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为了明确致密砂岩气藏类型差异对天然气分布的控制作用,以徐家围子地区和古龙地区登娄库组储层为例,通过天然气成藏地质要素和地质过程分析与对比,系统研究了两个地区致密砂岩气成藏规律和气藏类型,提出了徐家围子地区与古龙地区登娄库组致密砂岩气藏类型具有本质差异,且气藏类型差异性控制两地区具有不同天然气分布规律的观点.结果表明:徐家围子地区登娄库组储层致密化时期(约87 Ma)晚于烃源岩生排烃高峰期天然气充注(105~90 Ma),以储层后期致密的“后成型”致密常规气藏为主,天然气主要聚集于断陷期气源岩生气范围及其周边的断裂密集带和邻近气源断层的继承性古隆起、古圈闭;古龙地区登娄库组储层致密化过程(约108Ma)则发生在烃源岩生排烃高峰期天然气充注(108~70Ma)之前,登二段气源岩发育区易于形成储层先期致密的“先成型”深盆气藏,天然气分布主要受登二段气源岩与致密砂岩储层的叠合范围控制.
In order to clarify the control effect of the type differences of tight gas reservoirs on gas distribution, taking the Xuerweizi and Denglouku reservoir in Gulong as an example, through the analysis and comparison of geologic elements and geological processes of natural gas accumulation, Regional tight sandstone gas accumulation law and gas reservoir type, and put forward the viewpoint that the types of tight sandstone gas reservoirs in Denglouku Formation in Xujiaweizi area are different from those in Denglouku formation in Gulong area, and that gas reservoir types have different control over the distribution of natural gas in the two areas. The results show that the Denlüku reservoir during the densification stage (about 87 Ma) is later than the natural gas charge (105-90 Ma) during the peak period of hydrocarbon generation and expulsion in the source rocks, “Dense conventional gas reservoirs, natural gas is mainly concentrated in the gas source rock faulting period and its vicinity of the fault-intensive zone and the adjacent gas source fault paleo-uplift paleo-traps; ancient Dragon Dengde reservoir The layer densification process (about 108 Ma) occurs before natural gas filling (108-70 Ma) during the peak period of hydrocarbon generation and expulsion in the source rock, and the gas source rock development zone in the second member of the Deng 2 Member tends to form a ”compact“ ”preformed" deep reservoir Basin gas reservoir, days The natural gas distribution is mainly controlled by the superimposition range of Deng 2 Member gas source rock and tight sandstone reservoir.