柴达木盆地盐泥结晶区激发技术

Chaidamu basin salt mud crystal region excitation technique

柴达木盆地诺木洪地区是重要的生物气勘探区域,已发现5个天然气田,属于高产高丰度大型气田,目的层较深,得好该区的地震资料是该地区气田开发的重要基础.该区地表分布大片盐沼区,按照以往激发井深设计方法在高速层中激发,单炮质量低,得不好深层资料.经过对该区近地表结构的仔细分析调查,发现该区经过长期交替沉积作用,近地表形成多套盐泥互层,反复多达4～5层,表现在微测井记录中是高速层并不是单一结构,高速层顶界面下有多套强反射界面,按照以往的方法在高速层顶界面下激发,地震波被大量屏蔽在这多套盐泥交互层中,经过对井深的优化,设计到盐泥交互层之下激发,所得资料效果较好.

Chaidamu Basin Nuomuhong region is an important biological gas exploration area,belongs to the high abundance of large gas field,layer is deep,well seismic data in this area is an important base for oil and gas development in the region.The surface distribution of large salt marsh areas,in accordance with the micro logging data interpretation of the near surface structure is explained,and the depth of the well in the top field excitation,the single shot of poor quality,low signal-to-noise ratio of the deep.After a detailed investigation of the near surface structure and origin,found the area after a long alternate deposition,near surface formation of multiple sets of salt mud interbed,repeated as many as 4-5layer,in the micro logging record is high speed level is not a single structure,with multiple sets of strong reflection interface of the top,so in accordance with previous methods in the top surface of high velocity layer under excitation,seismic wave by a large number of shielding in salt mud interaction layer of the multiple sets of the above,through the optimization of well depth,excitation well depth design under salt mud interaction layer excitation,the data is better.