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Sequence stratigraphic analysis and hydrocarbon prospectivity of AMO Field,deep offshore Niger Delta,Nigeria

Energy Geoscience 2022年第1期3卷 80-93页

作者： Adeniyi Amodu oluwaseye peter oyetade Suyi Lawrence Fadiya Oluwabamiwa Fowora Department of Geology Modibbo Adama UniversityYolaNigeria Department of Geology University of CalabarCalabarNigeria Department of Geology Obafemi Awolowo UniversityIle IfeNigeria Conoil Producing Limited LagosNigeria

An integrated interpretation of processed 3D seismic data,a suite of well logs,biostratigraphic data and core photographs of AMO Field,deep offshore Niger Delta,is carried out for the sequence stratigraphic analysis of strata penetrated by *** and key stratigraphic surfaces,that is,the maximum flooding surfaces(MFSs)and sequence boundaries(SBs),are identified based on bioevents and log *** data help the delineation of MFSs and SBs,as well as dating,determination of depositional environment and *** sequence stratigraphic study reveals seven MFSs(of 13.0 Ma,11.0 Ma,9.5 Ma,7.4 Ma,5.8 Ma,5.0 Ma and 2.7 Ma)and six SBs(of 12.1 Ma,10.3 Ma,8.5 Ma,6.3 Ma,5.5 Ma and 4.2 Ma).The key stratigraphic surfaces identified involve three depositional sequences characterized by lowstand,transgressive and highstand system tracts *** studied section is deposited in a deepwater environment ranging from Lower to Upper Bathyal and can be dated back to the Middle Miocene-Middle Pliocene in *** faults and two horizons(corresponding to reservoir units)are identified and mapped across the seismic data volume to establish a continuity of the reservoir to areas lacking well *** established sequence stratigraphic framework displays successions of sediments(system tracts)where the reservoir sand units of the lowstand and highstand system tracts are of hydrocarbon prospective units in the field.

关键词： Sequence stratigraphy Bioevents Depositional environment AMO Field Niger Delta

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Trace and rare earth element geochemistry of the black and grey shales of the Calabar Flank, Southeastern Nigeria: constraints on the depositional environment and the degree of metal enrichment

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Acta Geochimica 2021年第3期40卷 312-324页

作者： Christopher Iorfa Adamu Benjamin Odey Omang oluwaseye peter oyetade Otu Johnson Therese Ntonzi Nganje Department of Geology Faculty of Physical ScienceUniversity of CalabarCross River StateNigeria Department of Geology Faculty of ScienceUniversity of BeninEdo StateNigeria

This study focuses on the trace and rare earth elements(REE)geochemistry of the Nkporo and Ekenkpon Shales of the Calabar *** main aim is to infer their depositional environment and the degree of their metal *** shale samples were analyzed using inductively coupled plasma mass *** results indicated that the mean concentrations of K,Na,and Fe in Nkporo and Ekenkpon Shales are 1.45,0.4,and 4.17 wt%,and 1.11,0.44,and 5.42 wt%;*** Nkporo Shale is enriched with the following trace elements;P>Mn>Sr>Ba>Zn>Ce>Rb>Zr>V>Cr>Ni and depleted in the following trace elements;Ta>Ge>Sb>Bi>Cd>Ag>Te>In>*** the Ekenkpon Shale is enriched with the following trace elements;P>Mn>Ba>Sr>V>Ce>Zr>Rb>Cr>Zn>Ni and depleted in;Sb>Ge>Bi>Ag>Ce>Te>In>*** concentration of redox-sensitive elements such as V,Ni,Mo,U,Cu,Cr,Re,Cd,Sb,Ti,Mn,and their ratio V/Mo and U/Mo in the black and grey shale samples show different *** REE obtained from the Nkporo and Ekenkpon Shales were PAAS *** Nkporo Shale showed a slightly flat light rare-earth element(LREE),middle rare-earth element(MREE),and heavy rare earth element(HREE)pattern ***/Ce*ranges from 0.95 to 1.09 in Nkporo Shale and 0.67 to 1.40 in Ekenkpon *** Ekenkpon Shale showed a slight LREE,MREE enrichment,and depleted HREE *** Mn contents and U/Mo ratio in Nkporo and Ekenkpon Shales suggests a poor oxygen transitional *** V/Mo and V/(V+Ni)ratios indicated that the Nkporo shales were deposited in an anoxic to suboxic conditions and Ekenkpon shales were also deposited under an anoxic to suboxic *** V/Ni ratio indicated that the organic matter in the Nkporo shale is terrigenous while that of the Ekenkpon shales are both terrigenous and marine in origin.

关键词： Rare-earth elements(REE) Trace elements Calabar Flank Suboxic Anoxic

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