AAPG Southwest Section

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Depositional Environment, Sequence Stratigraphy and Petrophysical analysis of the Wolfcamp Debris Flow, delaware Basin: Case Study - mendel Field (Mendel EST 1-34 and mendel EST 3-34)

Abstract

The Wolfcamp debris flow of the Delaware basin has a range of properties that varies in lithology, grain texture and fossil types which have impact on determining major geologic processes and reservoir characterization. This study is focused on using core data and well logs to determine the depositional environment of the debris flow deposit, pick cycles and correlate wells and do a petrophysical analysis using the available wells within the field. The Delaware basin consists of several stratigraphic units which developed from the middle Pennsylvanian time through the Cenozoic era with the Wolfcamp debris flow being one of the several deposits. The Wolfcamp deposit of the Delaware basin has been subdivided into five stratigraphic units as identified by Previous works. The Wolfcamp unit consists of siliciclastics, carbonates and debris flow deposits which were deposited across different environments, from the shelf to basin deposit at distinct sea level positions. Core analysis of the study wells include the detailed core description and thin sections from depths of interest. The Well log analysis includes correlating across wells, picking cycle tops, processing and interpreting the well logs to characterize the different lithology, reservoir and fluid type identification. Based on the presence of major fossils like Fusilinids and Brachiopods within the cores, it is confident to say that the Wolfcamp debris flow is of Basinal origin.