滨里海盆地东缘中区块东南部石炭系KT-Ⅱ滩相薄储层综合预测  

Comprehensive Prediction of Carboniferous KT-ⅡShoal Thin Reservoirs in the Southeastern Part of the Middle Block of the Eastern Margin of the Pre-caspian Basin

作　　者：吴嘉鹏 程晓东 范乐元 韩桂芹 戴婉薇 李洋 陈挚 WU Jia-peng;CHEGN Xiao-dong;FAN Le-yuan;HAN Gui-qin;DAI Wan-wei;LI Yang;CHEN Zhi(International Company of China National Logging Corporation,CNPC,Beijing 100101,China)

机构地区：[1]中国石油集团测井有限公司国际公司,北京100101

出　　处：《科学技术与工程》2022年第35期15506-15517,共12页Science Technology and Engineering

基　　金：中石油集团科技项目(2021DJ3402);中石油测井公司科技项目(CNLC2022-10D03,CNLC2022-10D02,CPL2021-D04)。

摘　　要：滨里海盆地东缘中区块东南部石炭系KT-Ⅱ滩相储层厚度薄、横向变化快、非均质性强。利用地震、测井、岩心资料,以滩相储层评价研究为指导,综合运用敏感属性及地质统计学反演方法,进行薄储层预测。研究区KT-Ⅱ滩相储层划分为孔隙型、裂缝-孔隙型及孔洞缝型3类,以孔隙型为主,有效储层孔隙度下限为4%。滩相沉积表现为中弱振幅、低频地震反射特征,首先优选均方根振幅、瞬时频率、有效带宽等敏感地震属性,通过优选属性聚类,定性预测储层分布;之后,结合储层评价研究结果,通过基于马尔科夫链-蒙特卡洛(Markov chain-Monte Carlo,MCMC)算法的高分辨率地质统计学反演、云变换与地质统计学协模拟,刻画有效薄储层展布,反演结果纵向分辨率高,井间横向变化合理,真实地反映了碳酸盐岩储层变化特征。薄储层综合预测结果表明,滩相储层主要分布于研究区东侧,研究成果成功指导X-7探井钻探,实钻获得高产油流,并指出研究区东南侧为下一步勘探有利区域。The Carboniferous KT-Ⅱshoal facies reservoirs in the southeastern part of the middle block of the eastern margin of the Pre-Caspian Basin are characterized by small thickness,rapid lateral change and strong heterogeneity.Guided by evaluation of shoal facies reservoirs,thin reservoirs were predicted by using seismic,logging and core data and with the sensitive attributes and geostatistical inversion methods.The KT-II shoal facies reservoirs in the study area were divided into the porous type,fracture-pore type and pore-vug-fracture type and are dominated by the porous type.The lower limit of porosity for the effective reservoirs was 4%.The shoal facies deposits were characterized by medium-weak amplitude and low-frequency seismic reflection.First,sensitive seismic attributes such as root mean square amplitude,instantaneous frequency,and effective bandwidth were selected,and the reservoir distribution was predicted qualitatively through clustering of optimized attributes.Then,high resolution geostatistical inversion and cloud transformation and geostatistical co-simulation were carried out based on the Markov chain-Monte Carlo algorithm(MCMC),and the effective thin reservoir distribution was described by integrating the reservoir evaluation result.The inversion result has the high longitudinal resolution and shows reasonably the lateral variation between wells,and it reflects the variation characteristics of carbonate reservoirs.The prediction results show that the shoal facies reservoirs are mainly distributed in the east side of the study area.The results provide guide for drilling of exploratory well X-7,and the high yield oil flow has been obtained.It is proposed that the favorable area for further exploration is targeted at the southeast of the study area.

关 键 词：滨里海盆地 薄储层 地震属性 地质统计学反演 储层预测 

分 类 号：P631.4[天文地球—地质矿产勘探]