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吐格尔明下侏罗统阿合组为典型的辫状三角洲沉积 ,可分成三角洲平原和三角洲前缘亚相 ,沉积微相主要有辫状河道、水下分流河道、心滩和河口坝 ,沉积方式主要为侧积、填积、垂积和前积。储层层间非均质性受控于沉积微相 ,不同沉积微相砂体具有明显不同的孔渗值。三角洲平原亚相的辫状河道砂体物性最好 ,水下分流河道砂体、心滩砂体次之 ,三角洲前缘亚相的河口坝砂体最差。储层层内非均质性与沉积方式密切相关 ,侧积和填积而成的辫状河道砂体和水下分流河道砂体 ,,其渗透率成正韵律分布 ,最高渗透率段在底部 ,但辫状河道砂体渗透率最高值明显大于水下分流河道砂体 ;由垂积而成的心滩砂体 ,其渗透率在纵向上形成无规则的分布 ;由前积而成的河口坝砂体 ,其渗透率成反韵律分布 ,最高渗透率段在顶部。
The Lower Jurassic Yagu Formation in the Dugue Ming Formation is a typical braided delta deposit that can be divided into delta plain and delta front subfacies. The sedimentary microfacies include braided channels, underwater distributary channels, heart beaches and estuarine dams. Sedimentary methods are mainly side product, fill plot, vertical plot and plot. Inter-reservoir heterogeneity is controlled by sedimentary microfacies, and different sedimentary microfacies sand bodies have significantly different pore permeability values. The braided channel sand bodies of deltaic subfacies in delta plain are the best, followed by underwater distributary channel sand body and heart beach sand body, and the delta mouth sand body of delta front is the worst. The in-reservoir heterogeneity is closely related to the sedimentary mode. The braided channel sand body and the subaqueous distributary channel sand body formed by lateral product and sedimentation have a positive rhythm distribution with the highest permeability section at the bottom, However, the highest permeability of braided channel sand body is obviously higher than that of underwater distributary channel sand body. The heart sand body formed by vertical sedimentation has irregular distribution in vertical direction. The estuarine dam Sand body, its permeability is inverse rhythm distribution, the highest permeability section at the top.