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TitleS1 peak of Rock-Eval analysis: What does it represent for unconventional hydrocarbon resource assessment?
AuthorJiang, C; Mort, A; Sanei, H; Chen, Z; Milovic, M; Robinson, R
SourceCanadian Society of Petroleum Geologists, Canadian Society of Exploration Geophysicists, Joint Annual Meeting, Abstracts 2015, 2015 p. 1-4
Alt SeriesEarth Sciences Sector, Contribution Series 20140403
MeetingCSPG GeoConvention 2015; Calgary; CA; May 4-8, 2015
Mediapaper; on-line; digital
File formatpdf
Subjectsfossil fuels; hydrocarbons; hydrocarbon potential; Rock-Eval analyses
ProgramShale Reservoir Characterization, Geoscience for New Energy Supply (GNES)
LinksOnline - En ligne (PDF 4 MB)
AbstractCapable of generating a suite of parameters (i.e. S 1 , S 2 , TOC, Tmax, HI and OI) from a single analysis to provide information on sedimentary organic matter richness, type and thermal maturity of a rock sample, Rock - Eval pyrolysis has probably been the most widely used analytical technique for assessing the quality and quantity of petroleum hydrocarbons associated with shale source rocks and tight reservoirs. However, the effectiveness of these apparently meaningful parameters can be affected by several factors such as sample contamination from drilling mud, sample storage and preparation as well the nature of the sample itself, which has not been made aware to many geologists and needs detailed investigation. For example, despite routine use of the Rock - Eval S 1 peak to estimate the amount of free liquid hydrocarbons present in the rock systems (Peters, 1986; Jarvie 2012), what S 1 represents chemically for particular shale or tight reservoir sample s and how it is affected by the sample condition are not clear to many geologists and engineers . This study especially focuses on the effect s of sample storage, preparation and contamination on the S 1 peak.
Summary(Plain Language Summary, not published)
This study is on the application of a thermal analysis technique to characterize shale hydrocarbons. Rock-Eval pyrolysis, a technique widely used in the oil and gas industry, can only produce a value (S1 peak) of the total amount of hydrocarbons that can be released from a rock sample upon heat treatment. The TD-GC-MS/FID method presented in this study can tell the molecular composition of the hydrocarbons, and thus can help petroleum geologists and engineers to identify whether there is external contamination to the core samples or if there has been any evaporative loss of volatile hydrocarbons occurring to the rock samples. Based on this information geologists and engineers can decide if and how much a calibration is needed when the S1 peak is used for hydrocarbon resource assessment.