利用弹性参数叠合相控边界识别气水分布——以中江气田沙溪庙组气藏为例  

Using Elastic Parameters Superposition Facies-constrained Boundaries to Identify Gas-water Distribution——A Case in Shaximiao Reservoir of Zhongjiang Gas Field

作　　者：姜镭[1] 许多[1] 肖维德[1] 杨振武[1] 李曙光[1] 

机构地区：[1]中国石油化工股份有限公司西南油气分公司勘探开发研究院,四川成都610041

出　　处：《工程地球物理学报》2017年第4期379-385,共7页Chinese Journal of Engineering Geophysics

基　　金：国家科技重大专项(编号:2016ZX05002-004-005)

摘　　要：中江气田沙溪庙组气藏河道砂岩型储层气水关系复杂,叠后气水识别困难,然而叠前弹性参数在河道型储层气水识别中具有较好的预测效果。根据测井岩石物理分析发现,目的层河道砂岩储层纵横波速度比具有较高的含气敏感性。因此,首先通过叠后纵波阻抗刻画河道外形特征,结合连井对比,划分河道砂组沉积微相。然后采用叠前扩展弹性参数反演得到储层弹性参数,在河道相控模式下用泥质含量预测河道岩性,在砂岩相内预测储层孔隙度,并根据储层含水饱和度关系定量划分河道砂岩纵横波速度比。最后,建立岩相-物相-流体相的相控储层气水预测标准,对储层进行气水综合识别。结果表明,该技术应用于中江气田沙溪庙组河道砂岩型储层,预测结果与钻井资料吻合度较高,效果明显。The gas-water relationship of the channel sandstone reservoirs of Shaximiao formation in the Zhongjiang gas field is complex,so the identification of poststack gas-water is difficult.However,the pre-stack elastic parameters have a better predicting effect in gas-water identification of channel sandstone reservoirs.The physical analysis of logging rock shows VP/VShas a high gas-sensitivity in channel sandstone reservoir.Therefore,firstly,the channel shape features are characterized by poststack p-wave impedance and the sedimentary microfacies of the channel sand group are divided with the combination of well-tie comparison.Then,the elastic parameters of reservoirs are obtained by extending elastic impedance inversion.Next,it predicts lithology of channels by using shale content under channel facies constrained,and predicts porosity of sandstone in lithology facies.Based on the relation of reservoir water saturation,the VP/VSratio of channel sandstone is quantitatively divided.Finally,the predication standard of lithologic facies-petro-physical facies-liquid facies is established to identify comprehensively gas-water reservoir.This technique is applied to channel sandstone reservoirs of Shaximiao formation in the Zhongjiang gas field,which shows that the prediction results are better matched with drilling information.

关 键 词：叠前弹性参数 纵横波速度比 河道砂岩 相控 气水识别 

分 类 号：P631.8[天文地球—地质矿产勘探]