Research Methods and Applications of Hydrodynamic Field in Huizhou Sag

doi:10.3969/j.issn.1006-6535.2023.02.012

Abstract

Abstract: To address the problem that the distribution law of unconventional tight oil and gas reservoirs in the Huizhou Sag is unclear and the top and bottom boundaries are unknown, which seriously affects the exploration and development process, based on the data of logging, oil production testing and high-pressure Hg injection, the lower limit of buoyant accumulation in the study area is determined by the combination of statistical analysis of reservoir properties and case study method, and the bottom limit of hydrocarbon accumulation is determined by the minimum flowing pore throat radius method and the potential difference method inside and outside the reservoir, and the free and restricted hydrodynamic fields in the Huizhou Sag are divided to find out the distribution boundaries of unconventional oil and gas reservoirs. The research results show that the lower limit of buoyant accumulation in Huizhou Sag is 3 500-4 000 m, the corresponding porosity is 8.50%, and the permeability is 1.00 mD; the critical pore throat radius of the bottom limit of hydrocarbon accumulation is 0.032 5 μm, the critical porosity is from 1.72% to 2.00%, and the corresponding depth bottom limit is 6 000 to 6 500 m. The research results point to the direction for opening up new oil and gas exploration areas in the Huizhou Sag and finding new oil and gas exploration targets and alternative resources.

Key words: lower limit of buoyant accumulation, dense oil and gas, bottom limit of hydrocarbon accumulation, hydrodynamic field, discrimination method, Huizhou Sag

CLC Number:

TE122.1

You Tingting, Pang Xiongqi, Li Hongbo, Yuan Wu, Hu Tao, Yu Sa, Shi Kanyuan, Cai Zhe. Research Methods and Applications of Hydrodynamic Field in Huizhou Sag[J]. Special Oil & Gas Reservoirs, 2023, 30(2): 86-94.

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