Organic Matter and Elemental Composition of Mudstones in the Member 3 of Paleogene Shahejie Formation in the Dongying Depression, Eastern China
Affiliation(s)
1 State Key Laboratory of Petroleum Resources and Prospecting, Faculty of Natural Resources and Information Technology, China University of Petroleum, Beijing, China. 2 School of Geoscience, China University of Petroleum, Qingdao, China. 3 Geological Scientific Research Institute, Shengli Oilfield Company, SINOPEC, Dongying, China.
1 State Key Laboratory of Petroleum Resources and Prospecting, Faculty of Natural Resources and Information Technology, China University of Petroleum, Beijing, China. 2 School of Geoscience, China University of Petroleum, Qingdao, China. 3 Geological Scientific Research Institute, Shengli Oilfield Company, SINOPEC, Dongying, China.
ABSTRACT
The organic matter distribution and hydrocarbon generation potential as well as element distribution in the lacustrine mudstones of lower Member 3 of Paleogene Shahejie Formation in the Dongying depression, eastern China were investigated using methods of Rock-Eval pyrolysis, inductively coupled plasma emission spectrometer. The results show that most of the samples are high-quality source rocks with high TOC and S2, and the oil shale samples are excellent source rocks with the TOC and S2 greater than 5.0% and 20.0 mg/g, respectively. A freshwater depositional environment in the deep lake for the mudstones was indicated by lower values of biomarker ratios gammacerane/C30 Hopane and C35Hopane/C34 Hopane. With the lacustrine regression, the ratios Ca/U, Ca/Ba, Ca/Mg, Ca/B, Ca/Li, Ca/Sr and Sr/Ba decrease, while Fe/(Ca + Mg) increases. In the section 3330 - 3370 m with enrichment of oil shale, the organic matter and inorganic elements present strong fluctuation. The quantitative relations among U, U/Th and TOC, S2, %Ca are divided into two parts at boundary values of 7.0%, 32 mg/g and 11% for TOC, S2 and %Ca, respectively.
The organic matter distribution and hydrocarbon generation potential as well as element distribution in the lacustrine mudstones of lower Member 3 of Paleogene Shahejie Formation in the Dongying depression, eastern China were investigated using methods of Rock-Eval pyrolysis, inductively coupled plasma emission spectrometer. The results show that most of the samples are high-quality source rocks with high TOC and S2, and the oil shale samples are excellent source rocks with the TOC and S2 greater than 5.0% and 20.0 mg/g, respectively. A freshwater depositional environment in the deep lake for the mudstones was indicated by lower values of biomarker ratios gammacerane/C30 Hopane and C35Hopane/C34 Hopane. With the lacustrine regression, the ratios Ca/U, Ca/Ba, Ca/Mg, Ca/B, Ca/Li, Ca/Sr and Sr/Ba decrease, while Fe/(Ca + Mg) increases. In the section 3330 - 3370 m with enrichment of oil shale, the organic matter and inorganic elements present strong fluctuation. The quantitative relations among U, U/Th and TOC, S2, %Ca are divided into two parts at boundary values of 7.0%, 32 mg/g and 11% for TOC, S2 and %Ca, respectively.
Cite this paper
Chen, Z. , Liu, Q. , Zhang, S. and Jiang, C. (2015) Organic Matter and Elemental Composition of Mudstones in the Member 3 of Paleogene Shahejie Formation in the Dongying Depression, Eastern China. International Journal of Geosciences, 6, 537-548. doi: 10.4236/ijg.2015.66042.
Chen, Z. , Liu, Q. , Zhang, S. and Jiang, C. (2015) Organic Matter and Elemental Composition of Mudstones in the Member 3 of Paleogene Shahejie Formation in the Dongying Depression, Eastern China. International Journal of Geosciences, 6, 537-548. doi: 10.4236/ijg.2015.66042.
References
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[1] Chen, Z.H. and Zha, M. (2006) Sedimentary Characteristics of Source Rocks in Fluctuation from Lake Facies: An Example from Dongying Depression, China. Journal of Lake Science, 18, 29-35. [2] Chen, Z.H. and Zha, M. (2008) Mechanism of Overpressured Fluid Compartment and Its Controlling on Hydrocarbon Migration and Accumulation in Faulted Lacustrine Basin: A Case Study from the Dongying Sag, Bohai Bay Basin. Chinese Journal of Geology, 43, 50-64. [3] Chen, Z.H., Zha, M. and Jin, Q. (2008) Mineral Element al Response to the Evolution of Terrestrial Brine Faulted-Basin: A Case Study in the Paleogene of Well Haoke-1, Dongying Sag. Acta Sedimentologica Sinica, 26, 924-932. [4] Moon, H.S., Komlos, J. and Jaffe, P.R. (2007) Uranium Reoxidation in Previously Bioreduced Sediment by Dissolved Oxygen and Nitrate. Environmental Science & Technology, 41, 4587-4592.
http://dx.doi.org/10.1021/es063063b [5] Regenspurg, S., Margot-Roquier, C., Harfouche, M., Froidevaux, P., Steinmann, P., Junier, P. and Bernier-Latmani, R. (2010) Speciation of Naturally-Accumulated Uranium in an Organic-Rich Soil of an Alpine Region (Switzerland). Geochimicaet Cosmochimica Acta, 74, 2082-2098.
