Sedimentary characteristics and controlling factors of river-dominated fan delta: a case study from the Upper Urho Formation in Mahu sag of Junggar Basin
Zou Zhi-Wen1, Guo Hua-Jun1, Niu Zhi-Jie2, Xu Yang1, Shan Xiang1, Li Ya-Zhe1, Shen Jin-Long1
1 Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China; 2 Xinjiang Oilfield Company Exploration and Development Research Institute,PetroChina,Xinjiang Karamay 834000,China
Abstract In recent years,the study of fan-delta is helpful for the exploration of oil and gas,which attracts more attention on the detailed classification of fan-delta. The sedimentary characteristics and controlling factors of the river dominated fan-delta in the upper Urho Formation in Mahu sag of the Junggar basin is analyzed based on the core data from 23 wells,logging data,geomorphology and seismic data. There are 3 classes,8 subclasses and 22 types of lithofacies in the upper Urho Formation. Among them,the lithofacies linked to traction current takes a large proportion and the space between gravels and pebbles are filled or partly-filled by sandy grains. Ten types of microfacies such as braided channel,debris flow unit,subaqueous distributary channel and mouth bar are distinguished and the braided channel and subaqueous distributary channel are the dominated microfacies. The plane morphology of the river dominated fan-delta is usually fan shape with a high length-width ratio. There are four major fan-delta system named Zhongguai,Karamay,Baijiantan and Dabasong in Mahu sag. The sedimentation in the river dominated fan-delta is controlled by humid climate and paleo-geomorphology. According to paleoclimate and paleogeomorphology analysis of the Upper Urho Formation,the depositional sequence model of fan-delta in Mahu sag is established,which can provide the geological basis for the identification of microfacies in the fan delta and the petroleum exploration of similar sedimentary basins.
Fund:Co-funded by the National Science and Technology Major Project(No.2017ZX05001-002)and Major Science and Technology Project of CNPC(No.2017E-0401)
About author: Zou Zhi-Wen,born in 1981,senior engineer of petroleum geology,is engaged in sedimentology research. E-mail: zouzw_hz@petroChina.com.cn.
Cite this article:
Zou Zhi-Wen,Guo Hua-Jun,Niu Zhi-Jie et al. Sedimentary characteristics and controlling factors of river-dominated fan delta: a case study from the Upper Urho Formation in Mahu sag of Junggar Basin[J]. JOPC, 2021, 23(4): 756-770.
Zou Zhi-Wen,Guo Hua-Jun,Niu Zhi-Jie et al. Sedimentary characteristics and controlling factors of river-dominated fan delta: a case study from the Upper Urho Formation in Mahu sag of Junggar Basin[J]. JOPC, 2021, 23(4): 756-770.
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