断层垂向封油气性综合定量评价方法探讨及应用

在断层垂向上封油气机理及影响因素分析的基础上,通过物理模拟建立了原油通过断裂带运移速度与断层填充物粒度、倾角和泥质含量之间的函数关系。根据断裂带粒度、泥质含量和倾角,基于求取油气通过断裂带运移速度的大小,建立了利用油气通过断裂带运移速度研究断层垂向封油气性的综合定量评价方法。将该方法分别应用于库车坳陷克拉2气田和车古20潜山主要断层垂向封气和油性评价中,评价结果与实际地质条件吻合较好,表明该方法用于评价断层对油气的垂向封闭性均是可行的,是一种综合定量的评价方法。

A COMPREHENSIVE QUANTITATIVE EVALUATION METHOD ON FAULT'S VERTICAL SEAL FOR OIL AND GAS AND ITS APPLICATION

Based on the analyses of vertical seal mechanism of fault for oil and gas and its influence factors, this paper established the relations among oil migration velocity and grain of filling materials, tip angle and mudstone content of fault zone by physical simulation experiment. According to the grain of filling materials, tip angle and mudstone content of fault zone, by calculating the oil and gas migration velocity through fault, this paper established a comprehensive quantitative evaluation method on fault's vertical seal for oil or gas by the migration velocity of oil and gas through fault zone. This method was applied in evaluating the vertical seal of main faults for oil or gas migration and seal in the Kela 2 gas field of the Kuqa Depression and in the Chegu 20 Buried Hill of the Shengli oil field respectively, and the evaluation results were coincident with the actual geological conditions, which indicated that the method was practical to evaluate the fault's vertical seal for oil and gas. So it could be a comprehensive quantitative evaluation method.