赵鹏飞,孙藏军,康凯,等. 石臼坨凸起西段东三段储层差异成岩演化及孔隙定量表征[J]. 海洋地质前沿,2022,38(10):42-50. DOI: 10.16028/j.1009-2722.2022.137
    引用本文: 赵鹏飞,孙藏军,康凯,等. 石臼坨凸起西段东三段储层差异成岩演化及孔隙定量表征[J]. 海洋地质前沿,2022,38(10):42-50. DOI: 10.16028/j.1009-2722.2022.137
    ZHAO Pengfei, SUN Cangjun, KANG Kai, et al. Differential diagenetic evolution and quantitative characterization of pores in the third Member of Dongying Formation in the western section of Shijiutuo Uplift[J]. Marine Geology Frontiers, 2022, 38(10): 42-50. DOI: 10.16028/j.1009-2722.2022.137
    Citation: ZHAO Pengfei, SUN Cangjun, KANG Kai, et al. Differential diagenetic evolution and quantitative characterization of pores in the third Member of Dongying Formation in the western section of Shijiutuo Uplift[J]. Marine Geology Frontiers, 2022, 38(10): 42-50. DOI: 10.16028/j.1009-2722.2022.137

    石臼坨凸起西段东三段储层差异成岩演化及孔隙定量表征

    Differential diagenetic evolution and quantitative characterization of pores in the third Member of Dongying Formation in the western section of Shijiutuo Uplift

    • 摘要: 为了定量评价成岩作用对石臼坨凸起西段X-1井区东三段不同粒级储层孔隙发育的影响,利用铸体薄片、扫描电镜、常规物性、X射线衍射等资料,分析了不同粒级储层孔隙演化的差异及原因。结果表明,中-粗砂岩以较高含量的自生高岭石和次生溶蚀孔发育为特征,砂砾岩胶结物含量中等,但次生溶蚀孔较发育,细砂岩胶结物和次生溶蚀孔欠发育。中-粗砂岩经历的成岩作用类型较完整,砂砾岩整体具有较弱压实、弱溶蚀、弱胶结的成岩特征,而细砂岩以压实作用为主,中成岩A期溶蚀、胶结作用基本不发育。东三段同生期-早成岩B期以机械压实为主,对细砂岩孔隙演化影响最大;中成岩A期早期以溶蚀作用为主,对中-粗砂岩溶蚀增孔效应最明显;中成岩A期晚期以含铁碳酸盐胶结为特色,对中-粗砂岩孔隙演化的影响较大,但其总体孔隙度仍然最高。东三段不同粒级储层中的中-粗砂岩平均孔隙度为15.1%,砂砾岩为13.4%,细砂岩为8.9%。由于中-粗砂岩受压实影响较弱,溶蚀作用最强,故孔隙最为发育;砂砾岩虽然受压实作用较弱,但由于孔隙结构复杂,非均质性强,限制了成岩流体的活动性,影响了储层的溶蚀作用强度;细砂岩泥质含量较高,受压实作用影响最大,孔隙发育相对最差。该研究对于中国湖盆近源快速堆积背景下中深层有效储层的预测与评价具有参考价值。

       

      Abstract: In order to quantitatively evaluate the influence of diagenesis on the pore development of different grain size reservoirs in the third Member of Dongying Formation of Well X-1 in the western section of Shijiutuo Uplift, the differences in pore evolution of different grain size reservoirs and their causes were analyzed by using cast thin sections, scanning electron microscopy, conventional physical properties and X-ray diffraction data.The results show that the middle-coarse grained sandstone is characterized by high content of authigenic kaolinite and secondary dissolution pores, the content of glutenite cements is medium but the secondary dissolution pores are relatively developed, and the fine-grained sandstone cements and secondary dissolution pores are underdeveloped. The diagenesis type of medium-coarse grained sandstone is relatively complete, and the sandstone is characterized by weak compaction, weak dissolution and weak cementation, while the fine-grained sandstone is dominated by compaction, and the dissolution and cementation of the mid-diagenetic stage A are not developed. From syngenetic stage to early diagenetic stage B, the diagenesis of the third Member of Dongying Formation is mainly mechanical compaction, which has the greatest influence on pore evolution of fine-grained sandstone. In the late stage A of middle diagenesis, it is characterized by iron-bearing carbonate cementation, which has A great influence on the pore evolution of middle-coarse grained sandstone, but its overall porosity is still the highest. The average porosity of the medium-coarse grained sandstone is 15.1%, 13.4% for conglomerate and 8.9% for fine-grained sandstone. Medium-coarse-grained sandstone has weak compaction effect, the strongest dissolution effect and the most developed pores. Although the compaction of conglomerate is weak, due to the complex pore structure and strong heterogeneity, the activity of diagenetic fluid is limited and the dissolution intensity of reservoir is affected. The fine-grained sandstone has high mud content, and the influence of compaction is the biggest, but the pore development is relatively worst. The research results have reference value for the prediction and evaluation of middle-deep effective reservoirs under the background of rapid accumulation near lacustrine basin in China.

       

    /

    返回文章
    返回