页岩油储层核磁有效孔隙度起算时间的确定——以吉木萨尔凹陷二叠系芦草沟组页岩油储层为例

doi:10.11743/ogg20190310

Abstract

Abstract: Due to the fine-grained lithology and complex pore throat structure of the Lucaogou shale oil reservoir in Jimusaer sag,Junggar Basin,it is difficult to accurately calculate the effective porosity by conventional logging interpretation methods.To solve this difficulty,30 sandstone samples of five clay types were selected for measurements such as porosity under helium expansion,nuclear magnetic resonance (NMR) T₂ spectrum under different conditions,type and content of clay.The mechanism of clay type effect on short lateral relaxation component of reservoir NMR T₂ signal was revealed through the analysis of matching experimental data.Subsequently,combined with the experimental results and the NMR relaxation time of bound water in various clay types,the effective porosity of shale oil reservoirs in the study area was calculated accurately by iteration method.The initial NMR time was determined to be 1.7 ms,which have been verified well by core analysis and actual logging.The study serves as a new technical solution for effective porosity evaluation of shale oil reservoir.

Key words: NMR logging, clay mineral, effective porosity, shale oil, Lucaogou Formation, Permian, Jimusaer sag, Junggar Basin

CLC Number:

TE121.2

Wang Wei, Zhao Yanwei, Mao Rui, Sun Zhongchun, Mu Liwei. Determination of the starting time for measurement of NMR effective porosity in shale oil reservoir: A case study of the Permian Lucaogou shale oil reservoir,Jimusaer sag[J]. Oil & Gas Geology, 2019, 40(3): 550-557.

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Determination of the starting time for measurement of NMR effective porosity in shale oil reservoir: A case study of the Permian Lucaogou shale oil reservoir,Jimusaer sag

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