Structural unit division and petroleum exploration direction in the Yin'E Basin
The Yin'E Basin is one of the onshore basins less explored in China.Progress has been made in recent years in the petroleum exploration of this basin,but the complex geological structure restricts partly the on the understanding of structural units within the basin,leading to an unclear petroleum exploration direction.Based on the data of drilling,seismic and gravity exploration,the distribution of major faults in the basin is ascertained,the Mesozoic structural units are divided,the Mesozoic sag distribution is clarified,and the petroleum exploration direction in the basin is proposed.The results are obtained in four aspects.First,in the Yin'E Basin,obvious unconformity characteristics are found between Mesozoic and pre-Mesozoic.The upper and lower structural layers are significantly different in lithology combination and structural style.The lower structural layer includes a series of complex folds and thrust structures,and the upper structural layer is composed of nearly E-W and N-E fault-depression groups.Second,the basin is mainly separated by the Hongshishan fault zone,the Altun fault zone(or its branches),the Engeerwusu fault zone and the Chaganchulu fault zone,forming multiple uplifts and depressions.The depressions are composed of multiple sags and bulges.Third,hydrocarbons were mainly accumulated in the lower part of the gentle slope of the Mesozoic dustpan-like fault depression,and later uplifted and reworked.The present-day relatively shallow sags are worthy of attention,with a favorable exploration area of more than 5×104 km2.Fourth,the thick mudstones containing micro-pores dominated by intergranular nano-pores can be evaluated systematically according to the exploration approach for unconventional reservoirs,to understand its exploration potential.It is concluded that the research results are of great significance in deep understanding of the basic structures of the basin,further supporting the analysis of petroleum exploration direction in the basin,and promoting the petroleum exploration process in the basin.
Yin'E BasinMesozoicPre-MesozoicStructural unitSag distributionPetroleum exploration direction
万方数据
维普
