Numerical Simulation on Tilted OWC Controlled by Interlayers in Hade 4CⅢ Reservoir

doi:10.7657/XJPG20220207

Abstract

Abstract:

The Hade 4CⅢreservoir is a marine sandstone reservoir with edge and bottom water, where there is a largely-tilted oil-water contact (OWC) with a height difference of nearly 100 m. The hydrocarbon accumulation mechanism and the origin of the tilted OWC are still controversial. According to the characteristics of beds, fluid and interlayers in the reservoir, a corresponding geological model was established. By adjusting the number, distribution, capillary pressure, and skylights of the interlayers, the process of secondary migration and accumulation of oil and gas in the reservoir was numerically simulated. The number and distribution of the interlayers have a significant impact on the formation of the tilted OWC and on the distribution of oil and water. The higher the capillary pressure of the interlayer, the greater the inclination of the tilted OWC. The longer the extension of the interlayer, the greater the inclination of the tilted OWC. If the number and location of interlayer skylights are different, the oil-water distribution and oil-water contact are also significantly different at the end of the hydrocarbon accumulation period. The great inclination of the tilted OWC in the Hade 4CⅢreservoir is mainly due to the shielding of interlayers and the differentiation of oil-water gravity during the hydrocarbon accumulation, followed by tectonic movement and unsteady hydrocarbon accumulation.

Key words: Hade 4CⅢreservoir, interlayer, tilted oil-water contact, tectonic movement, unsteady hydrocarbon accumulation, cross-sec tional model, capillary pressure, skylight, numerical simulation

CLC Number:

TE122

LIAN Zhanggui, BIAN Wanjiang, HAN Tao, LAO Binbin, WANG Kaiyu, ZENG Jiangtao. Numerical Simulation on Tilted OWC Controlled by Interlayers in Hade 4CⅢ Reservoir[J]. Xinjiang Petroleum Geology, 2022, 43(2): 177-182.

Figures/Tables 8

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