隐蔽油气藏成藏机理研究现状及展望

Progress and Prospect of Research on Hydrocarbon Accumulation Mechanism of Subtle Reservoirs

隐蔽油气藏可以按其判别难度、隐蔽方式、油气富集动力学机制等进行分类。按动力学成因可基本分为五类:浮力顺优势通道输导油气聚集成藏、毛细管力引入油气聚集成藏、深盆气体体积膨胀推排油气聚集成藏、分子吸附油气聚集成藏、分子结合力聚集甲烷水合物气藏。受盆地类型、构造背景、沉积环境等因素的影响,不同地区、不同类型的隐蔽油气藏成藏主控因素不同。论述了国内外对隐蔽油气藏的分类、成藏主控因素、成藏动力系统和成藏模式等研究的进展,提出了进一步开展我国隐蔽油气藏成因机理和富集规律等研究的方向。

Subtle reservoirs can be classified by identifying difficulty, concealed style and hydrocarbon accumulation dynamics. In dynamic mechanism, they could be classified as 5 models of hydrocarbon accumulation： a） hydrocarbon migrating along available channels by buoyanc, b）hydrocarbon inducting into sand lens reservoirs by capillarity, c） by expansion and expelling of gas in deep basin, d） by molecule adsorption, and e） as natural gas hydrate by molecule combination. For lithologic and/or statigraphic reservoirs in different areas, factors predominating hydrocarbon accumulation are varied with different types of basins, structural settings and sedimentary environments. Research progressing on classification, dominant factors, dynamics systems and models of hydrocarbon accumulation in subtle reservoirs are discussed. Future research direction for accumulation mechanism and rule of subtle reservoirs is also proposed.