LITHOLOGIC RESERVOIRS ›› 2016, Vol. 28 ›› Issue (3): 34-41.doi: 10.3969/j.issn.1673-8926.2016.03.006

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Sedimentary characteristics and evolution model of delta in backbulge zone:A case study in Sangtamu area

Tang Wu1， Wang Yingmin2， Zhong Mihong3   

  1.  1. CNOOC Research Institute ， Beijing 100028 ， China ； 2. Ocean College ， Zhejiang University ， Hangzhou 310023 ， China ；3. Research and Development Center ， CNOOC Gas and Power Group ， Beijing 100028 ， China
  • Online:2016-05-20 Published:2016-05-20

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Abstract:

 Tarim Basin entered into foreland basin evolution stage during Triassic period, forming three typical tectonic units （foredeep, forebulge, and backbulge）. In order to discuss the sedimentary characteristics of deltas in the backbulge zone, based on the comprehensive analyses of cores, logging, analysis assay as well as 3D seismic data, the sedimentary characteristics of Triassic Karamay Formation in Sangtamu area were analyzed. The results show that two types of deltas were developed in the study area, namely braided river delta and meandering river delta, and it changed from the former to the latter vertically. The underlying braided river delta is mainly consisted of coarse sandstone, with well lateral continuity and large thickness, while the overlying meandering river delta is exact opposite. Both deltas mainly developed plain and front subfacies. The plain subfacies of braided river delta is primarily composed of distributary channel, while the subaqueous distributary channel microfacies composes the main part of front subfacies, with mouth bar and distal bar locally developed. The distributary channel, levee and swamp microfacies can be identified in meandering river delta plain subfacies, and its front subfacies is chiefly consisted of subaqueous distributary channel and mouth bar. The delta pattern transformation in the study area is controlled by topographic slope change caused by tectonic activities of foreland basin. The paleoclimate changed from arid-semiarid to humid also played an important role. Finally, based on the origin analysis of deltas, the evolution models of delta in backbulge zone were built.

Key words: fan delta, glutenite, Baikouquan Formation, Mabei slope, Jungger Basin

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