PROSPECT OF PETROLEUM FRONTIER IN THE MID-SMALL SIZED MESOZOIC BASINS, NORTH CHINA：A VIEW OF PETROLEUM ACUMULATION CONDITION
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摘要: 侏罗-白垩系地史阶段适宜的古气候与古地理为秦祁昆造山带以北区域内发育成油盆地提供了良好的沉积环境.燕山期构造活动在侏罗纪末和白垩纪末表现突出,导致盆地反转并使侏罗-白垩系沉积实体中富含有机质岩石成为烃源岩且在该大套地层中分别生成早、中侏罗世和晚侏罗-早白垩世两套主要成油体系,相对晚期的燕山-喜山造山作用为在这些盆地侏罗-白垩系地层中构成成藏组合奠定了基础.本文从“控油成藏动力学”(Perrodon,1992)角度,对北方中生代中小盆地成藏组合典型范例特征、成油盆地组构、盆地成藏条件进行论述,明确指出在北方西部中生代中小前陆型盆地中寻找来自早、中侏罗世湖沼煤系源岩垂(侧)向排运方式高阻捕集的油气和东部裂谷作用背景下垂向排烃为主体的晚侏罗世-早白垩世湖沼相含煤火山碎屑岩为主体烃源岩油气聚集构造带作为油气勘探新领域.Abstract: The suitable paleoclimatic and paleogeographic condition in the Jurassic-Cretaceous period provided a favourable depositional environment for formation of hydrocarbon-bearing basins in the north of QinglinQilian-Kunlun orogenic belt.The Yanshanian tectonic activity was strong in the end of the Jurassic and the end of the Cretaceous,which resulted in inversion of basins and formation of two petroleum systems of the Early-Middle Jurassic and the Late Jurassic-Early Cretaceous.Accumulation was formed in late Yanshanian and Himalayan movement.It was pointed out that hydrocarbon was sourced from the Lower and Middle Jurassic coal-bearing sequence via vertical or lateral migration in the mid-small Mesozoic foreland basin in northwestern China,and hydrocarbon was sourced from the Upper Jurassic-Lower Cretaceous coal-bearing sequence in faulted basins in northeastern China.The related accumulations formed in those areas are the potential targets for exploration.
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