摘要:通过铸体薄片、扫描电镜、X-衍射、高压压汞等分析测试方法，系统研究了鄂尔多斯盆地苏里格东三区盒8段砂岩岩石学特征、成岩作用序列，并对孔隙演化过程进行了定量化分析。研究认为，盒8段储层砂岩类型主要为岩屑石英砂岩、岩屑砂岩、石英砂岩，结构成熟度较高，孔隙类型主要为溶蚀孔隙、剩余粒间孔隙；储层砂岩经历了压实、压溶、溶蚀、交代及破裂多种成岩作用，已达到中成岩阶段B期。早成岩阶段的压实作用损失了24.2%的孔隙度，是导致孔隙度降低的主要原因；早成岩B期—中成岩A期在酸性成岩环境下易溶组分溶解形成的次生溶孔增加了0.3%～5.6%的孔隙度，高岭石的交代作用产生的晶间孔也成为储集体空间的重要构成。
关键词: 鄂尔多斯盆地/
苏里格东三区/
盒8段/
成岩作用/
孔隙演化
Abstract:Based on a series of analytical tests, such as casting thin sections, SEM, X-ray diffractions and high pressure Hg injection, we systematically studied petrologic characteristics, diagenesis sequence of reservoir sandstone of He8 section in the East Ⅲ part of Sulige, also with a quantitative analysis of porosity evolution. The research shows the reservoir sandstone mainly consists of lithic quartz sandstone, lithic sandstone and a smaller amount of quartz sandstone with a high textural maturity, of which the accumulation space is dominated by dissolution and residual intergranular pores. The diagenesis includes burial compaction, cementation, corrosion, alteration and rupturing, and has reached the middle diagenetic stage B. The compaction in the early diagenetic stage leads to a sharp decline with a loss of 24.2% of the initial porosity. The porosity of the secondary dissolution pores formed by the corrosion of the soluble components in the acid diagenetic environment increased by 0.3%～5.6% from the early diagenetic B to middle diagenetic stage A. Besides, the intergranular produced by the metasomatism of kaolinite also contributes alot to the reservoir space.
Key words:Ordos Basin/
The East Ⅲ part of Sulige/
He8 section/
Diagenesis/
Porosity evolution
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