LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (6): 55-63.doi: 10.3969/j.issn.1673-8926.2015.06.008

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Detailed architecture analysis of mouth bar in delta front based on sedimentary process: A case study of L11 layer in Laojunmiao Oilfield

Qin Guosheng 1,2,Wu Shenghe 2,Zheng Lianyong 3,Yu Chen 1,3   

  1.  1. PetroChina Research Institute of Petroleum Exploration & Development ， Beijing 100083 ， China ； 2. College of Geosciences ，China University of Petroleum ， Beijing 102249 ， China ； 3. Research Institute of Exploration and Development ，PetroChina Yumen Oilfield Company ， Jiuquan 735200 ， Gansu ， China
  • Online:2015-12-20 Published:2015-12-20
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    秦国省（ 1988- ），男，中国石油大学（北京）在读硕士研究生，研究方向为精细油藏描述及开发地质。 地址：（ 102249 ）北京市昌平区府学路 18 号中国石油大学（北京）地球科学学院。 电话：（ 010 ） 89733465 。 E-mail ： qin8002008@163.com 。

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Abstract:

Based on abundant well drilling data and geological research results in Laojunmiao Oilfield, detailed architecture analysis was carried out in the L11 layer where mouth bars are well developed. In the view of sedimentary process, the hierarchical system of mouth bar was discussed, taking the single mouth bar controlled by terminal underwater distributary channel as the third order architecture unit, the complex single mouth bar controlled by trunk underwater distributary channels as the fourth order architecture unit, and the multiple mouth bar controlled by several trunk underwater distributary channels as the fifth order architecture unit. The signs of single mouth bar were clarified, and 14 single bars were identified in the study area. According to the principle of sedimentation that bar formed in different time has different bar bottom elevation, sedimentary sequence can be constructed in the transverse section, meanwhile, the time sequence can be constructed in the longitudinal section. Integrated with 3D comprehensive analysis, the evolution time of different bars was determined. Under the guidance of the principles of sedimentology, the sedimentary process in the delta front bar was constructed. The size of single bar and the connect relationship between different bars were well coupled with the sedimentary process.

Key words:  complex sand-conglomerate bodies , quantitative lithology identification , array induction , wave impedance

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