Analysis of Influence Factors for Shale Oil Contents in 4th Member of Shahejie Formation in Damintun Sag

Abstract

Abstract: As the 4th Member of Shahejie Formation(E₂s₄) shale in Damintun sag has got breakthrough in shale oil, this region has become the study hotspotfor shale oil.To analyze the influence factors for shale oil contents in E₂s₄ in Damintun sag is helpful forexploring accumulation conditions and distribution regularity of shale oil. On the base of core experiments, we analyzed geochemical, reservoir and oil content characteristics of E₂s₄ shale. By characterizing the ancient environment using trace elements, we proposed that the “warm and moist-occlusivelacustrine transgressive” ancient environment model was important condition forforming organic-rich shalein E₂s₄. Warm and moistclimate, occlusive deposit environment and rising water level promoted organic matter generation, accumulation preservation, respectively. By utilizing Rock-Eval method, we got shale oil contents. The results show that E2s4 shalehas high oil contents (0.08%-0.99%, average 0.43%). According to our studies, shale oil contents are influenced by hydrocarbon generation condition, reservoir condition and preservation condition. High organic matter abundance, appropriate high maturity, high brittleness mineral content, high quality of roof and floor, and formation overpressure are favorable conditions for shale oil enrichment and high oil contents.

Chen Kang, Zhang Jinchuan, Tang Xuan, Huang Xiao. Analysis of Influence Factors for Shale Oil Contents in 4th Member of Shahejie Formation in Damintun Sag[J]. China Petroleum Exploration, 2015, 20(6): 22-28.

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