塔中地区石炭系非构造圈闭及有利勘探目标

根据圈闭成因、形态特征,将塔中地区石炭系的非构造圈闭分为地层圈闭、岩性圈闭和复合圈闭3大类。这些圈闭的形成与不整合面、古地貌和沉积环境密切相关。由于受成因的控制,非构造圈闭具有平面分带和纵向分层的特点。根据塔中地区石炭系非构造圈闭发育特征和空间分布特点,指出东河砂岩超覆圈闭、中央隆起侵蚀沟谷充填岩性圈闭和阿瓦提北部复合圈闭为3个较为有利的勘探目标,其中,前两个是最有利的目标,勘探中应优先考虑。

Carboniferous non-structural traps in Tazhong area and prediction of favorable exploration targets

The Carboniferous non-structural traps in Tazhong area can be divided into stratigraphic traps,lithologic traps and combination traps according to their genesis and shapes.Formations of these traps are closely related with unconformities,paleotopography and depositional settings.Non-structural traps are characterized by their lateral zonation and vertical layering due to the control of their geneses.Based on the developmental features and spatial distribution characteristics of Carboniferous non-structural traps in the study area,it is believed that the overlap traps of Donghe Formation sandstone,lithologic traps of sandstones filling the eroded ravines and valleys in the central uplift and the combination traps in northern Arwati are relatively favorable exploration targets,of which the former two are the most favorable,thus priority should be given to them in exploration.