Addax Petroleum (fka AXC)

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Now here is some really good news on the JDZ: Thanks to King!

International Conference and Exhibition, Barcelona, Spain, 3-6 April 2016

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Abstract
Muhammad Tamannai, Sam Hosseinzadeh, and Matthew Tyrrell (2016) Petroleum exploration opportunities in the joint development zone (JDZ) revealed by quantitative seismic interpretation. International Conference and Exhibition, Barcelona, Spain, 3-6 April 2016: pp. 157-157.
doi: 10.1190/ice2016-6336340.1

Petroleum exploration opportunities in the joint development zone (JDZ) revealed by quantitative seismic interpretation
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Title Information
International Conference and Exhibition, Barcelona, Spain, 3-6 April 2016
SEG Global Meeting Abstracts
Technical Program Chairperson(s): Malcolm Francis, Fiona MacAulay
ISSN (online): 2159-6832
Copyright Year: 2016
Pages: 356
Publisher: Society of Exploration Geophysicists and American Association of Petroleum Geologists
Keywords
3D
Authors: Muhammad Tamannai, Sam Hosseinzadeh, Matthew Tyrrell
PGS
The Joint Development Zone (JDZ) lies on the southern front of the Niger Delta between Nigeria and São Tomé and is part of the structurally complex outer compressional zone of the Niger Delta and associated with E-W trending toe thrusts. This tectonic setting provides numerous structures for hydrocarbon entrapment that has led to many commercial petroleum discoveries in the region and it has remaining hydrocarbon potential.

The JDZ is in part covered by PGS multi-client 3D seismic which forms the study area. PGS has conducted an integrated study, including well analysis, seismic interpretation and quantitative seismic interpretation using a large exploration dataset. This dataset is composed of a recently reprocessed 3D seismic survey and eight wells that encountered hydrocarbons. To identify leads and their potential fluid fill, well log analysis was undertaken to determine rock and fluid parameters. The processed well logs were interpreted using sequence stratigraphic methodology and calibrated with biostratigraphic data to identify regionally correlatable sequence boundaries and assign depositional environments resulting in six regionally extensive mapped horizons.

Quantitative seismic interpretation was undertaken on pre-stack seismic data with an aim to predict lithology and fluid content away from the wellbores. Pre-stack seismic inversion was performed to produce elastic properties - relative and absolute acoustic impedance (ip), shear impedance (Is) and P-wave to S-wave velocity ratio (Vp/Vs). Rock physics analysis and fluid response modelling (through the Gassman fluid substitution equation) has been performed in the wells to appreciate the elastic responses to changes of fluid type and to be able to relate it to any seismic elastic attributes responses within the identified seismic leads. The analysis shows that an elastic response for hydrocarbon sands is separable from a brine sand response and shale response, leading to the possibility of mapping hydrocarbon sand anomalies by interpreting on pre-stack seismic and elastic attributes combined.

The key elements of a working petroleum system are proven to occur within the study area from the available well data. A number of undrilled leads with similar geological and structural characteristics to known discoveries have been identified & evaluated. In some of the structural leads there is the potential for the occurrence of stacked reservoirs, which could provide enhanced hydrocarbon trapping opportunities.

http://library.seg.org/doi/abs/10.1190/ice2016-6336340.1
Keywords: 3D