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Academic Journal of Environment & Earth Science, 2023, 5(10); doi: 10.25236/AJEE.2023.051008.

Study on interpretation method of remaining oil saturation based on PSSL logging


Cao Hao1,2

Corresponding Author:
Cao Hao

1School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, China

2Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi’an Shiyou University, Xi’an, China


Due to the dispersion of residual oil caused by long-term water injection development in oilfields, in order to improve remaining oil recovery, it is necessary to find out the distribution of oil and water and determine the remaining oil enrichment area. In this paper, the logging interpretation principle of Pulsed Neutron Full-Spectra Saturation Logging (PSSL) instrument is introduced. Then, the main formation factors affecting PSSL logging are analyzed, and in the C/O measurement model, a new interpretation model is proposed that uses C/O and Si/Ca to calculate the oil and water lines, and subsequently utilizes the difference between the measured C/O and the oil and water lines to explain the water flooding. By establishing the cross plot of the difference between the measured C/O and the oil and water lines, the influence of lithology and petrophysical properties on the measured value can be reduced to a certain extent, and the flooded layer can be accurately and quickly identified. This method provides technical guarantee for determining the distribution of oil and water in the oilfield, evaluating the level of flooding, and taking measures to block water and re-perforation.


PSSL; Carbon-to-oxygen ratio; Remaining oil saturation; Identification of water flooded layers

Cite This Paper

Cao Hao. Study on interpretation method of remaining oil saturation based on PSSL logging. Academic Journal of Environment & Earth Science (2023) Vol. 5 Issue 10: 55-62. https://doi.org/10.25236/AJEE.2023.051008.


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