鄂尔多斯盆地华庆地区长81成岩作用特征研究
DIAGENESIS OF CHANG 8 1 RESERVOIR, HUAQING AREA, ORDOS BASIN
孔祥超1 赵俊兴1,2 申赵军1
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DOI：
作者单位：1.成都理工大学沉积地质研究院2.“油气藏地质及开发工程国家重点实验室”·成都理工大学
中文关键字：成岩作用 华庆地区 长81储层砂岩 鄂尔多斯盆地 绿泥石
英文关键字：diagenesis, Huaqing area, Chang 8 1 sandstone reservoir, Ordos Basin, chlorite
中文摘要： 通过对研究区砂岩扫描电镜、铸体薄片及物性资料的分析，认为华庆地区长
81砂岩类型以岩屑长石砂岩、长石岩屑砂岩为主，碎屑颗粒具有分选中等、磨圆差、成分成熟度低、结构成熟度高的特点，为典型的低孔、低渗储层；对储层成岩作用研究表明，压实作用和胶结作用强烈破坏了砂岩的原生孔隙，绿泥石胶结对原生孔隙起到一定的保护作用，溶蚀作用与破裂作用有效的改善了储层的孔隙结构；建立了该地区成岩作用演化序列，认为长
81储层砂岩的成岩阶段处于成岩
A期。
英文摘要： Based on the analysis on scanning electron microscope, casting thin section and physical property for Chang 8 1 sandstone of Huanqing area, it is considered that (1) this reservoir is mainly composed of lithic arkose and feldspathic litharenite; (2) their clastic particles are mid-sorted and under-rounded, featured by low component maturity and high structure maturity; and (3) it is a typical low-porosity and low-permeability reservoir. In addition, a study on diagenesis is carried out which shows that both compaction and cementation may destroy the primary pores intensively whereas chlorite cementation can protect them to a certain degree, and dissolution and cataclasis can also improve the pore structure effectively. After establishing an evolution sequence of diagenesis in this area, it is considered that Chang 8 1 sandstone reservoir is in diagenetic A phase.