尼日尔三角洲盆地深水沉积储层预测及烃类检测  

Prediction of deep water sedimentary reservoirs and hydrocarbon in Niger delta basin

作　　者：冯鑫 梁建设 韩文明 肖为 陈经覃 韩利 FENG Xin;LIANG Jianshe;HAN Wenming;XIAO Wei;CHEN Jingtan;HAN Li(CNOOC International Limited,Beijing 100028,China;China Oilfield Services Limited,Tianjin 300450,China)

机构地区：[1]中国海洋石油国际有限公司,北京100028 [2]中海油田服务股份有限公司物探事业部,天津300450

出　　处：《物探化探计算技术》2023年第2期177-186,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中海油“十四五”重大科技项目(KJGG2022-0901)。

摘　　要：尼日尔三角洲盆地深水A目标已钻2口井,揭示储层较薄、横向变化快,且主力油层高部位钻遇油水界面,前期评价无经济效益。针对目标储层展布特征及含油分布规律不明、含水砂岩与含油砂岩均表现为强振幅的"亮点"特征的难题,运用基于叠前同时反演的岩相概率体分析技术,提高了砂岩预测的准确度,明确了主力目的层甜点储层发育规律。通过AVO属性分析类比,明确流体因子属性在烃类检测中具有明显的优势:可以明显地识别油层与水层;通过流体因子的变化规律可以推测油层厚度的变化趋势;横向连续性较好,对油层平面展布规律有较好地体现。综合地震平点分析及油气成藏研究,在近逆冲断层处构造低部位的砂岩概率体高异常区、AVO流体因子高异常区、地震平点界面之上部署一口探井,实钻取得了很好的勘探成效。Two wells were drilled in target A in the deep water Niger Delta basin,which revealed that the reservoir is thin,and the lateral change is fast.In addition,the high position of the main reservoir confirms the oil-water interface,and the preliminary evaluation has no economics.Aiming at the problem of unknown reservoir distribution characteristics and oil-bearing,both water-bearing sandstones and oil-bearing sandstones are"bright spot"characteristics,Facies and Fluid Probabilities based on pre-stack simultaneous inversion is used to improve the accuracy of sandstone prediction.The distribution of sweet spot reservoir is clarified.By AVO attribute analysis analogy,it is clear that the fluid factor attribute has apparent advantages in hydrocarbon detection.First,it can identify oil layer and water layer.Second,the variation trend of reservoir thickness can be inferred from the changes in the fluid factor.Third,the fluid factor's horizontal continuity is good,reflecting the plane distribution of the reservoir.An exploration well was designed based on seismic flat spot analysis and hydrocarbon accumulation study,which achieved good exploration results.

关 键 词：尼日尔三角洲盆地 深水沉积 叠前同时反演 岩相概率体 AVO属性 勘探成效 

分 类 号：P631.4[天文地球—地质矿产勘探]