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物源区原始剥蚀地貌的恢复以及与砂体、优质储层之间的关系是源-汇系统分析中非常重要的部分.利用钻井、三维地震以及分析化验等资料,恢复了石臼坨凸起东段围区沙一二段储层的古物源分布,并探讨了古物源对储层的影响.结果表明:(1)研究区沙一二段发育近源扇三角洲砂砾岩储层,东部古物源的母岩类型为白垩系中酸性火成岩,西部古物源的母岩类型为中生界碎屑岩夹薄层中酸性火成岩,均非现今残留的基岩分布.(2)受母岩差异的影响,东部火成岩的母岩剥蚀后更容易形成规模较大的砂砾岩体.(3)受物源区母岩和沉积区储层成岩作用差异的共同影响,东部储层中中酸性火成岩岩屑和砾石等易溶组分含量高,粒度较粗,以碳酸盐胶结为主,在成岩过程中,中酸性火成岩砾石、岩屑易遭受强烈溶蚀作用,次生孔隙发育,但受碳酸盐矿物进一步强烈的胶结,储层物性呈低孔低渗特点;西部储层中变质岩岩屑和石英等难溶组分含量高,填隙物以粘土类为主,原生孔隙发育,储层物性呈中高孔高渗的特点.
The restoration of the original denuded landform in the provenance area and its relationship with sand bodies and high-quality reservoirs is a very important part of the source-sink system analysis.Based on the data of drilling, 3D seismic analysis and laboratory analysis, The distribution of ancients in the first and second member of Shahejie formation is discussed and the influence of the ancient provenance on the reservoir is discussed.The results show that: (1) the sandstone and conglomerate reservoirs are developed in the first and second member of Shahejie formation in the study area, Of the parent rocks are of Cretaceous medium-acidic igneous rocks, and the source rocks of the western provenance are of acidic igneous rocks in the Mesozoic clastic rocks, both of which are not present. (2) Influenced by the difference of the parent rocks (3) Due to the difference of diagenesis between the parent rock and the sedimentary area in the provenance area, the middle and acidic igneous rock cuttings in the eastern reservoir and Gravel and other soluble components of high content, coarse grain size, mainly carbonate cementation, diagenetic process, moderately acidic igneous gravel, debris susceptible to strong erosion, secondary porosity, but by the carbonate minerals Further strong cementation, reservoir properties were low Low permeability characteristics; West insoluble component content of high reservoir rocks and other debris and quartz, clay class-based fillings, primary pores developed, reservoir property as a characteristic of high porosity and permeability.