岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 25–29.doi: 10.3969/j.issn.1673-8926.2015.05.005

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地延长组数字露头表层建模方法研究

曾齐红1,马乙云12,谢 兴1,张友焱1,叶 勇1,刘 松1   

  1.  1. 中国石油勘探开发研究院,北京 100083 ; 2. 长江大学 地球科学学院,武汉 430100
  • 出版日期:2015-09-26 发布日期:2015-09-26
  • 第一作者:曾齐红( 1980- ),女,博士,高级工程师,主要从事遥感油气地质应用方面的研究工作。 地址:( 100083 )北京市海淀区学院路 20 号中国石油勘探开发研究院。 E-mail : zengqihong@petrochina.com.cn 。
  • 基金资助:

    国家重大科技专项“复杂储层油气测井解释理论方法与处理技术”(编号: 2011ZX05020-008 )资助

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

摘要:

根据地面激光雷达、高精度差分 GPS 和高精度数码影像资料,制定数字露头野外数据采集方案,建立激光雷达点云数据拼接和坐标转换处理流程,提出基于最佳趋势面的三角网建模方法和数字露头表层模型优化方法。 利用该方法,建立了鄂尔多斯盆地延长组谭家河露头的数字露头表层模型,在该模型的基础上开展了露头砂体展布与发育情况的分析,对识别出的三角洲平原分流河道砂体和三角洲前缘水下分流河道砂体进行了定量描述,前者单河道砂体垂向上呈孤立叠置样式,宽厚比小,后者单河道砂体垂向上呈多期连续叠置样式,宽厚比明显较大,进而对露头砂泥岩分布进行分析。 该区砂体发育受沉积环境控制,分流河道以及水下分流河道砂体发育区砂地比明显较大,砂地比由小变大的方向为北东—南西向,与研究区物源方向基本一致。

关键词: 激光雷达, 数字露头, 地质建模, 礁滩复合体, 塔里木盆地

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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