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地学领域高质量科技期刊分级T2区（2023）

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Volume 42 Issue 1
Jan.  2023
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Article Navigation >  Bulletin of Geological Science and Technology  > 2023  >  42(1): 420-428
Luo Yuhu, Zhang Hengrong, Tang Di, Wu Yixiong, Yuan Wei. Application of NMR logging while drilling in fluid identification of low resistivity reservoirs in Wenchang Oilfield, South China Sea[J]. Bulletin of Geological Science and Technology, 2023, 42(1): 420-428. doi: 10.19509/j.cnki.dzkq.2022.0227
Citation: Luo Yuhu, Zhang Hengrong, Tang Di, Wu Yixiong, Yuan Wei. Application of NMR logging while drilling in fluid identification of low resistivity reservoirs in Wenchang Oilfield, South China Sea[J]. Bulletin of Geological Science and Technology, 2023, 42(1): 420-428. doi: 10.19509/j.cnki.dzkq.2022.0227
shu

Application of NMR logging while drilling in fluid identification of low resistivity reservoirs in Wenchang Oilfield, South China Sea

doi: 10.19509/j.cnki.dzkq.2022.0227

  • Hainan Branch of CNOOC Ltd., Haikou 570311, China

  • Received Date: 21 Jul 2021
    Abstract

  • In the development of low resistivity reservoirs in Wenchang Oilfield of South China Sea, NMR logging while drilling provides porosity, permeability and other parameters in a safe and efficient logging way, and plays a key role in qualitative identification of light oil. In order to further improve the application value of NMR logging while drilling in fluid identification of low resistivity reservoir in Wenchang Oilfield, starting from two influencing factors which is pore structure and fluid properties, T2 spectrum oil-bearing characteristic index was proposed, and pure water spectrum reconstruction was introduced to carry out fluid quantitative identification. The T2 spectrum oil-bearing characteristics index method was based on eliminating the influence of pore structure, and by using the transverse relaxation time difference between light oil and water to extract the real tail phenomenon of light oil, so as to achieve the purpose of quantitative identification of fluid.The water spectrum reconstruction method used the spherical tube model and the normal distribution model to construct the bound water spectrum and the movable water spectrum respectively, which the sum of the two spectrum is pure water spectrum. The information of fluid properties is extracted by comparing with the actual measured NMR T2 spectrum, so as to identify the fluid properties. The two methods have good applications to the fluid identification of low resistivity reservoirs in Wenchang Oilfield.These two methods can play important roles in the quantitative identification of reservoir fluids such as low resistivity reservoirs and water flooded reservoirs.

     

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