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柴达木盆地新生代地层广泛分布,富含油气资源。长期以来,各组时代归属存在较大争议。本文以介形类、孢粉和轮藻微体化石为基础,重新探讨了柴达木盆地新生界各组的地质年代归属:路乐河组为古新世—始新世中期;下干柴沟组沉积时代主体为始新世中晚期,渐新世早期也有部分沉积;上干柴沟组为渐新世早期—中新世早期;下油砂山组为中新世早—中期;上油砂山组为中新世中—晚期;狮子沟组为中新世晚期—上新世晚期;七个泉组为更新世早—中期。柴达木盆地新生界各组地质年代的确定对盆地内油气勘探工作具有重要意义。
The Cenozoic strata in the Qaidam Basin are widely distributed and rich in oil and gas resources. For a long time, there is much controversy over the ownership of each group. Based on the genera of ostracods, sporopollen and chaetocervical microfossils, the paper reexamined the geologic age belts of all groups in the Cenozoic in the Qaidam Basin: the Lulehe Formation is from the Paleocene to mid-Eocene; The main body of the sedimentary age of the Goup Formation was mid-late Eocene, and some sediments were also formed in the early Oligocene. The Upper Ganchaigou Formation was Early Oligocene-Early Miocene; the Lower Yanshan Formation is early-middle Miocene; The Sanshan Formation is mid-Miocene; the Shizigou Formation is late Miocene-Pliocene; the Qijuquan Formation is early Pleistocene-mid-Pleistocene. The determination of the geologic age of each group in the Cenozoic in the Qaidam Basin is of great significance for oil and gas exploration in the basin.