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The purpose of this study is to investigate whether semi-regional stratigraphic studies may be combined with interpretations of the structural framework to aid in oil exploration for lenticular type reservoirs. This investigation requires an analysis of the basic factors controlling stratigraphic oil accumulation in a section characterized by alternating sandstones, shales, and lignites. The study deals with semi-regional analyses of restricted lithologic units which contain, in general, only one productive member. The results obtained show only the distributional patterns of sand and shale. No attempt was made to include the problem of origin of the sediments, their genetic history, or their environment of deposition since the study was not designed as an analysis of dep sitional history. This type study lies between broad, regional analyses of an entire section and detailed studies of a producing member of a particular oil field. This study, based on ½-kilometer control, was designed primarily to examine the potentialities of such an analysis. It is not implied that its importance is greater than either of the other types of stratigraphic investigation.
The area discussed lies within the central part of the Greater Oficina area, state of Anzoategui, Venezuela. The Oficina section includes approximately 50 productive sands; of these, 25 were studied in detail. The formations studied were chosen at approximately 100-foot intervals. Semi-regional base maps were first constructed on scale 1:50,000 and subsequently reduced to scale 1:250,000. Facies patterns are outlined by numbers and letters on the respective figures, and a discussion of these features constitutes a major part of the report. The features are outlined solely from analysis of electrical logs--direct measurements of the physical parameters from cores were not possible during the course of this study. Therefore, the term "facies" is used only to differentiate the various sh le, sand-shale, and sand developments which are portrayed by the maps.
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