3-D seismic survey design by Gijs J. O. Vermeer

By Gijs J. O. Vermeer

A necessary component for winning 3-D seismic survey layout is a simple realizing of the spatial homes of the seismic wavefield. those homes have been defined for 2-D seismic facts in Seismic Wavefield Sampling via an identical writer. This publication extends the outline into the even more advanced box of 3-D seismic information. A bankruptcy on guidance for survey layout interprets thought into perform. a few case histories illustrate the ideas. Noise suppression, solution, and imaging are mentioned intimately. Converted-wave survey layout is roofed in a separate bankruptcy. This publication offers crucial wisdom for any acquisition or processing geophysicist and is usually recommended to each person facing 3-D seismic information. An integrated CD-ROM additionally comprises an Acquisition layout Wizard and survey optimization software program.

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5 FACTORS AFFECTING THE RATE OF SCREENING A number of factors determine the rate at which particles pass through a screen surface and they can be divided into two groups: those related to particle properties and those dependent on the machine and its operation. Some important factors are: Material factors 1 2 3 4 5 Bulk density of the material. Size and size distribution of the particles. Size of the particle relative to the aperture. Shape of the particle. Moisture content of the material. 6 Size of the aperture.

For all practical purposes, the end point is considered to have been reached when there is little amount of material passing through after a certain length of sieving. Sieving is generally done dry. Wet sieving is used when the material is in the form of slurry. When little moisture is present, a combination of wet and dry sieving is performed by initially adding water. 2 TESTING METHOD The sieves chosen for the test are arranged in a stack, or nest, starting from the coarsest sieve at the top and the finest at the bottom.

The prerequisite for the development of a satisfactory flowsheet is the acquisition of a fully representative ore sample, even though, in respect of a new ore-body, this sample may have to be something of a compromise. A bad sample will result in wastage of all test work and can lead to a completely wrongly designed mill. A sample can be taken from any type of material dry, wet or pulp. But, in each case, the method of sampling and the apparatus necessary for them are different. A sample is collected from huge lot of dry material in stages.

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