四川盆地天府气田简阳区块须四段致密砂岩储层特征及主控因素

doi:10.3969/j.issn.1672-7703.2025.02.003

摘要/Abstract

摘要： 天府气田简阳区块须四段作为四川盆地陆相近源致密气增储的新领域，其储层特征及主控因素的研究至关重要。通过铸体薄片、粒度分析、全岩、扫描电镜、高压压汞等手段，详细论述了储层基本特征及分类，并多方面系统分析了储层发育演化的主控因素。简阳区块须家河组四段发育三角洲—湖泊沉积体系，优质储层主要集中在三角洲前缘水下分流河道微相中。储层岩性以岩屑长石砂岩和长石岩屑砂岩为主，其中粒内、粒间溶孔发育频率较高；储层孔隙度主要分布在6%～8%之间，渗透率介于0.05～0.3mD。综合沉积相带、储层特征及裂缝发育程度等，建立了须四段致密砂岩储层Ⅰ—Ⅳ类分级评价标准，研究区以Ⅱ类裂缝—孔隙型储层为主。三角洲前缘水下分流河道和河口坝微相为储层发育奠定了基础，而生烃排酸期长石及岩屑等颗粒形成的粒内（间）溶孔是优质储层发育的关键，构造裂缝是对储层的重要补充。前陆斜坡带源储配置好，构造断裂发育，后期断裂活动改善的三角洲前缘水下分流河道和河口坝砂体是致密气的主要勘探方向。

关键词: 四川盆地, 简阳区块, 近源致密气, 致密砂岩, 储层特征, 储层分级, 主控因素

Abstract: The fourth member of Xujiahe Formation in Jianyang Block of Tianfu Gas Field is an emerging area for increasing reserves and production of near-source tight gas in Sichuan Basin, and the study of its reservoir characteristics and main controlling factors is very important. In this study, the basic characteristics and classification of reservoirs are discussed in detail by means of casting thin slice, particle size analysis, whole rock, scanning electron microscope and high-pressure mercury intrusion, and the main controlling factors of reservoir development and evolution are systematically analyzed in many aspects. The delta-lake sedimentary system is mainly developed in Xu 4 member of Jianyang Block, and the high-quality reservoirs are mainly concentrated in the microfacies of underwater diversion channel at the delta front. The reservoir lithology is mainly lithic feldspar sandstone and feldspar lithic sandstone, among which intragranular and intergranular dissolved pores develop frequently. The porosity of the reservoir is mainly distributed between 6 and 8%, and the permeability is between 0.05 mD and 0.3 mD. Based on the comprehensive sedimentary facies belt, reservoir characteristics and fracture development degree, the classification evaluation standard of Class Ⅰ-Ⅳ tight sandstone reservoirs in the fourth member of Xu Formation is established, and the study area is dominated by Class Ⅱ fracture-pore reservoirs. The microfacies of underwater diversion channel and estuary dam lay the foundation for reservoir development, and the intragranular (intergranular) dissolved pores formed by feldspar and cuttings during hydrocarbon generation and acid drainage period are the key to the development of high-quality reservoirs, and structural fractures are an important supplement to reservoirs. The main exploration direction of tight gas is the underwater diversion channel and estuary bar sand body in the delta front with good source-reservoir configuration, developed structural faults and improved fault activity in the foreland slope zone.

Key words: Sichuan Basin, Jianyang block, Near-source tight gas, Tight sandstone, Reservoir characteristics, Reservoir classification, Main controlling factor

中图分类号:

TE122

金值民, 杨跃明, 罗冰, 张奥博, 王小娟, 郑超, 朱华, 任利明, 杨羿. 四川盆地天府气田简阳区块须四段致密砂岩储层特征及主控因素[J]. 中国石油勘探, 2025, 30(2): 25-41.

Jin Zhimin, Yang Yueming, Luo Bing, Zhang Aobo, Wang Xiaojuan, Zheng Chao, Ren Liming, Yang Yi. Characteristics and main controlling factors of tight sandstone reservoirs in Xu 4 member of Jianyang block, Tianfu gas field, Sichuan Basin[J]. China Petroleum Exploration, 2025, 30(2): 25-41.

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