Carboniferous structural characteristics and hydrocarbon accumulation regularity of Chepaizi Uplift in Junggar Basin
The Chepaizi Uplift of Junggar Basin has favorable reservoir conditions for dual source hydrocarbon supply,with low exploration level and great potential.Based on the newly collected 3D and reprocessed 2D seismic data,the structural characteristics of the area were clarified through fine structural interpretation.The research results indicate that:(1)Controlled by four northwest thrust faults in the Late Carboniferous-Early Permian and multiple north-south faults in the Early Carboniferous,the Chepaizi Uplift Carboniferous system is divided into three zones from south to north:southern,central,three stripes in northern,and three steps in the east-west direction.The eastern second step and the western Aika fault are shallowly buried on the hanging plate,adjacent to the main source rock stove,and are the most favorable locations for reservoir formation.(2)A series of fault blocks formed by the cutting of north-south faults in the northwest southeast direction control the distribution of oil and gas in the Carboniferous system,and have the characteristics of fault block controlled reservoirs.(3)When the degree of fracture development is comparable,reservoir is a key factor in controlling oil and gas production,among which volcanic eruption facies reservoirs have good matrix properties,which are most conducive to oil and gas enrichment.(4)The four major faults,namely the Shamenzi Fault,Chepaizi Fault,Chepaizi South Fault,and Aika Fault,have developed explosive facies on the hanging wall,with shallow burial depth.Also connected to the two major source rocks of the Fengcheng Formation in the Shawan Depression and the Jurassic in the Sikeshu Depression over a large span,and have superior reservoir conditions,making them favorable areas for further exploration.
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