Sequence stratigraphic interpretation of parts of Anambra Basin, Nigeria using geophysical well logs and biostratigraphic data

Anakwuba, Emmanuel; Ajaegwu, N. E.; Ejeke, C F; Onyekwelu, C.U.; Chinwuko, Augustine Ifeanyi

doi:10.1016/j.jafrearsci.2017.12.018

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…Sistem traktus diklasifikasikan menjadi tiga, yaitu Lowstand System Tract (LST), Transgressive System Tract (TST) dan Highstand System Tract (HST) (Catuneanu, 2002). Model analisis urutan stratigrafi sederhana didasarkan pada karakteristik log GR dalam menentukan permukaan stratigrafi (Anakwuba et al, 2018). Pola log GR memiliki konsep dasar yang mencirikan perubahan energi pengendapan sedimen yang memengaruhi ukuran butir dan rangkaian parasekuen.…”

Section: Penentuan Tanda Permukaan Stratigrafiunclassified

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Analisis Lingkungan Pengendapan Dan Sistem Petroleum Berdasarkan Integrasi Data Seismik Dan Sumur Di Pesisir Cekungan Sumatra Tengah

Ordas,

Abdurrokhim,

Sendjaja

et al. 2023

J. Ilmu dan Teknologi Kelautan Tropis

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Cekungan Sumatra Tengah merupakan salah satu cekungan penghasil hidrokarbon di Indonesia, karena keterbatasan ekplorasi dan studi, perkembangan cekungan tersebut mengalami hambatan. Penelitian ini bertujuan untuk mengidentifikasi lingkungan pengendapan dan sistem petroleum melalui studi stratigrafi seismik dan sumur. Penelitian ini menggunakan metode seismik dengan software Hampson Russell dan Petrel. Data log membantu pengolahan data seismik dengan software Interactive Petrophysic (IP) dan Techlog untuk pengolahan data sumur. Zona penelitian ini memiliki lima sekuen pengendapan yang sebagian besar terbentuk di lingkungan pengendapan alur bercabang dan estuari. Terdapat dua batuan induk potensial, yakni pada Formasi Pematang dan lapisan serpih pada TST-1 atas. Hasil analisis sekuen stratigrafi pada penampang seismik, sistem petroleum teridentifikasi pada Sumur Merak, Melibur, dan Garib di pesisir Cekungan Sumatra Tengah. Reservoar hidrokarbon terdapat di Formasi Bekasap, Bangko, Menggala, dan sebagian Formasi Pematang; batuan induk terdapat di sebagian Formasi Menggala dan Pematang. Penentuan lapisan reservoar dan batuan induk diperkuat oleh hasil analisis sumur yang terletak pada lintasan seismik. Patahan berguna sebagai jalur migrasi fluida hidrokarbon dari batuan induk hingga reservoar, sehingga terbentuk sistem petroleum pada daerah tersebut. Lapisan ini memiliki batuan induk yang belum matang dan matang. Karenanya dapat disimpulkan bahwa lingkungan pengendapan dan sistem petroleum pada sumur-sumur di daerah tersebut dapat diketahui.

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Section: Penentuan Tanda Permukaan Stratigrafiunclassified

“…Gambar 4. Identifikasi penanda permukaan stratigrafi berdasarkan pola log GR (Anakwuba et al, 2018).…”

Section: Penentuan Tanda Permukaan Stratigrafiunclassified

Analisis Lingkungan Pengendapan Dan Sistem Petroleum Berdasarkan Integrasi Data Seismik Dan Sumur Di Pesisir Cekungan Sumatra Tengah

Ordas,

Abdurrokhim,

Sendjaja

et al. 2023

J. Ilmu dan Teknologi Kelautan Tropis

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“…The Anambra Basin covers an area of about 40,000 km 2 with a sedimentary sequence of 9 km in thickness (Akaegbobi, 2005). Previous studies classified the Anambra Basin by eight geologic formations that include the Benin (Ogwashi-Asaba) formation, Nkporo/Enugu shale, Mamu formation, Ajali sandstone, Nsukka formation, Imo formation, Ameki formation/Nanka sand and Alluvium (e.g., Reyment, 1965;Obi et al, 2001;Igwe et al, 2013;Nwajide, 2013;Anakwuba et al, 2018). The Ameki formation consists of fossiliferous greyish-green sandy clay with calcareous concretions and white clayey sandstones.…”

