多波联合解释提高四川盆地震旦系储层预测的精度

摘要

随着研究和钻探的深入,越来越认识到四川盆地川中PLN地区震旦系灯影组复杂的地质背景和储层的非均质性.震旦系灯影组反射特征多变,且存在低速的硅质云岩,其纵波阻抗与储层接近,利用单一纵波无法区分硅质与储层,储层预测难度较大.通过测井数据统计和模型正演综合分析得出,横波阻抗可以有效地识别储层和硅质云岩.通过对实际多波资料的层位标定和层位匹配,联合对比解释纵波和转换波地震剖面,能够有效地识别储层,提高储层预测的精度.%With the deepening of research and drilling,complex geological background and reservoir heterogeneity are awarend in Dengying Formation in the PLN area of Sichuan Basin.Reflection characteristics is changeable in Dengying Formation of the Sinian System.There are low-velocity siliceous dolomite,which is close to the reservoir in P-wave impedance,so using the P-wave impedance cannot distinguish between siliceous dolomite and reservoir,the reservoir prediction is difficult.In this paper,through the statistics of well logging data and the model forward,it is concluded that the shear wave impedance can be effectively used to identify the reservoir and the siliceous dolomite.Through the layers calibration and layers matching of real multiwave data,the interpretation of P-wave and converted wave seismic section can effectively identify the reservoir,improve the reservoir prediction accuracy.