Microcrack Porosity Estimation Based on Rock Physics Templates: A Case Study in Sichuan Basin, China

Chuantong Ruan, Jing Ba, José M. Carcione, Tiansheng Chen and Runfa He
Additional contact information
Chuantong Ruan: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
Jing Ba: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
José M. Carcione: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
Tiansheng Chen: Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
Runfa He: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

Energies, 2021, vol. 14, issue 21, 1-18

Abstract: Low porosity-permeability structures and microcracks, where gas is produced, are the main characteristics of tight sandstone gas reservoirs in the Sichuan Basin, China. In this work, an analysis of amplitude variation with offset (AVO) is performed. Based on the experimental and log data, sensitivity analysis is performed to sort out the rock physics attributes sensitive to microcrack and total porosities. The Biot–Rayleigh poroelasticity theory describes the complexity of the rock and yields the seismic properties, such as Poisson’s ratio and P-wave impedance, which are used to build rock-physics templates calibrated with ultrasonic data at varying effective pressures. The templates are then applied to seismic data of the Xujiahe formation to estimate the total and microcrack porosities, indicating that the results are consistent with actual gas production reports.

Keywords: tight sandstone gas reservoirs; rock-physics template; Biot–Rayleigh theory; total porosity; microcrack porosity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/14/21/7225/pdf (application/pdf)
https://www.mdpi.com/1996-1073/14/21/7225/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:21:p:7225-:d:670715

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().