CAJ | 학술논문

川东北复杂山地由于地表高程变化大、风化层厚度不均匀、低降速带速度横向变化大、高速层底界不稳定等因素,得到的地震资料具有严重的静校正问题,因此,如何解决山地静校正问题是后续地震资料处理的关键之一,本文首先分析高程静校正、折射静校正、层析静校正的基本原理和适用条件,结合实际复杂山地三维地震资料的特点,进行试验对比,提出了进行山地静校正的基本思路,即:首先进行高程静校正,这样可以利用高程静校正更容易拾取初至时间,然后利用折射静校正结合微测井等资料建立近地表速度-深度模型,以此速度-深度模型作为层析静校正的初始模型进行迭代处理,最后得到最终的近地表速度-深度模型和静校正值.根据以上处理流程,我们建立了适合于川东北山地三维复杂地袁地震资料的静校处理正方法,并在实际生产过程中取得了良好的效果.
천동북복잡산지유우지표고정변화대、풍화층후도불균균、저강속대속도횡향변화대、고속층저계불은정등인소,득도적지진자료구유엄중적정교정문제,인차,여하해결산지정교정문제시후속지진자료처리적관건지일,본문수선분석고정정교정、절사정교정、층석정교정적기본원리화괄용조건,결합실제복잡산지삼유지진자료적특점,진행시험대비,제출료진행산지정교정적기본사로,즉:수선진행고정정교정,저양가이이용고정정교정경용역습취초지시간,연후이용절사정교정결합미측정등자료건립근지표속도-심도모형,이차속도-심도모형작위층석정교정적초시모형진행질대처리,최후득도최종적근지표속도-심도모형화정교정치.근거이상처리류정,아문건립료괄합우천동북산지삼유복잡지원지진자료적정교처리정방법,병재실제생산과정중취득료량호적효과.
Because of sharp variations in elevation,weathering layer thickness and the near-surface velocity in CDB hilly areas,seismic imaging always suffers from great statics problems.We first analyze the theories and conditions of some typical solutions,such as the elevation static correction,refraction static correction,and tomography static correction.Comparing different resuhs of CDB data,a new flow of static correction in mountain areas is proposed.As the first step,elevation statics correction is applied;and the first-breaks on the elevation-corrected shots are picked interactively.The original velocity-depth model for tomography is established by means of refraction static correction.The optimum velocity-depth model and static correction are achieved sucessfully.