摘要
茅山背斜的4口探井均钻遇泉头组一段三个发育较厚的砂层组,但除梨参1井产工业性气流外,其余3口探井均不产气。为此,利用钻井资料及地震资料追踪了三个砂层组的分布范围。根据含气地层反射振幅随炮检距增加而增大的原理,进行了地震正演模型计算,分析了经过特殊处理后的地震资料。证实本区含气砂岩具有AVO特性显示,并有层速度及平点异常,最后结合钻井资料预测了含气砂岩的分布范围。
Four exploratory wells drilled on Maoshan anticline penetrate three quite thick sand units in the first member of Quantou formation, each unit consisting of several laminae. Every one of the four wells, except well Lican-1, has no industrial gas flow. The distributions of the three sand units were analysed using both drilling data and seismic data. According to the principle that the amplitude of reflection from gasbearing formation increases with the increase of offset, seismic forward modeling was made, and the seismic data were analysed which had been processed using special methods. It was proved that the gas-bearing sand beds in this area not only have the property which is described in AVO technique but also show interval velocity anomaly and dim spot anomaly. The distributions of the gas-bearing sand beds have been ascertained using seismic data and drilling data.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1989年第6期707-716,736,共11页
Oil Geophysical Prospecting
关键词
气藏预测
AVO分析
地震正演模拟
gas reservoir prediction
AVO analysis
seismic forward modeling
