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

叶尔纳尔·吉格尔别克; 胡文瑄; 康逊; 刘文栋; 张文杰

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

doi: 10.11781/sysydz2025051063

1. 南京大学地球科学与工程学院, 南京 210008;
2. 中南大学地球科学与信息物理学院, 长沙 410083

基金项目:

国家自然科学基金项目(42372166)资助。

详细信息

作者简介:
叶尔纳尔·吉格尔别克(1998—)，男，硕士生，从事石油地质研究。E-mail:1445864868@qq.com。

通讯作者:
胡文瑄(1959—)，男，博士，教授，从事能源地质学研究。E-mail:huwx@nju.edu.cn。

中图分类号: TE122.22
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出版历程
- 收稿日期: 2025-02-19
- 修回日期: 2025-07-16
- 刊出日期: 2025-09-28

Reservoir differences and genesis between Upper Permian Upper Wuerhe Formation and Lower Triassic Baikouquan Formation in Mahu Sag, Junggar Basin

1. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210008, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha, Hunan 410083, China

摘要

摘要: 砂砾岩是重要的油气储层类型，储层差异及成因研究有助于揭示砂砾岩储层主控因素与成藏机制，对油气储层预测及勘探部署具有指导意义。以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两套不整合接触的砂砾岩储层为研究对象，通过岩心观察、岩矿鉴定、扫描电镜分析、主量元素测试及碎屑锆石U-Pb测年等方法，系统对比两套储层在岩石学与储集性方面的特征，明确二者在母岩组成、胶结物类型、储集空间及物性上的显著差异。准噶尔盆地玛湖凹陷上二叠统上乌尔禾组砾石以中基性岩浆岩屑和凝灰岩屑为主，胶结物以沸石和方解石为主，储集空间成因类型主要为浊沸石溶蚀孔；下三叠统百口泉组砾石成分则以长英质为主，方解石非均质胶结，储集空间成因类型主要为长石溶蚀孔。沉积物源不同是导致两套储层骨架颗粒和胶结物差异的根本原因，后期酸性流体活动及差异性水岩作用进一步影响了储层的储集空间类型和组合。准噶尔盆地玛湖凹陷上二叠统上乌尔禾组与下三叠百口泉组优质储层主要发育于扇三角洲前缘相带水下分流河道沉积微相中，沉积微相控制储层原始孔隙结构，母岩成分、沉积演化、成岩作用及断裂活动共同影响储层发育特征及物性分布。
- 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
Abstract: A conglomerate is an important type of oil and gas reservoir. Analyzing its heterogeneity and genesis is conducive 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 distributary 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.
- conglomerate reservoirs /
- reservoir characteristics /
- reservoir genesis /
- diagenesis /
- Upper Wuerhe Formation /
- Baikouquan Formation /
- Mahu Sag /
- Junggar Basin

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参考文献(44)

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