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pre-rig mobilization hazard evaluation in offshore oil and gas prospect drilling:A case study of TM field,offshore Niger Delta

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能源地球科学(英文) 2023年第1期4卷 158-178页

作者： Oluwatimilehin B.Balogun Olajumoke C.Akintokewa Department of Geosciences Mountain Top UniversityPrayer CityOgun StateNigeria Department of Geology Obafemi Awolowo UniversityIle-IfeNigeria

TM Field,located offshore Niger Delta in the Gulf of Guinea(Nigeria),has been evaluated for potential drilling hazards prior to the drilling of a proposed oil *** is in a region where potential hazards that could inhibit successful drilling exercise have not been adequately *** study adopted the modern technique of offshore geohazard evaluation that relies mainly on suites of geophysical and shallow geological investigations which include ocean bathymetry using multi-beam echo sounder,sidescan sonar,sub-bottom profiler,magnetic,and 2D-high resolution seismic reflection *** results were integrated to draw inferences about the risk potential of the *** the bathymetric survey,water depths were found to range from 345 m to 650 m LAT,with seabed relief being 305 *** depth at the proposed well location was found to be approximately 450 m and the seabed was found to slope in the northwestern *** gradient was computed as 0.05 across the whole *** shallow sub-surface stratigraphic units,labelled A and B,were *** A was directly beneath the seafloor and seemed to be composed mainly of clayey/silty *** thickness ranged from 6 m to 70 m across the study *** B appeared to be a layer of sand and its total thickness was not fully *** kinks and displacements at the flanks of seabed undulations/depressions on subbottom profiler sections suggested that the depressions may be *** the map generated from the marine magnetic data,a magnetic fault was delineated and this appeared to be coincident with the shallower of the two buried faults on the cross-line seismic section cutting through the proposed well-head *** seismic reflection data presented this fault as being *** of the faults mapped,especially the buried ones,appeared to be inactive except a *** with mapped amplitude anomalies are to be avoided during rig-mobilization *** e

关键词： pre-rig mobilisation Ocean bathymetry Side-scan sonar Sub-bottom profiler Marine magnetic survey Amplitude anomalies

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