--> Abstract: The Impact of Fault-Zone Materials from Hydrocarbon Accumulation: From Outcrop Analogue from Southeastern Nigeria, by Olugbenga A. Ehinola and Adeboye S. Adeyemi; #90082 (2008)
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The Impact of Previous HitFaultNext Hit-Zone Materials from Hydrocarbon Accumulation: From Outcrop Analogue from Southeastern Nigeria

Olugbenga A. Ehinola1 and Adeboye S. Adeyemi2
1Geology, University of Ibadan, Ibadan, Nigeria
2OTG-W Dept., Mobil Producing Nigeria Unlimited, Lagos, Nigeria

The contrasting capacity of faults to act as seal in some cases, and to serve as migration conduit in others, has been the subject of numerous researches, especially in the oil industry. However, a lot of previous work on the impact of these faults to hydrocarbon accumulation and production has mostly addressed Previous HitfaultNext Hit juxtaposition, rather than the properties of Previous HitfaultNext Hit zone materials, as the sealing mechanism.

The aim of this study is to analyse the relative impact of Previous HitfaultNext Hit gouge materials and Previous HitfaultNext Hit juxtaposition as sealing mechanism, and to develop a method to predict fluid transmissibility and / or containment by Previous HitfaultNext Hit zone materials, using outcrop dataset obtained from southeastern Nigeria. In addition to field mapping and detailed description of Previous HitfaultNext Hit zone and juxtaposed materials at the outcrop, integrated modeling of Previous HitfaultNext Hit surface and elevation data and estimation of the permeability of the studied Previous HitfaultNext Hit using GXII and Shale Gouge Ratio respectively were adopted. To minimize the limitation of the lack of good 3D seismic, pressure and production data, analogous data from other locations of similar geologic settings are incorporated.

The result shows that four different scenarios were possible in the study area and these include: sand-sand, sand-shale, shale-sand and shale-shale relationships across the faults. The attribute from each of these lithologic pairs was integrated with the properties of the Previous HitfaultNext Hit zone materials to develop a relative impact-matrix for ranking the different scenarios. It can be deduced that both the nature of materials juxtaposed across a Previous HitfaultNext Hit and the character of materials in the Previous HitfaultNext Hit zone play significant, and complementary roles in fluid control across a Previous HitfaultNext Hit. This suggests that field study approach can be adopted in investigating the impact of Previous HitfaultTop zone materials.

AAPG International Conference and Exhibition, Cape Town, South Africa 2008 © AAPG Search and Discovery