Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of Symmetry
The rock containing a set of tilted fractures is equivalent to a transversely isotropic (TTI) medium with a tilted axis of symmetry. To implement fluid identification and tilted fracture detection, we propose an inversion approach of utilizing seismic data to simultaneously estimate parameters that...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2020/7026408 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832558433668169728 |
|---|---|
| author | Xinpeng Pan Lin Li Guangzhi Zhang Yian Cui |
| author_facet | Xinpeng Pan Lin Li Guangzhi Zhang Yian Cui |
| author_sort | Xinpeng Pan |
| collection | DOAJ |
| description | The rock containing a set of tilted fractures is equivalent to a transversely isotropic (TTI) medium with a tilted axis of symmetry. To implement fluid identification and tilted fracture detection, we propose an inversion approach of utilizing seismic data to simultaneously estimate parameters that are sensitive to fluids and tilted fractures. We first derive a PP-wave reflection coefficient and elastic impedance (EI) in terms of the dip angle, fluid/porosity term, shear modulus, density, and fracture weaknesses, and we present numerical examples to demonstrate how the PP-wave reflection coefficient and EI vary with the dip angle. Based on the information of dip angle of fractures provided by geologic and well data, we propose a two-step inversion approach of utilizing azimuthal seismic data to estimate unknown parameters involving the fluid/porosity term and fracture weaknesses: (1) the constrained sparse spike inversion (CSSI) for azimuthally anisotropic EI data and (2) the estimation of unknown parameters with the low-frequency constrained regularization term. Synthetic and real data demonstrate that fluid and fracture parameters are reasonably estimated, which may help fluid identification and fracture characterization. |
| format | Article |
| id | doaj-art-1c4064128a914b01a8193f170e820c2b |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-1c4064128a914b01a8193f170e820c2b2025-02-03T01:32:23ZengWileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/70264087026408Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of SymmetryXinpeng Pan0Lin Li1Guangzhi Zhang2Yian Cui3School of Geoscience and Info-Physics, Central South University, Changsha 410082, ChinaSchool of Geoscience, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Geoscience, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Geoscience and Info-Physics, Central South University, Changsha 410082, ChinaThe rock containing a set of tilted fractures is equivalent to a transversely isotropic (TTI) medium with a tilted axis of symmetry. To implement fluid identification and tilted fracture detection, we propose an inversion approach of utilizing seismic data to simultaneously estimate parameters that are sensitive to fluids and tilted fractures. We first derive a PP-wave reflection coefficient and elastic impedance (EI) in terms of the dip angle, fluid/porosity term, shear modulus, density, and fracture weaknesses, and we present numerical examples to demonstrate how the PP-wave reflection coefficient and EI vary with the dip angle. Based on the information of dip angle of fractures provided by geologic and well data, we propose a two-step inversion approach of utilizing azimuthal seismic data to estimate unknown parameters involving the fluid/porosity term and fracture weaknesses: (1) the constrained sparse spike inversion (CSSI) for azimuthally anisotropic EI data and (2) the estimation of unknown parameters with the low-frequency constrained regularization term. Synthetic and real data demonstrate that fluid and fracture parameters are reasonably estimated, which may help fluid identification and fracture characterization.http://dx.doi.org/10.1155/2020/7026408 |
| spellingShingle | Xinpeng Pan Lin Li Guangzhi Zhang Yian Cui Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of Symmetry Geofluids |
| title | Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of Symmetry |
| title_full | Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of Symmetry |
| title_fullStr | Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of Symmetry |
| title_full_unstemmed | Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of Symmetry |
| title_short | Elastic-Impedance-Based Fluid/Porosity Term and Fracture Weaknesses Inversion in Transversely Isotropic Media with a Tilted Axis of Symmetry |
| title_sort | elastic impedance based fluid porosity term and fracture weaknesses inversion in transversely isotropic media with a tilted axis of symmetry |
| url | http://dx.doi.org/10.1155/2020/7026408 |
| work_keys_str_mv | AT xinpengpan elasticimpedancebasedfluidporositytermandfractureweaknessesinversionintransverselyisotropicmediawithatiltedaxisofsymmetry AT linli elasticimpedancebasedfluidporositytermandfractureweaknessesinversionintransverselyisotropicmediawithatiltedaxisofsymmetry AT guangzhizhang elasticimpedancebasedfluidporositytermandfractureweaknessesinversionintransverselyisotropicmediawithatiltedaxisofsymmetry AT yiancui elasticimpedancebasedfluidporositytermandfractureweaknessesinversionintransverselyisotropicmediawithatiltedaxisofsymmetry |