http://dx.doi.org/10.1016/j.gca.2010.01.007 [6] Mehta, V.S., Maillot, F., Wang, Z.M., Catalano, J.G. and Giammar, D.E. (2014) Effect of Co-Solutes on the Products and Solubility of Uranium (VI) Precipitated with Phosphate. Chemical Geology, 364, 66-75.
http://dx.doi.org/10.1016/j.chemgeo.2013.12.002 [7] Demaison, G.J. and Moore, G.T. (1980) Anoxic Environments and Oil Source Bed Genesis. Organic Geochemistry, 2, 9-31. http://dx.doi.org/10.1016/0146-6380(80)90017-0 [8] Talbot, M.R. and Johannessen, T. (1992) A High Resolution Palaeoclimatic Record for the Last 27,500 Years in Tropical West Africa from the Carbon and Nitrogen Isotopic Composition of Lacustrine Organic Matter, Earth Planet. Science Letters, 110, 23-37. http://dx.doi.org/10.1016/0012-821X(92)90036-U [9] Lyons, R.P., Scholz, C.A., Buoniconti, M.R. and Martin, M.R. (2011) Late Quaternary Stratigraphic Analysis of the Lake Malawi Rift, East Africa: An integration of Drillcore and Seismic-Reflection Data. Palaeogeography, Palaeoclimatology, Palaeoecology, 303, 20-37.
http://dx.doi.org/10.1016/j.palaeo.2009.04.014 [10] Sharp, J.O., Lezama-Pacheco, J.S., Schofield, E.J., Junier, P., Ulrich, K.-U., Chinni, S., Veeramani, H., Margot-Roquier, C., Webb, S.M., Tebo, B.M., Giammar, D.E., Bargar, J.R. and Bernier-Latmani, R. (2011) Uranium Speciation and Stability after Reductive Immobilization in Aquifer Sediments. Geochimica et Cosmochimica Acta, 75, 6497-6510. http://dx.doi.org/10.1016/j.gca.2011.08.022 [11] Fletcher, K.E., Boyanov, M.I., Thomas, S.H., Wu, Q., Kemner, K.M. and Loeffler, F.E. (2010) U(VI) Reduction to Mononuclear U(IV) by Desulfitobacterium Species. Environmental Science & Technology, 44, 4705-4709. http://dx.doi.org/10.1021/es903636c [12] McManus, J., Berelson, W.M., Klinkhammer, G.P., Hammond, D.E. and Holm, C. (2005) Authigenic Uranium: Relationship to Oxygen Penetration Depth and Organic Carbon rain. Geochimicaet Cosmochimica Acta, 69, 95-108. http://dx.doi.org/10.1016/j.gca.2004.06.023 [13] Holba, A.G., Dzou, L.I., Wood, G.D., Ellis, L., Adam, P., Schaeffer, P., Albrecht, P., Greene, T. and Hughes, W.B. (2003) Application of Tetracyclic Polyprenoids as Indicators of Input from Fresh-Brackish Water Environments. Organic Geochemistry, 34, 441-469.
http://dx.doi.org/10.1016/S0146-6380(02)00193-6 [14] Summons, R.E., Hope, J.M., Swart, R. and Walter, M.R. (2008) Origin of Nama Basin Bitumen Seeps: Petroleum Derived from a Permian Lacustrine Source Rock Traversing Southwestern Gondwana. Organic Geochemistry, 39, 589-607. http://dx.doi.org/10.1016/j.orggeochem.2007.12.002 [15] Restituito, E. (1987) Consequences of Redox Conditions on the Distribution of Cations in a Meromictic Oligotrophic Lake. Hydrobiologia, 144, 63-75. http://dx.doi.org/10.1007/BF00008052 [16] Mills, C.T., Amano, Y., Slater, G.F., Dias, R.F., Lwatsuki, T. and Mandernack, K.W. (2010) Microbial Carbon Cycling in Oligotrophic Regional Aquifers near the Tono Uranium Mine, Japan as Inferred from δ13C and Δ14C Values of in Situ Phospholipid Fatty Acids and Carbon Sources. Geochimicaet Cosmochimica Acta, 74, 3785-3805. http://dx.doi.org/10.1016/j.gca.2010.03.016 [17] Begg, J.D.C., Burke, I.T., Lloyd, J.R., Boothman, C., Shaw, S., Charnock, J.M. and Morris, K. (2011) Bioreduction Behavior of U(VI) Sorbed to Sediments. Geomicrobiology Journal, 28, 160-171.
http://dx.doi.org/10.1080/01490451003761137 [18] Senko, J.M., Kelly, S.D., Dohnalkova, A.C., McDonough, J.T., Kemner, K.M. and Burgos, W.D. (2007) The Effect of U(VI) Bioreduction Kinetics on Subsequent Reoxidation of Biogenic U(IV). Geochimica et Cosmochimica Acta, 71, 4644-4654. http://dx.doi.org/10.1016/j.gca.2007.07.021