塔里木盆地库车油气系统富气的主控因素分析

Key factor analysis of enriching in natural gas in Kuche petroleum system, Tarim Basin

从烃源条件和保存条件两方面分析了库车油气系统的成藏条件 ,结果表明 ,中生界烃源岩分布广泛、厚度大 ,富含倾气的Ⅲ型干酪根 ,成熟度高 ,且主力生气期晚 ,使库车油气系统具备了整体富气的气源条件 ;侏罗系、下第三系、上第三系泥岩及膏盐分布广泛、厚度大 ,微观封闭能力强 ,膏盐的发育有效地降低了喜山期断裂活动对成藏条件的破坏 ,区内具备了良好的保存条件 ;源盖条件的有效匹配使库车油气系统成为继续寻找大中型

The analysis from both HC source and preservation conditions for Kuche petroleum system indicates that the region possesses sufficient gas supply for enriching in natural gas throughout the whole system due to its wide occurrence, huge thickness, high maturation level and rich in gas\|prone type Ⅲ kerogen of Mesozoic source rocks, as well as late generation of most of the natural gas. And also it has the excellent preservation conditions due to the wide distribution, huge thickness and favorable microcosmic sealing ability of Jurassic, Eogene, Neocene mudstone and gypsolith, along with reducing the breakage of fault for gas reservoir due to the occurrence of gypsolith. It is very likely to find more big or huge gas fields in Kuche petroleum system because of the efficient matching between source and preservation conditions.