinopec Chongqing Fuling Shale Gas Exploration and Production Corporation, Chongqing 408014, China;Hubei University of Science and Technology, Hubei Xianning 437000, China;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education, Yangtze University, Hubei, Wuhan 430100, China;School of Geophysics ＆ Oil Resources, Yangtze University, Hubei, Wuhan 430100, China)

机构地区：[1]中石化重庆涪陵页岩气勘探开发有限公司,重庆408014 [2]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [3]湖北科技学院,湖北咸宁437000 [4]长江大学地球物理与石油资源学院,武汉430100

出　　处：《地球物理学进展》2018年第2期554-561,共8页Progress in Geophysics

基　　金：国家自然科学基金(41074104);国家科技重大专项(2011ZX05006-004)联合资助

摘　　要：研究区发育砂砾岩储层,一般由多期扇体叠置而成,横向变化快,非均质性强,因而给储层预测带来了困难.常规约束稀疏脉冲反演受制于地震频带,纵向分辨率不足,无法清晰地展现出砂体的叠置关系,因此本文确定了以地质统计学反演为核心的储层预测方法重点对WSD区P_3w_1~2段油组进行储层预测综合研究.首先对基础数据(井数据、地震数据、储层敏感参数、合成记录、子波等)进行质控,确定储层预测的可行性,其次根据井资料、约束稀疏脉冲反演结果以及对该区沉积模式与岩性展布的初步认识,求取地质统计学反演参数,针对研究对象进行地质统计学反演和储层砂体厚度的计算,同时对两种反演方法进行对比分析,然后对反演结果、储层砂体平面分布情况以及沉积微相平面展布特征进行综合研究分析,最后从平面、剖面两个角度对反演结果分别进行定性、定量地验证分析,证明反演结果的可靠性.研究表明地质统计学反演在WSD区具有一定的适用性,为该区有利区的优选和评价提供了依据,同时也为冲积扇储层预测提供了有效的方法.The study area develops sand-conglomerate reservoir,generally superimposed of multiphase fans,with the characteristics of fast lateral variation and serious heterogeneity,therefore,it brings difficulties for the reservoir prediction.As the limited earthquake-band of conventional constrained sparse pulse inversion cannot depict the superimposed relationship of sand bodies clearly,geostatistical inversion was applied to P3w1^2 Member oil groups of Upper Wuerhe Formation in WSD area for comprehensive analysis of reservoir prediction.Firstly,the feasibility of reservoir prediction was confirmed on the basis of the quality control for the basic data（well data,seismic data,reservoir sensitive parameter,synthetic record,wavelet,et al）,secondly,On the basis of well data,constrained sparse pulse inversion result and the preliminary understanding of sedimentary mode and lithologic distribution in the area,geostatistical parameters were calculated for the geostatistical inversion and calculation of reservoir sand body thickness,meanwhile,these two kinds of inversion method were contrasted and analyzed,then,comprehensive analysis of the inversion results and the planar distribution characteristics of reservoirs and sedimentary microfacies,finally,In order to prove the reliability of inversion result,the inversion result was verified and analyzed qualitatively and quantitatively from the plane and profile.Researches show that geostatistical inversion has certain applicability and can provide the basis for optimization and evaluation of the advantageous area in WSD area,meanwhile,Providing an effective method for the alluvial fan reservoir prediction.

关 键 词：砂砾岩储层 储层预测 约束稀疏脉冲反演 地质统计学反演 沉积模式 

分 类 号：P631[天文地球—地质矿产勘探]