TECHNICAL PAPERS
A Statistical Workflow to SeismicBalance
Seismic Balancing to Improve Interpretation Results - A Case Study from the Joseph Bonaparte Gulf Keith Woollard GeoCom Services Australia Woodside Energy Limited and Shell Developement Australia were recently awarded 3 exploration permits in the southern Bonaparte Basin. 6500 kms of 2d data has since been acquired and processed. A dataset consisting of 577 2d seismic lines, totaling over 20000km, had previously been loaded to SeisWorks as 8 bit integer. The original processing, and reprocessing, of these lines had used widely varying parameters, as had the workstation load. It was decided to use SeismicBalance, along with statistical analysis tools, to match the time, phase and amplitude of the existing project. Landmark's Release 98+ version of SeismicBalance was used as it contained several significant improvements over previous version. The technique employed was instrumental in identifying dataloading errors in the original dataset, thus increasing the reliability of the final project. The Use of Compression Technology to Aid Seismic Interpretation in the North West Shelf, Australia Landmark's upcoming SeisWorks Release (1998.5) incorporates new storage formats for seismic data that include compression. Whilst this compression is not "loss less", it is vastly superior to 8 or 16 bit integerisation.
Increases in Dynamic Range Through Trace Dependent Scaling in IESX
IESX is unique amongst UNIXseismic interpretation systems due to the application of a trace dependent scalar. This simple technology allows better amplitude preservation when loading data to integer format.
Using Landmark Utilities to Merge 3D Surveys
The release of 3d/3d merge a number of years ago has improved dramatically the Geoscientists ability to interpret multi survey projects. In some cases, however, there is a need to deal with multi surveys as one dataset. In this case study a shallow target was identified at the overlap between two older 3d surveys. As the prospect relied heavily on time slice interpretation it was decided to attempt a post-stack 3d/3d merge. The surveys were first matched using SeismicBalance and then merged to a new survey using bcm. A rudimentary “bin-borrowing” technique was used to augment the sparsely sampled older survey. The results achieved were surprisingly good from what can only be described as worst case input data.
For further information on any of the above papers, please contact us.
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