Download Planning Land 3-D Seismic Surveys by Peirce, John; Galbraith, Mike; Cordsen, Andreas; Hardage, PDF

By Peirce, John; Galbraith, Mike; Cordsen, Andreas; Hardage, Bob Adrian

This publication offers readers the instruments to begin designing 3D seismic surveys. The colossal reports of the authors in designing and buying land 3-D seismic surveys make this a pragmatic and necessary ebook. Readers are anticipated to have a normal operating wisdom of 2-D seismic information acquisition, processing, and interpretation. a few three-D adventure is beneficial yet no longer essential to comprehend this fabric. useful workouts are incorporated to facilitate figuring out of the subject material. a few geophysicists will want to increase their wisdom of 3D layout by way of interpreting papers touching on their specific precise pursuits. A reference checklist and a set of different instructed studying are incorporated. A searchable CD-ROM of the whole contents of the booklet is also included.

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Extra info for Planning Land 3-D Seismic Surveys

Sample text

6 TOTAL FOLD The total 3-D nominal fold is the product of in-line fold and cross-line fold: total nominal fold ϭ (in-line fold) ϫ (cross-line fold). 5a), total nominal fold ϭ 6 ϫ 5 ϭ 30. This value is the same value initially calculated using the formula: Fold ϭ SD ϫ NC ϫ B2. 5b). This 3-D fold oscillation is undesirable and results from lengthening the receiver lines. There were no changes in the source or receiver intervals or in the line intervals. Note: The above equations assume that the bin size remains constant and is equal to half of the receiver interval, which in turn is equal to half the source interval.

For this system, the radio is a control unit for initiation of recording and quality control, but it is not used for data transmission. The recorder unit (dog house) has a complete set of electronics that allows data correlation (for vibrators) and the recording and display of shot records that show traces corresponding to all geophone groups. Some crews operate on a 24-hour basis to reduce the overhead cost per source point. One has to check whether local customs and/or laws and safety concerns allow such around-the-clock operation.

On a large 3-D survey, it might be justified to conduct the required tests at the start of the survey. Large surveys may require a variety of sources or receivers (such as in a transition zone), and several test sequences may be performed throughout the survey. Sometimes the local conditions are known well enough that a 3-D survey may proceed without any testing at all. Surveyors need to go to the field and establish a perimeter of the 3-D seismic survey before filling in the specific source and receiver lines.

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