叠前同步反演技术在西湖凹陷低孔渗储层“甜点”预测中的应用

Application of prestack synchronous inversion technology in“sweet spot”prediction of low porosity and permeability reservoir in Xihu sag

西湖凹陷目的层埋藏深,储层具有低孔渗特征,但局部发育物性相对好且含气的"甜点"储层,为有效刻画"甜点"储层的展布区域、优选勘探目标,开展了"甜点"地球物理预测技术的研究。通过岩石物理分析,找到了能够识别甜点储层的弹性敏感参数;研究采用分频迭代反演解决厚储层预测问题的思路,利用反演结果结合地质及岩石物理认识刻画了西湖凹陷C构造"甜点"储层分布范围,指导评价井位的部署。经钻探验证,预测结果得到了证实。

Xihu sag has the characteristics of deep burial depth, low porosity and permeability, however, its gas bearing ＂sweet spot＂ has good local development property. In order to effectively depict ＂sweet spot＂ reservoir distribution and optimize explora- tion target, ＂sweet spot＂ prediction technology based on geophysics is conducted. Through petrophysics analysis, sensitive elastic parameters used for identifying ＂sweet spot＂ are found, in addition, frequency iterative inversion technology is adopted to resolve thick reservoir prediction, and ＂sweet spot＂ reservoir distribution zone of C construction in Xihu sag is depicted by inversion re- suits combined with the recognition of geology and petrophysics, furthermore, the research evaluates well deployment and the pre- diction is verified by drilling.