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The oleanane parameter,i.e.,OP(oleananes/(oleananes+C_(30)hopanes))in the two sedimentary columns of the Beibuwan Basin,South China Sea,can be used to delimit the top of oil generation window,with R_o(/%)of 0.53 in Well M1 and 0.55 in Wells H1/Hd1/Hd2,respectively.Comparing with vitrinite reflectance(R_o/%),the OP features a dynamic range and can indicate the oil generation window more precisely.By using OP and other geochemical indices,the oil-source correlation is also conducted.It suggests that the oils in wells M1 and M2 are derived from the source rocks in situ.The mudstone in Huachang uplift is not the main source rocks for oils in this area.The OP is also a useful oil-source correlation parameter in some Tertiary lacustrine basins.
The oleanane parameter, ie, OP (oleananes / (oleananes + C_ (30) hopanes)) in the two sedimentary columns of the Beibuwan Basin, South China Sea, can be used to delimit the top of the oil generation window, with R_o (/ %) of 0.53 in Well M1 and 0.55 in Wells H1 / Hd1 / Hd2, respectively. Comparing with vitrinite reflectance (R_o /%), the OP features a dynamic range and can the the oil generation window more precisely. By using OP and other geochemical indices, the oil-source correlation is also conducted. It means that the oils in wells M1 and M2 are derived from the source rocks in situ. The mudstone in Huachang uplift is not the main source rocks for oils in this area. The OP is also a useful oil-source correlation parameter in some Tertiary lacustrine basins.