“非常规油气缝-孔耦合富烃假说”概述

Hypothesis outline of fracture-pore coupling enriching hydrocarbon on unconventional oil and gas

针对非常规油气富集的关键控制因素不清,富集机制与富集效率不明等科学问题,采用广泛调研、野外观察、岩心描述、镜下鉴定、模拟实验、统计分析等手段和途径,结合科研实践,提出了缝-孔耦合是制约非常规油气滞留、运移、聚集、富集关键控制因素,即“缝-孔耦合富烃假说”。主要结论包括:①缝-孔耦合不仅控制了非常规油气运聚、富集与成藏的动力与阻力、还控制了运移的通道和聚集的空间,而且也制约着非常规油气运聚、富集与成藏的相态、方式、流体流动规律和运聚富集的效率。②总结出 16 种缝-孔耦合类型,划分优势耦合、良好耦合、一般耦合和不利耦合等 4 个评价级别的缝-孔耦合,其中优势耦合的缝-孔系统最有利于非常规油气的运聚、富集与成藏,其次是良好耦合。③概述了“缝-孔耦合富烃假说”提出的背景、基本原理、主要依据、主要观点以及基于“缝-孔耦合富烃假说”的勘探思路。“缝-孔耦合富烃假说”的系统梳理对非常油气勘探具有指导意义,但还有待于进一步修正、完善和发展,以丰富和发展非常规油气成藏理论。

There are some problems in unconventional hydrocarbon enrichment research,such as unclear key controlling factors,unclear enrichment mechanism and efficiency. By means of investigation,field observation, core description,microscopic identification,simulation experiment and statistical analysis,combined with its own research outcome,this paper proposed the hypothesis of“fracture-pore coupling enriching hydrocarbon” based on the knowledge of fracture-pore coupling is the key controlling factor restricting unconventional oil and gas retention,migration,accumulation and enrichment. The main conclusions are as follows:(1)Fracture-pore coupling not only controls the dynamic and resistance of unconventional hydrocarbon migration,accumulation and enrichment,but also controls their migration channels and accumulation space,as well as their phase, mode,fluid flow rule and efficiency of migration and accumulation.(2)There are 16 kinds of fracture-pore coupling and four evaluation levels of fracture-pore coupling of advantage coupling,good coupling,general coupling and unfavorable coupling,and fracture-pore system with advantage coupling is most conducive to the migration, accumulation and enrichment of unconventional oil and gas,followed by that with good coupling.(3)This paper summarized the background,basic principle,main basis,main viewpoints of the“fracture-pore coupling enriching hydrocarbon hypothesis”,and exploration strategy based on this hypothesis. This hypothesis has important guiding significance for unconventional oil and gas exploration,but it still needs further revision,improvement and development to develop the unconventional oil and gas accumulation theory.