塔里木盆地西北缘柯坪地区油气前景

Hydrocarbon Prospects of Keping Area on the Northwestern Margin of Tarim Basin

丰富的地面油气显示及奥陶系、志留系普遍含沥青的事实，表明本区曾有过大规模的油气运聚过程。柯坪断隆实际上是上新世库车期形成的逆掩推覆带，其下尚隐伏着与巴楚断隆连为一体的古隆起。地面油气显示并不能证明地下已无油气藏存在。推测上覆推覆带中有聚集油气的可能性，而下伏古隆起形成大油气田的可能性更大。

Abundant oilseepage and asphalt existing in the Silurian and the Ordovician reveal large-scale petroleum migration and accumulation happened in Keping area. Actually, Keping fault-uplift, under which there exists a paleouplift as a part of Bachu fault-uplift, is an overthrust belt formed during Neocene Kuche period. Oil/gas shows on the ground can′t prove there are no oil/gas pools underground. It is predicted that there is probability of hydrocarbon accumulation in the overthrust belt, and the probability to form giant oil/gas fields is much larger in the covered paleouptift.