Diagenesis and fluid inclusion records of the oil preservation window in a deep carbonate reservoir

IF 3.1 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2025-02-01 DOI:10.1016/j.apgeochem.2025.106299

Binbin Xi , Zhen Li , Kai Rankenburg , Xian Liu , Noreen Evans , Brent McInnes , Wenxuan Hu , Jian Cao , I-Ming Chou , Xiaolin Wang

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引用次数: 0

Abstract

Determining the maximum temperature or burial depth where liquid hydrocarbon is preserved (i.e., oil preservation window) is a critical scientific problem. However, large discrepancy remains in the documented oil preservation window (e.g., 150–175 °C versus >240 °C), significantly influencing our understanding of the distribution of oil in deep earth. In this study, complete diagenesis and fluid inclusion records of oil charging and cracking were discovered in a Permian carbonate reservoir from the eastern Sichuan Basin (South China). Reconstructions of the diagenesis and petroleum evolution history reveal dynamic temperature-pressure controls on oil stability. Specifically, oil can be cracked to form methane-dominated gas after heating at ≤192 °C (σ = 4) and in a hydrostatic pressure regime for ∼20 m.y. Extreme overpressure formed postdating oil cracking due to intense calcite cementation, which resulted in isolated system and favored generation and accumulation of abnormally high pressure (up to 199 MPa) hydrocarbon fluids. The new oil preservation window can be applied to normal pressure or weak overpressure reservoirs, predicting the distribution of liquid hydrocarbon in deep earth.

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.