【摘要】 深水浊积砂岩油气藏是当今世界油气勘探开发的热点目标,西非安哥拉深水区油气资源丰富、潜力巨大.该区第三系深水浊积砂岩埋深浅、成岩作用弱,致使地震反射纵波速度及其阻抗对有利砂岩储层和围岩的区分效果不明显;基础数据的制约如部分井声波或密度资料缺乏或存在质量问题等,给利用井震信息开展地震反演预测带来严重影响.本文旨在研究一套适合该地区储层预测的弱固结浊积砂岩岩石物理技术.为此,通过实际资料的反复论证,提出了拟合推理法确定矿物骨架弹性参数,并对等球颗粒模型进行了改进,创建了适合该地区弱固结浊积岩岩石物理模板,实现了测井曲线的合理校正和横波预测.以此为基础,进一步开展了叠前地震反演和储层的分布预测.结果表明,浊积砂储层预测精度达85%.因此,该岩石物理技术在西非深水区弱固结浊积砂岩的应用是可行的.更多还原

【Abstract】 Deepwater turbidite sandstone reservoir is a "hot" target in today’s exploration and development.In West Africa,Angola deepwater regions have rich hydrocarbon resources and huge potential.The tertiary deepwater turbidite sandstone is buried shallowly and has weak diagenesis.It is not obvious to use the seismic reflection p-wave velocity and impedance to distinguish between the favorable sandstone reservoir and their surrounding rocks.Limited by the lack of measured logs or the unreliability of the measured acoustic,shear or density in some wells,seismic inversion results can be seriously affected.The purpose of this paper is to study a set of rock physics models suitable for reservoir prediction in the region of weakly consolidated turbidite sandstone.The fitting reasoning method which consists of determining the mineral skeleton elastic parameters is introduced,the equivalent grain model is critically improved,and then rock physics templates of weakly consolidated turbidite sandstone is built for the region.Thus the logging curves can be corrected reasonably and shear wave can be predicted.Through seismic prestack inversion,the reservoir prediction accuracy of turbidite sand can be as high as85%.Therefore the proposed rock physics technology is reliable in deep weakly consolidated turbidite sandstone in West Africa.更多还原