Lithological attributes of hd-001 well, shallow offshore, Niger delta basin, Nigeria

Olubusayo A Olatunji,Usman S Onoduku,Yahya B Alkali,Edward A Okosun

doi:10.14419/ijag.v9i1.31226

Olubusayo A Olatunji, Usman S Onoduku + Show 2 more

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https://doi.org/10.14419/ijag.v9i1.31226

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Abstract

Lithological analysis was carried out on 96 ditch cuttings samples from HD-001 well located within the shallow offshore Niger delta basin, Nigeria. Three lithofacies sequences were delineated by the integration of wireline logs textural/lithologic attritudes and the distribution of index accessory minerals. They are transitional paralic, paralic and marine paralic sequences. The lithologic, textural and wireline log data indicate that the entire interval studied in the HD-001 well belongs to the Agbada Formation. The Formation is made up of alternating sand and shale units which suggests rapid shoreline progradation. The grain size increases from essentially fine to medium-grained at the basal part of the well to dominantly coarser grain at the upper part. The index accessories recognize shallow marine to coastal deltaic settings environment of deposition. Sand bodies which represent sub-environments within those settings are deposited in sequences. Each sequence begins with a transgressive phase followed by significant regressions.Â Â Â

Highlights

The Niger delta basin covers a territorial area of about 140,000 sq.km in the continental margin of the Gulf of Guinea on the coast of west Africa (Obaje, 2009)
These permitted the assignment of the entire study section (4875 – 12090 ft) of HD-001 well of the Agbada Formation
These criteria enabled the recognition of three lithofacies sequences; The marine paralic, paralic and transitional paralic lithofacies sequences within the section. (Table 1)

Summary

Introduction

The Niger delta basin covers a territorial area of about 140,000 sq.km in the continental margin of the Gulf of Guinea on the coast of west Africa (Obaje, 2009). It lies between Latitudes 4° and 6° N and Longitudes 3° and 6° E in the southern part of Nigeria (Ojo et al, 2009). During the Cenozoic, until the Middle Miocene, the Niger delta evolved through stages of sedimentation over an oceanward-dipping continental basement into the Gulf of Guinea (Reijers, 2011). This study is aimed at analyzing the lithofacies sequences penetrated by HD-001 well and to describe the lithological attributes of the sequences interpreted using ditch cuttings, wireline logs, textural/lithological characteristics and the distribution of index accessories such as ferruginous materials, carbonaceous fragments and mica flakes

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