摘要
松辽盆地乾西北地区的下白垩统青山口组—姚家组是吉林油田地震勘探开发的重要目的层段 ,具有湖盆复杂的砂泥薄互层结构 ,以往基于常规地震资料采用常规解释识别这类薄储层有些力不从心。通过在该区实施三维高分辨率地震勘探 ,并以此为基础利用三维时频地震数据体中的频率属性和在时间域的频率方向性变化来识别和划分不同期次的时频层序 ,初步摸索到一套识别和划分砂泥岩薄互层多期时频层序的方法。研究表明 ,时频层序与地层层序之间存在良好的对应关系 ,即地层层序的地震响应在频率上具有方向性 ,不同类型层序的频率具有不同方向特征 ,时频分析剖面上的频率属性分布特征符合地层的沉积规律。据此认为 ,此方法在分析陆相砂泥岩薄互层层序方面有着良好的应用前景。
Lower Cretaceous Qingshankou Formation-Yaojia Formation in northwest Qian area of Songliao Basin is important targets of seismic exploration and development in Jilin Oilfield,having complex thin sandstone/mudstone-interbedded structure of lake basin.Former-used common interpretation methods for identifying the thin reservoirs based on common seismic data have ability falling short of our wishes.We begun to explore a set of the methods for identifying and dividing thin sandstone/mudstone interbedded multi-period tim-e-frequency sequences after finishing 3-D high-resolution seismic exploration in that area and using frequency attribute and directional change of frequency in time domain of 3-D time-frequency seismic data volume to identify and divide the time-frequency sequences in different periods.The studied results showed that there exists the good corresponding relation between stratigraphic sequence and time-frequency sequence,that means,the seismic response of stratigraphic sequence has directivity in frequency,the frequency of different type's sequence has different directional character,the distributed feature of frequency in time-frequency analysis sections conforms to sedimentary regularity of formations.It considered in view of the above that the method has good application prospect in the aspect of analyzing thin sandstone/mudstone interbedded sequence of continental facies.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2004年第6期730-738,共9页
Oil Geophysical Prospecting
