鄂尔多斯盆地周家湾长6和长8油层组成藏控制因素

发布时间：2018-11-20 11:02

【摘要】：探讨鄂尔多斯盆地周家湾地区三叠系延长组长6、长8层成藏主控因素及成藏模式。从长7烃源岩生排烃影响原油运聚及长6、长8沉积、成岩的差异性研究入手,总结成藏差异。结果表明,长7大面积分布的烃源岩为成藏提供了物质基础和运移动力;该区发育的长6、长8连通性砂体和构造裂缝提供了运移输导条件;长6、长8大规模叠置砂体形成了良好的储集体;沉积、成岩差异形成的相对高孔高渗储层发育区控制着油藏富集区的分布。长6层成藏模式表现为长7油源先向上运移至长6成藏,而后侧向沿连通砂体继续运聚成藏,直至扩展到远离长7烃源岩分布区,形成沿北东向砂体大面积展布的油藏;长8层成藏模式则主要为长7烃源岩向下运聚成藏,二次侧向运移较少,油藏面积较小。
[Abstract]:This paper discusses the main factors and model of reservoir formation in Yanchang formation of Triassic in Zhoujiawan area of Ordos Basin. The differences of hydrocarbon generation and expulsion from source rocks of Chang7 source rocks affecting oil migration and accumulation as well as the deposition and diagenesis of Chang 6 and Chang 8 are studied and the difference of reservoir formation is summarized. The results show that the source rocks with large area distribution in Chang7 provide the material foundation and migration power for the reservoir formation, and the Chang 6, Chang 8 connective sandbodies and structural fractures in this area provide the conditions of migration and transportation. The large scale superimposed sand bodies Chang 6 and Chang 8 formed a good reservoir mass, and the relatively high porosity and high permeability reservoirs developed by sedimentary and diagenetic differences controlled the distribution of reservoir rich areas. The model of Chang 6 reservoir formation shows that Chang 7 oil source first moves upward to Chang 6 reservoir, then lateral migration and accumulation along the connected sand body, until it extends far away from Chang 7 source rock distribution area and forms a large area distribution reservoir along the north to east direction sand body; The Chang 8 reservoir formation model is mainly composed of Chang 7 source rock migration and accumulation, less secondary lateral migration and smaller reservoir area.
【作者单位】：中国石油长庆油田分公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：国家自然科学基金重大项目(41390451) “十三五”国家油气重大专项(2016ZX05046) 国家“973”项目(2014CB239003)
【分类号】：P618.13

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