--> Abstract: Tectonosequence Interpretation across the Patao High in the Carupano Basin, Offshore Northeastern Venezuela, by Valencia, Yoryi M. and Ramirez, Rafael; #90166 (2013)

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Tectonosequence Interpretation across the Patao High in the Carupano Basin, Offshore Northeastern Venezuela

Valencia, Yoryi M.1 and Ramirez, Rafael
1[email protected]

The Patao High is a structure, oriented approximately E-W, located in the Carupano Basin offshore Venezuela containing four gas fields with an estimated potential of 14 TCF. Reservoirs discovered in this structure vary from deltaic to turbiditic deposits. Using two- (2-D) and three-dimensional (3-D) seismic surveys, well logs, and biostratigraphic record, we conducted a study of the Neogene and Quaternary deposits to identify four tectonosequences on the basis of seismic stratal terminations and regional tectonism and their implications for paleogeographic interpretation of Patao High.

Each tectonosequence comprises Cenozoic sediments, overlaying Cretaceous strata of and bounded above and below by unconformities. The lowermost sequence SM1-SM2is characterized by incised-valley fill deposits at the top of the paleo-structure. This sequence was deposited during Early Miocene to Mid Miocene based on the biostratigraphic record and is related to basement uplift, transpression and subsidence of the basin. The thickness map for this sequence suggests that the depocenter of the basin was located SW of the Patao High. The second sequence SM3 is considered the most important in terms of hydrocarbon content because of the presence of main reservoirs. It is defined as a condensed section deposited in the Late Miocene. In addition, reactivation of the basement uplift has been the most significant regional tectonic event affecting formation of SM3, and the upper sequences SPL and SPP. However, provenance of sediments of SPL (Pliocene) indicates that two uplifted areas occured in the Carupano Basin and the depocenter was located in the northwest area of the Patao High. The architecture of the SPP Sequence (Pleistocene) and overlying recent sediments, confirm that depocenter is currently located at the northeastern of the Patao High.

 

AAPG Search and Discovery Article #90166©2013 AAPG International Conference & Exhibition, Cartagena, Colombia, 8-11 September 2013