油气成藏动态预测

油气成藏动态预测法,将油气成藏过程涉及的地质因素和作用分别称为可见系统和不可见系统。前者为烃源岩、输导层、区域盖层和圈闭组成的成藏要素格架;后者为在前者之中运行的烃源岩生烃作用、初次及二次运移作用和油气向圈闭充注的成藏作用。油气成藏动态预测法以成烃期烃源岩或近烃源岩输导层的构造图为基础,结合相应图件按油气生成、运移和聚集成藏的过程,分析和预测可能形成油气聚集的构造或非构造圈闭分布的地区。同时,根据成藏期后沉积盆地沉降和构造作用是否引起原生油气藏的变化,绘出油气成藏预测图或油气成藏过程分析图。如果后期变化显著,则须绘制烃源岩或近烃源岩输导层的今构造图,同分析图比较,以分析原生油气藏保存的现状和预测次生油气藏形成的位置。

DYNAMIC PREDICTION OF OIL AND GAS POOL FORMATION

In accordance with the method of dynamic prediction of oil and gas pool formation, the geological factors related to the process of pool formation and effects can be respectively referred to as two systems of visible system and invisible system. The visible system Framework of system of pool forming elements is composed of source rocks, carrier beds, regional seals and traps. Invisible system hydrocarbon generation, pool formation and its processes, run in and along the framework of the former system, includes the hydrocarbon generation, primary and secondary migration and charge to trap forming the pools. The method of dynamic prediction of oil and gas pool formation is based on the structural map of source rock or the carrier bed near the source rock occurring during the stage of hydrocarbon generation. And then, upon which it is superposed respectively by the maps of pool forming elements and other corresponding maps, using that separately to analyze and predict the possible structural or non structural traps which may be charged by the oil and gas. And at the same time, a predictive map of oil and gas pool formation or a analytic map of the process of pool formation will be drawn up according to whether the changes of primary oil and gas pool formation caused by the successive subsidence and tectonic activity of sedimentary basins in post-pool-forming stage. If great changes really occurred in the primary pools, it is, thereby, necessary to draw up a map of the present structural map of source rock or carrier beds near the source rock to compare with the analytic map to analyze the present occurrences of the primary pools and predict the location of secondary oil and gas formation.