非稳态成藏理论探索与实践

Exploration and Practice for Theory of Unsteady-state Hydrocarbon Accumulation

将油气从生成到散失全过程作为时间域内一个连续而统一的系统,并将其分为前油藏、油藏及后油藏等三个阶段,定义了非稳态油气藏的概念,建立了非稳态油气成藏理论框架。非稳态油气藏是指油气处于充注或调整过程之中、尚未形成统一的油气水界面、油气水处于动态平衡状态下的油气富集单元,主要特征表现为在相互连通的储集体内出现多个或大幅度倾斜的油气水界面,或者出现油气水关系侧向倒置等特殊现象。对塔里木盆地哈得逊油田东河砂岩油藏进行了物理模拟实验,探讨了后油藏阶段油气的富集类型,拓宽了油气勘探开发对象。将非稳态油气成藏理论应用于哈得逊地区和塔中4油田的滚动勘探开发实践,后油藏的概念得到了勘探的证实,取得了良好的勘探效果。非稳态油气成藏理论为塔里木盆地油藏滚动勘探开发奠定了新的理论基础。

The authors regard the entire process within a continuous period from oil and gas being formed to them being lost as a unined system, which can be divided into pre-reservoir, reservoir and post-reservoir stages. The concept of unsteady-state of ressrvoris is dafined and the theomtical frarnework of unsteady-state hydrocartion aocurnulation is estatished.An unsteady-states oil reservoir is defined as the oil and gas enrichment unit with a dynamically balanced gas-oil-water state instead of a unified oil-water contact, which is formed h the procass of hydrocation fulfiling or adjustment. It is mainly characterized by multiple or significarity thed gas-oil-water contacts within interconnected reservoirs or laterally inversed gas-oil-water reations. More targets for oil and gas exptxation and development are emerged by physical modeling for Donghe Sandstone reservoir in Hadexun Oilfield , Tarim Basin, and research to the types of hydrocarbon enrichment duirng the post-raservoir stage. The theory of unsteady-state hydocarbon accumulation that was applied to the rolling exploration and development in Hadexun Oilfield and Tazhong-4 Oilfield has preliminarily cordirmed the concept of post-reservoir and improved exploration effect.