石臼坨凸起东段围区沙一二段古物源恢复及其对储层的控制

发布时间：2018-07-15 20:15

【摘要】：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.
[Abstract]:The restoration of the original denudation geomorphology in the provenance area and the relationship with the sand body and the high quality reservoir are very important parts in the source-sink system analysis. Based on the data of drilling, 3D seismic analysis and laboratory analysis, the distribution of antiquities and the influence of antiquities on the reservoir of the first and second member of the Shaheyi formation in the eastern section of the Shiyutuo uplift have been restored, and the influence of the antiquities on the reservoir has been discussed. The results are as follows: (1) the sandy gravel reservoir of the near source fan delta is developed in the first and second member of the study area. The source rock type of the eastern ancient source is Cretaceous intermediate acid igneous rock, and the source rock type of the western ancient material source is Mesozoic clastic rock intercalated with thin layer intermediate acid igneous rock. (2) affected by the difference of parent rock, the parent rock of eastern igneous rock is more likely to form large sand gravel after denudation. (3) affected by the difference of diagenesis between parent rock and reservoir in source area, In the eastern reservoir, the soluble components such as acid igneous rock debris and gravel have high content and coarse granularity, mainly carbonate cementation. In the diagenetic process, the intermediate acid igneous gravel is prone to strong dissolution and secondary pores are developed. However, due to the further strong cementation of carbonate minerals, the physical properties of the reservoirs are characterized by low porosity and low permeability, and in the western reservoirs, the contents of insoluble components such as metamorphic rock cuttings and quartz are high, the interstitial materials are mainly clay, and the primary pores are developed. Reservoir physical properties are characterized by medium high porosity and high permeability.
【作者单位】：中海石油(中国)有限公司天津分公司渤海石油研究院;
【基金】：国家“十三五”科技重大专项(No.2016ZX05024-003)
【分类号】：P618.13

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