松辽盆地南部深层天然气藏地化特征

GEOCHEMICAL CHARACTERISTICS OF DEEP GAS RESERVOIRS IN SOUTH SONGLIAO BASIN

文章对松辽盆地南部深层烃源岩的有机质丰度、有机质类型、成熟度等进行分析研究,总结了该地区深层天然气的分布、成因等地球化学特征。研究结果表明,该处天然气主要是有机成因,有机质类型主要为II型干酪根,有机质演化程度已达到成熟或过成熟阶段。除布海为典型的煤成气外,其它绝大部分地区基本上为煤型气与油型气的混合。这些研究成果在双坨子地区的勘探中取得了明显的效果,也将为该盆地油气勘探由松辽盆地北部向其南部转变提供可靠的地质依据。

Based on analysis of the abundance, type and maturity of the organic matters in the deep source rocks in the southern Songliao basin, the geochemical characteristics in this area, such as the distribution and genesis of natural gas, are summarized. The natural gas in this area is mainly of organic origin, with kerogen of type Ⅱ as the main organic matters, which are in the mature to post-mature evolutionary stages. Gas reservoirs in most part of this area are basically mixture of coal-related gas and oil-related gas, except in Buhai where gas reservoirs are of typical coal-related gas. Application of these research achievements in exploration in Shuangtuozi area is fruitful and it provides a reliable geological basis for shifting the focus of exploration from the northern part to the southern part of Songliao basin.