The kerogen types and pyrolysis kinetics of several Chinese carbonate source rocks

Conference · Wed Jan 01 00:00:00 EST 1992 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:5696385

Zhang, Youcheng ^[1]; Hao, Shisheng ^[2]

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1. Texas A and M Univ., College Station, TX (United States). Dept. of Oceanography
2. Petroleum Univ., Beijing (China). Dept. of Geosciences

The kerogen types and pyrolysis kinetics of several Chinese carbonate source rocks are studied in this paper. Samples involved are from Proterozoic to Neogene, including marine and lacustrine environments. Their TOC range from 0.15% to 1.69%. The carbonate contents are more than 80% except the Paleozoic Pingliang marl, Shanganning Basin. The maturations range from immature to late stage of oil generation. The Green River calcareous shale and Ghareb marl, Jordan are included for comparison. The study of kerogen types is based on analyses of kerogens including: optical method, elemental analysis, infrared spectrum, rock eval pyrolysis, pyrolysis-gas chromatography, and C-13 Nuclear Magnetic Resonance Spectrometry. The results of the study shows that most of the kerogens studied belong to type 1 or sapropelic type 2 (2a), while the kerogens from Triassic Qinglong limestone (restricted by), Jiangsu and Neogene Guantao limestone (small fault lacustrine), Shandong belong to mixed type 2 (2b). The study of pyrolysis kinetics is based on standard Rock Eval information (5 C/min.), a two-stage first order reaction model and optimization method which has been confirmed to be a simple, practical and effective method by a previous study. The current study reveals that different kerogen types have their own kinetic characteristics. Generally, kinetics parameters of type 1 and type 2a kerogens are greater than those of type 2b. However, high-sulfur type 1 and type 2a kerogens, such as those from Ghareb marl, Jordan, and Proterozoic kerogen, North China have relatively low kinetics parameters. The study also shows that kerogens with similar hydrocarbon potential (HI) and elemental composition (atomic H/C, O/C) may have very different kinetic processes.

• OSTI ID: 5696385
• Report Number(s): CONF-921058-; CODEN: GAAPBC
• Journal Information: Geological Society of America, Abstracts with Programs; (United States), Vol. 24:7; Conference: 1992 annual meeting of the Geological Society of America (GSA), Cincinnati, OH (United States), 26-29 Oct 1992; ISSN 0016-7592
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
04 OIL SHALES AND TAR SANDS
KEROGEN
CLASSIFICATION
SOURCE ROCKS
PYROLYSIS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHINA
MATURATION
SEDIMENTARY BASINS
ASIA
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DECOMPOSITION
GEOLOGIC STRUCTURES
KINETICS
MATERIALS
MATTER
ORGANIC MATTER
REACTION KINETICS
THERMOCHEMICAL PROCESSES
023000* - Petroleum- Properties & Composition
040500 - Oil Shales & Tar Sands- Properties & Composition