Study on oil source of Well X-1 in Haute Mer A Block,Lower Congo Basin

doi:10.3969/j.issn.1672-7703.2017.04.010

Abstract

Abstract: In this paper, detailed analysis was made on 3 oil samples from Well X-1 and 14 cutting samples from Wells X-1 and M-1 in the Haute Mer A Block, the Lower Congo Basin. The results show that the composite biomarker characteristics of oil produced from Well X-1 are obviously different from that of typical lacustrine source rocks in the South Atlantic. The crude oil (1982.1-1989.2 m) of Well X-1 presents the characteristics of marine source rocks with low Pr/Ph (0.97), Pr/nC₁₇ of 0.85, Ph/nC₁₈ of 0.96, C₂₆/C₂₅ tricyclic terpane less than 1.0 and low C₃₀ tetracyclic polyisoprene paraffin hydrocarbon/C₂₇ diasteranes (0.55). Its oleanane abundance is high, indicating that the oil was originated from the source rocks of Upper Cretaceous or above. Oil-source correlation indicates that the oil is genetically related to the source rocks of Upper Cretaceous-Eocene Madingo Formation. The basin modeling further proves that the Miocene Paloukou Formation source rocks are locally matured with limited hydrocarbon supplying capacity, while the Madingo Formation source rocks are currently during the peak stage of hydrocarbon generation and expulsion. The depocenter is during high-over mature stage. Well X-1 is close to the hydrocarbon generating sag of Madingo Formation, where conditions are favorable for oil and gas accumulation. Therefore, it is inferred that the source rocks of Madingo Formation serve as the major contributor to the oil of Well X-1.

Key words: Lower Congo Basin, Haute Mer A Block, lacustrine source rock, marine source rock, oleanane index, oil source correlation

CLC Number:

TE125.5

Lin Qing, Hao Jianrong, Wang Jianxin. Study on oil source of Well X-1 in Haute Mer A Block,Lower Congo Basin[J]. China Petroleum Exploration, 2017, 22(4): 98-107.

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