Sedimentary characteristics,controlling factors and genesis of retrogradational fan(braided)delta front-beach bar composite gravel body in the Permian Upper Urho Formation in Junggar Basin
GUO Wenjian1, GUO Ruijing2, TANG Yong1, JI Youliang2, MA Zhengtao2, LIU Xiaoyu2, LIANG Tao2, MA Yulong2
1 Research Institute of Exploration and Development of Petrochina Xinjiang Oilfield Company,Xinjiang Karamay 834000,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
Abstract：In recent years,oil and gas exploration in the Junggar Basin has gradually shifted from conventional traps outside the source to lithological traps within the source. The Upper Urho Formation is currently the main exploration target for boosting reserves and production in the basin. The distribution of sedimentary system has a controlling effect on the distribution of lithological reservoirs in the Upper Urho Formation. Using drilling cores,thin sections,combined with seismic data and drill cuttings and wireline logs,this study identified and characterized the sedimentary facies and depositional systems of the Upper Urho Formation in the Junggar Basin,and summarized the large-scale transgression. The sedimentary model of fan(braided river)delta-beach bar composite sandy conglomerate body was analyzed,and its controlling factors were analyzed. The results show that: (1)The study area is characterized by various sedimentary facies,including fan delta,braided river delta,and shallow lake beach bar. Among them,fan-delta plain and fan-delta front are mainly developed in the west of the basin,while braided river-delta plain and braided river delta front mainly developed in the east and north of the basin,and beach-bar is mainly superimposed on fan-delta and braided river-delta fronts or occurs independently at their front ends. (2)The depositional system of each member of the Upper Urho Formation developed under the background of overall lacustrine transgression. During the first member of Urho Formation,the basin was relatively small,and the deposited sand bodies were thick and of limited lateral extent,located in proximity to the depression center;during the second member of Upper Urho Formation,with continuous sediment supply and increased water depth the area of the lacustrine basin increased,with thinner but more extensive sand bodies deposited;during the third member of Upper Urho Formation,lacustrine transgression was enhanced,basin area was thus further expanded,and lacustrine mudstone was widely developed in the basinal area. (3)The fan(braided river)delta front-beach-bar composite gravel body was formed under continuous change of lake level and transformation of lake waves in the fan delta state and braided river delta front. (4)During the depositional period of the Upper Urho Formation in the Junggar Basin,the main controlling factors of the depositional system were climate,source supply,lake-level changes,and palaeotopographic slope and palaeogeomorphology at the time of deposition. This study provides a geological basis for oil and gas exploration in the Upper Urho Formation.
GUO Wenjian,GUO Ruijing,TANG Yong et al. Sedimentary characteristics,controlling factors and genesis of retrogradational fan(braided)delta front-beach bar composite gravel body in the Permian Upper Urho Formation in Junggar Basin[J]. JOPC, 2024, 26(3): 584-599.
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