模型正演技术在巴中地区须四段主河道砂体识别中的应用  

Application of sand identification from the main channal of the 4th member of Xujiahe formation in BZ area using forward modeling

作　　者：肖伟[1] 王明飞[1] 何志勇[1] 

机构地区：[1]中石化勘探南方分公司,成都610041

出　　处：《物探化探计算技术》2015年第4期488-493,共6页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：巴中地区须四段主要为陆相辫状河三角洲前缘沉积,前人的研究表明,主河道沉积微相是该区须四段高产富集的主控因素之一,但是由于须四段分流河道侧向迁移频繁,纵向上相互叠置,导致地震资料横向变化较大,利用这些资料研究主河道砂体在剖面上展布其可靠性较差。运用模型正演技术,借助该区域三维剖面反射特征,利用已钻井资料提供岩石物理参数,设计地质模型,进而研究和分析模型正演结果,明确了巴中地区须四段主河道砂体的地震响应特征,建立了主河道地震识别模式,在此基础上追踪出主河道砂体的分布范围,取得了较好的应用效果。Forward modeling can be used to indicate the reflection characteristics of geological body, especially in the area where have little wells. The 4th member of Xujiahe formation of BZ area belongs to terrestrial braided river delta front depos- its, including the channel migration frequent lateral and vertical stacked on each other. This leads to greater lateral variation of seismic data. In addition, there have little wells in BZ area. It is unreliable to research distribution of main channel sand using these above materials. In this paper, the geological model is designed firstly with the typical three--dimensional profile in BZ area. The petrophysical parameters are then obtained from wells which have been drilled. The results of forward modeling are finally studyed and analyzed to clear the seismic response characteristics of main channel sand. Based on the above processes, the distribution of the main channel sand is tracked in whole BZ area.

关 键 词：模型正演 主河道 砂体识别 巴中地区 

分 类 号：P631.4[天文地球—地质矿产勘探]