叠前弹性参数反演在黄珏油田的应用

Application of pre-stack elastic parameter inversion in Huangjue Oilfield

为了预测苏北盆地高邮凹陷黄珏油田岩性油气藏Ed24有利砂体发育区,提出了利用叠前弹性参数反演预测砂体的思路。通过研究区地层弹性参数对砂岩的敏感性分析试验,筛选出2个对砂岩反应较敏感的弹性参数(弹性波阻抗和体积模量)。在精细地震AVO处理的基础上进行AVO属性反演,然后将常规波阻抗反演算法应用于AVO属性数据,最终得到纵波速度、30°弹性波阻抗和体积模量3个弹性参数。针对黄珏油田Ed24地层特征,利用30°弹性波阻抗、体积模量和弹性波阻抗的反射率预测有利砂体发育区。Ed24砂体在平面上整体呈扇形展布,主要可分为2个大的朵叶体,其中位于H83井—H32井西侧的②号砂体发育区最为有利,是下一步岩性油气藏勘探的有利目标。

The prediction of lithology using elastic parameters is presented for the exploration of lithologlc oil reservoirs in the Huangjue area. Two elastic parameters （bulk modulus （K） and E1 （30）） are more sensitive to sandstone and claystone based on the sensitivity analysis of eight elastic parameters. Three elastic parameters （P wave velocity, bulk modulus （K） and E1 （30）） were inverted using pre-stack time migration CRP gather data and well log data through pre-stack elastic parameter inversion. It is obvious that bulk modulus （K） and E1 （30） are better than P-wave velocity for sand discrimination. Two fans （Ed2^4） develop in the study area, one is located at the west of Wells H83 and H32, N-S trending; the other is located at the area between Well H83 and Well Hll, N-E trending. Number 2 sandbody of the six sandbodies is the most favorable exploration target in the area.