Exploration of the Genetic Mechanism of Oil-Water Coexistence in Oil Reservoirs in the North-Central Area of Lixian Slope in Jizhong Depression

doi:10.3969/j.issn.1006-6535.2021.04.008

Abstract

Abstract: In order to explore the genetic mechanism and oil-water distribution characteristics of oil reservoirs in the north-central Lixian slope in Jizhong Depression, critical moments of the petroleum system, sealed coring analysis, and logging data were systematically analyzed. The results showed that the oil-water coexistence in the Lixian slope reservoir was related to the charging degree of the reservoir and the microscopic pore structure of the reservoir; due to low thermal evolution of source rock in the study area, the poor physical properties and high viscosity of crude oil, late hydrocarbon generation and expulsion, and low tectonic amplitude, it was required to overcome additional flow resistance when the oil and gas floated through a longer migration path, resulting in oil and gas charging in the trap; in addition, the pores of the reservoir were not uniformly sorted and the micro-heterogeneity was more serious, resulting in insufficient and uneven oil and gas charging, high natural water saturation in the reservoir, and oil-water coexistence after conventional oil testing or reservoir fracturing stimulation. The study results can become great reference and guidance for further oil exploration and rolling evaluation in the study area.

Key words: oil-water distribution, genetic mechanism, Lixian slope, Jizhong Depression

CLC Number:

TE122.1

Ye Dashuai, Ding Wenlong, Tang Xiaoqi, Hu Yanxu, Zhang Yujing, Du Jin, Wu Yuewei, He Yanchen. Exploration of the Genetic Mechanism of Oil-Water Coexistence in Oil Reservoirs in the North-Central Area of Lixian Slope in Jizhong Depression[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 55-61.

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