Characteristics of solid residue, expelled and retained hydrocarbons of lacustrine marlstone based on semi-closed system hydrous pyrolysis: Implications for tight oil exploration

Characteristics of solid residue, expelled and retained hydrocarbons of lacustrine marlstone... The Paleogene lacustrine marlstone is an important source rock for giant oil fields found in Eastern China, which presently has become a main exploration target for tight oil resources. However, seldom studies have been conducted on possible variations in geochemical features of lacustrine marlstones during on-going burial process as well as the thermal evolution. Hydrous pyrolysis experiments were performed using organic-rich thermally immature marlstone samples from the Shulu Sag, Bohai Bay Basin, in order to have a better understanding in the formation process and accumulation mechanism for tight oil retained within the source rock. Laboratorial data of samples including solid residues, retained hydrocarbon (extracted bitumen) and expelled hydrocarbons were analyzed. The results indicate that quantity and composition of retained hydrocarbon are controlled by thermal maturity of the source rocks. Mass balance of organic matter provides a clue for recovering the amount of gaseous/light hydrocarbon retained in the solid residues. The formation and accumulation of tight oil mostly takes place in the oil window–wet gas window, which consists of four stages: (1) In the thermal maturity range of 0.5–0.8% Ro, the amount of retained and expelled hydrocarbons appears to increase synchronously; (2) At 0.8–1.0% Ro, the retained hydrocarbons reach maximum amount while the expelled hydrocarbons keep constant; and the gas to oil ratio of retained hydrocarbon (GORR) in the above two stages keeps at a low level; (3) Over the maturity of 1.0–1.1% Ro, the amount of retained hydrocarbons decreases while expelled hydrocarbons increases, during which GORR increases significantly and retained hydrocarbons characterized by more lighter hydrocarbon composition; (4) At about 1.3–1.5% Ro the amount of retained hydrocarbons is less than that of expelled hydrocarbons. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fuel Elsevier

Characteristics of solid residue, expelled and retained hydrocarbons of lacustrine marlstone based on semi-closed system hydrous pyrolysis: Implications for tight oil exploration

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Publisher
Elsevier
Copyright
Copyright © 2015 Elsevier Ltd
ISSN
0016-2361
D.O.I.
10.1016/j.fuel.2015.09.009
Publisher site
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Abstract

The Paleogene lacustrine marlstone is an important source rock for giant oil fields found in Eastern China, which presently has become a main exploration target for tight oil resources. However, seldom studies have been conducted on possible variations in geochemical features of lacustrine marlstones during on-going burial process as well as the thermal evolution. Hydrous pyrolysis experiments were performed using organic-rich thermally immature marlstone samples from the Shulu Sag, Bohai Bay Basin, in order to have a better understanding in the formation process and accumulation mechanism for tight oil retained within the source rock. Laboratorial data of samples including solid residues, retained hydrocarbon (extracted bitumen) and expelled hydrocarbons were analyzed. The results indicate that quantity and composition of retained hydrocarbon are controlled by thermal maturity of the source rocks. Mass balance of organic matter provides a clue for recovering the amount of gaseous/light hydrocarbon retained in the solid residues. The formation and accumulation of tight oil mostly takes place in the oil window–wet gas window, which consists of four stages: (1) In the thermal maturity range of 0.5–0.8% Ro, the amount of retained and expelled hydrocarbons appears to increase synchronously; (2) At 0.8–1.0% Ro, the retained hydrocarbons reach maximum amount while the expelled hydrocarbons keep constant; and the gas to oil ratio of retained hydrocarbon (GORR) in the above two stages keeps at a low level; (3) Over the maturity of 1.0–1.1% Ro, the amount of retained hydrocarbons decreases while expelled hydrocarbons increases, during which GORR increases significantly and retained hydrocarbons characterized by more lighter hydrocarbon composition; (4) At about 1.3–1.5% Ro the amount of retained hydrocarbons is less than that of expelled hydrocarbons.

Journal

FuelElsevier

Published: Dec 15, 2015

References

  • Geochemical evolution of organic-rich shales with increasing maturity: a STXM and TEM study of the Posidonia Shale (Lower Toarcian, Northern Germany)
    Bernard, S.; Horsfield, B.; Schulz, H.M.; Wirth, R.; Schreiber, A.; Sherwood, N.
  • Geochemical characterization of solid residues, bitumen and expelled oil based on steam pyrolysis experiments from Irati oil shale, Brazil: a preliminary study
    Franco, N.; Kalkreuth, W.; Peralba, M.D.R.
  • Evaluating transition-metal catalysis in gas generation from the Permian Kupferschiefer by hydrous pyrolysis
    Lewan, M.D.; Kotarba, M.J.; Wieclaw, D.; Piestrzynski, A.
  • Organic geochemistry and reservoir characterization of the organic matter-rich calcilutite in the Shulu Sag, Bohai Bay Basin, North China
    Zhao, X.; Li, Q.; Jiang, Z.; Zhang, R.; Li, H.
  • Source-controlled carbonates in a small Eocene half-graben lake basin (Shulu Sag) in central Hebei Province, North China
    Jiang, Z.X.; Chen, D.Z.; Qiu, L.W.; Liang, H.B.; Ma, J.
  • The generation and expulsion of gases in Ya131 gas field, South China Sea: implication of laboratory pyrolysis results
    Geng, A.S.; Zhou, Y.; Fu, J.M.; Sheng, G.Y.; Zhang, Q.M.
  • Experiments on the role of water in petroleum formation
    Lewan, M.D.
  • Practical kinetic modeling of petroleum generation and expulsion
    Stainforth, J.G.

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