Provenance and depositional systems during the depositional period of interval 8 of Upper Triassic Yanchang Formation in Qingyang area，Ordos Basin
Yang Binhu1,2, Bai Haiqiang1, Dai Yaquan1,2, Zha Li2, Li Jian1,2, Jin Wenqi2, Liu Xinju2
1 State Key laboratory of Dynamics，Northwest University，Xi'an 710069，Shaanxi 2 The First Petroleum Production Division of PetroChina Changqing Oilfield Company，Yanan 716000，Shaanxi
Abstract Based on the field outcrop palaeo-current measurements and studies of the sandstone framework mineralogy and heavy mineral assemblages, we utilized clastic rock geochemical methods to define the provenance during the deposition of interval 8 of the Upper Triassic Yanchang Formation in Qingyang area，Ordos Basin. The results show that the palaeo-current in the study area was mainly SW-NE and NW-SE and SE-NW currents were of secondaryimportance. Distribution of heavy minerals is also characterized by obvious zoning patterns. The REE matching pattern of the interval 8 is a “right-declined” type. The average value of δEu is 0.67. The variation characteristics of trace elements are largely consistent with those shown by the Longshan Group of the Longxi Palaeo-land in the southwestern margin of the basin. According to the sandstone clastic components especially the lithic components and heavy mineral characteristics，the source rocks of interval 8 in Qingyang area were mainly derived from the Meso-Proterozoic to Paleozoic of the Longxi Palaeo-land, the granitoids along the Qilian Orogenic Belt and the Ordovician-Permian along the Qinling Orogenic Belt. The detrital source rocks are dominated by metamorphic and igneous rocks. According to the current drilling results combined with the field outcrops，it is proved that the interval 8 of Yanchang Formation was dominated by the fan delta depositional system with fan deltaic front and(semi)deep lacustrine turbidite fan subfacies being developed. The subaqueous distributary channel sandbodies of the delta front constitute the favorable facies belt for petroleum accumulation.
About author: Yang Binhu，born in 1965， is a candidate for doctoral degree in Northwest University and a senior engineer at the First Petroleum Production Division of Changqing Oilfield Company. Now he is engaged in sedimentology and management for hydrocarbon exploration and development.
Cite this article:
Yang Binhu,Bai Haiqiang,Dai Yaquan et al. Provenance and depositional systems during the depositional period of interval 8 of Upper Triassic Yanchang Formation in Qingyang area，Ordos Basin[J]. JOURNAL OF PALAEOGEOGRAPHY, 2008, 10(3): 251-259.
Yang Binhu,Bai Haiqiang,Dai Yaquan et al. Provenance and depositional systems during the depositional period of interval 8 of Upper Triassic Yanchang Formation in Qingyang area，Ordos Basin[J]. JOPC, 2008, 10(3): 251-259.
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