A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa

Simple item page
dc.contributor.advisorSmith, Georgeen_ZA
dc.contributor.authorEl Saadi, Omaren_ZA
dc.date.accessioned2015-12-02T12:04:03Z
dc.date.available2015-12-02T12:04:03Z
dc.date.issued2015en_ZA
dc.description.abstractGeological 3D static modelling has become an integral tool during the appraisal and developmental stages of a hydrocarbon field lifecycle. The 3D model becomes the basis upon which reservoir heterogeneity and characterisation are understood, hydrocarbon volumetrics are calculated and field development plans are designed. Reservoir compartmentalisation and fault-seal analysis is also an industry topic which has drawn much interest. Having a 3D model allows for fault-seal analyses to be carried out and evaluated using the statistically distributed reservoir properties. This study incorporates the building of a 3D geo-cellular reservoir model with a fault seal analysis of the E-S field, which is located on the north flank of the Bredasdorp Basin. The reservoir model was built using geostatistical methods to populate the several reservoir parameters into the model to calculate a hydrocarbon volume. In addition, a fault-seal analysis was carried out in order to investigate the phenomenon of having an oil accumulation separated from a gas accumulation either side of a fault. The facies modelling was carried out using the object modelling technique, in order to produce a model which is geologically plausible. Most of the remaining reservoir parameters were modelled using a variogram except in the case of water saturation, which was modelled using a J function equation. The volumetrics were assigned per fault block. Using a recovery factor of 75% for gas and 11% for oil, the calculated total recoverable hydrocarbons were 12.6 Bscf and 1.3 MMbbl respectively. The fault-seal analysis showed that the faults separating two of the fault blocks are not completely sealing. All the calculated fault properties supported this view, with the Shale Gouge Ratio (SGR) and threshold pressure relationship indicating a high likelihood for leakage across parts the faults. Pressure data from Repeat Formation Tests (RFT) however, indicates that the hydrocarbon accumulations in both blocks are isolated from each other. This contradiction has informed the recommendation to drill a highly deviated or short horizontal well which will cross the fault and intersect both blocks, and to complete the well using a sliding sleeve, thus providing the flexibility needed in order to manage multi-phase flow.en_ZA
dc.identifier.apacitationEl Saadi, O. (2015). <i>A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/15513en_ZA
dc.identifier.chicagocitationEl Saadi, Omar. <i>"A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2015. http://hdl.handle.net/11427/15513en_ZA
dc.identifier.citationEl Saadi, O. 2015. A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - El Saadi, Omar AB - Geological 3D static modelling has become an integral tool during the appraisal and developmental stages of a hydrocarbon field lifecycle. The 3D model becomes the basis upon which reservoir heterogeneity and characterisation are understood, hydrocarbon volumetrics are calculated and field development plans are designed. Reservoir compartmentalisation and fault-seal analysis is also an industry topic which has drawn much interest. Having a 3D model allows for fault-seal analyses to be carried out and evaluated using the statistically distributed reservoir properties. This study incorporates the building of a 3D geo-cellular reservoir model with a fault seal analysis of the E-S field, which is located on the north flank of the Bredasdorp Basin. The reservoir model was built using geostatistical methods to populate the several reservoir parameters into the model to calculate a hydrocarbon volume. In addition, a fault-seal analysis was carried out in order to investigate the phenomenon of having an oil accumulation separated from a gas accumulation either side of a fault. The facies modelling was carried out using the object modelling technique, in order to produce a model which is geologically plausible. Most of the remaining reservoir parameters were modelled using a variogram except in the case of water saturation, which was modelled using a J function equation. The volumetrics were assigned per fault block. Using a recovery factor of 75% for gas and 11% for oil, the calculated total recoverable hydrocarbons were 12.6 Bscf and 1.3 MMbbl respectively. The fault-seal analysis showed that the faults separating two of the fault blocks are not completely sealing. All the calculated fault properties supported this view, with the Shale Gouge Ratio (SGR) and threshold pressure relationship indicating a high likelihood for leakage across parts the faults. Pressure data from Repeat Formation Tests (RFT) however, indicates that the hydrocarbon accumulations in both blocks are isolated from each other. This contradiction has informed the recommendation to drill a highly deviated or short horizontal well which will cross the fault and intersect both blocks, and to complete the well using a sliding sleeve, thus providing the flexibility needed in order to manage multi-phase flow. DA - 2015 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 T1 - A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa TI - A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa UR - http://hdl.handle.net/11427/15513 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/15513
dc.identifier.vancouvercitationEl Saadi O. A geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2015 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/15513en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Geological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherGeological Sciencesen_ZA
dc.titleA geo-cellular model of a multiphase hydrocarbon field incorporating fault-seal analysis : Bredasdorp Basin, South Africaen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
thesis_sci_2015_el_saadi_omar.pdf
Size:
7.55 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Masters