Evaluation method of reservoir oil-bearing property by NMR logging of Permian
Lower Wuerhe Formation in Mahu Sag, Junggar Basin

doi:10.3969/j.issn.1672-7703.2021.04.013

Abstract

Abstract: The conglomerate reservoir of Permian Lower Wuerhe Formation in Mahu Sag is characterized by low porosity and low permeability, as well as the complex pore structure. As a result, oil-bearing property evaluation is challenging by using the resistivity logging. Since the reservoir physical property and oil-bearing property are controlled by diagenesis and sedimentation, the reservoir is classifi ed into four types based on porosity and clay content. The saturated waterT₂spectrum and mercury injection experiment results are used to establish the relationship between capillary pressure and T₂ relaxation time of large and small pores for different types of reservoirs, so as to construct the fitting saturated water T₂ spectrum. By comparing the constructed saturated water T₂ spectrum with the measured NMR logging T₂ spectrum, the apparent oil-bearing porosity and oil-sensitive parameters are extracted to establish chart for fl uid property identifi cation. Finally, oil saturation model is established by using oil sensitive parameters for different types of reservoirs. The results show that the relative error is only 8.65% between calculated oil saturation and lab tested oil saturation from sealed core samples, which meet the requirement of highprecision logging interpretation.

CLC Number:

P631.823

Mao Rui, Shen Ziming, Chang Qiusheng, Mou Liwei. Evaluation method of reservoir oil-bearing property by NMR logging of Permian Lower Wuerhe Formation in Mahu Sag, Junggar Basin[J]. China Petroleum Exploration, 2021, 26(4): 162-172.

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Evaluation method of reservoir oil-bearing property by NMR logging of Permian Lower Wuerhe Formation in Mahu Sag, Junggar Basin

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