摘要
鄂尔多斯盆地大牛地气田二叠系下石盒子组盒3段属于辫状河道沉积,地震属性及反演预测受地震分辨率限制以及上覆的上石盒子组底砂岩的影响,造成河道砂岩储层预测的多解性。该文在高分辨率层序地层格架控制下,通过合成记录对比及地震反射特征剖析,归纳出盒3段顶界面地震反射波T9f的4种地质含义,在此基础上,应用波形地震相分析方法,通过地震相、测井相及沉积相综合研究,较好地预测出辫状河道沉积微相展布及河道砂岩发育的有利区。在大牛地气田D66井区的砂岩预测结果中与实际钻探吻合率达90%。由此表明,以沉积相、沉积特征约束下的波形地震相划分,能实现对复杂地质体的准确预测和描述。
The reservoirs of the third member of Permian Shihezi Formation in Daniudi Gasfield in Ordos Basin are braided channel sediment. The reservoir prediction of channel sand is uncertain because of seismic resolution and overlying sandstone of upper Shihezi Formation. Under the constraint of high resolution sequence stratigraphic framework, and based on the comprehensive analysis of synthetic seismogram and seismic reflection characteristics, it is recognized that there are four geologic implications of seismic reflected wave T9f at the top surface of the third member of Shihezi Formation. The waveform seismic facies analysis method combining with comprehensive study on seismic facies, electrofacies and sedimentary facies are applied to predict the sedimentary microfacies distribution of braided channel and favorable areas for channel sand development. The prediction result has a consistent rate of 90% with the actual data in D66 well field. So the waveform seismic facies constrained by sedimentary facies and sediment features can be used to accurately predict the complex geologic body.
出处
《岩性油气藏》
CSCD
2011年第2期90-94,132,共6页
Lithologic Reservoirs
基金
中国石化勘探开发研究院科技项目(编号:G5800-09-ZS-HX013)"大牛地气田开发准备区选区评价及开发准备井建议"资助
关键词
高分辨率层序地层
河道砂岩
波形地震相
测井相
沉积相
大牛地气田
鄂尔多斯盆地
high resolution sequence stratigraphy
channel sand
waveform seismic facies
electrofacies
sedimentary facies
Daniudi Gasfield
Ordos Basin
