LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 25-29.doi: 10.3969/j.issn.1673-8926.2015.05.005

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Surface modeling method of digital outcrop of Yanchang Formation in Ordos Basin

Zeng Qihong1, Ma Yiyun12, Xie Xing1, Zhang Youyan1, Ye Yong1, Liu Song1   

  1.  1. PetroChina Research Institute of Petroleum Exploration & Development , Beijing 100083 , China ;2. School of Geosciences , Yangtze University ,Wuhan 430100 , China
  • Online:2015-09-26 Published:2015-09-26

Abstract:

Combined with ground-based Lidar, high accuracy difference GPS and high precision digital image, this paper summarized field data acquisition scheme of digital outcrop, established the Lidar point cloud data splicing and coordinate conversion process, put forward triangular mesh modeling method based on optimal trend surface and optimization method of digital outcrop surface model. The surface modeling method of digital outcrop provides an effective basis for the outcrop fine quantitative study. Using this method, this paper established digital outcrop surface model of Tanjiahe outcrops of Yanchang Formation in Ordos Basin, and carried out outcrop sand body distribution and development analysis based on the digital outcrop model. Delta plain distributary channel sand body and delta front underwater distributary channel sand body were identified on the Tanjiahe digital outcrop model. The vertical overlap relationship of the former single channel sand body is isolated, and its width-thickness ratio is relatively small; the latter single channel sand body is multi period continuous stacking in the vertical direction, and its widththickness ratio is significantly larger. Analysis result of outcrop sandstone and mudstone distribution indicates that due to the development of sand bodies controlled by sedimentary environment, sand ratio of distributary channel and underwater distributary channel sand body development area was significantly larger. Sand ratio gradually increased from northeast to southwest, and it is basically consistent with the source direction of the study area.

Key words: Li dar , di gi t alout crop , geol ogi cm odel i ng , reef -shoalbody , Tari m Basi n

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