Abstract

Abstract Studies of reservoir behavior of 12 Smackover limestone oil and condensatepools are presented. Buckner, Midway, McKamie, Magnolia, Mt. Holly, Schuler(Reynolds) and Village are treated in considerable detail and subjected toanalysis with an electrical device for analyzing reservoir behavior. Resultsand comparisons of these analyses are presented. In addition to these reservoir-behavior studies, an attempt is made to assembletransmissibility and storage data on the Smackover limestone formation fromcores and logs taken in dry holes and producers. This together with thebehavior of individual reservoirs leads to a better understanding of theformation as a porous aquifer. The ultimate purpose of this type of study is to improve predictions concerningthe future behavior of these pools in such a system. Predictions are presentedfor several pools. Introduction In 1937 the Phillips Petroleum Co. drilled its J. D. Reynolds No. 1 to the Smackover limestone formation at Snow Hill, Arkansas. This well found oil inthe porous, permeable, upper part of the Smackover thereafter referred to asthe Reynolds lime. Since then, six oil pools and six condensate pools have beendiscovered in the Reynolds lime, and more than 75 dry holes have explored partsof this formation. By the first of 1943, 44 million barrels of oil and 83 billion cubic feet ofgas had been withdrawn from the various reservoirs. The original reservesestimated by the Arkansas Oil and Gas Commission were 342 million barrels ofoil and 1200 billion cubic feet of gas. So far all of the production has been from anticlinal structures, most of whichare asymmetric and have their axes roughly perpendicular to the dip of theformation top. This is indicated in Fig. 1, which shows the pools, dry holesdrilled, and contours on top of the Smackover. These pools are of particular interest for reservoir-behavior studies becausethe production and drilling has been controlled, and in most cases the recordsof reservoir data are complete. In addition to the excellent production andpressure information available, more than one half of the wells drilled werecored and all of them were electrically logged. All of the pools show evidenceof water drive. While this paper is in a sense a collection of reservoir-behavior studies forseveral different pools, there has been an attempt to go one step further andto show the importance of the formation as a porous continuum or a singleaquifer in which the withdrawals of fluids from any pool has an. importanteffect on the behavior of all of the pools. An effort will be made to show thatthe water drives of these pools are dependent upon a much larger area of theSmackover limestone than that occupied by the petroleum accumulations. T.P. 1728

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