永新地区综合表层调查方法探讨

Discussion on integrative near-surface survey method in Yongxin area.

表层结构调查是一项基础而重要的工作,其调查结果不仅在很大程度上决定了地震采集中激发和接收的方式和因素,而且可为复杂表层结构区提供翔实的静校正处理资料。永新地区高精度地震采集的目的是解决油气开发问题,要求激发子波具有较高主频和较大频宽,因此要精细地做好该区的表层结构调查。本文通过对表层结构不同调查方法应用效果进行对比,分析了不同调查方法的适应性,提出综合应用多种表层调查方法,相互取长补短,形成精细的高密度表层结构调查方法。利用该套方法在永新地区的野外地震数据采集中取得了很好的应用效果,同时为激发、接收因素的制订及静校正等工作准备了基础数据。

Near-surface structure survey is a basic and important work and the results of survey not only determines the shooting and receiving pattern and factors in seismic acquisition to a considerable degree, but also provides complete processing data of static correction for complex near-surface structure zone. The goal of high-precision seismic acquisition in Yongxin area is to solve the issue of oil/gas development, which requires shooting wavelet to have higher dominant frequency and broader band width, so the near-surface structure survey in the area should be well done finely. Through correlation of different survey methods of near-surface structure and their applied effects, the paper analyzed the adaptability of different survey methods, presented integrative application of multiple near-surface survey methods, taking learning from others' strong points to offset one's weaknesses, forming fine and high-density near-surface structure survey method. Using this set of method to field seismic data acquisition in Yongxin area achieved good applied results, and prepared basic data for definition of shooting and receiving factors and for work of static corrections at the same time.