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Before a survey begins in a new area, there should be a review of the local geology, past seismic surveys and well-log data, and seismic interpretation objectives. A knowledge of such data allows forward planning of the geophysical operations to ensure objectives are met. The local geology will provide information on geologic parameters that will affect the survey, such as the target depth, geologic features of interest, the maximum dip to be expected, and the level of resolution needed to image the target adequately. Past seismic survey data can act as a guide for the success of proposed geophysical parameters. For example, if one proposes to use a source at least as strong as that used in earlier work, and the earlier source successfully illuminated the target, then the proposed source also should succeed. Past survey data also can show where problems existed and how they were overcome and if economical data-quality improvements are feasible. Once the geophysical parameters have been established for a survey, they must not be changed without contractor approval from the client company. This chapter discusses how to determine the field parameters needed to meet the goal of recording the highest quality 2-D field data. The special requirements of 3-D surveys are considered in Chapter 7.

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