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通过大量钻井、测井、录井以及试气资料,结合岩心观察和薄片鉴定,对鄂尔多斯盆地上古生界山西组准连续型致密砂岩储层的岩石学特征、成岩作用、物性特征和孔候特征进行综合分析,并对山西组的成藏特征从烃源岩特征、储层特征、储盖组合特征以及成藏模式4个方面进行研究.结果表明:鄂尔多斯盆地上古生界山西组属于准连续型致密砂岩气藏,烃源岩在早白垩世末大量生气,具有近源成藏、砂体大面积准连续分布、储层致密、成岩作用类型多、孔喉结构复杂、物性普遍较差、烃源岩类型好等特征.山西组下部主要广覆式发育优质烃源岩,上部主要为致密储层,天然气通过微裂缝进入致密储层中进而成藏,在地层中呈准连续分布.综合分析鄂尔多斯盆地上古生界山西组准连续型致密砂岩气资源潜力大,具有广阔的勘探前景.
Through a large number of drilling, logging, logging and test gas data, combined with core observation and slice identification, the petrological characteristics, diagenesis, physical properties and pore-surface features of the quasi-continuous tight sandstone reservoirs in the Upper Paleozoic in the Ordos Basin The authors made a comprehensive analysis of the reservoir forming characteristics of Shanxi Formation from four aspects: source rock characteristics, reservoir characteristics, reservoir-cap assemblage characteristics and reservoir forming patterns. The results show that the Upper Paleozoic Shanxi Formation in the Ordos Basin belongs to quasi-continuous Tight sandstone gas reservoirs and hydrocarbon source rocks were abundant in the Early Cretaceous, with near-source reservoir formation, large-area quasi-continuous distribution of sand bodies, dense reservoirs, more diagenesis types, complicated pore-throat structures and generally poor physical properties. Hydrocarbons The source rock types are good, and the lower part of Shanxi Formation is mainly composed of high-quality source rocks with extensive rifting. The upper part is mainly composed of tight reservoirs. Natural gas enters the tight reservoirs through microfractures and then accumulates into reservoirs and distributes quasi-continuously in the strata. The Ordos Basin Upper Paleozoic Shanxi group of quasi-continuous tight sandstone gas resources have great potential and have broad exploration prospects.