首页 | 本学科首页   官方微博 | 高级检索  
     检索      

马尔柯夫链法在建立沉积相模式中的应用
引用本文:朱筱敏,信荃麟.马尔柯夫链法在建立沉积相模式中的应用[J].沉积学报,1987,5(4):96-106.
作者姓名:朱筱敏  信荃麟
作者单位:华东石油学院
摘    要:本文采用统计学中的马尔柯夫链方法来建立地方性相模式,介绍了马尔柯夫链建立相模式的过程,并对惠民凹陷沙河街组三段的三角洲和深水浊积扇进行了分析研究。实践证明,马尔柯夫链法特别适用于具大量资料的韵律性碎屑岩地层剖面的相模式建立,并且是一种简化复杂地层序列、反映沉积物沉积规律的行之有效的方法。

关 键 词:马尔柯夫链    三角洲    浊积扇相模式
收稿时间:1985-09-16

APPLICATION OF MARKOV CHAIN METHOD TO ESTABLISHMENT SEDIMENTARY FACIES MODEL
Institution:The gradute School of Beijing, East China Petroleum Institute)Xin Quanlin(East China Petroleum Institute
Abstract:Observed the cores from 11 wells and the loggings from approximate 300 wells in 3rd Member of the Lower Tertiary Shahejie Formation in the west Huimin seg, and analyzed sedimentary facies, Linpan Delta and the Shanghe deepwater turbidite fan and other sedimentary environments were determined. Linpan Delta and the Shanghe turbidite fan have a lot of different characteristics in lithology, sedimentary structure, grain size, logging, and paleontological assemblage etc. The lobate Linpan Delta Paralleled the axis direction of Huimin seg, 35 kilometers in length, over 700 meters in accumulating thickness. The delta displays a reverse cycle on the whole vertical section. The reverse rhythm of the predelta and delta front consisted of grey mudstone and light grey siltstone, fine grained sandstone, about 8 meters in thickness, and appeared frequently; the normal rhythm of the delta plain consisted of light grey, and greyish green siltstone, fine grained sandstone, medium grained sandstone and brown mudstone, carbonaceous shale, 1-4 meters in thickness. The normal rhythm often overlaies the reverse one, constituting a complete delta composite rhythm. The maturity of sandstone composition is lower, the content of quartz 50-60%, feldspar 20-30%, rock fragment 10-20%, clay 5-10%. The maturity of its texture is higher, moderate-well sorted and grain supported texture. The grain size data indicate the feature of typical drawning-current. The probability graphs of the delta are two-lines which consits of suspension and saltation populations, CM diagram consists of segment QRS. There are many types of sedimentary structures, such as cross bedding, parallel stratification, and vegetable foot etc. The vertical sequence of the sedimentary stuctures reflects the delta porgradation towards lake centre, paleontological assemblages, SP curves and seismic sections all show the existence of the Linpan delta. The Shanghe deep-water turbidite fan is located in the front of Linpan Delta, irregular oval in shape, smaller in size, the area is about 10-20 km2. The frequent interbeded light grey, greyish brown muddy siltstone, siltstone, fine grained sandstone, and deep grey mudstone constituted a lot of normal rhythms, 0.5-5.5 meters in thickness. The maturity of the sandstone composition is relatively low, the content of quartz 40-60%, feldspar 15-30%, rock fragment 5-25%, clay 10-20%, having mud supported, pore-matrix cementation. The information of grain size shows the characteristic turbidite sedimentation, probability graphs are single line, CM diagram appears segment QR paralleled to C = M base line. The complete incomplete Bouma seqences and many kinds of base prints were developed. The deep and shallow fossils were associated, their types were monotonous and a few in quantity. There are many typical electric loggings and seismic responses of the Shanghe turbidite fan. In order to establish a local facies model quickly and accurately, and play a role in facies studying, to eliminate some artificial influnce, and to favor the dialogue between geologists, in this paper authors used the Markov chain to determine vertical relationship of the sedimentary sequence of the Linpan delta and the Shanghe deep-water turbidite fan and to establish the local facies models. Practice has indicated that the Markov chain is an effective method to establish local facies model, and it is suitable for rhythmical complex stratigraphic sequence. The steps of Markov chain established facies modle are following: 1. Observe stratigraphic section carefully, based on a varity of facies marks, determine facies with different characteristics and their relationship plotted relation diagram of facies change; 2. Count the whole number of facies changes and the number of facies changes from one into another, establish the matrix of facies change number, determine facies change probability of sequence; observed 3. Fix the facies change probability of random sequence; 4. Determine the diffe- rence of facies change probability between the observed and random sequences,
Keywords:
本文献已被 CNKI 等数据库收录!
点击此处可从《沉积学报》浏览原始摘要信息
点击此处可从《沉积学报》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号