鄂尔多斯盆地靖边地区上古生界致密气成藏机理与富集规律

发布时间：2018-01-20 05:44

本文关键词： 鄂尔多斯盆地靖边地区上古生界成藏机理分布规律主控因素　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：利用鄂尔多斯盆地中南部靖边地区上古生界现有钻井、录井、测井、试气、岩心观察、薄片鉴定和流体包裹体等资料,结合油气成藏地质学、储层地质学、油气地球化学、成藏动力学与含油气系统理论等最新理论方法及手段,系统分析了靖边地区上古生界气藏地质特征、天然气运移聚集特征、成藏模式和成藏主控因素等。靖边地区上古生界地层平缓、构造简单,以障壁海岸沉积体系和三角洲沉积体系为主,整体属于特低孔、低-特低渗储集层,天然气主要来源于C-P煤系烃源岩,气藏甲烷含量高,主要为干气。现今气藏以超低压和低压为主,主要由地层抬升剥蚀、地层温度降低和天然气散失引起。晚侏罗世—早白垩世,尤其是早白垩世期间,烃源岩进入生排烃高峰期,生烃增压作用为天然气初次运移提供了主要动力,致密砂岩气没有优势运移通道,主要为弥漫式运移充注。主力成藏期晚于储层致密化过程,主要为“先致密后成藏”形成的气藏,具有“自生自储源内成藏”和“下生上储近源成藏”2种成藏模式,气藏为典型的“准连续型致密砂岩气藏”。靖边地区上古生界气藏具有准连续、广覆式分布的特征,主要分布于单因素相对较优的位置,而不是最优地区,其富集成藏受生、储、盖及构造等多元耦合关系控制,受单因素控制作用不明显。依据靖边地区上古生界气藏成藏机理、分布规律与主控因素等,可对致密砂岩型气藏的研究提供借鉴作用,同时对鄂尔多斯盆地中南部上古生界天然气勘探开发工作进行指导。
[Abstract]:Based on the existing data of the Upper Paleozoic in Jingbian area, central and southern Ordos Basin, such as drilling, logging, gas testing, core observation, thin slice identification and fluid inclusion, combined with oil and gas reservoir forming geology and reservoir geology. The geological characteristics of Upper Paleozoic gas reservoirs and the characteristics of migration and accumulation of natural gas in Jingbian area are systematically analyzed by the latest theoretical methods and means such as oil and gas geochemistry, reservoir forming dynamics and oil / gas system theory. The upper Paleozoic strata in Jingbian area are flat and simple, mainly composed of barrier coastal sedimentary system and delta sedimentary system, and the whole reservoir belongs to very low porosity and low to very low permeability reservoirs. Natural gas is mainly derived from C-P coal source rock, the methane content of gas reservoir is high, mainly dry gas. Nowadays, the gas reservoir is dominated by ultra-low pressure and low pressure, mainly by strata uplift and denudation. During the late Jurassic-early Cretaceous, especially during the early Cretaceous, the source rocks entered the peak of hydrocarbon generation and expulsion, and the hydrocarbon generation and pressure increase provided the main power for the initial migration of natural gas. There is no dominant migration channel for tight sandstone gas, which is mainly diffuse migration and filling. The main reservoir formation period is later than the process of reservoir densification, which is mainly formed by "first compaction and then reservoir formation". There are two types of reservoir formation models: "self-generation and self-accumulation" and "lower generation, upper reservoir and near-source accumulation". The gas reservoir is a typical "quasi-continuous tight sandstone gas reservoir", and the upper Paleozoic gas reservoir in Jingbian area is quasi-continuous. The characteristics of wide overlying distribution are mainly distributed in the relatively optimal location of single factor rather than in the optimal area, and the rich and integrated reservoirs are controlled by multiple coupling relationships such as generation, reservoir, cap and structure. The effect of single factor control is not obvious. According to the accumulation mechanism, distribution law and main control factors of Upper Paleozoic gas reservoir in Jingbian area, it can be used as a reference for the study of tight sandstone gas reservoir. At the same time, the exploration and development of the Upper Paleozoic natural gas in the central and southern Ordos Basin are guided.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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