西湖凹陷平湖斜坡A潜山储层特征与裂缝预测  

Reservoir Characteristics and Fracture Prediction of Buried Hill A in Pinghu Slope of Xihu Sag

作　　者：李磊 李宁 尹文笋 张武 何新建 LI Lei;LI Ning;YIN Wensun;ZHANG Wu;HE Xinjian(Shanghai Branch of CNOOC(China)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：《海洋石油》2024年第2期22-28,共7页Offshore Oil

摘　　要：西湖凹陷作为东海富生烃凹陷之一,其潜山领域具有良好的勘探潜力。A潜山位于西湖凹陷平湖斜坡,其潜山内幕储层特征复杂,非均质性强,弹性参数叠置,常规方法无法精细刻画潜山储层,制约了潜山勘探进程。该文利用钻井、岩心、分析化验及地震资料开展潜山内幕结构及储层类型分析,同时在地质模式的指导下,采用叠前方位各向异性及正演模拟方法对优质潜山储层开展预测。研究结果认为A潜山储层垂向上具有典型的二元结构,自上而下划分为风化裂缝带和内幕裂缝带,内幕裂缝带又可划分为强内幕裂缝带和弱内幕裂缝带。叠前方位各向异性裂缝预测表明风化裂缝带储层优于内幕裂缝带,潜山翼部储层优于潜山顶部储层,A潜山翼部风化裂缝带是有利的勘探方向。As one of the hydrocarbon-rich sags in East China Sea,Xihu Sag has good exploration potential in the buried hill area.Buried hill"A"is located in Pinghu slope of Xihu Sag,the reservoir of the inner buried hill has complex features,strong heterogeneity and stacking elastic parameters.The conventional methods cannot accurately describe the buried hill reservoir,which restricts the exploration process of the buried hill.In this artical,the internal structure and reservoir types of the buried hill are analyzed based on the utilization of drilling,rock core,analysis assay and seismic data.Pre-stack azimuthal anisotropy and forward simulation methods are used to predict high quality reservoir in the buried hill under the guidance of geological model.It is considered that buried hill"A"reservoir has a typical dual structure in the vertical direction,which is divided into the weathering zone and the internal fracture zone from top to bottom.Furthermore,the internal fracture zone is divided into strong and weak zones.The fracture prediction of pre-stack azimuthal anisotropy shows that the reservoir of the weathering fracture zone is better than that of the inner fracture zone,and the reservoir of the buried hill wing is better than that of the buried hill top.The weathering fracture zone of buried hill"A"wing is the favorable exploration direction.

关 键 词：潜山储层 构造裂缝 叠前方位各向异性 

分 类 号：P631.4[天文地球—地质矿产勘探]