scholarly journals Estimation of Seismic Wave Attenuation from 3D Seismic Data: A Case Study of OBC Data Acquired in an Offshore Oilfield

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 534
Author(s):  
Fateh Bouchaala ◽  
Mohammed Y. Ali ◽  
Jun Matsushima ◽  
Youcef Bouzidi ◽  
Mohammed S. Jouini ◽  
...  
Keyword(s):  
United Arab Emirates ◽  
Seismic Wave ◽  
Oil Recovery ◽  
Seismic Data ◽  
Carbonate Rocks ◽  
Wave Attenuation ◽  
3D Seismic ◽  
Seismic Wave Attenuation ◽  
Vsp Data ◽  
3D Seismic Data

Previous studies performed in Abu Dhabi oilfields, United Arab Emirates, revealed the direct link of seismic wave attenuation to petrophysical properties of rocks. However, all those studies were based on zero offset VSP data, which limits the attenuation estimation at one location only. This is due to the difficulty of estimating attenuation from 3D seismic data, especially in carbonate rocks. To overcome this difficulty, we developed a workflow based on the centroid frequency shift method and Gabor transform which is optimized by using VSP data. The workflow was applied on 3D Ocean Bottom Cable seismic data. Distinct attenuation anomalies were observed in highly heterogeneous and saturated zones, such as the reservoirs and aquifers. Scattering shows significant contribution in attenuation anomalies, which is unusual in sandstones. This is due to the complex texture and heterogeneous nature of carbonate rocks. Furthermore, attenuation mechanisms such as frictional relative movement between fluids and solid grains, are most likely other important causes of attenuation anomalies. The slight lateral variation of attenuation reflects the lateral homogeneous stratigraphy of the oilfield. The results demonstrate the potential of seismic wave attenuation for delineating heterogeneous zones with high fluid content, which can substantially help for enhancing oil recovery.

New Workflow for Estimating Seismic Wave Attenuation from 3D Surface Seismic Data

2019 ◽  
Author(s):  
F. Bouchaala ◽  
M.Y. Ali ◽  
J. Matsushima ◽  
Y. Bouzidi ◽  
E.M. Takam Takougang ◽  
...  
Keyword(s):  
Seismic Wave ◽  
Seismic Data ◽  
Wave Attenuation ◽  
Seismic Wave Attenuation ◽  
3D Surface

Azimuthal investigation of compressional seismic-wave attenuation in a fractured reservoir

Geophysics ◽  
2019 ◽  
Vol 84 (6) ◽  
pp. B437-B446 ◽  
Author(s):  
Fateh Bouchaala ◽  
Mohammed Y. Ali ◽  
Jun Matsushima ◽  
Youcef Bouzidi ◽  
Eric M. Takam Takougang ◽  
...  
Keyword(s):  
United Arab Emirates ◽  
Seismic Wave ◽  
Wave Attenuation ◽  
Three Dimensional ◽  
Fractured Reservoir ◽  
Flow Mechanism ◽  
Seismic Wave Attenuation ◽  
Seismic Profiling ◽  
Vertical Seismic Profiling ◽  
The Rose

Three-dimensional vertical seismic profiling data acquired from an oilfield located in Abu Dhabi, United Arab Emirates, were used to obtain a high-resolution multioffset azimuthal estimate of compressional seismic wave attenuation. On the basis of the assumption that the fracture strike corresponds to the azimuthal direction [Formula: see text] at which the attenuation is minimized, fracture orientations were obtained in three reservoir units. Two approaches were used to determine [Formula: see text]: first from the variation of the absolute attenuation [Formula: see text] with the azimuth and second from the variation of the relative attenuation [Formula: see text] with the azimuth. The rose diagrams of [Formula: see text] estimated from the [Formula: see text] variation indicated better agreement with those showing the strikes of open and cemented fractures obtained from core interpretation than with either of those showing the two types of fractures separately. However, the rose diagrams of [Formula: see text] estimated from the variation of [Formula: see text] were more similar to those showing the strikes of open fractures obtained from core and Fullbore Formation Microimager data. This observation can be explained by the fact that in the first approach, all types of fractures contribute to the scattering and fluid-related mechanisms of [Formula: see text]. However, in the second approach, [Formula: see text] is obtained from a least-squares fitting of the variation of [Formula: see text] with the azimuth, which is based on the squirt flow mechanism that is caused by the movement of fluid between grain pores and fractures. Therefore, a comparison of the orientations obtained using these two approaches can be an efficient way to separately determine the orientations of open and cemented fractures.

