构造运动输导油气能力定量化指标及与油气运聚的关系

The Quantitative Parameter of Tectonic Movement Delivery Capacity for Petroleum and the Relationship with Petroleum Migration and Accumulation

构造运动的性质及其强度对油气运移和聚集过程有重要的影响。输导体系经历强构造运动有利于提高输导效率,而盖层经历强构造运动不利于油气保存;二者之间相互矛盾的复杂关系决定了盆地含油气远景。通过系统分析构造运动影响油气运聚的机理,结合构造运动强度、地层输导条件、断裂输导条件、输导动力等多项因素,对构造运动输导油气能力及与油气运聚的关系进行了研究,提出定量描述构造运动输导油气能力的参数。采用该参数对库车前陆盆地和鄂尔多斯盆地油气运聚过程进行了研究,预测的结果与油气发现有很好的一致性。库车前陆盆地具有高输导能力和优质保存条件,最终形成高丰度的油气聚集。鄂尔多斯盆地具有低输导能力,只能形成大面积分布的低丰度油气聚集。该方法是油田勘探阶段研究构造运动强度与油气运聚关系的有益探索,尤其适合于构造活动时期油气输导能力的评价。

The tectonic movement nature and the intensity have the important influence to the petroleum migration and accumulation process.Petroelum delivery system which experienced strong tectonic movement will be advantageous in the enhancement of delivery capacity.And caprocks which experienced strong tectonic movement does not favor the petroleum preservation.The two contradictory complex relations will decided mutually the basin prospect.Through systematically analyzes mechanism that the tectonic movement influence petroleum migration,unifies many factors such as tectonic movement intensity,strata delivery condition,fault delivery condition,delivery force and so on.The relationship between tectonic movement delivery capacity and efficiency of petroleum migration and accumulation was detailed studied.A Quantitative parameter was raised to describe the tectonic movement delivery capacity.This parameter was used to study the petroleum migration and accumulation process.The forecast results are very good with the facts consistency.Kuche foreland basin has high delivery capacity and good caprocks,so it could form a high abundance of natural gas.Erdos basin has low delivery capacity,so it could only form a low abundance of natural gas which distribute in a large area.The approach is a beneficial exploration for study the relationship between tectonic movement intensity and petroleum accumulation.The delivery capacity during active tectonic movement especially is evaluatied.