Abstract :
In this discussion, we compare the interpretation of data on an Eocene sour gas and high-sulfur oil accumulation from the Jinxian Sag, Bohai Bay Basin, China, provided by [Zhang, S.C., Zhu, G.Y., Liang, Y.B., Dai, J.X., Liang, H.B., Li, M.W., 2005. Geochemical characteristics of the Zhaolanzhuang sour gas accumulation and thermochemical sulfate reduction in the Jixian Sag of Bohai Bay Basin. Organic Geochemistry 36, 1717–1730.] with our earlier published interpretation [Cai, C.F., Worden, R.H., Wolff, G.A., Bottrell, S., Wang, D.L., Li, X., 2005. Origin of sulfur rich oils and H2S in Tertiary lacustrine sections of the Jinxian Sag, Bohai Bay Basin, China. Applied Geochemistry 20, 1427–1444.]. While [Zhang, S.C., Zhu, G.Y., Liang, Y.B., Dai, J.X., Liang, H.B., Li, M.W., 2005. Geochemical characteristics of the Zhaolanzhuang sour gas accumulation and thermochemical sulfate reduction in the Jixian Sag of Bohai Bay Basin. Organic Geochemistry 36, 1717–1730.] considered that TSR was the cause of the elevated H2S, in contrast we concluded that BSR was the process responsible for the high concentrations of H2S. This in turn led to the unusually high degree of sulfurization of the oil. We here contend that there is no evidence in support of TSR in the Eocene sediments of the Jinxian Sag, Bohai Bay Basin, China.
