油气成藏期研究方法和进展

 油气成藏期研究是油气藏乃至含油气系统研究的关键问题之一，也是含油气盆地油气藏形成与分布规律研究首先研究和解决的重要问题。传统的成藏期分析方法是通过盆地的构造发育史、圈闭形成史、烃源岩生排烃史的研究，根据油源岩的主生油期、圈闭形成期、油藏饱和压力分析油气藏形成期，属于间接确定油气成藏期的方法。近年来，石油地质、地球化学等学科的发展以及技术方法的改进，为油气成藏期研究提供了更多的技术手段，主要包括流体历史分析方法、油藏地球化学方法、油储磁性矿物古地磁定年、油田卤水碘同位素定年、成藏门限分析等。本文阐述了成藏期研究的方法及其优缺点，并讨论了成藏期研究的发展方向。

Analysis Methods and Progresses of Dating of Hydrocarbon Accumulation

The dating of hydrocarbon accumulation is a key issue in the research of hydrocarbon reservoirs, or even of petroleum systems and it is very important for the hydrocarbon reservoir formation and distribution in petroliferous basins. Based on the structural history, trap evolution, and hydrocarbon generation and expulsion, the traditional analysis methods including the analysis of hydrocarbon generation dating of source rocks, trap formation dating and reservoir saturation pressure are applied to determine the dating of hydrocarbon accumulation. They all are indirect methods. Recently, with the development of petroleum geology and geochemistry and the progresses of technology, new methods were proposed and applied for the dating of hydrocarbon accumulation, including the analysis of fluid inclusion, reservoir geochemistry and hydrocarbon accumulation threshold. They can qualitatively or quantitatively date hydrocarbon accumulation with results more reliable than those obtained by using the traditional methods. This paper reviews the basic principles of various new and traditional methods for hydrocarbon accumulation dating. The development trend of the studies of hydrocarbon accumulation dating is also briefly discussed.