准连续型致密砂岩气藏地质条件和成藏特征——以鄂尔多斯盆地中部上古生界山西组为例

发布时间：2018-05-12 09:36

本文选题：致密砂岩气藏 + 准连续型　；参考：《兰州大学学报(自然科学版)》2017年03期

【摘要】：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.
[Abstract]:Based on a large amount of drilling, logging, logging and gas test data, combined with core observation and thin section identification, the petrological characteristics and diagenesis of the upper Paleozoic Shanxi formation quasi-continuous tight sandstone reservoir in Ordos Basin are studied. The physical characteristics and pore phenological characteristics of Shanxi formation are analyzed synthetically, and the reservoir forming characteristics of Shanxi formation are studied from four aspects: source rock characteristics, reservoir cap assemblage characteristics and reservoir forming model. The results show that Shanxi formation of Upper Paleozoic in Ordos Basin belongs to quasi-continuous tight sandstone gas reservoir. The source rocks generated a lot of gas at the end of the early Cretaceous, with near-source reservoir formation, large area quasi-continuous distribution of sand body, tight reservoir and many diagenetic types. The pore throat structure is complex, the physical property is generally poor, and the source rock type is good. In the lower part of Shanxi formation, high quality hydrocarbon source rocks are mainly developed in the lower part of the formation, and the upper part is mainly a compact reservoir. Natural gas enters the tight reservoir through microfractures and then forms a reservoir, which is distributed in a quasi-continuous manner. A comprehensive analysis of the upper Paleozoic Shanxi formation in Ordos Basin shows that the gas resources of the quasi-continuous tight sandstone have great potential and have a broad prospect of exploration.
【作者单位】：长安大学地球科学与资源学院;西安石油大学地球科学与工程学院;陕西延长石油(集团)有限责任公司;咸阳西北有色七一二总队有限公司;
【基金】：国家自然科学基金项目(41102083)
【分类号】：P618.13

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