首页|期刊简介|投稿指南|分类索引|刊文选读|订阅指南|证明资料|样刊邮寄查询|常见问题解答|联系我们
张军华,李琴,王延光,等. 用相干体识别古河道及实际应用[J]. 科学技术与工程, 2020, 20(35): 14431-14439.
Zhang Junhua,李琴,王延光,et al.Theoretical Model Analysis and Practical Application of Identifying Channel with Coherence[J].Science Technology and Engineering,2020,20(35):14431-14439.
用相干体识别古河道及实际应用
Theoretical Model Analysis and Practical Application of Identifying Channel with Coherence
投稿时间:2019-12-03  修订日期:2020-08-30
DOI:
中文关键词:  三维河道模型  串珠状反射特征  第三代相干  特征值  信噪比  分辨率  时窗大小
英文关键词:3D channel model  beaded reflection characteristics  the third generation coherence  rigenvalue  S/N ratio  resolution  time window size.
基金项目:国家科技重大专项(2017ZX05009-001,2016ZX05006-002)
                 
作者单位
张军华 中国石油大学(华东)地球科学与技术学校
李琴 中国石油大学(华东)地球科学与技术学校
王延光 中国石化胜利油田分公司物探研究院
冯德永 中国石化胜利油田分公司物探研究院
黄德峰 中国石油大学(华东)地球科学与技术学校
刘震 中国石油大学(华东)地球科学与技术学校
摘要点击次数: 176
全文下载次数: 70
中文摘要:
      相干体是识别河道的一种常用技术,但是其机理很少有人解剖。本文制作三维河道模型对此进行了较深入的研究与分析,并用实际资料进行了测试与检验。研究认为:(1)相干计算最关键的是需搞清楚特征值的结构与基本特征。以三道组合相干为例,河流相储层的第一特征值值很大,砂体对应相干大的值;第二特征值能反映河道的边缘信息;第三特征以背景噪声为主,它和第二特征值一样,其数值比第一特征值要小很多。(2)C31、C34、C35基本上是同一类型的相干体,C31和C34差别不大,C35背景噪声相对较大;C32即所谓的混沌属性,是以负值为异常的,河流相储层的识别效果要好于断块、裂缝型储层;C33无论是河道识别还是去背景噪声效果都不好;本文提出的C36相干体,也是以小值为有利异常的,但数值是上是正的,实际应用发现它对弯曲河道和小河道识别效果更好。(3)时窗大小会影响相干结果,时窗太小会降低相干体的信噪比,太大会降低河道的纵向分辨率并混入假构造。对于河流相储层,取河道复合波的1/3长度,是比较理想的时窗选择。
英文摘要:
      With the common use of coherence in identifying the ancient channels, the mechanisms of coherence is seldom analyzed. In this paper, the 3D ancient channel model is established and tested with real seismic data. The conclusions were?drawn?as?follow: (1) The crucial problem about coherent computing is to obtain the characteristics of eigenvalues. The three traces combined coherence was taken as an example. The first eigenvalue is main that is larger than the second one. The second eigenvalue indicates the edge of the channel. Being dominated by background noise, the third one is much smaller than the first one. (2) C31、C34、C35 share the similar type of coherence. The differences lie on the larger noise of C35 compared with C31 and C34. As called as “chaos” attribute, C32 has a negative value and its identification of channel facies is better than fault blocks and fractured reservoirs. C33 is not suitable for channel recognition or background denoise. In this paper, the C36 coherence in terms of small positive value was proposed. The practical application shows that C36 has better recognition on curved channel and small channel. (3) The coherent results could be affected by the size of the window. The S/N ratio of coherence will be reduced with a small window. The vertical resolution of channel will be reduced and mixed with the pseudo structure with a large window. For the fluvial reservoir, the ideal window is 1/3 compound wavelength of channel.
查看全文  查看/发表评论  下载PDF阅读器
关闭
你是第35087598位访问者
版权所有:科学技术与工程编辑部
主管:中国科学技术协会    主办:中国技术经济学会
Tel:(010)62118920 E-mail:stae@vip.163.com
京ICP备05035734号-4
技术支持:本系统由北京勤云科技发展有限公司设计

京公网安备 11010802029091号