塔里木古生代原型盆地分析的油气勘探意义

塔里木地区古生代依据构造热体制变化,可以划分为离散型和会聚型两大类 5种不同的原型盆地。早震旦世为裂陷槽;晚震旦世至早奥陶世发育边缘坳陷;中、晚奥陶世-泥盆纪,洋盆消减、闭合、碰撞,在此背景下分别孕育了塔中隆起和塔北隆起;石炭纪-二叠纪,整体处于拉张环境。原型盆地不同,其油气勘探意义不同,处于被动大陆边缘的满加尔坳陷具有较大的沉降、沉积速率,发育有良好的生油气母质。以塔中、塔北隆起为代表的古隆起,为海西期油气运聚的主要指向区,具有良好的储盖条件,是油气重要的聚集场所。

THE SIGNIFICANCE OF THE ANALYSIS OF TARIM PALEOZOIC PROTOTYPE BASINS IN OIL AND GAS EXPLORATION

Five types of prototype basins in two categories of discrete and convergent can be divided according to the changes of Paleozoic structure and thermo-system. Tazhong and Tabei uplifts were developed respectively (or against the background ) due to the emergence of fissured-subsidence troughs in the early Sinian,; with the development of marginal sags from the late Sinian to the early Ordovician and with the subduction ,closure and collision of the oceanic basins from the middle-late Ordovician to the Devonian Period. The whole Carboniferous-Permian period was under the environment of extension. Different prototype basins have different significances for oil and gas exploration. Located in the passive continental margin, Manjiaer sag has greater subsidence and sedimentary rate and has well- developed oil and gas -producing source rocks. The ancient uplift represented by Tazhong and Tabei is a main guiding area of Hercynian oil and gas accumulation and has good conditions for oil and gas reserving and capping and is a very important area for oil and gas accumulation.