Geochemistry, Diagenesis and Secondary Porosity Development of Late Jurassic-strata, Offshore Newfoundland, Canada

Gordon, John Borthwick

Geochemistry, Diagenesis and Secondary Porosity Development of Late Jurassic-strata, Offshore Newfoundland, Canada

dc.contributor.advisor	Pedersen, Per
dc.contributor.advisor	Sanei, Hamed
dc.contributor.author	Gordon, John Borthwick
dc.contributor.committeemember	Ardakani, Omid
dc.contributor.committeemember	Ghanizadeh, Amin
dc.date	2022-02
dc.date.accessioned	2021-12-16T15:44:31Z
dc.date.available	2021-12-16T15:44:31Z
dc.date.issued	2021-12-15
dc.description.abstract	Hydrocarbon prospectively in siliciclastic reservoirs is dependant on many attributes. Two key factors are: (i) a complete understanding of the geochemical character of source rock organic matter (OM) and (ii) assessing reservoir quality of the reservoir rocks. These two key factors are the primary focus of the research completed in this thesis. In this thesis OM types and distribution, the hydrocarbon potential, thermal maturity of source rock intervals, and the diagenetic mechanisms that control anomalously high secondary porosity in sandstone reservoir intervals from Jurassic-aged, Late-Tithonian strata of the Central Ridge and Flemish Pass Basin, offshore Newfoundland, Canada are studied. This thesis comprises an integration of petrographic analysis, geochemical programmed pyrolysis, organic petrology, and machine learning algorithms from samples taken from cores, side wall cores (SWC), and drill cuttings that intersect the Kimmeridgian-aged to Tithonian-aged sandstones, siltstones, and mudstones of the Central Ridge and Flemish Pass Basin. The sandstone intervals in this area have well preserved anomalously high secondary porosity (>25%) in relative deeply buried (2-3 km) reservoirs. The deltaic sediments that envelop the sandstone bodies have OM-rich and/or OM-lean zones that are largely controlled by depositional environment. Applying a novel machine learning algorithm (Random Forest Analysis) highlights the high hydrocarbon potential zones with a high level of accuracy using wireline log data. A paragenetic sequence was constructed to understand the diagenetic events that control porosity development in the sandstone reservoirs and the relationship to the source rock intervals. Here the model was tested that the high secondary porosity development is caused by dissolution of carbonate cement by short-chained carboxylic acid (SCCA) generation during thermal maturation of OM in the bounding deltaic sediments and the interlaminated OM in the sandstone reservoirs.	en_US
dc.identifier.citation	Gordon, J. B. (2021). Geochemistry, Diagenesis and Secondary Porosity Development of Late Jurassic-strata, Offshore Newfoundland, Canada (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.	en_US
dc.identifier.doi	http://dx.doi.org/10.11575/PRISM/39425
dc.identifier.uri	http://hdl.handle.net/1880/114179
dc.language.iso	eng	en_US
dc.publisher.faculty	Science	en_US
dc.publisher.institution	University of Calgary	en
dc.rights	University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.	en_US
dc.subject	Petrography	en_US
dc.subject	Geochemistry	en_US
dc.subject	Organic Petrology	en_US
dc.subject.classification	Education--Sciences	en_US
dc.subject.classification	Geochemistry	en_US
dc.subject.classification	Geology	en_US
dc.title	Geochemistry, Diagenesis and Secondary Porosity Development of Late Jurassic-strata, Offshore Newfoundland, Canada	en_US
dc.type	doctoral thesis	en_US
thesis.degree.discipline	Geoscience	en_US
thesis.degree.grantor	University of Calgary	en_US
thesis.degree.name	Doctor of Philosophy (PhD)	en_US
ucalgary.item.requestcopy	true	en_US