Petrorevol (Petroleum Reservoir Volcanics, Working Group), Jilin University, the largest university and among the best in China
 | College of Earth Sciences, Jilin University
Jianshe Str.2199 (Pigeon Building) 130061，Changchun Jilin Province in northeast China Geographic coordinate: N 43°52’43.35”, E125°17’26.28” Elevation: 254 m Office Telephone/Fax: 0086-431-88502620 |
"Volcanic Reservoirs and their Exploration" Working Group:
The working group has focused on volcanic reservoirs and their exploration in China since 1994. Composed of both geologists of 14 professional staff and geophysists of 4 professors as well as many other PhD/Ms/Bachelor students, the working group has carried out many research projects succesfully on volcanic reservoirs related to nearly all the main petroliferous basins in China including the Songliao Basin, Liaohe/Bohaibay Basin, Junggar Basin, as well as East China Sea and South China Sea Basins. With the materials and experience above, they have put forward systematic principles and techniques on the volcanic reservoirs and their exploration, which have much improved the wildcat success rate from less than 15% to ca. 50%.
Volcanic reservoirs are strongly anisotropic concerning reservoir features. Exploration tactics may greatly vary for different basins. For the Songliao Basin (SB), for example, we proposed that the practical exploration procedures used to discover effective volcanic reservoirs include mapping of volcanic provinces within the basin, delineating different types of paleovolcanoes, searching for and selecting composite paleovolcanoes by drilling on volcanic highs, and choosing reservoir units with the best porosity and permeability. Additionally, the reservoirs must be close to petroleum source rock. Three critical depths should be taken into account in the exploration process for petroleum in the SB. At burial depths shallower than 2000 m (6562 ft), sedimentary rocks (sandstones and conglomerates) are the preferred targets because of their higher porosity and permeability. Below 3000 m (9843 ft) depth, lavas and welded ignimbrites are the best reservoirs because of their strong resistance to overburden pressure. Between 2000 and 3000 m (6562 and 9843 ft), both sedimentary and volcanic rocks may be considered as target reservoirs. The reservoir performance of pyroclastic rocks is similar to that of sedimentary rocks with respect to porosity-depth relationships.
Comparison between paleo-buried volcanoes and modern volcanoes like Changbaishan-Tianchi volcanoes :
Past is the key to the present and vice versa. The working group have gotten great benefit and success in the comparison studies between the exposed and buried volcanoes. The exposed outcrops can show us details of the concerned volcanological aspects directly, while the buried ones can be observed in 3-dementions and with different scales based on borehole, well-logging, and seismic data. The similarities and differences between them can provide us with valuable information about evolutionary history on construction, destruction and buried/diagenesis process of the volcanoes, which have much improved our knowledge on both ancient and modern volcanoes for a wide aspects, such as, volcanostratigraphy, volcanic arthitecture, volcanic facies, paleo-volcanic landscape, and distribution pattern of volcanic reservoir parameters.
Research Interests of the working group:
(1) Petroliferous Sedimentary Basins；
(2) Volcanic Reservoirs；
(3) ICDP Drilling Program in the Songliao Basin (Pu-Jun Wang is the geologist-in-chief of the program)；
(4) Volcanology of Changbaishan Volcanoes (volcanostratigraphy and volcanic architecture, volcanic hazard)
Study Areas in recent years: Songliao Basin, Liaohe/Bohaibay Basin, Junggar Basin; Chabaishan Volcanoes; East/South China Sea Basins.
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