惠民凹陷构造应力场与油气运聚模拟分析

Simulation analysis of the tectonic stress field and the oil - gas migration - accumulation in Huimin Sag

采用有限元法对惠民凹陷东营组沉积末期、馆陶组沉积末期和现今构造应力场进行了二维数值模拟,研究了地应力场的分布特征及其对油气运移的控制作用,并预测了油气运聚的优势区域。研究结果表明,在东营组沉积时期,双丰构造、临盘构造、商河构造及营子街构造带是油气运移的主要指向区;在馆陶组沉积末期,商河、玉皇庙、江家店及瓦屋等地区是油气运移的有利指向区;现今构造应力场分析表明,惠民凹陷曲堤地垒应力值最低,说明最有利于油气的聚集。研究结果与构造地质及石油地质分析结论相一致。

The two - dimensional numerical simulation was carried out for the end of depositional stage of the Dongying Formation, deposi-tional stage of the Guantao Formation - Minghuazhen Formation, and the present tectonic stress field in Huimin Sag using the finite element method. The distribution characteristics of the earth stress field and their control function to the oil - gas migration were studied,and the advantage areas of oil - gas migration and accumulation were predicted. The study showed that Shuangfeng structure, Linpan structure, Shanghe structure and Yingzijie structural zone were the main pointing areas of oil - gas migration during the Dongying Formation depositional stage; the areas of Shanghe,Yuhuangmiao, Jiangjiadian and Wawu during Guantao Formation - Minghuazhen Formation depositional stage were favorable ones; the stress value was the lowest in Quti horst, Huimin Sag at the present tectonic stress field which means that it was the most favorable area for oil and gas accumulation. The result of the study was consistent with the conclusions of the a-nalysis of the structural geology and petroleum geology.