鄂尔多斯盆地神府区块煤系致密砂岩气储层特征、成岩作用与主控因素

doi:10.3969/j.issn.1672-7703.2025.05.004

摘要/Abstract

摘要： 鄂尔多斯盆地神府区块本溪组及太原组致密气取得勘探发现，了解其储层特征及主要控制因素，对实现煤系致密砂岩气的高效开发具有重要意义。基于岩石学、铸体薄片、扫描电镜、高压压汞等实验测试手段，对神府区块太原组—本溪组致密砂岩储层岩石类型、储层物性、成岩作用等展开分析，并据此讨论影响储层发育的主控因素。本溪组和太原组砂岩储层岩性主要为石英砂岩、岩屑石英砂岩和长石岩屑砂岩，主要储集空间类型为粒内溶孔、粒间溶孔、晶间孔、基质溶孔及微裂缝，其次为原生残余孔，喉道多呈细—中型喉道；压实作用与部分胶结作用对砂岩储层表现为破坏性作用，而溶蚀、构造作用与绿泥石薄膜具有建设性作用。太原组—本溪组砂岩储层发育受沉积微相控制明显，三角洲水下分流河道与潮汐水道沉积微相有利于优质储层的发育，而岩屑的溶蚀作用、构造作用产生的微裂缝以及绿泥石薄膜对致密砂岩储层物性具有改善作用；优质储集砂体主要分布于解家堡东南部与栏杆堡南部水下分流河道及潮道发育地区。

关键词: 鄂尔多斯盆地, 神府区块, 太原组—本溪组, 致密气, 储层特征, 成岩作用, 主控因素

Abstract: The tight gas discoveries have been made in Benxi Formation and Taiyuan Formation in Shenfu block, Ordos Basin. A better understanding of reservoir characteristics and the main controlling factors is of great significance for the high-efficiency development of coal measure tight sandstone gas. Based on petrology, cast thin section, scanning electron microscopic imaging and high pressure mercury injection test methods, the rock types, reservoir physical properties and diagenesis of tight sandstone reservoirs in Taiyuan Formation–Benxi Formation in Shenfu block have been analyzed, and the main controlling factors affecting reservoir development have been discussed. The study results show that the reservoir lithology of Benxi Formation and Taiyuan Formation is mainly composed of quartz sandstone, lithic quartz sandstone and feldspar lithic sandstone. The main reservoir space types include intragranular dissolution pores, intergranular dissolution pores,intercrystal pores, matrix dissolution pores and micro fractures, followed by primary residual pores, and the throats are mostly fine–medium throats. Compaction and partial cementation had destructive effects on sandstone reservoirs, while dissolution, tectonic activities and chlorite film had constructive effects. The development of sandstone reservoirs in Taiyuan Formation–Benxi Formation was significantly controlled by sedimentary microfacies. The delta underwater distributary channel and tidal channel microfacies were conducive to the development of high-quality reservoirs, and the physical properties of tight sandstone reservoirs were further improved by lithic dissolution, micro-fractures generated by tectonic activities and chlorite films. The high-quality reservoir sand bodies are mainly distributed in the southeastern Xiejiapu and the southern Langanpu areas with underwater distributary channels and tidal channels developed.

Key words: Ordos Basin, Shenfu block, Taiyuan Formation–Benxi Formation, tight gas, reservoir characteristics, diagenesis, main control factor

中图分类号:

TE122

刘彦成, 梅啸寒, 田继军, 刘博元, 袁隐, 王大兴. 鄂尔多斯盆地神府区块煤系致密砂岩气储层特征、成岩作用与主控因素[J]. 中国石油勘探, 2025, 30(5): 38-54.

Liu Yancheng, Mei Xiaohan, Tian Jijun, Liu Boyuan, Yuan Yin, Wang Daxing. Reservoir characteristics, diagenesis and main controlling factors for coal measure tight sandstone gas in Shenfu block, Ordos Basin[J]. China Petroleum Exploration, 2025, 30(5): 38-54.

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