Accumulation Conditions of CO2 and Its Influence to Pre-salt Oilfields, Santos Basin

doi:10.11885/j.issn.1674-5086.2018.12.04.01

Abstract

Abstract: In recent years, the pre-salt sequence of Santos Basin is the focused exploration area, but CO₂ is generally found in the pre-salt oil fields. After analysis of CO₂ content, carbon isotope and helium isotope, the generation type of CO₂ in Santos basin pre-salt layers is inorganic mantel. Based on generation type and the comprehensive analysis of the correlation of CO₂ content with basement faults distribution, we found that fields closed to faults are generally high in CO₂ content. Meanwhile, the analysis of generation factors and accumulation elements of CO₂ in the typical fields displays that volcano activities and basement faults are the controlling factors for the accumulated CO₂ gas cap. And the volcano provides CO₂ source, faults acting as migration pathways. Affected by a large amount of inflow of continuous CO₂, evaporation and diffluence occurred in oil and gas composition and generated gas cap of high CO₂ content.

Key words: Santos Basin, pre-salt, CO₂, oil and gas accumulation, Brazil

CLC Number:

TE121

JIA Huaicun, KANG Hongquan, LI Minggang, CHENG Tao, HOU Bo. Accumulation Conditions of CO₂ and Its Influence to Pre-salt Oilfields, Santos Basin[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 66-72.

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Accumulation Conditions of CO₂ and Its Influence to Pre-salt Oilfields, Santos Basin

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