论文部分内容阅读
额济纳旗地区侏罗纪以来经历了两期断陷盆地的发育。早—中侏罗世研究区处于一种张扭构造环境之中，晚侏罗世盆地发生明显抬升和反转。日垩纪—早第三纪盆地演化为一个完整的裂谷发育过程，下白垩统是裂谷早期断陷作用的产物，而上白垩统和下第三系则代表裂谷后期热沉降（或区域坳陷）沉积。侏罗纪盆地和白垩纪盆地应属两类不同性质盆地。两期盆地的不同叠置关系控制了本区烃源岩的发育，影响到这一地区坳陷的油气潜力。下白垩统烃原岩为较差—较好烃源岩，中—下侏罗统为好烃源岩。各凹陷的生烃潜力取决于两期生烃洼陷的规模和叠置关系，天草凹陷继承性发育，中—下侏罗统和下白垩统两套烃源岩叠置关系较好，是额济纳旗地区最有远景的凹陷。
The Ejinaqi area experienced two stages of faulted basin development since the Jurassic. The Early-Middle Jurassic study area was in a tension-twisting tectonic setting, and the Late Jurassic basin was obviously uplifted and reversed. The Cretaceous-Early Tertiary basin evolved into a complete rifting development. The Lower Cretaceous is the product of the early rift faulting. The Upper Cretaceous and the Lower Tertiary represent the late stage of the rift thermal deposition (or Regional depression) deposition. The Jurassic and Cretaceous basins belong to two different types of basins. The different overlying relationship between the two basins controlled the development of source rocks in this area and affected the hydrocarbon potential of the depression in this area. Lower Cretaceous hydrocarbon source rocks are poor - better source rocks, and Middle - Lower Jurassic are good source rocks. The hydrocarbon generation potential of each depression depends on the size and overlying relationship of the two hydrocarbon generation depressions. The succession development of the Amakusa sag and the superimposition of the two sets of source rocks in the Middle-Lower Jurassic and Lower Cretaceous are good. The most promising depressions in the area.