Metamorphic Buried Hill Reservoir of Bozhong 19–6 Gas Field: The Characteristics of Hydrothermal Fracture Fillings and Their Geological Significance of Petroleum

doi:10.11885/j.issn.1674-5086.2023.04.17.05

Abstract

Abstract: The Bozhong 19–6 Gas Field within metamorphic buried hills is a giant one discovered in 2018. The fractures developed in the metamorphic rock buried hill reservoir system are the main seepage channels and storage spaces for oil and gas, and the fracture fillings record the fluid action and evolution process of the reservoir. Therefore, systematic research on fracture fillings is of great significance for oil and gas exploration and development. Based on systematic observation of cores and the casting thin sections from metamorphic buried hill reservoir, we illustrate the geochemical characteristics of the hydrothermal fluid activity and petroleum migration happening to the reservoir and the hydrothermal influence on the reservoir using electron microprobe analysis, LA-ICPMS, cathodoluminescence and fluorometric analysis. The results show that: 1) hydrothermal minerals in fractures include three types of aessemblages which are magnesian siderite+ankerite+quartz, magnesian siderite+quartz, ankerite + quartz. 2) the in-situ geochemical characteristics of magnesian siderite and ankerite indicate the genesis of contemporaneous hydrothermal fluids. 3) hydrocarbons are usually occurred as fixed bitumen hosted in ankerite and inclusions hosted in magnesian siderite. The hydrothermal activity and petroleum migration likely took place at the same time and they were the two contemporaneous geological events. 4) more than the corrosion effect that the hydrothermal fluid took, hydrothermal fluid closing the fractures had damaged the physical property of the reservoir.

Key words: Bohai Bay Basin, Bozhong 19–6 Gas Field, metamorphic buried hill, fracture fillings, hydrothermal minerals

CLC Number:

TE122
P595

ZHOU Yi, GUO Yujie, LUO Yuhang, WANG Yansong, TANG Hongming. Metamorphic Buried Hill Reservoir of Bozhong 19–6 Gas Field: The Characteristics of Hydrothermal Fracture Fillings and Their Geological Significance of Petroleum[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(5): 80-96.

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