【摘要】 伊通地堑西北缘地表及地下地质条件极其复杂,地震勘探程度低,资料品质差,严重制约了对该地区构造特征的认识和油气勘探工作。本文运用构造解析方法,通过对最新的野外露头、钻井、地震等资料的综合研究,发现伊通地堑西北缘新近纪以来总体呈逆冲为主、右行走滑为辅的走滑—冲断复合构造特征,形成宽2～4km的断褶带,其演化受控于新近纪以来该地区断裂的反转构造活动。该断褶带具备良好油气成藏条件,可能是伊通地堑新的找油气领域,油气勘探应该以寻找走滑—冲断作用形成的雁列式背斜带、雁列断块和逆冲断层下盘为主。更多还原

【Abstract】 The geological conditions of the surface and subsurface in North-West margin of Yitong Basin are very complicated, its low exploration degree and poor seismic data quality have a severe impacts on the recognition of the subsurface structure characteristics and oil&gas exploration activities in this region. By using new structure analysis method in this paper and based on integrated studies on new outcrops, drilling data, seismic data and other data, it is found that since Neogene the North-West margin of Yitong Basin has mainly shown strike-slip and thrust composite structure characteristics with thrust as main trend and dextral strike-slip as secondary trend, as a result a 2-4 Km wide fault-fold structural belt has been formed and its evolution has been controlled by reversion tectonic activity in the region. The belt has favorite conditions for hydrocarbon accumulation, it may be the new prospect area for oil exploration in this region, it is believed that the en-echelon anticline belt, the en-echelon fault blocks and the downwall of the thrust fault which were formed by strike-slip and thrust function should be the targets for the future exploration in Yitong Basin.更多还原