Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 86-96.doi: 10.3969/j.issn.1673-8926.2018.01.009

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Sedimentary characteristics and development model of fan delta in small faulted basin: a case of Shahezi Formation in northern Xujiaweizi Fault Depression,NE China

CAI Quansheng1,2, HU Mingyi2,3, CHEN Xiaohong1, HU Zhonggui3   

  1. 1. Wuhan Center of China Geological Survey, Wuhan 430205, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Ministry of Education, Yangtze University, Wuhan 430100, China;
    3. School of Geosciences, Yangtze University, Wuhan 430100, China
  • Received:2017-08-10 Revised:2017-11-13 Online:2018-01-21 Published:2018-01-21

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Abstract: The geological knowledge of fan delta in small-scale faulted basins will be of important significance for oil & gas exploration. Taking Shahezi Formation in the northern Xujiaweizi Fault Depression as an example, the data of core,logging and seismic were used to study the sedimentary characteristics and development model of fan delta in a small faulted basin formed during the intensive rifting stage. The results show that fan delta develops in Shahezi Formation within the study area,and the sediments of fan delta are mainly composed of brown to grey sandy conglomerate with low maturity,brown and black mudstone,and locally distributed carbonized mudstone. On the logging curves,the sandy conglomerate appears as zigzag shape with medium amplitude and zigzag box;on the imaging logging profiles,the conglomerates with high content of argillaceous sediments appear as bright spots with different size on black background. Furthermore,according to well-seismic calibrating,the sediments of fan delta typically show sphenoid progradation reflections,moundy and sphenoid disorder reflections on seismic profiles. By the analysis of fan delta distribution in Shahezi Formation,it indicates that the development of fan delta is closely related to basin scope and tectonic features. During the early sedimentary stage of the Shahezi Formation,not only the west steep slope but also the east gentle slope was dominated by fan deltas due to the small scope of the basin and sufficient sediments with short transportation distance. However,with the continuous activity of basin-controlling fault and the extension of basin,the fan delta on east gentle slope was gradually replaced with braided delta,and the differentiation characteristics of sedimentary facies on different tectonic belts become obvious. According to these features above,the development model of fan delta in a small fault basin formed during the intensive rifting stage was proposed,which will be very important for the oil and gas exploration in similar basins.

Key words: natural gas genesis, accumulation stages, accumulation process, Xujiahe Formation, southern Sichuan Basin

CLC Number: 

  • TE121.3
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