渤海湾盆地八面河缓坡带断裂系统及其对孔店组油气成藏的影响

FAULT SYSTEM OF GENTLE SLOPE BELT AND ITS AFFECT ON THE FORM OF OIL-GAS RESERVOIRS OF KONGDANG SET IN BAMIANHE RAMP OF DONGYING DEPRESSION,EASTERN CHINA

断裂系统对于断陷盆地洼陷带油气成藏的作用勿庸置疑,而对于缓坡带基底断裂系统的研究则有助于了解箕状断陷湖盆深层油气成藏及其分布的一些规律。分析了八面河斜坡断裂系统分布特征和构造样式,探讨了其对烃源岩、储层、输导系统和圈闭等成藏要素的影响。指出八面河缓坡带孔店组断裂系统在平面上总体呈北东向和东西向两组展布,既有盆倾断裂,也有反向断裂;在剖面上呈现出“鹿角状”、“Y状”、“多米诺状”等构造样式;二者的组合在缓坡带形成了一系列断裂坡折带、鼻状构造带,并将斜坡切割成多个断块,为烃源岩的生成、储层的形成和展布、物性的改善、输导体系和多种圈闭的形成创造了很好的条件,并极大地影响了孔店组油气藏的形成。

Studying on fault system of base is favor of finding out the rules of forming and distributing of oil-gas. On the base of analyzing of the distributing feature and structure type of fault system in Bamianhe ramp, its affect on the elements of reservoir formation, such as hydrocarbon source rock, reservoir, conducting system, traps and so on, was discussed. The fault system, which composed of ones tilting toward basin and reserving toward basin, distributed as a whole along North-East and East-West in the plane, and appeared many structure styles such as antler-like, Y-like and dominoes-like and so on in the profile. The fault groups formed a series of fault slope-break belts and nose-like structure belts, and cut the ramp into many fault-blocks. All of these were propitious to the formation of hydrocarbon source rock, the improving of reservoir physical properties, the forming of conducting system and traps,and so affected greatly on the form of oil-gas reservoirs of Kongdang set.