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Hydrocarbon potential of shale and classification and evaluation criteria of shale oil from the Williston Basin
Author(s) -
LI Qian,
LU Shuangfang,
LI Wenhao,
HU Ying,
ZHANG Han,
ZHANG Pengfei
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12303_21
Subject(s) - oil shale , geology , petroleum engineering , structural basin , shale oil , shale gas , oil shale gas , hydrocarbon , geochemistry , mining engineering , paleontology , chemistry , organic chemistry
The Williston Basin is one of the most successful basins in exploration and development of shale oil and gas in North America with abundant logging and geochemical data. A total of three chief source rocks are respectively developed in the Ordovician, the Devonian-Lower Carboniferous and the Cretaceous. In this paper, these three sets of source rocks are evaluated and compared separately from the abundance, type and maturity of organic matter, based on massive geochemical data. The results show that source rock in the Bakken formation has maximum abundance of organic matter with type II kerogen mainly in the oil generation stage of maturity and provides the excellent material basis for shale oil enrichment. But the former did not conduct in-depth research on the quantitative resource evaluation of the Upper and Lower Bakken Formation. After making statistic analysis of the geochemical index of hydrocarbon source rock layers in five areas such as Songliao, Hailaer, Jiyang, Lu et al.(2012) found that when source rocks was buried deep with high maturity, the oil content of the source rocks (S1 and chloroform bitumen "A") with increasing TOC showed significant three sections features, which can be classified into three levels in terms of enrichment degree, that is, dispersed resources, less efficient resources and enriched resources. * In this article, based on the investigation and research on the Ordovician, Devonian-Lower Carboniferous and Cretaceous source rocks system of the Williston Basin, we compare their hydrocarbon potential and try to establish evaluation criteria of shale oil for Bakken Formation. Finally, we evaluate organic matter abundance of the Bakken Shale on account of the improved ΔlogR model. And combined with the evaluation criteria, we discuss the shale oil resource potential of the Upper and Lower Bakken Formation. 2 Hydrocarbon Potential Evaluation of the Source Rocks in the Williston Basin