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天然气地球科学 doi: 10.11764/j.issn.1672-1926.2017.06.006

• 天然气勘探 • 上一篇    下一篇

基于地震信息的沉积体系平面分布特征研究——以鄂尔多斯盆地延长探区高家河三维区本溪组下部沉积体系为例

王永炜1,2，李荣西1，赖生华3   

  1. 1.长安大学地球科学与资源学院,陕西 西安 710064；
    2.陕西延长石油（集团）有限责任公司研究院，陕西 西安 710075；
    3.西安石油大学地球科学与工程学院，陕西 西安 710065
  • 收稿日期:2016-11-17 修回日期:2017-05-05 出版日期:2017-06-10 发布日期:2017-06-10
  • 通讯作者: 赖生华（1966-），男，重庆铜梁人，教授，主要从事沉积学、地震沉积学研究. E-mail：laishenghua@126.com.
  • 作者简介:王永炜（1965-），男，甘肃宁县人，高级工程师，博士，主要从事油气勘探开发和油田化学研究. E-mail：wyw650715@126.com.
  • 基金资助:

    国家自然科学基金项目（编号：41372118）；陕西省科技计划项目（编号：2014K10-12）联合资助.

Depositional system distribution characteristics based on seismic data：Case study of the Lower Benxi Formation, Gaojiahe 3-D block,Yanchang exploration area，Ordos Basin,China

Wang Yong-wei1,2，Li  Rong-xi1，Lai Sheng-hua3   

  1. 1.School of Earth Science and Resources,Chang'an University,Xi'an 710064,China;
    2.Research Institute of Shannxi Yanchang Petroleum（Group） Co.Ltd.，Xi'an 710075,China;
    3.College of Earth Science and Engineering,Xi'an Shiyou University,Xi'an 710065，China
  • Received:2016-11-17 Revised:2017-05-05 Online:2017-06-10 Published:2017-06-10

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摘要：

阐明了利用地震信息研究沉积体系平面分布特征的方法。基于90°相位地震数据体，利用时频分析技术，分析砂层地震反射频率；结合地震滤波，压制砂层地震干涉作用。利用高精度层序地层学及地震沉积学研究技术，在地震剖面上建立高频等时地层格架。最后，将地质、测井及地震相结合，对不同主频的地层切片进行沉积学解释。结合混频显示，主成分分析（PCA）及空间雕刻技术，确定沉积体系空间分布。研究表明，研究区本溪组下部（C2b2）沉积时期主要发育障壁滨岸沉积体系。研究区东部可能发育一较大规模的潮道。在S229—S228区域、S207—S209区域、S224—Y287区域及Y123区域也发育树枝状潮道或潮渠，主要呈南北向、北西向展布。潮道为主要富砂区域，测井上表现为钟形或齿状钟形相，地层切片上表现为线状强能量分布模式。砂坪主要发育在S231—S208区域，沿潮道边缘分布，夹泥层，测井相类型多种多样，见漏斗状、箱状及复合漏斗状。砂坪或砂斑在地层切片上表现为斑状及蠕虫状中—强能量反射模式。该方法有助于提高预测沉积体系的精度，对研究区内的天然气勘探具有重要价值。

关键词: 本溪组, 地震沉积学, 时频分析, 混频显示

Abstract:

This study focuses on the exploration of Gaojiahe 3-D area in the lower part (C2b2) Benxi Formation of Upper Paleozoic,Ordos Basin.The method using seismic information to study sedimentary system distribution characteristics was expounded.Based on 90 degree phase seismic sets,using frequency analytical technology,sand seismic reflection frequency is analyzed.Combined with seismic filtering,the sand seismic interference effect was pressed.On the basis of high resolution sequence stratigraphy analysis and the stratigraphic framework of seismic sedimentology study of technology,the high frequency seismic profile was established.Finally,different frequency strata slice was interpreted by combining the geological,well logging and seismic sedimentology.Combined with mixing display,principal component analysis (PCA) and space carving technique,the spatial distribution of sedimentary system was determined.The method is helpful to improve the accuracy of the prediction system.The study shows that the Lower Benxi Formation (C2b2) is mainly developed with barrier-shoreline depositional system.A large-scale tidal channel developed in the east area.The branches of the tidal channel or tidal canal are also developed in the S228-S207,S209-S229,Y287-S224 and the Y123 area,which mainly extend from north to west or north to south.Tidal channel performed as the main sand rich region and the logging performed as bell or dentate bell shape,and the strata slice performed linear strong energy distribution pattern.Sand flat are developed in the S208-S231 area and distributed along the edge of the tidal channel interbedded with mud layer.Sand flat show a variety types of logging facies,for example,the funnel shape,box or composite funnel shape.Sand flat or sand spots in the strata slice performed as mid-strong energy reflection mode with porphyritic-vermicular shape.

Key words: Benxi Formation, Seismic sedimentology, Time-frequency analysis, Mixing display

中图分类号: 

  • TE131.1+3

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