Experimental evidence for the Biot‐Gardner theory

Geophysics ◽  
1989 ◽  
Vol 54 (4) ◽  
pp. 524-527 ◽  
Author(s):  
R. Mörig ◽  
H. Burkhardt
Keyword(s):  
Experimental Evidence ◽  
Seismic Wave ◽  
Seismic Data ◽  
Seismic Waves ◽  
Wave Attenuation ◽  
Wide Spectrum ◽  
Seismic Energy ◽  
Porous Rocks ◽  
Saturation State ◽  
Seismic Wave Attenuation

Seismic wave attenuation has been a subject of interest during the last 40 years because it may be of use in interpreting seismic data. From this attenuation parameter, more detailed information about the lithology of the subsurface may be deduced if we understand the absorption mechanisms by which dissipation of seismic energy is governed. We are, therefore, studying in the laboratory the effects of different parameters such as porosity, permeability, pore fluid, and saturation state on the absorption of seismic waves in porous rocks over a wide spectrum ranging from seismic to ultrasonic frequencies (Burkhardt et al., 1986).

THE SAWPIT STRUCTURE—EVALUATION OF A FRACTURED BASEMENT RESERVOIR PLAY IN THE OTWAY BASIN

1995 ◽  
Vol 35 (1) ◽  
pp. 558
Author(s):  
N.J. Moriarty ◽  
R.J. Taylor ◽  
G.J. Daneel
Keyword(s):  
Structural Analysis ◽  
Oil Recovery ◽  
Seismic Data ◽  
Vertical Displacement ◽  
Horizontal Stress ◽  
Minor Amount ◽  
3D Seismic ◽  
Data Set ◽  
Structure Evaluation ◽  
3D Seismic Data

The 1992 exploration well Sawpit-1, drilled in the Penola Trough of the western Otway Basin, recovered a minor amount of oil (1.5 BBL) from fractured basement. This oil recovery, the first in the basin from rocks older than the Eumeralla Formation, has opened up a new oil play. Fractured basement reservoirs, which can be prolific producers, require prediction of fracture orientation and intensity to be appraised and developed successfully. Such information was sought from a detailed structural analysis of fault attributes (including dip, vertical displacement and heave) using 3D seismic data acquired over the structure in 1993.This 3D seismic data set, acquired at twice the group interval and less than one-quarter the fold of 2D data in the area, has provided the best imaging to date of the complex rifting events of the Sawpit region. Structural analysis of fault attributes indicates an initial south-southwest direction of extension in the Late Jurassic/Early Cretaceous for the Penola Trough, rather than oblique extension as suggested by some authors. This south-southwest extension orientation favours the formation of moderate to high angle fractures trending west-northwest to northwest. Present day minimum horizontal stress is favourably oriented approximately northeast-southwest for these fractures to be open. Interpretation of the 3D seismic data indicates Sawpit-1 probably intersected northeast trending fractures that are oriented perpendicular to the maximum horizontal compressive stress direction and therefore likely to be closed.A deviated well drilled from the northeast would be optimally oriented to intersect northwest trending basement fractures and test a play that has significant oil potential.

scholarly journals Geological structure of the Khylly field according to 3D seismic data

2020 ◽  
Vol 59 (3) ◽  
pp. 52-61
Author(s):  
Tofik Rashid ogly AKHMEDOV ◽  
◽  
Aigyun Nemat kyzy SULTANOVA ◽  
Keyword(s):  
Seismic Data ◽  
Oil And Gas ◽  
Velocity Model ◽  
Geological Structure ◽  
Seismic Survey ◽  
Main Task ◽  
Velocity Analysis ◽  
3D Seismic ◽  
Vsp Data ◽  
3D Seismic Data

Relevance of the work. The paper considers challenging problems related with outlining of intervals with oil and gas presence in the mature Khylly field by use of latest 3D seismic survey techniques in order to gain larger crude resources base. The purpose of this research is to discover the most promising intervals of target horizons with relatively high reservoir properties outlined by 3D seismic data. The subjects of research are 3D seismic survey data, downhole seismic survey – Vertical Seismic Profiling (VSP) and well logging diagrams. The object of research is the Khylly deposit. The paper describes in brief geological and geophysical characteristics, stratigraphic and lithological features of rocks making the section. It is noted that despite repeated surveys by use of various geological and geophysical techniques, the field setting is not thoroughly studied and it has been covered by 3D seismic survey in 2012. Research results. 3D seismic survey applied across Khylly area is resulted in drawing of 4 structural maps for III and I horizons of Productive Series (PS), Akchagyl and Lower Absheron suites. Taking into account the relevance of structural planes of various stratigraphic levels and III horizon of PS being one of the major reference horizons the paper gives description of structural map drawn for this horizon. The detailed velocity model is designed based on VSP data with wide use of velocity analysis data. It has been made clear that Khylly area has block structure and each block has been described in detail. Based on acquired data it has been recommended to drill exploratory well R-1. Conclusion. Processing and interpretation of seismic data are aimed at solving some geological problems; the main task was to obtain results that ensure the study of the geological structure in the seismic survey area, including tracing of seismic horizons, faults and outlining the areas and section intervals which may be of interest due to possible oil and gas presence. VSP data acquired in well 2012 and velocity analysis made it possible to design velocity model of the section under the study, with the use of which the temporary 3D cube was transformed into a depth cube. The quality of seismic data is good and made it possible to solve the tasks set for this research.

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