沉积与特提斯地质2026，Vol.46Issue(1)：107-123,17.DOI:10.19826/j.cnki.1009-3850.2025.08007
鄂尔多斯盆地北部大牛地气田A区山西组致密砂岩储层质量层间差异成因研究
Genesis of interlayer reservoir quality differences in tight sandstones of the Shanxi Formation,Block A,Daniudi Gas Field,northern Ordos Basin
摘要
Abstract
The Shanxi Formation is a key target for tight sandstone gas exploration in the northern Ordos Basin.However,significant heterogeneities in reservoir development among sub-members hinder further exploration.To improve the understanding of the Shanxi Formation reservoir characteristics and clarify the genesis of interlayer reservoir quality differences,this study focuses on Block A of the Daniudi Gas Field in the northern Ordos Basin.Core observation,thin-section identification,scanning electron microscopy(SEM),cathodoluminescence(CL),and high-pressure mercury injection(HPMI)tests were used to investigate sandstone composition,pore types,reservoir properties,and diagenetic processes.The results show:(1)The Shanxi Formation mainly comprises lithic quartz sandstones with high lithic fragment and matrix contents.Intragranular and intergranular dissolution pores constitute the main reservoir space.Intragranular pores develop within the lithic fragments,while intergranular pores are intercrystalline micropores formed through the dissolution and alteration of the tuffaceous matrix.(2)Compaction is the primary destructive diagenetic process in the Shanxi Formation,leading to the disappearance of original pores.Dissolution is the primary constructive diagenetic process,with a marked weakening trend from type-I to type-Ⅲ reservoirs.Cementation also influences reservoir properties.(3)Reservoir quality differences are controlled by the depositional system,sandstone thickness,components,and diagenesis.The S2-2 sub-member exhibits the best reservoir conditions,followed by S2-1,with S1-1 being moderate,and S1-2 and S1-3 being the least favorable.This study clarifies the genesis of reservoir quality differences among sub-members of the Shanxi Formation,enhancing the understanding of tight sandstone reservoirs in the northern basin and providing a theoretical basis for precise development and well placement.关键词
成岩作用/致密砂岩/储层特征/山西组/鄂尔多斯盆地Key words
diagenesis/tight sandstone/reservoir characteristics/Shanxi Formation/Ordos Basin分类
能源科技引用本文复制引用
冉辉,张铭凯,张泽,郭颖,王照周,陈郭平,肖杨,李楚楚..鄂尔多斯盆地北部大牛地气田A区山西组致密砂岩储层质量层间差异成因研究[J].沉积与特提斯地质,2026,46(1):107-123,17.基金项目
国家自然科学基金项目(42102135,42072140,52104022) （42102135,42072140,52104022）
重庆市教育委员会科学技术研究项目(KJQN202201549,KJZD-M202101502) （KJQN202201549,KJZD-M202101502）
中国石油化工股份有限公司科技项目(P23031) （P23031）
重庆科技大学研究生创新计划项目(YKJCX2420115) （YKJCX2420115）
