1. 河海大学地球科学与工程学院，江苏南京，211000; 2. 中国石油长庆油田分公司勘探开发研究院，陕西西安，7100182; 3. National Institute of Oceanography and Applied Geophysics (OGS), Sgonico, Trieste 34010; 4. 中石化石油物探技术研究院有限公司，江苏南京，211103
Permeability Estimation of Shale Oil Reservoir with Laboratory-derived Data: A Case Study of the Chang 7 Member in Ordos Basin
Zhang Lin, Gao Li, Ba Jing*, Zhang Meng-Bo, José M. Carcione, and Liu Wei-Hua
1. School of Earth Sciences and Engineering, Hohai University, Nanjing, Jiangsu, 211000.
2. Exploration and Development Research Institute of PetroChina, Changqing Oilfi eld Company, Xi'an Shanxi, 710018.
3. National Institute of Oceanography and Applied Geophysics (OGS), Sgonico, Trieste 34010.
4. Sinopec Geophysical Research Institute, Nanjing, Jiangsu, 211103.
Abstract：
The shale oil reservoir within the Yanchang Formations of Ordos Basin harbors substantial oil and gas resources and has recently emerged as the primary focus of unconventional oil and gas exploration and development. Due to its complex pore and throat structure, pronounced heterogeneity, and tight reservoir characteristics, the techniques for conventional oil and gas exploration and production face challenges in comprehensive implementation, also indicating that as a vital parameter for evaluating the physical properties of a reservoir, permeability cannot be effectively estimated. This study selects 21 tight sandstone samples from the Q area within the shale oil formations of Ordos Basin. We systematically conduct the experiments to measure porosity, permeability, ultrasonic wave velocities, and resistivity at varying confi ning pressures. Results reveal that these measurements exhibit nonlinear changes in response to eff ective pressure. By using these experimental data and eff ective medium model, empirical relationships between Pand S-wave velocities, permeability and resistivity and eff ective pressure are established at logging and seismic scales. Furthermore, relationships between P-wave impedance and permeability, and resistivity and permeability are determined. A comparison between the predicted permeability and logging data demonstrates that the impedance–permeability relationship yields better results in contrast to those of resistivity–permeability relationship. These relationships are further applied to the seismic interpretation of shale oil reservoir in the target layer, enabling the permeability profi le predictions based on inverse P-wave impedance. The predicted results are evaluated with actual production data, revealing a better agreement between predicted results and logging data and productivity.
. Permeability Estimation of Shale Oil Reservoir with Laboratory-derived Data: A Case Study of the Chang 7 Member in Ordos Basin[J]. APPLIED GEOPHYSICS, 2024, 21(3): 440-455.
2024, Vol. 21 
