断层对流体势空间分布的影响及研究方法

Influence of Fractures to Spatial Distribut ion of Fluid Potential and Its Research Methods

付　广,薛永超,吕延防

Fu Guang , Xue Yongchao, Lu Yanfang

大庆石油学院

Daqing Petroleum Institute, Heilongjiang 151400, P. R. China

在研究流体势及其对油气运聚控制的基础上, 通过分析断层在油气运聚中的作用, 从理论上阐述了断层与流体势之间的关系。依据断层封闭与开启时断裂带特征阐述了断层存在对流体势的影响, 得到断层对流体势的影响是有条件的, 只有侧向封闭和垂向开启断层的存在才会改变流体势, 使其空间分布形态发生改变。前者作为相对高势带, 由此向其附近四周势能值降低, 阻止油气的侧向运移。后者作为相对低势带, 由此向其附近四周势能值增大, 其附近四周油气向其汇聚运移。所建立的断层对流体势空间分布影响的研究方法对松辽盆地北部登娄库组气势空间分布特征的研究, 不仅证实了上述结论, 而且表明该方法是可行的。

Based on studying the concept fluid potential and its controlling to oil or gas migration and accumulation, this paper, by analysing the role of faults in oil or gas migration and accumulation, expound the relation between fractures and fluid potential in theory. According to the characteristics of fault zones when they seal or open, the influence of faults to fluid potential is expounded. Considering not all faults to influence the fluid poten tial, only the faults that seal in lateral direction or open in vertical direction can change fluid potential values, make space distribution shape of fluid potential change. The potential value of the former decreases from fault to its all around, and stop soil or gas lateral migration. The potential value of the latter increases from its all around to fault, and oil or gas migrate into faults. This paper studies the space distribution characteristics of gas potential of Dengloukou formation in the north part of Songliao Basin. Using the research method estabished by this paper, the result not only proves above-mentioned results, but also tests and verifies the feasibility of the method.