AAPG Bulletin, V. 84, No. 8 (August 2000), P. 1205-1228.

Interpreting the Dimensions of Ancient Fluvial Channel Bars, Channels, and Channel Belts from Wireline-Logs and Cores¹

©Copyright 2000. The American Association of Petroleum Geologists. All rights reserved.
¹Manuscript received February 23, 1999; revised manuscript received November 30, 1999; final acceptance January 15, 2000.
²Department of Geological Sciences, Binghamton University, P.O. Box 6000, Binghamton, New York 13902-6000; e-mail: [email protected]
³ARCO Exploration and Production Technology, 2300 West Plano Parkway, Plano, Texas 75075.
Comments of the reviewers, Keith Shanley and Bill Galloway, are greatly appreciated.

ABSTRACT

A primary objective in exploration for and development of fluvial reservoirs is determining the thickness and width of sandstone-conglomerate bodies (mainly channel-belt deposits). Most of the existing techniques for estimating the dimensions of fluvial reservoirs have major drawbacks. A fresh approach to the problem is made using recent theoretical, experimental, and field studies. This new approach involves (1) new models for the lateral and vertical variation of lithofacies and petrophysical-log response of river-channel deposits with explicit recognition of the different superimposed scales of strata, (2) distinction among single and superimposed channel bars, channels, and channel belts, (3) interpretation of maximum paleochannel depth from the thickness of channel bars and the thickness of sets of cross-strata formed by dunes, and (4) evaluation of various methods for estimation of widths of sandstone-conglomerate bodies that represent either single or connected channel belts (outcrop analogs; correlation of sandstone-conglomerate bodies between wells; use of empirical equations relating channel depth, channel width, and channel-belt width; theoretical models; and three-dimensional seismic data).