Portable dense geophone array for shallow and very shallow 3D seismic reflection surveying: Part 1—Data acquisition, quality control, and processing

A strategy is presented for 3D seismic reflection imaging of shallow and very shallow targets, utilizing a portable dense geophone array. A dense 2D geophone array identifies faint shallow reflections and suppresses coherent noise. Fixing the receiver locations enables the design of quality control (QC) procedures that improve event identification. The number of shots, shot locations, and their effect on target illumination can be evaluated with various QC tools during acquisition to improve overall data quality. At the same time the portability of the array increases the cost effectiveness. Radially projected supergathers enable the choice of efficient processing parameters. With sufficiently high fold and 3D frequency–wavenumber filtering, the dense geophone array is shown to image reflectors from 8 to 50 ms, along with a dominant 20‐ms water table reflection.

[1]  Don W. Steeples,et al.  Geophones on a board , 1998 .

[2]  Evan K. Franseen,et al.  Vertical Resolution of a Seismic Survey in Stratigraphic Sequences less than 100 m Deep in Southeastern Kansas , 1995 .

[3]  A. Green,et al.  Shallow 3-D seismic reflection surveying: Data acquisition and preliminary processing strategies , 1998 .

[4]  Alan G. Green,et al.  Results of 2- and 3-D high-resolution seismic reflection surveying of surficial sediments , 1996 .

[5]  Tapan Mukerji,et al.  Cost Effective Near Surface 3D Seismic Imaging In Heterogeneous Subsurface Using Portable Geophone Array And a Laptop , 2001 .

[6]  Susan E. Pullan,et al.  Shallow seismic reflection mapping of the overburden-bedrock interface with the engineering seismograph; some simple techniques , 1984 .

[7]  Don W. Steeples,et al.  Avoiding pitfalls in shallow seismic reflection surveys , 1998 .

[8]  Amos Nur,et al.  High‐resolution shallow‐seismic experiments in sand, Part II: Velocities in shallow unconsolidated sand , 1998 .

[9]  Alan G. Green,et al.  A workshop examination of shallow seismic reflection surveying , 1997 .

[10]  K. Spikes,et al.  Ultrashallow seismic reflection monitoring of seasonal fluctuations in the water table , 2000 .

[11]  Don W. Steeples,et al.  Seismic Reflection Study of a Shallow Aquifer During a Pumping Test , 1987 .

[12]  A. Green,et al.  3-D high-resolution reflection seismic imaging of unconsolidated glacial and glaciolacustrine sediments: processing and interpretation , 2000 .

[13]  Don W. Steeples,et al.  Mapping a bedrock surface under dry alluvium with shallow seismic reflections , 1989 .

[14]  Don W. Steeples,et al.  Seismic reflections from depths of less than two meters , 1999 .

[15]  Richard D. Miller,et al.  Detecting Voids In a 0.6 M Coal Seam, 7 M Deep, Using Seismic Reflection , 1991 .

[16]  Tapan Mukerji,et al.  Fast 3D ultra shallow seismic reflection imaging using portable geophone mount , 2001 .

[17]  Portable dense geophone array for shallow and very shallow 3D seismic reflection surveying–Part 2: 3D imaging tests , 2004 .