石油与天然气地质 ›› 2004, Vol. 25 ›› Issue (1): 70-74,80.doi: 10.11743/ogg20040113

• 油气地质 • 上一篇    下一篇

川西坳陷孝泉-新场地区须家河组二—四段构造应力场模拟及裂缝发育区带预测

张守仁1, 万天丰1, 陈建平2   

  1. 1. 中国地质大学地球科学与资源学院,北京 100083;
    2. 辽宁工程技术大学资源环境学院,辽宁阜新 123000
  • 收稿日期:2003-12-02 出版日期:2004-02-25 发布日期:2012-01-16

Tectonic stress field modeling and fracture prediction in T3χ2-4 strata in Xiaoquan-Xinchang area, western Sichuan depression

Zhang Shouren1, Wan Tianfeng1, Chen Jianping2   

  1. 1. China University of Geosciences, Beijing;
    2. College of Resources and Environment, Liaoning Engneering and Tchnology University, Fuxin, Liaoning
  • Received:2003-12-02 Online:2004-02-25 Published:2012-01-16

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摘要：

弹-塑性增量法应力场模拟,就是用若干个直线段去逼近抛物线型应力应变曲线,在每个直线段中按有限元法进行弹性模拟计算。运用该方法对孝泉-新场地区须家河组二—四段构造应力场进行了精细数值模拟。结果显示孝泉-新场地区为一构造裂缝不发育地区,仅断裂带附近区域构造裂缝较发育。经地震剖面解释及构造演化分析,该区主要断裂带是油气运移的良好通道,且不存在油气的严重漏失。因此,断裂带附近区域是天然气勘探最有利区域,特别是近东西向断裂与现今主应力方向平行,表现为开启性,对天然气的导通作用更为明显。

关键词: 构造应力场, 弹塑性增量法, 构造裂缝, 油气勘探

Abstract:

Elastic-plastic incremental modeling of tectonic stress field is to approximate parabolic stress-strain curves with several linear portions and perform elastic modeling with finite element method in each linear portion. It is applied to perform numerical simulation of the tectonic stress field in T3x2-4 strata in Xiaoquan-Xinchang area.Modeling results show that structural fractures are poorly developed in this area,except in the near-fault regions where regional structural fractures are relatively well developed. Seismic section interpretation and structural evolution analysis reveal that the main fractured zones are good hydrocarbon migration pathways and no serious leakage of hydrocarbons exists.Therefore,favorable regions for gas exploration are those neighboring faults,especially the near E-W trending faults which are parallel with the current major stress and in open state can more effectively conduct gas.

Key words: tectonic stress field, elastic-plastic incremental method, structural fracture, petroleum exploration

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