Thick lenticular Wilcox sandstone bodies of fluvial channel, bar-finger, or marine-bar origin are favored objectives of drilling in the active Mississippi-Louisiana Wilcox (Eocene) play. Correct utilization of diameter surveys will facilitate development and exploration drilling for these thick sandstone bodies. Detailed computation with a maximum number of computation levels is necessary; also, detailed analysis by geologically oriented personnel is essential.

An approach to sandstone-trend determination is presented using sandstone cross-bedding and counter-regional dip due to differential compaction. Substantiation is provided by an example area, Milligan Bayou field, Avoyelles Parish, Louisiana.

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