oNormal style="MARGIN: 0cm 0cm 0pt">ot;Times New Roman">Based on the analysis of the precise biomarker characteristics, type classifications and comparison of crude oil and source rocks, the effective source rocks of Yanchang formation in southern Erdos Basin were considered to be oil shale and mudstone in Chang 7. The identification mark of biomarker-normal geochemical evaluation-log electrical parameters in Yanchang formation of upper Triassic in southern Erdos Basin was established according to the geochemical characteristics and logging characteristics. The parameters are as follows ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">:ot;Times New Roman"> 8 ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">βot;Times New Roman"> ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">(ot;Times New Roman">Hot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">)ot;Times New Roman"> -homodrimane/8 ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">βot;Times New Roman"> ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">(ot;Times New Roman">Hot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">)ot;Times New Roman"> -drimanes ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〈ot;Times New Roman">2, w ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">(ot;Times New Roman">TOCot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">)ot;Times New Roman"> ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〉ot;Times New Roman"> 1.6%, S1 ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">+ot;Times New Roman">S2 ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〉ot;Times New Roman">4 mg/g, IHot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〉ot;Times New Roman">170 mg/g, GRot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〉ot;Times New Roman">120 API, ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">△ot;Times New Roman">tot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〉ot;Times New Roman">260ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">μot;Times New Roman">s/m,RTot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〉ot;Times New Roman">15ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">Ω•ot;Times New Roman">m, CNLot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">〉ot;Times New Roman">27%. Logging calculation formula of w ot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">(ot;Times New Roman">TOCot;FONT-FAMILY: 宋体; mso-ascii-font-family: ’Times New Roman’; mso-hansi-font-family: ’Times New Roman’">)ot;Times New Roman"> and IH was established according to the correlation of geochemical parameters and electrical ones, which has realized the cohesion of geochemical information of limited core to the whole interval logging information.