FAULT SEAL ANALYSIS OF RESERVOIR ROCKS IN NIGER DELTA: A CASE STUDY OF 'AB' FIELD

Chukwuebuka Ukwu, K. Bobmanuel Scent

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Faults play very important roles in hydrocarbon trapping systems. Fault Seals have a primary control on the trap in many hydrocarbon reservoirs, and also divide a large hydrocarbon reservoir into compartments. Faults seal when: reservoir sands juxtapose a low permeable rock such as shale with a high entry pressure, and/or when preferential cementation along an originally permeable rock occurs in which porosity is partially or totally removed leading to a hydraulic seal. Two types of lithology dependent attributes are defined: shale gouge ratio and clay smear factor. Cross fault flow resistance controls were determined by capillary membrane pressure, and rate controlled Darcy flow. Structural interpretation of seismic data and well log data incorporation was used to build a stratigraphic model with volume of clay values juxtaposed across the modelled faults in order to evaluate juxtapositions. From clay content we defined fault rock properties by calibrating in-situ measurements from the trend curves thereby obtaining the permeability and capillary threshold pressure. Hydrocarbon height prediction and shale gouge ratio calculations showed that the spatial sealing characteristics of a single fault are likely to be heterogeneous with sand levels greater than the threshold value of 20% for Niger Delta reservoir rocks.

Original languageEnglish
Title of host publication83rd EAGE Conference and Exhibition June 2022
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Pages3245-3249
Number of pages5
Volume5
ISBN (Electronic)9781713859314
DOIs
Publication statusPublished - 6 Jun 2022
Externally publishedYes
Event83rd EAGE Conference and Exhibition 2022 - Madrid, Virtual, Spain
Duration: 6 Jun 20229 Jun 2022

Publication series

Name83rd EAGE Conference and Exhibition 2022
Volume5

Conference

Conference83rd EAGE Conference and Exhibition 2022
Country/TerritorySpain
CityMadrid, Virtual
Period6/06/229/06/22

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