玛湖凹陷与沙湾凹陷上乌尔禾组储集层差异及成因

doi:10.7657/XJPG20230103

摘要/Abstract

摘要：

通过薄片观察、扫描电镜分析、黏土矿物X射线衍射分析、阴极发光实验等，对准噶尔盆地玛湖凹陷和沙湾凹陷上二叠统上乌尔禾组成岩差异进行对比分析，明确了成岩产物类型和孔隙演化过程。压实作用、碳酸盐矿物胶结与沸石胶结是研究区储集层物性差异的主要控制因素，玛湖凹陷压实作用相对较弱，沙湾凹陷溶蚀作用更强。砂体成岩孔隙演化具有差异性，玛湖凹陷储集层以长石颗粒和凝灰岩岩屑溶孔为主，沙湾凹陷储集层以长石颗粒、凝灰岩岩屑以及浊沸石溶孔为主，2类储集层都少量发育原生孔隙。以上2个地区储集层的差异性主要是由成岩流体性质和岩石组分不同导致，其中，岩石组分是导致玛湖凹陷和沙湾凹陷砂砾岩储集层孔隙结构特征差异的主要原因。

关键词: 准噶尔盆地, 玛湖凹陷, 沙湾凹陷, 上乌尔禾组, 储集层特征, 差异性成因, 成岩作用, 成岩演化

Abstract:

By means of thin section observation，scanning electron microscope (SEM) analysis，X-ray diffraction (XRD) analysis of clay minerals，and cathodoluminescence experiment，the diagenesis of the Upper Permian upper Wuerhe formation in the Mahu and Shawan sags in the Junggar basin were analyzed and compared，and the types of diagenetic products and pore evolution process were clarified. Compaction，carbonate mineral cementation and zeolite cementation are the main factors controlling the differences in reservoir physical properties in the study area. The compaction in the Mahu sag is relatively weak，while the dissolution in the Shawan sag is relatively strong. There are differences in diagenesis and pore evolution of sand bodies in the two sags. The reservoirs in the Mahu sag are dominated by feldspar particles and dissolved tuff debris pores，and the reservoirs in the Shawan sag are dominated by feldspar particles，dissolved tuff debris pores，and dissolved zeolite pores. There are a few primary pores developed in the reservoirs in both Mahu sag and Shawan sag. The differences between the reservoirs in the two sags are mainly caused by the different properties of diagenetic fluids and rock components. Specifically，the rock components represent the main cause for the differences in pore structure characteristics in the sandy conglomerate reservoirs in the Mahu sag and the Shawan sag.

Key words: Junggar basin, Mahu sag, Shawan sag, upper Wuerhe formation, reservoir characteristic, differential genesis, diagenesis, diagenetic evolution

中图分类号:

TE122

况昊, 周润驰, 王钧民, 刘豪, 谭先锋, 蔡鑫勇, 肖振兴. 玛湖凹陷与沙湾凹陷上乌尔禾组储集层差异及成因[J]. 新疆石油地质, 2023, 44(1): 18-24.

KUANG Hao, ZHOU Runchi, WANG Junmin, LIU Hao, TAN Xianfeng, CAI Xinyong, XIAO Zhenxing. Differences and Genesis of Upper Wuerhe Formation Reservoirs in Mahu Sag and Shawan Sag[J]. Xinjiang Petroleum Geology, 2023, 44(1): 18-24.

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