三塘湖盆地芦草沟组细粒岩储集层微观特征

doi:10.7657/XJPG20230305

摘要/Abstract

摘要：

针对火山活动发育层系细粒岩成分复杂、胶结致密、非均质性强等特点，系统梳理了细粒岩概念和分类方法，结合岩石薄片鉴定、全岩X射线衍射、电镜能谱等实验，开展了三塘湖盆地芦草沟组细粒岩岩石学特征、储集空间类型及储集空间成因分析。结果表明，芦草沟组细粒岩储集层岩石以细粒碳酸盐岩类和细粒火山碎屑岩类为主；储集空间主要为裂缝和孔隙，裂缝以构造缝和层间缝为主，细粒火山碎屑岩类显孔普遍较发育，主要有火山尘溶孔、岩屑溶孔、晶屑溶孔和方解石脉溶孔；细粒碳酸盐岩类显孔不发育，微纳米孔较发育，主要为白云石晶间孔、方解石晶间孔、黏土矿物晶间孔等；火山物质富集是火山活动发育层系细粒岩储集性能好的物质基础，多种细粒岩纹层交互发育有利于微孔—微裂缝储集空间形成。

关键词: 三塘湖盆地, 芦草沟组, 细粒岩, 储集层, 微观特征, 储集空间

Abstract:

The fine-grained rocks in volcanic-active strata are characterized by complex composition, tight cementation, and strong heterogeneity. The concept and classification methods of fine-grained rocks were systematically reviewed. Combined with rock thin section identification, whole-rock X-ray diffraction (XRD) experiment, and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) experiment, a method for studying the microscopic characteristics of fine-grained reservoirs was established. By using this method, the petrological characteristics, and types and genesis of reservoir spaces of the fine-grained rocks in the Lucaogou formation of the Santanghu basin were analyzed. The results show that the fine-grained reservoirs in the Lucaogou formation are mainly composed of fine-grained carbonate rocks and fine-grained volcanoclastic rocks. The reservoir space is mainly contributed by fractures and pores, and the fractures are dominantly structural fractures and interbed. Fine-grained volcanoclastic rocks generally have volcanic dust solution pores, rock debris solution pores, crystal debris solution pores, and calcite vein solution pores. Micro-nanopores are relatively developed in fine-grained carbonate rocks, including dolomite intercrystalline pores, calcite intercrystalline pores, and clay mineral intercrystalline pores. The enrichment of volcanic material provides material basis for high-quality fine-grained reservoirs in volcanic-active strata, and the alternation of various laminae in fine-grained reservoirs is conducive to the formation of micropores and microfractures.

Key words: Santanghu basin, Lucaogou formation, fine-grained rock, reservoir, microscopic characteristic, reservoir space

中图分类号:

TE122

秦恩鹏, 张君莹, 张生兵, 刘俊田, 张小芹, 陈永慧. 三塘湖盆地芦草沟组细粒岩储集层微观特征[J]. 新疆石油地质, 2023, 44(3): 299-306.

QIN Enpeng, ZHANG Junying, ZHANG Shengbing, LIU Juntian, ZHANG Xiaoqin, CHEN Yonghui. Microscopic Characteristics of Fine-Grained Reservoirs in Lucaogou Formation, Santanghu Basin[J]. Xinjiang Petroleum Geology, 2023, 44(3): 299-306.

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