叠前弹性参数反演及FFP分析技术在东海A气田开发中的应用  

Application of pre-stack elastic parameters inversion and FFP analysis techniques in the exploitation of A gas field,East China Sea

作　　者：李炳颖 王伟 黄鑫 陈波 张锡楠 LI Bingying;WANG Wei;HUANG Xin;CHEN Bo;ZHANG Xinan(Shanghai Branch of CNOOC Ltd., Shanghai 200335, China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《中国地质调查》2020年第2期101-108,共8页Geological Survey of China

基　　金：国家科技重大专项“东海厚层非均质性大型气田有效开发关键技术(编号:2016ZX05027-004)”课题资助。

摘　　要：东海盆地西湖凹陷A气田主力储层为浅水三角洲分流河道沉积砂体,储层横向变化快,非均质性强,实施开发井存在较大风险,且目的层段砂岩与泥岩纵波阻抗值叠置,基于叠后地震的属性分析及纵波阻抗反演技术无法区分岩性和进行烃类检测。在岩石物理分析确定岩性和流体敏感弹性参数的基础上,基于叠前弹性参数反演技术对岩性进行预测,进而通过基于多个弹性参数的FFP(Facies Fluids Probabilities)分析技术对含油气砂岩概率进行定量预测。2项技术在A气田开发中取得了良好应用效果通过纵横波速比(vp/vs)参数反演,清晰刻画了主力层河道砂体形态,据此指导水平井优化并获得高达95%的高砂岩钻遇率;通过vp/vs和纵波阻抗双参数联合的FFP分析技术预测了含气砂岩空间概率分布,据此预测了潜力气层并指导调整井成功挖潜。这2项技术对于东海油气田砂泥波阻抗叠置区的储层精细描述、油气潜力预测具有良好的推广应用价值。The main reservoirs of A gas field in Xihu sag of East China Sea Basin are sand bodies deposited by distributary channels of the shallow delta,with quick lateral variation and strong heterogeneity.Therefore,it is risky in the implementation of development wells.Moreover,the P-wave impedance values of sandstone and shale in the target layer are superimposed,so it is impossible to distinguish the lithology and detect hydrocarbon based on the attribute analysis of post-stack seismic and P-wave impedance inversion technology.Based on the determination of lithology and fluid sensitive elastic parameters by rock physics analysis,the authors predicted the lithology by the pre-stack elastic parameter inversion technology,and quantitatively predicted the probability of hydrocarbons by FFP analysis technology.These two techniques have achieved good results in the development of A gas field.The main channel sand body shape was clearly depicted by the vp/vs obtained from pre-stack inversion,which guided the optimization of horizontal well and resulted in high sandstone penetration rate of 95%.The spatial probability distribution of gas-bearing sand bodies as predicted by FFP analysis based on the combination of vp/vs and P-wave impedance,so the potential gas reservoirs were predicted and the adjustment well was guided to tap the potential gas successfully.These two techniques have good application value for reservoir description and potential hydrocarbon prediction of P-wave impedance superimposed reservoirs in the oil and gas field of East China Sea.

关 键 词：叠前弹性参数反演 FFP分析 储层预测 烃类检测 

分 类 号：P631.4[天文地球—地质矿产勘探] P618.130.2[天文地球—地质学]