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塔中地区CⅢ 油组是塔里木盆地塔中隆起主力产层 ,由石炭系巴楚组底砂岩及泥岩构成储盖配置。海西早期运动所形成的区域性不整合 (Tg3) ,一方面使早期形成的古油气藏遭受破坏 ;另一方面使主力烃源层即中 上奥陶统停止生烃。海西末及其以后 ,中 上奥陶统二次生排烃、圈闭形成 ,是CⅢ 油组主要成藏期。多次构造变形造成石炭系褶皱 ,形成了一系列近EW向的三级构造带 ,发育大量的圈闭构造群。三级构造带的空间组合形成油气运移的汇烃脊。圈闭是否能够形成油气藏 ,取决于其是否处于汇烃脊之上。
The CⅢ oil group in Tazhong area is the main strata of TaZhong uplift in the Tarim Basin, and is composed of bottom sandstone and mudstone of Carboniferous Bachu formation. The regional unconformity formed by the Hercynian early movement (Tg3), on the one hand, destroyed the earlier formed paleo-oil and gas reservoirs; on the other hand, the main hydrocarbon source, ie, the Upper Ordovician, ceased hydrocarbon generation. After the end of Hercynian and later, the Middle Paleo-Upper Ordovician secondary hydrocarbon expulsion and trapping formed the main accumulation period of CⅢ oil group. Many tectonic deformation caused Carboniferous folds, forming a series of tertiary EW directional tectonic belts and developing a large number of trapping tectonic groups. The combination of the three tectonic belts forms a hydrocarbon sink ridge that is transported by the hydrocarbons. Whether a trap can form a reservoir depends on whether it is above a hydrocarbon ridge or not.