About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 67 (2017), No. 1. (January), Pages 3-12

Sequence Stratigraphy, Chronostratigraphy, and Spatio-Temporal Stratigraphic Thickness Variation of the Agbada Formation, Robertkiri and Delta Fields, Niger Delta, Nigeria

Adewale Amosu, Yuefeng Sun

Abstract

The Miocene‚Äďaged deltaic Agbada Formation, Niger Delta, Nigeria, is composed of prograding sediments deposited on a series of basin-ward tilted normal faults, characterized by structural collapse. It consists of shallow marine and non-marine deposits overlying faulted collapsing sub-formation shale deposits. Sequence stratigraphic analysis of gamma ray wireline well logs shows that the Agbada Formation consists of at least four third order sequences. Thickness maps of the sequences and structural analysis of the sequence surfaces indicate rollover anticlinal structures reflecting the orientation of the underlying faults. Generally stratigraphic thinning of older sequences covers a wider areal extent than that of younger sequences and the sequences become thinner upward and landward. Chronostratigraphic analysis reveals the spatial variation in the location and zones of stratigraphic thinning. The stratigraphic thinning may be the result of erosion, non-deposition, or slower deposition. The spatial variation may be related to shift in fluvial deltaic deposition combined with a fall in the relative sea level.


Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Watermarked PDF Document: $14
Open PDF Document: $24