[PDF][PDF] SEQUENCE STRATIGRAPHIC IMPLICATION TO HYDROCARBONEXPLORATION IN “BETA FIELD”, NORTHERN DEPOBELT OF THE NIGER DELTA BASIN

AJ Ukpong, TC Anyanwu - International Journal of Recent Trends in …, 2018 - academia.edu
International Journal of Recent Trends in Engineering and Research, 2018academia.edu
Seismic and checkshot data, geophysical data and biostratigraphic data extracted from ditch
cutting samples, were used for the sequence stratigraphic analysis of Beta-24 well within the
Beta field, Northern depobelt of the Niger Delta basin. The results revealed three Maximum
Flooding Surfaces and three Sequence Boundaries. Systems tracts; Highstand Systems
Tract, Transgressive Systems Tract and Lowstand Systems Tract were identified within the
well. Foraminiferal bioevents: Last Downhole Occurrence (LDO) of Globigerina …
Abstract
Seismic and checkshot data, geophysical data and biostratigraphic data extracted from ditch cutting samples, were used for the sequence stratigraphic analysis of Beta-24 well within the Beta field, Northern depobelt of the Niger Delta basin. The results revealed three Maximum Flooding Surfaces and three Sequence Boundaries. Systems tracts; Highstand Systems Tract, Transgressive Systems Tract and Lowstand Systems Tract were identified within the well. Foraminiferal bioevents: Last Downhole Occurrence (LDO) of Globigerina ampliapertura at 2928m, First Downhole Occurrence (FDO) of Bolivina ihuoensis at 2768m and the LDO of Bolivina imperatrix at 2648m delineated from the well were used to date the interpreted surfaces with the aid of the Niger Delta chronostratigraphic chart. The ages assigned to the Maximum Flooding Surfaces (MFS: 1, 2, 3) were 38.0 Ma, 36.8 Ma, 35.9 Ma respectively and sequence boundaries (SB: 1, 2, 3) were 37.3 Ma, 36.3 Ma and 35.4 Ma respectively. The depositional environment of the sediments penetrated by the well were inferred based on well log signatures and biostratigraphic information to have fluctuated from non-marine through coastal deltaic to marine. The Maximum Flooding Surfaces and Sequence Boundaries identified from the foraminiferal-well log sequence stratigraphy were tied to seismic using checkshot data. Seismic stratigraphic interpretation revealed two key bounding surfaces, two systems tracts and two major faults in the field. The faults (F2 and F3) were responsible for the structural truncations that limited the recognition of strata terminations in the vicinity of the well. An observation of the horizons within the systems tracts revealed that they may have potentials to serve as excellent reservoir rock and seals.
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