A Rock Physics Modeling Method for Shale Oil Reservoirs Based on Petrophysical Experiments
Abstract
Given the importance of that shale oil reservoir as hydrocarbon source rocks and unconventional oil resources, which complex mineral types, abundant organic matter, and a mass of micro-nano pores lead to unclear seismic elastic response and difficult "Sweet" identification, it is imperative that study of the physical properties of shale is developed. While petrophysical modeling methods for simulating shale are constantly proposed[1-2], whether the petrophysical modeling methods with their own characteristics can successfully solve the practical industrial production is still a hot issue to be explored.
This study is based on the experimental measurement of rock physical broadband frequency bands (1-3000Hz,1MHz), including elastic modulus and ultrasonic velocity of the shale. On the one hand, elastic response, anisotropy and dispersion characteristics of shale are analyzed to provide support for the subsequent rock physics modeling. On the other hand, the elastic properties of shale are simulated by different methods of dry rock skeleton modeling and fluid replacement with the minerals, organic matter and multiple pores as inputs. A modeling scheme is finally optimized by comparing with the experimental measurement. Finally, the model is applied to make up for the deficiency of some logging data and improve the accuracy of the final logging interpretation. The results show that the combination of self-consistent (SCA) theory and fluid replacement model with frequency considerations is more suitable for the petrophysical modeling of shale oil reservoirs in this region with brittle minerals, clay minerals, organic matter and pores with different aspect ratios as inputs. This method is applied to the simulation of real well, and it is in good agreement with the logging results, which verifies the effectiveness of the modeling method. Reference [1] Guo, Z., X. Li, C. Liu, X. Feng, and Y. Shen, 2013, A shale rock physics model for analysis of brittleness index, mineralogy, and porosity in the Barnett Shale: Journal of Geophysics and Engineering, 10, 025006- 025011. [2] Zhao, L., X. Qin, D. Han, J. Geng, Z. Yang, H. Cao, 2016, Rock-Physics modeling for the elastic properties of organic shale at different maturity stages, Geophysics, 81(5), D527-D541.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMMR0200003X
- Keywords:
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- 3909 Elasticity and anelasticity;
- MINERAL PHYSICS;
- 5102 Acoustic properties;
- PHYSICAL PROPERTIES OF ROCKS;
- 5104 Fracture and flow;
- PHYSICAL PROPERTIES OF ROCKS;
- 5144 Wave attenuation;
- PHYSICAL PROPERTIES OF ROCKS