| Title | Shale oil resource potential and oil mobility characteristics of the Eocene-Oligocene Shahejie Formation, Jiyang Super-Depression, Bohai Bay Basin of China |
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| Author | Li, M ; Chen, Z; Ma, X; Cao, T; Qian, M; Jiang, Q; Tao, G; Li, Z; Song, G |
| Source | International Journal of Coal Geology vol. 204, 2019 p. 130-143, https://doi.org/10.1016/j.coal.2019.01.013 |
| Image |  |
| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20180392 |
| Publisher | Elsevier BV |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html |
| Area | China |
| Lat/Long WENS | 115.0000 118.0000 38.0000 36.0000 |
| Subjects | fossil fuels; geochemistry; geophysics; Paleogene; Eocene; Oligocene; petroleum resources; hydrocarbon potential; hydrocarbons; oil; bedrock geology; lithology; sedimentary rocks; oil shales; host
rocks; source rocks; core samples; organic geochemistry; pyrolysis; whole rock analyses; hydrogen index; organic carbon; models; exploration wells; porosity; temperature; hydrocarbon generation; geophysical logging; Shahejie Formation; Jiyang
Super-Depression; Bohai Bay Basin; Methodology; Resource development; Phanerozoic; Cenozoic; Tertiary |
| Illustrations | location maps; geoscientific sketch maps; cross-sections; plots; tables; profiles; models; well logs |
| Program | Geoscience for New Energy Supply (GNES) Shale-hosted petroleum resource assessment |
| Released | 2019 02 23 |
| Abstract | Oil mobility in liquid-rich shale is crucial for economic success of resource development. The characteristics of the host rock and the properties of oil fluids are two primary factors controlling fluid
mobility. Organic geochemistry data allows examination of both resource potential and oil mobility. We propose data-driven empirical models in this paper to describe hydrocarbon resource potential with respect to oil mobility. The proposed methods
were applied to a dataset collected from the Eocene-Oligocene Es3 and Es4 source rock units in four recent shale oil exploration wells in the Jiyang Super-Depression of the Bohai Bay Basin. The dataset, results from standard programmed pyrolysis of
whole rock samples as well as solvent extracted replicates of 139 core samples, was studied to examine the source rock characteristics and shale oil resource potential. Bulk geochemical characteristics and thermal decomposition trends allow for
sub-division of the samples into two groups; a) samples with high initial hydrogen index (> 800 mg HC/g TOC) and average present day TOC of 4.07% from LY1 and NY1 wells in a distal facies; and b) samples with slightly lower initial hydrogen index
(about 700 mg HC/g TOC) and average TOC of 3.11% from FY1 and L69 wells in a transitional facies. Three different categories of oil resource with respect to oil mobility can be defined: adsorbed, restricted and movable based on organic geochemical
characteristics and their variations in the stratigraphic intervals represented by the samples in the four wells. We show that expulsion efficiency is a good indicator of hydrocarbon retention in source rock reservoir and that the two wells in the
distal facies have higher total resource potentials with abundant movable oil resource than the two wells in the transitional facies. The total oil potential is separated into three types of oil resource to show oil mobility, thus providing more
information for business decision. |
| Summary | (Plain Language Summary, not published)
Oil mobility in shale play is crucial for economic success of resource development. The character of host rock and properties of the oil are two primary
factors controlling oil mobility. Organic geochemistry data contain information on oil mobility. We propose data-driven models to describe resource potential with respect to oil mobility. A dataset from Rock-Eval pyrolysis of whole rock and solvent
extracted replicates of 139 samples was studied to examine the source rock characteristics and oil mobility. Three types of oil resource were recognized: adsorbed, restricted and movable based on organic geochemical characteristics. The study show
that petroleum expulsion efficiency is a good indicator of hydrocarbon retention. High in oil retention means large in-place resource, but may not guaranty more extractable. Evaluating oil resource potential with respect to oil mobility provides more
information for resource development decision. |
| GEOSCAN ID | 313616 |
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