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The inclusion of a geophysical section in this reference manual is a testament to the great leap forward that the geophysical discipline in general and the seismic method in particular have made in the last 15 years. To the geologist and engineer, geophysics has been the “black box” inaccessible to all but a few skilled practitioners. Despite impressive technology and computer power, the geophysicist was able to furnish only a fuzzy picture of the subsurface, highly subjective in its final interpretation and, generally, with neither the resolution nor repeatability to be of use in the development world.

The advent of three-dimensional (3-D) seismic surveys and computer-assisted interpretation have changed all that. The geophysicist can now contribute to the understanding of a reservoir on the scale necessary for development, both structurally and stratigraphically. Increasingly, a geophysicist is part of the team that concurrently uses all available data to obtain a better reservoir model and formulate a better development plan. Increasingly, geologists, reservoir engineers, and petrophysicists are being exposed to the practices of geophysics.

The purpose of Part 7 is to introduce the basic techniques and technology of geophysics, to facilitate communication among the disciplines, and to make geophysics more accessible to the practicing development geologist. As in other parts of the Manual, each chapter introduces concepts and terms, procedures and pitfalls only briefly and then points the interested reader in the direction of more detailed information.

This part begins with the seismic method, taking the reader from acquisition through processing and

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