Ancient landform restoration of marginal sedimentary area in the continental depression basin: A case study of the Triassic Baikouquan Formation in Mahu area of Junggar Basin
He Wen-Jun, Zheng Meng-Lin, Fei Li-Ying, Wu Ai-Cheng, Yang Tong-Yuan, Ding Jing
Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China
Abstract The main techniques of ancient landform restoration focus on formation thickness,ignoring the inaccuracy caused by differential subsidence before deposition. Take the study of ancient landform restoration before deposition of the Triassic Baikouquan Formation in Mahu area of Junggar Basin for example, the authors put forward a new technology of deposition trend correction. The depositional system before the Baikouquan Formation is alluvial fan-fan delta in the background of continental margin denudation zone-transition zone-sedimentary zone,the stratigraphic thickness method can reasonably describe the underwater part of the lake basin,but can not reasonably describe its ancient landform features of the continental part. Based on the geological data from the research area,the authors selected residual thickness method and seismic flattening method to restore the ancient landform. The authors get the true thickness of the Triassic Baikouquan Formation firstly,after compaction and paleobathymetric correction,we correct the deposition trend of the continental part finally. The result shows that,the ancient landform after correction is more reasonable than before,and it is more accurate to guide the analysis of the complex source-sink depositional system.
Fund:Co-funded by the National Science and Technology Major Projects of China(Nos. 2016ZX05003-005,2017ZX05008-006-003-001),and the National Basic Research Development Plan “973” Projects(No.2014CB239002)
About author: He Wen-Jun,born in 1988,master degree candidate, is an engineer in the Research Institute of Exploration and Development,Xinjiang Oilfield Company. He is mainly engaged in petroleum resource assessments and petroleum exploration. E-mail: fchwj@petroChina.com.cn.
Cite this article:
He Wen-Jun,Zheng Meng-Lin,Fei Li-Ying et al. Ancient landform restoration of marginal sedimentary area in the continental depression basin: A case study of the Triassic Baikouquan Formation in Mahu area of Junggar Basin[J]. JOPC, 2019, 21(5): 803-816.
He Wen-Jun,Zheng Meng-Lin,Fei Li-Ying et al. Ancient landform restoration of marginal sedimentary area in the continental depression basin: A case study of the Triassic Baikouquan Formation in Mahu area of Junggar Basin[J]. JOPC, 2019, 21(5): 803-816.
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