Full diameter core 2D NMR characteristics of pore fluid in shale oil reservoir and evaluation method

doi:10.3969/j.issn.1672-7703.2023.03.011

Abstract

Abstract: How to objectively evaluate the pore fluid in shale oil reservoir and accurately measure and quantitatively characterize parameters such as oil saturation and mobile oil content in shale oil and tight oil reservoirs are key technical problems that need to be solved urgently.The vehicle-mounted mobile full diameter core NMR measurement instrument is firstly introduced in domestic to conduct on-site core testing analysis and shale oil evaluation, which supports to realize the continuous, high-precision, non-destructive and rapid NMR scanning of drilled core on well site, make up for the shortcomings of NMR logging and indoor core experiments, and fill the blank of on-site measurement technology of full diameter shale oil core in China. Based on field core description, other supporting experimental data and well testing verification, the characteristics of 2D NMR T₁-T₂ spectrum of various fluid components are systematically summarized, the change rule of T₁/T₂ ratio of oil and water fluid signals in pores with different diameters is identified, and the pore fluid component analysis method and identification standard are established by using 2D NMR spectrum characteristics of full diameter core, which support to realize the accurate identification of pore fluid components and quantitative interpretation of fluid saturation of shale oil, tight oil and complex clastic rock reservoirs. The technology of vehicle-mounted mobile full diameter core NMR measurement has played an important role in the exploration and evaluation of Gulong shale oil in Songliao Basin, Chang 7₃ shale oil in Ordos Basin, as well as in Hetao Basin, and has widely been applied in tight oil and gas oilfields in Daqing, Changqing, Xinan, Huabei, and Xinjiang oilfields, in which good results have been achieved.

CLC Number:

P631.823

Shi Yujiang, Cai Wenyuan, Liu Guoqiang, Yuan Chao, Zhang Wei, Di Shuhua, Li Si, Wang Shaoqing. Full diameter core 2D NMR characteristics of pore fluid in shale oil reservoir and evaluation method[J]. China Petroleum Exploration, 2023, 28(3): 132-144.

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