Structural heterogeneity of reservoirs and its implication on hydrocarbon accumulation in deep zones

Abstract

Abstract: Porosity and permeability heterogeneities of reservoirs are common geological phenomena that influence significantly fluid flowing. They are very important not only for oil and gas production but also for oil and gas migration and accumulation researches. In this paper, a kind of special structural heterogeneity was discussed. Owing to the heterogeneities of sedimentary structures in reservoirs, a certain 3D spatial structure is formed by various tight intercalations. Due to the existence of such 3D structures, the flow of fluids in reservoir is impeded, diagenetical heterogeneity is induced during the burial history, and strong heterogeneities are generated in the process of hydrocarbon accumulation and porosity reduction. It is shown from simulation results that this kind of structural heterogeneity can result in strong heterogeneity of migration pathways and accumulation locations. Based on core observation and hydrocarbon reservoir dissection analysis, diagenesis and reservoir formation took place alternatively when Jurassic oil-bearing reservoirs in the central Junggar Basin were buried to the deep zones in the basin. Due to the existence of structural heterogeneity, the high-quality reservoirs can be preserved in the deep zones and it is favorable for the migration and accumulation of oil and gas at the later stage.

Key words: deep zone, sandstone reservoir, structural heterogeneity, sedimentary structure, diagenesis, hydrocarbon migration and accumulation, deep zone, sandstone reservoir, structural heterogeneity, sedimentary structure, diagenesis, hydrocarbon migration and accumulation

Luo Xiaorong, Zhang Likuan, Lei Yuhong, Hu Caizhi, Shi Hui, Cao Binfeng. Structural heterogeneity of reservoirs and its implication on hydrocarbon accumulation in deep zones[J]. China Petroleum Exploration, 2016, 21(1): 28-36.

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