断陷湖盆层序地层单元与油气的关系

陆相湖盆层序地层单元与油气存在密切关系，目前对两关系的研究还远远不够，因此深入研究层序地层界面及所夹持的地层，对分析油气形成、聚集过程具特殊的意义．针对层序地层单元与油气的关系，通过实例分析，总结了体系域中4种成藏模式和主要层序地层界面(初次湖泛面，最大湖泛面)对油气成藏的影响和控制．同时进行了高精度层序地层学研究，以准层序单元为单位，结合实例对准层序与油气的关系进行了探讨，并进行了单井及连井剖面分析，把层序地层单元研究与沉积相有机地结合起来，取得了很好的效果．

The relationship of sequence stratigraphical units and oil-gas in fault-depressed lacustrine basin

The classification of continental lacustrine basin sequence stratigraphical units has an integrated system. There are different sequence boundaries between different sequence stratigraphical units. There is a close relationship between lacustrine basin sequence stratigraphical units and oil-gas, but the study about it is less. Therefore, it is very important to study sequence boundaries and the strata between them for analyzing the hydrocarbon development and accumulation. In order to study the relationship of sequence stratigraphical units and hydrocarbon, with the analyses of lots of examples, in this paper I summarized four accumulation patterns in system tracts, discussed the influence and control of the main boundaries for hydrocarbon accumulation, such as first flooding surface, maximum flooding surface. At the same time, I do the high resolution sequence stratigraphy research. Using actual example, I discuss the relationship between parasequences and oil-gas, analyze the single well and connecting-well section, connect the two analyses of sequence stratigraphy sets and sedimentary facies, and get good results.