【摘要】 构造应力场在油气运聚成藏中具有重要的作用。塔里木盆地北部库车坳陷克拉苏地区受构造应力作用强烈,且天然气十分富集,构造应力场对该区异常高压和油气藏的形成与分布具有重要影响。运用通用有限元模拟软件ANSYS系统,对克拉苏地区晚第三纪库车期构造应力场进行了初步模拟。分析结果表明,油气的分布与最大主应力的分布具有较好的相关性,由高应力值区围限的相对低应力值区或应力值从高向低变化的梯度带是油气聚集的有利部位。更多还原

【Abstract】 The tectonic stress field is of great importance to the oil and gas migration and accumulation.The Kelasu region of Kuche Depression in North Talimu Basin had exerted a strong tectonic stress effect and this region is very rich in natural gas resources. The tectonic stress field had a great influence on the formation and distribution of the abnormal pressures and oil & gas reservoirs. The tectonic stress field in Kelasu region during the Kuche Age of Late Tertiary was primarily simulated by use of the ANSYS system. Through analyzing the results, it was indicated that there exists an evident correlativity between the distribution of the oil and gas and that of the maximum principal stress; and the relatively low stress value areas surrounded by high stress value areas or the gradient transition zones from high stress values to low stress values are the favourable places for oil and gas accumulation. (Financed by the 973 Program project, No.2001CB209103)更多还原