玛湖凹陷—沙湾凹陷中—下二叠统富火山碎屑砂砾岩储层成因

doi:10.7657/XJPG20260103

摘要/Abstract

摘要：

沸石胶结物的成因差异造成了储层储集空间类型多样、成分复杂且非均质性强。为探究其对储集空间产生的影响，综合运用岩心观察、薄片鉴定、电镜扫描、全岩X射线衍射分析及能谱分析等手段，宏观、微观相结合对玛湖凹陷—沙湾凹陷中—下二叠统沸石胶结物类型、形成机制及储集空间类型进行了系统对比分析与研究，结果表明：碎屑成分差异控制着沸石胶结物类型及成因，玛湖凹陷和沙湾凹陷风城组和夏子街组沸石胶结物成因是凝灰岩火山玻璃水化作用；中拐凸起和车排子凸起佳木河组沸石胶结物由斜长石钠长石化形成。而沸石胶结物成因差异又造成了储集空间类型分异，玛湖凹陷和沙湾凹陷风城组和夏子街组沸石胶结物演化过程伴随胶结物密度改变和结晶水释放，易形成粒缘缝；中拐凸起和车排子凸起佳木河组由于浊沸石与方解石的溶蚀，储集空间以溶孔为主。

关键词: 准噶尔盆地, 玛湖凹陷, 沙湾凹陷, 二叠系, 沸石胶结物, 储集空间

Abstract:

The genetic differences of zeolite cements lead to diverse pore space types, complex composition, and strong heterogeneity of reservoirs. To investigate their impacts on reservoir space, this study systematically compares and analyzes the types and formation mechanisms of zeolite cements, and reservoir space in the Lower-Middle Permian strata of the Mahu and Shawan sags by integrating macroscopic and microscopic approaches such as core observation, thin-section analysis, scanning electron microscopy (SEM), whole-rock X-ray diffraction (XRD), and energy-dispersive spectroscopy (EDS). The results indicate that variations in detrital composition control the types and genesis of zeolite cements: the zeolite cements in the Fengcheng and Xiazijie formations of the Mahu and Shawan sags were originated from the hydration of volcanic glass in tuff, while the zeolite cements in the Jiamuhe formation of the Zhongguai and Chepaizi bulges from the albitization of plagioclase. These genetic differences resulted in distinct reservoir space: in the Fengcheng and Xiazijie formations of the Mahu and Shawan sags, the evolution of zeolite cements involved changes in cement density and release of crystalline water, facilitating the creation of grain-edge fractures; while in the Jiamuhe formation of the Zhongguai and Chepaizi bulges, the dissolution of laumontite and calcite resulted in reservoir space dominated by dissolution pores.

Key words: Junggar Basin, Mahu sag, Shawan sag, Permian, zeolite cement, reservoir space

中图分类号:

TE122

吕厚宽, 张磊, 安志渊, 况昊, 豆方鹏, 李存, 潘浪. 玛湖凹陷—沙湾凹陷中—下二叠统富火山碎屑砂砾岩储层成因[J]. 新疆石油地质, 2026, 47(1): 20-30.

LYU Houkuan, ZHANG Lei, AN Zhiyuan, KUANG Hao, DOU Fangpeng, LI Cun, PAN Lang. Genesis of Pyroclastic-Rich Sandy Conglomerate Reservoirs in the Lower-Middle Permian of Mahu-Shawan Sags[J]. Xinjiang Petroleum Geology, 2026, 47(1): 20-30.

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