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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 25 (1941)

Issue: 5. (May)

First Page: 930

Last Page: 930

Title: Davis Sand Lens, Hardin Field, Liberty County, Texas: ABSTRACT

Author(s): S. Russell Casey, Ralph B. Cantrell

Article Type: Meeting abstract

Abstract:

The Davis sand lens of the Hardin field is a buried off-shore barrier (bar). It is in the upper Saline Bayou member of the Yegua (upper Eocene) formation.

The sand was first recognized as a separate sand in the Woodley Petroleum Company's Emma Davis well No. 1; the sand was encountered at a depth of 7,511 to 7,525 feet. Two wells are now producing gas and distillate from this sand, and one well is producing 36° oil. It is a separate and closed reservoir.

An isopach map of the interval containing the Davis lens shows a marked thickening within the area where the best development of the Davis sand is found. It discloses that the bar along its long axis is approximately 9,400 feet in length, and the width varies from approximately 300 feet to 1,200 feet. The total area covered by the lens is approximately 250 acres. The contours of the isopach map are lines of sedimentation from which the section to be penetrated may be postulated in advance of the drill.

The Davis "zone," wherein the lens is found, is composed of alternating sand, sandy shale and shale, and is arenaceous in character indicating lagoonal or tidal-flat deposition. The main sand is a medium-grained quartz sand, containing few other minerals, as compared to the finer-grained, more mineralized sands of the Yegua formation.

The lens was laid down as a barrier beach or off-shore bar by a retreating Yegua sea.

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