卡拉沙依组砂泥岩段地震反演储层识别

Reservoir identification by use of seismic inversion in the Kalashayi Formation arenaceous mudstone interval within the 3D area

根据测井曲线对储层与非储层的响应特征,利用测井约束三维地震波阻抗和自然伽马反演相结合的方法,对塔中卡1三维区卡拉沙依组砂泥岩段砂岩厚度及平面展布进行预测。结果表明:储层砂体发育于区内东南部,为来自东南方向多个分流河道组成的三角洲朵体,厚度向北西方明显减薄,符合该段在整个盆地台盆区东南部所代表的沉积环境(冲积扇—河流相区域)。该储层识别方法与预测结果对在塔中地区寻找油气藏具有重要意义。

Based on the response characteristics of logging curves to reservoir and non- reservoir,sandstone thickness and areal spreading in the Kalashayi Formation arenaceous mudstone interval within the Ka- 1 3D area in Tazhong have been predicted by means of integration of logging constrained 3D seismic impedance and natural gamma inversion. It is indicated from the results that the reservoir's sand bodies were developed in the south- eastern part of the area,being a lobate delta remarkably thinning north-westwards,composed of multi- distributory channels coming from southeast,which is consistent with the depositional environment( alluvial fan – fluvial facies area) represented by the interval part located in the southeastern platform- basin transitional area overthe whole basin. The reservoir identification technique and the predicted results are of importance for oil and gas reservoir searching in the Tazhong area.