Common-depth-point seismic-reflection survey on the Mississippi River in the vicinity of Alton, Illinois

1984 ◽  
Author(s):  
G.B. Tirey ◽  
R.A. Wise ◽  
E.A. Winget
Keyword(s):  
Mississippi River ◽  
Seismic Reflection ◽  
Common Depth Point

Near‐surface faulting effects on seismic reflection times

Geophysics ◽  
1983 ◽  
Vol 48 (8) ◽  
pp. 1140-1142 ◽  
Author(s):  
W. Honeyman
Keyword(s):  
Seismic Reflection ◽  
Small Time ◽  
Time Curve ◽  
Near Surface ◽  
Common Depth Point ◽  
Offset Distance ◽  
Large Spread ◽  
Offset Time ◽  
Seismic Sections ◽  
Zero Offset

The depth conversion of seismic reflection records has been the subject of many papers, particularly where faults or other geologic features are present. The common‐depth‐point (CDP) stacked seismic sections with large spread lengths of the order of 2 km have resulted in different interpretation problems. Al‐Chalabi (1979) considered the effect on stacking velocities of subsurface inhomogeneities where different rays in the CDP gather do not penetrate the same type of earth column. He showed that small time delays of 10 msec produce steps in the hyperbolic offset distance‐time curve of the CDP gather and produce stacking velocity variations of the order of ten percent. Levin (1973) considered a time delay in only one ray of the CDP gather and its effect on both stacking velocity and the zero‐offset time [Formula: see text]. This paper models the effect of near‐surface faults on the zero‐offset time [Formula: see text] of deeper layers as determined by the CDP method. This is particularly important since the zero‐offset time is plotted on the processed final record.

scholarly journals Seismic Reflection Survey at Locks and Dams 20, 22, and 24, Upper Mississippi River.

1996 ◽  
Author(s):  
Keith J. Sjostrom ◽  
Rodney L. Leist
Keyword(s):  
Mississippi River ◽  
Seismic Reflection ◽  
Upper Mississippi River

Using Areal Common Depth-Point (CMP) Seismic Reflection Method for Additional Exploration of the Coal Field

2020 ◽  
Author(s):  
A.M. Turchkov ◽  
A.N Oshkin ◽  
I.P. Korotkov ◽  
E.A. Keldyushova ◽  
A.A. Vyaznikovcev
Keyword(s):  
Seismic Reflection ◽  
Reflection Method ◽  
Coal Field ◽  
Common Depth Point ◽  
Seismic Reflection Method

Three‐dimensional seismic monitoring of an enhanced oil recovery process

Geophysics ◽  
1987 ◽  
Vol 52 (9) ◽  
pp. 1175-1187 ◽  
Author(s):  
Robert J. Greaves ◽  
Terrance J. Fulp
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Seismic Data ◽  
Seismic Reflection ◽  
Three Dimensional ◽  
Recovery Process ◽  
Bright Spot ◽  
Seismic Reflection Data ◽  
Reflection Data ◽  
Common Depth Point

Seismic reflection data were used to monitor the progress of an in‐situ combustion, enhanced oil recovery process. Three sets of three‐dimensional (3-D) data were collected during a one‐year period in order to map the extent and directions of propagation in time. Acquisition and processing parameters were identical for each survey so that direct one‐to‐one comparison of traces could be made. Seismic attributes were calculated for each common‐depth‐point data set, and in a unique application of seismic reflection data, the preburn attributes were subtracted from the midburn and postburn attributes. The resulting “difference volumes” of 3-D seismic data showed anomalies which were the basis for the interpretation shown in this case study. Profiles and horizon slices from the data sets clearly show the initiation and development of a bright spot in the reflection from the top of the reservoir and a dim spot in the reflection from a limestone below it. Interpretation of these anomalies is supported by information from postburn coring. The bright spot was caused by increased gas saturation along the top‐of‐reservoir boundary. From postburn core data, a map of burn volume distribution was made. In comparison, the bright spot covered a greater area, and it was concluded that combustion and injection gases had propagated ahead of the actual combustion zone. The dim spot anomaly shows good correlation with the burn volume in distribution and direction. Evidence from postburn logs supports the conclusion that the burn substantially decreased seismic velocity and increased seismic attenuation in the reservoir. Net burn thicknesses measured in the cores were used to calibrate the dim‐spot amplitude. With this calibration, the dim‐spot amplitude at each common depth point was inverted to net burn thickness and a map of estimated burn thickness was made from the seismic data.

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