Sequence stratigraphic integration for Guardulio Member (Guafita Formation), Upper Miocene, Guafita field, Apure State, Venezuela
Keywords:
Guafita, Venezuela, Guardulio, Stratigraphy, Seismic, GeologyAbstract
Within the Guafita Formation, the upper member identified as Guardulio, consists of several sand bodies with limited lateral extension, embedded within a mainly shaly succession. This facies distribution causes a vertical and horizontal stratigraphic complexity vertically and horizontally. A characterization integrating core, well logs and 3D seismic data was performed to generate a sedimentological and also a sequence stratigraphic model. Guardulio, of early Miocene age was interpreted as a sequence limited by the SB-30/SB-21 unconformities. The core descriptions suggest a meandering fluvial system, composed of channels, point bars, crevasse splays and floodplains. The reservoirs containing hydrocarbons within the Guardulio Member, located in the Guafita field, are limited by markers that compare with pedogenetically altered horizons. Using 3D seismic, it was possible to recognize three seismic facies units coincident with sets of third-order, further subdivided into fourth-order parasequences. To define the system tracts, the degree of channel amalgamation was used as descriptive element to set the fluvial architecture. The morphological features of the sedimentary system were identified using proportional seismic slices, on the 3D cube, confirming the meandering fluvial character. The understanding of dimensions, geometry and orientation of the sandstone bodies, based on core, log and 3D seismic, will allow more reliable correlations, which will result in better definition for a hydrocarbon development plan of the field, as well as future development schemes using enhanced oil recovery methods.
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