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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 68 (1984)

Issue: 4. (April)

First Page: 483

Last Page: 483

Title: Fast Reservoir Calculations Using Seismic Data and Well Logs: ABSTRACT

Author(s): Gary Hamill

Abstract:

A fast, new technique has been implemented to encourage Previous HiteffectiveNext Hit, realistic appraisals of hydrocarbon prospects at an early stage in the exploration of an area. A FORTRAN program using a modest amount of memory uses wavelet-processed, inverted seismic data control and existing petrophysical information to predict the dollar value of in-place reserves at potential drilling locations.

The data base is composed of the following input: (1) an estimate of the volume of closure of the anomaly, determined from conventional seismic structure mapping; (2) spatial distribution of transit times at the level of interest, which contribute to calculation of Previous HiteffectiveTop porosity in a volumetric sense; and (3) well-logging parameters such as water saturation, true resistivity, water resistivity, shale fractions, and other coefficients that characterize the properties of the rock system. Also, an interpreter may superimpose a geologic model by smoothing and interpolating such data appropriately.

Recovery of reliable low-frequency velocity information from inversion is critical. Acoustic and electric data are crossplotted to determine, in a statistical sense, how plausible it is that the rock-fluid system being described is the anticipated target zone.

Fast reservoir calculations in the Western Canada and Williston basins have produced reasonable bids for Crown land sales.

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Copyright 1997 American Association of Petroleum Geologists