凝析气藏流体相态特征及影响因素

Phase Behavior Characteristics and Influencing Factors of Condensate Gas Reservoirs

随着深层油气勘探的不断深入,国内外深部地层中发现了相当数量的凝析气藏,而凝析气藏研究的难点在于:烃类流体相态呈复杂多样的特征,这对凝析气藏的勘探、开发和资源预测等都带来了困难,故查明油气相态的成因机制和分布规律,预测油气相态,已成为油气地质理论研究亟待解决的问题。国外研究认为烃类的化学组分、温度和压力系统是影响油气相态多样性的关键因素。近年来,国内学者针对塔里木盆地和渤海湾盆地凝析气藏,初步探索了油气相态的多样性和成因的复杂性,提出了多套烃源岩的发育、多期油气的充注以及成藏后圈闭的多次调整、改造甚至破坏是导致油气相态复杂多样的观点,为流体相态研究奠定了理论基础。

With the deepening of deep oil and gas exploration,a considerable number of condensate gas reservoirs have been discovered in deep strata at home and abroad,and the difficulty in the study of condensate gas reservoirs is that the phase state of hydrocarbon fluids is complex and diverse.This has brought difficulties to the exploration,development and resource prediction of condensate gas reservoirs.Therefore,the identification of the formation mechanism and distribution law of oil gas phase and the prediction of oil gas phase have become an urgent problem to be solved in oil and gas geology theory.Foreign studies have suggested that the chemical composition,temperature and pressure system of hydrocarbons are the key factors affecting the gas phase diversity of oils.In recent years,domestic scholars have explored the diversity and genetic complexity of oil gas phase in the Tarim Basin and the Bohai Bay Basin condensate gas reservoirs,and proposed the development of multiple sets of source rocks,multi-phase oil and gas filling and formation.The multiple adjustments,transformations and even destruction of traps in the post-Tibet traps are the result of the complexity and diversity of the gas phase,which lays a theoretical foundation for the study of fluid phase.