| Author's Name: CAO Zhifeng, LIN Jingqi, ZHENG Yihua, GAN Renzhong, WU Wei,
WANG Xianhu, CHEN Jing, SHAO Guanghui |
| Institution: |
| Abstract: |
| It is very important for oil and gas field exploration and development to accurately obtain reservoir
permeability. SDR model and Coates model based on NMR are the most accurate classical models for reservoir
permeability calculation at present. The classical SDR model and Coates model have achieved very good results in actual
production, but have poor application effect in overpressure reservoir, and there is a large error between calculated
permeability and core analysis permeability.Overpressure conglomerate reservoir has the abnormal characteristics of low
porosity and high permeability, and the classical model of permeability calculation by NMR logging can not calculate the
reservoir permeability. By analyzing the characteristics of overpressure reservoir and the influencing mechanism on
physical properties, it is clear that overpressure intensity is the main controlling factor of permeability. A new method of
constructing NMR permeability processing model of overpressure conglomerate reservoir by introducing overpressure
physical property index and pore structure index based on SDR model is proposed. Taking the Permian Upper Wuerhe
Formation in Mahu sag of Junggar Basin as an example, the petrophysical joint test of overpressured conglomerate
reservoir is carried out to simulate overpressure. The effects of overpressure on porosity, permeability and resistivity of
reservoir is studied, and the SDR overpressure permeability calculation model of overpressure conglomerate reservoir is
established. Compared with core analysis data, the new model has achieved good results in reservoir permeability
calculation. |
| Keywords: nuclear magnetic resonance (NMR); permeability model; overpressure reservoir; conglomerate; Upper
Wuerhe Formation; Mahu sag; Junggar Basin |
|
投稿时间：
2022-07-15 |
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