石油实验地质2025，Vol.47Issue(5)：1063-1074,12.DOI:10.11781/sysydz2025051063
准噶尔盆地玛湖凹陷上二叠统上乌尔禾组与下三叠统百口泉组储层差异及成因
Reservoir differences and genesis between Upper Permian Upper Wuerhe Forma-tion and Lower Triassic Baikouquan Formation in Mahu Sag,Junggar Basin
摘要
Abstract
A conglomerate is an important type of oil and gas reservoir.Analyzing its heterogeneity and genesis is condu-cive to identifying main controlling factors and hydrocarbon accumulation mechanisms of conglomerate reservoirs,thereby providing guidance for oil and gas reservoir prediction and exploration deployment.This study focuses on two sets of conglomerate reservoirs from the Upper Permian Upper Wuerhe Formation and the Lower Triassic Baikouquan Formation in the Mahu Sag of the Junggar Basin,which are in unconformity contact.Based on core observations,petrographic identification,scanning electron microscopy(SEM),major element analysis,and detrital zircon U-Pb dating,the lithology and reservoir capacity of the two sets of reservoirs were systematically compared.The significant differences in parent rock composition,cement types,and reservoir space and properties of these two reservoirs were identified.The gravels of the Upper Permian Upper Wuerhe Formation in the Mahu Sag of the Junggar Basin were mainly composed of medium-basic igneous rock debris and tuff debris,the cements were mainly zeolite and calcite,and the dominant reservoir space was laumontite dissolution pores.In contrast,the gravels of the Lower Triassic Baikouquan Formation were mainly felsic in composition,the calcite exhibited heterogeneous cementation,and the dominant reservoir space was feldspar dissolution pores.Differences in sediment provenance were the fundamental cause of variations in framework grains and cements between the two sets of reservoirs,and the subsequent acidic fluid activities and differential water and rock interactions further influenced reservoir space types and assemblages.High-quality reservoirs in both formations predominantly developed in subaqueous distribu-tary channel depositional microfacies within the fan-delta front facies belt.Depositional microfacies controlled the original pore structure,while parent rock composition,sedimentary evolution,diagenesis,and fault activities jointly shaped the development characteristics and physical property distribution of the reservoirs.关键词
砂砾岩储层/储层特征/储层成因/成岩作用/上乌尔禾组/百口泉组/玛湖凹陷/准噶尔盆地Key words
conglomerate reservoirs/reservoir characteristics/reservoir genesis/diagenesis/Upper Wuerhe Formation/Baikouquan Formation/Mahu Sag/Junggar Basin分类
能源科技引用本文复制引用
叶尔纳尔·吉格尔别克,胡文瑄,康逊,刘文栋,张文杰..准噶尔盆地玛湖凹陷上二叠统上乌尔禾组与下三叠统百口泉组储层差异及成因[J].石油实验地质,2025,47(5):1063-1074,12.基金项目
国家自然科学基金项目(42372166)资助. （42372166）
