Analysis on Original Gas Saturation of Volcanic Gas Reservoir Based on NMR Experiment

doi:10.7657/XJPG20200305

Abstract

Abstract:

In order to analyze the gas saturation of the low-permeability volcanic gas reservoir in X gas field, nuclear magnetic resonance（NMR）experiments were carried out to analyze the gas saturations of 50 pieces of cores from 6 wells in the area. The results show that when the calibrated centrifugal force is 2.760 MPa in the centrifugal experiment and the lower limit of the effective flowing throat radius is 0.053 μm, the calculated movable fluid saturation agrees well with the experimental results and the field production data. When the centrifugal force is higher than 2.760 MPa, the irreducible water saturation of the core changes a little with the increase of the centrifugal force. When the centrifugal force is lower than 2.760 MPa, the movable fluid saturation is approximate to the original gas saturation of the reservoir, and the T₂ value calibrated by the experiment can be considered as the T₂ cutoff of the target reservoir and can be directly used to determine the original gas saturation and the original water saturation of the gas reservoir. The method of NMR T₂ spectrum can be used to accurately evaluate the original gas saturation of the volcanic gas reservoir, which provides theoretical basis and technical support for logging interpretation of gas saturation in similar gas reservoirs.

Key words: NMR, volcanic gas reservoir, gas saturation, full diameter core, centrifugal force, pore throat radius, relaxation time

CLC Number:

TE125.1

ZHANG Mingyu, KONG Chuixian, QI Hongyan, LI Liang, ZHOU Yang, SU Jing, JIANG Qingping. Analysis on Original Gas Saturation of Volcanic Gas Reservoir Based on NMR Experiment[J]. Xinjiang Petroleum Geology, 2020, 41(3): 288-294.

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