Example is one of the better teachers. Examination of successful surveys that achieve the defined objective within practical constraints is helpful in designing a survey for a particular area. Several case histories which illustrate various principles follow without much editorial comment. The first case history shows two methods for reducing costs by acquisition and processing techniques. The second example features a combined land, beach, shallow water, and marine survey. The survey area includes some usual and unusual obstacles. The objective was to maintain enough similarity in attributes to link the resulting seismic sections. The third example illustrates the resolution possible with 3-D seismic data on a very shallow survey. There are some good examples in this study of the effect of source power and fold. Resolution of less than 10 ft was an objective and was achieved.
There are many examples to be found in various types of publications. Contractor companies have distributed brochures of examples. The Leading Edge, Geophysics, and Expanded Abstracts of the Technical Program with Authors’ Biographies are other sources for those wishing to study examples. In a few studies, the parameter testing and modeling steps are shown, but these are the exception. Such tests tend to remain proprietory. The new aspect of these tests is that the modeling takes place in three dimensions. The experience of the survey designer in 2-D modeling and testing should be applicable to the 3-D test. Behind each one of the histories lies information gathering, testing, and modeling, and perhaps experience
Figures & Tables
“Written for both the nongeophysicist and the practicing geophysicist, this book collects many of the formulas, principles, concepts, and field approximations of seismic survey design. The basics of 2D and 3D design in this book offer an introduction to the nongeophysicist and provide a good review for the practicing geophysicist. Arrays, obstacles, and special problems are discussed, as are aspects introduced by 3D surveys. The author explores design attributes such as fold, costs, and field time.”