Depositional impact on the elastic characteristics of the organic shale reservoir and its seismic application: A case study of the Longmaxi-Wufeng Shale in the Fuling gas field, Sichuan Basin

Zhao, Luanxiao1; Wang, Yang2; Liu, Xiwu3,4; Zhang, Jinqiang3,4; Liu, Yuwei3,4; Qin, Xuan5; Li, Kelan1; Geng, Jianhua1

2020-03-01

10.1190/GEO2019-0326.1

GEOPHYSICS   影响因子和分区

0016-8033

1942-2156

Seismic characterization of the depositional evolution history of the organic shale reservoir is essential for reservoir quality evaluation and geologic model building in unconventional plays. However, a direct link between the depositional environment and seismic elastic responses in organic-rich shales remains unclear. By combining the depositional history and rock-physics analysis, we have determined how the depositional environment affects the elastic characteristics of the Longmaxi-Wufeng Shale in the Fuling gas field, Sichuan Basin, Southwestern China. Sedimentological control on the elastic properties mainly lies in two aspects: First, the distinct elastic features of the overlying turbidity mudstone and the underlying deepwater shelf Longmaxi Formation are primarily caused by the rock structure difference due to water energy; second, within the deepwater shelf siliceous shale formation, the elastic property variations are primarily controlled by the progradation tract system and water depths. We evaluate the effect of two types of quartz (biogenic quartz and detrital quartz) in conjunction with organic matter on the elasticity of organic shale. Furthermore, we determine that the two most commonly used seismic inversion attributes, P-impedances and the V-P/V-S ratio, can be used to indicate the depositional facies evolution. This also gives insights into using geophysical attributes to directly characterize depositional facies for unconventional shale reservoirs.

SCI ; EI

英语

其他

Young Elite Scientists Sponsorship Program by CAST[2017QNRC001]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000519538200037

SOC EXPLORATION GEOPHYSICISTS

20203409066876

Gas industry ; Deposition ; Quality control ; Seismology ; Shale ; Elasticity

Minerals:482.2 ; Earthquake Measurements and Analysis:484.1 ; Gas Fuels:522 ; Chemical Operations:802.3 ; Quality Assurance and Control:913.3

GEOSCIENCES

Web of Science

1.Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China
2.Univ Houston, Dept Earth & Atmospher Sci, Houston, TX USA
3.State Key Lab Shale Oil & Gas Enrichment Mech & E, Beijing, Peoples R China
4.SINOPEC Petr Explorat & Prod Res Inst, Beijing, Peoples R China
5.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China

Zhao, Luanxiao,Wang, Yang,Liu, Xiwu,et al. Depositional impact on the elastic characteristics of the organic shale reservoir and its seismic application: A case study of the Longmaxi-Wufeng Shale in the Fuling gas field, Sichuan Basin[J]. GEOPHYSICS,2020,85(2):B23-B33.

Zhao, Luanxiao.,Wang, Yang.,Liu, Xiwu.,Zhang, Jinqiang.,Liu, Yuwei.,...&Geng, Jianhua.(2020).Depositional impact on the elastic characteristics of the organic shale reservoir and its seismic application: A case study of the Longmaxi-Wufeng Shale in the Fuling gas field, Sichuan Basin.GEOPHYSICS,85(2),B23-B33.

Zhao, Luanxiao,et al."Depositional impact on the elastic characteristics of the organic shale reservoir and its seismic application: A case study of the Longmaxi-Wufeng Shale in the Fuling gas field, Sichuan Basin".GEOPHYSICS 85.2(2020):B23-B33.