Section: Geological and Statistical Analysismentioning

confidence: 99%

Selection of an Optimum Global Gravitational Model for Geological Mapping of Afikpo and Anambra Basins in Nigeria

Apeh

Tenzer

2022

Geodesy and Cartography

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Combined Global Gravitational Models (GGMs) are being used in numerous geoscience applications, most notably for gravimetric geoid modeling (in geodesy) and for geological mapping and geophysical explorations (in the Earth’s sciences). The aim of this study is to evaluate the suitability of different combined GGMs that could be used for the geological mapping of middle belt region and Southeastern Nigeria. For this purpose, we digitized geological maps of Afikpo and Anambra Basins to evaluate geological signatures implied by gravity field quantities (Bouguer gravity anomalies and vertical gravity gradient) derived from the EGM2008, EIGEN-6C4, GECO, SGG-UGM-1 and XGM2019e_2159 gravitational models. We also stochastically evaluated the performance of these GGMs by computing their Root-Mean-Square (RMS) fit with ground-based gravity measurements. The results show that the EIGEN-6C4 and XGM2019e_2159 models have the best RMS fit with the ground-based gravity data. A spatial pattern in Bouguer gravity maps (compiled using these two models) generally closely agrees with a geological configuration of the basins, while also exhibiting some more detailed geological features. Interestingly, however, despite the XGM2019e has the best fit and better mimics major geological features, the gravity image from this model does not exhibit a sediment signature in a portion of the Afikpo basin. A possible reason is that the topographic information used to recover a higher-frequency gravity spectrum of this model might suppress a gravitational signature of subsurface density structures. A comprehensive interpretation of geological features thus requires a careful analysis of existing GGMs, terrestrial gravity data as well as all other reliable geological and geophysical information.

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“…Symmetrical shape is formed as gradual cleaning upward trend which changes from its maximum value with dirtying uptrend of similar grain size without sharp breaks. Serrated/ irregular shape is characterized as fluctuated GR reading with high and low values over very short vertical interval of well profile, which indicates laminated beds of sand and shale [10].…”

Section: Identification Of Stratigraphic Surface Markersmentioning

confidence: 99%

Depositional sequence interpretation using seismic and well data of offshore Central Sumatra Basin

Nainggolan¹,

Nurhasanah

Setiadi³

2021

IOP Conf. Ser.: Earth Environ. Sci.

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Offshore Central Sumatra Basin is an integral part of Central Sumatra Basin known for producing hydrocarbon basins. The derivation of stratigraphic study of seismic and well data is intended to improve accuracy of geological interpretation. Sequence stratigraphy studies have a significant role in exploratory studies to determine which depositional sequence can be inferred as hydrocarbon reservoir and its correlation in petroleum system. This study aims to identify biogenic gas sequential interpretation using seismic and well data of offshore Central Sumatra Basin. The procedure to analyze sequence stratigraphy is to identify stratigraphy surface markers using GR log, then map these markers to the seismic section that has been tied with good data to determine the distribution of each stratigraphy sequence. This study area has five depositional sequences, which are predominantly formed in marine depositional environments. Potential source rock in this area is at DS-1 which has a lacustrine depositional environment with euxinic conditions. The euxinic shale at the upper TST-1 deposit could be a source rock with hydrocarbon migration through faults. Biogenic gas reservoir potential is in Petani Formation (DS-5). Shale in MFS-5 and HST-5 could be a hydrocarbon trap, whereas LST-5 and TST-5 sandstone deposits can be a reservoir.

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Sequence stratigraphic interpretation of parts of Anambra Basin, Nigeria using geophysical well logs and biostratigraphic data

Cited by 11 publications

References 2 publications

Analisis Lingkungan Pengendapan Dan Sistem Petroleum Berdasarkan Integrasi Data Seismik Dan Sumur Di Pesisir Cekungan Sumatra Tengah

Analisis Lingkungan Pengendapan Dan Sistem Petroleum Berdasarkan Integrasi Data Seismik Dan Sumur Di Pesisir Cekungan Sumatra Tengah

Selection of an Optimum Global Gravitational Model for Geological Mapping of Afikpo and Anambra Basins in Nigeria

Depositional sequence interpretation using seismic and well data of offshore Central Sumatra Basin

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