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AAPG Bulletin

Abstract


Volume: 53 (1969)

Issue: 10. (October)

First Page: 2171

Last Page: 2178

Title: Paleostructure and Lithologic-Variation Coefficients: Their Use in Exploration for New Oil and Gas Pools

Author(s): S. T. Ovnatanov (2), G. P. Tamrazyan (2)

Abstract:

Many oil- and gas-producing areas have not been explored completely, and numerous producing fields--some of them very old--still may contain substantial undiscovered hydrocarbon reserves. The urgency of finding these undiscovered accumulations at minimum cost cannot be overemphasized. Most of them will be found in the deepest reservoir beds which, in many fields, have been explored the least.

Variations in lithologic character and the use of these variations in paleogeographic-paleostructural analyses provide auxiliary but useful methods for directing exploration work and for discovering new accumulations in hydrocarbon-bearing regions. The writers have utilized these methods, and have shown that they can be applied successfully in the Pliocene Productive Series of the Apsheron Peninsula region of the western Caspian Sea.

The methods are quantitative, but simple in formulation and use. Basically, four coefficients are determined: (1) the coefficient of lithofacies change (in a single sandstone bed), L; (2) the coefficient of individual sandstone-bed thickness variation, f; (3) the coefficient of sandstone-bed frequency, R; and (4) the coefficient of maximum hydrocarbon saturation, Q.

The results of these calculations provide valuable data on lithologic variability, nature and extent of sandstone buildups, and locations of the areas in which buildups are likely to occur. Because of the success that has resulted from application of these quantitative techniques, the writers recommend their use elsewhere by exploration geologists.

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