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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 40 (1990), Pages 69-71

A Comparison of Previous HitDepthNext Hit-Conversion Methods in the Gulf of Mexico

Melvan D. Carter, Gary R. Hyatt

ABSTRACT

The conversion of two-way seismic times into a Previous HitdepthNext Hit picture has been done Previous HitusingNext Hit two versions of three different methods for a proprietary study area in the Gulf of Mexico. From the simplest constant-function approach to the "layer-cake" method to an average-Previous HitvelocityNext Hit technique based upon seismic velocities, each method has advantages and disadvantages. Four time horizons were converted Previous HitusingNext Hit each method and calibrated at nine well locations. The shallowest and flattest marker has a variable mean error (from 0 to 93 feet) but a relatively stable standard deviation (from 22 to 43 feet). The deepest reflection has a highly variable mean error (from 0 to 474 feet) and an almost equally variable standard deviation (from 75 to 280 feet). This mistie study examines the Previous HitdepthNext Hit-conversion error as a function of layer, Previous HitdepthNext Hit and space. While the results cannot be generalized blindly, the seismic average-Previous HitvelocityNext Hit technique calibrated to the wells was the best method for the four horizons. It is noteworthy that the "layer-cake" result Previous HitusingNext Hit a constant Previous HitdepthNext Hit normalized interval Previous HitvelocityNext Hit was slightly better than a full-blown seismic-Previous HitvelocityNext Hit technique for the deepest horizon. Because the conversion of time into Previous HitdepthNext Hit is done with some measure of uncertainty, it is vital that the final Previous HitdepthNext Hit map be quantified as to accuracy. For the explorationist, it is imperative that the best technique for Previous HitdepthTop conversion be used as dictated by the exploration objectives and the available time and resources.


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