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A Rapid Visual Method for Estimating Sedimentary Parameters
Grover H. Emrich (2), Frank J. Wobber
To evaluate the large quantity of valuable geologic data potentially available in subsurface well cuttings when laboratory techniques cannot be used, a new method of determination is proposed. By this method sedimentary parameters are measured by visual estimation. It is based on an experimental study of median diameters and carbonate percentages.
A series of samples with known values are studied until a mental "image" of the values is formed. These samples are retained for later use as references. Samples with unknown values are then examined by the operator, the values are estimated and then determined by laboratory techniques, the estimated values are compared with the actual values, errors are noted, and estimated are revised accordingly. The method may then be applied to well cuttings. Once this mental image of a parameter is achieved, the acquired skill may be applied to many other problems. Both visual and statistical evaluations of the results show that the method is accurate, and it can be readily learned and applied.
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