First lithological and organic geochemical characterization of organic rich mudstones from Shavar Formation, southeast Bulgaria. Issue 1 (31st March 2022)

• Record Type: Journal Article
• Authors: Zdravkov, Alexander; Ajdanlijsky, George; Stefanova, Maya; Groß, Doris; Dintchev, Yaroslav
• Is Part Of: Energy sources. Volume 44:Issue 1(2022)
• Page Start: 2331
• Page End: 2344
• Publication Date: 2022-03-31
• Subjects: Shavar Formation -- SE Bulgaria -- mudstones -- biomarkers -- hydrocarbon potential; Natural resources -- Periodicals; Energy consumption -- Periodicals; Energy consumption -- Climatic factors -- Periodicals; Energy conversion -- Periodicals; Energy conversion -- Environment aspects -- Periodicals; Power (Mechanics) -- Periodicals; 333.7905
• DOI: 10.1080/15567036.2019.1649749
• Languages: English
• ISSNs: 1556-7036

Abstract

ABSTRACT: The paper reports the first results of the organic geochemical characterization of mudstones from the Shavar Fm (eastern Rhodope Mt., Bulgaria). The rock matrix is unevenly impregnated by amorphous organic matter at the onset of the oil generation (Tmax ~ 445ºC; PI – 0.1–0.2). High total organic carbon contents (avg. TOC – 5.9 wt. %) and HI (~720 mg HC/g TOC) argue for oil-prone source-rocks with very good hydrocarbon potential. The n -alkane distributions with maxima in the range n -C20-25 are consistent with organic matter origin from submerged plants. Additionally, sterane distributions dominated by C28-30 4-methyl steranes, indicate dinoflagellate contribution. High pristane/phytane ratio (Pr/Ph = 2–4) argue for deposition under oxic conditions.