测井约束反演在泌阳凹陷下切谷储层预测中的应用

RESERVOIR PREDICTION OF INCISED VALLEY IN BIYANG DEPRESSION WITH LOGGING CONSTRAINED SEISMIC CONVERSION METHOD

以泌阳凹陷为例 ,在层序地层学研究的基础上 ,应用测井约束反演方法进行了下切谷精细解释和储层预测。首先 ,利用测井约束反演方法进一步确定该区下切谷的存在 ,并在多井约束条件下从反演三维数据体中精细解释了下切谷的分布范围、发育规模和内部充填序列 ,对该区下切谷的形成和充填过程进行了解释。在此基础上 ,提出了泌阳凹陷下切谷充填过程为“顺源堆积”的新结论。同时针对下切谷内隐蔽圈闭的形成条件 ,选取透镜砂体、上倾尖灭砂体和上倾方向被断层遮挡的砂体为该区有利砂体 ,进而对 14个有利砂体的展布、组合规律及隐蔽圈闭的类型、规模及位置进行了预测 ,为该区隐蔽圈闭预测和井位部署提供了重要的技术依据。

The logging constrained seismic conversion method was applied to fine interpretation and reservoir prediction of an incised valley in the Biyang Depression, on the basis of sequence stratigraghy. The existence of incised valley in Biyang Depression was verified by the result of logging constrained seismic conversion. The distribution, dimension and inside filling manner of the incised valley were finely interpreted by means of the seismic conversion data constrained with many logging data. On the basis of these interpreted results, the forming and filling processes of the incised valley were analyzed, and a new filling mechanism of the incised valley in the Biyang Depression was put forward. Three kinds of sandstone, i.e. ventricular sandstone, upward wedge-out sandstone, sandstone shut off and sheltered by a fault, were chosen to be the sandstone favorable for forming subtle traps. The distribution and assemblage with mudstone of 14 favorable sandstones, as well as the types, size and geographical position of the subtle traps were predicted. The results may provide an important technological aid for predicting the subtle traps and well placement.