摘要
以往的地震速度分析大致分为两个彼此独立的部分:第一部分是静校、相关处理和速度谱,均以提高成像质量为目的;第二部分是解释、速度分析和成图,均以获取地质成果为目的。本文介绍的模型速度建场法则是把上述两部分结合起来进行一体化综合分析,采用三维静校空间场、射线追踪和模型迭代等方法,再结合三维速度场最终完成构造图,速度精度显著提高。本方法在准噶尔盆地盆5井地区应用效果很好。
The former seismic velocity generally is divid-ed into two separately independent parts : the first part mainly is static corrections, coherent process-ing and velocity analysis,which all takes improving imaging as a goal; the second part is to interpret the velocity analysis and mapping, which takes ob-taining the geologic results as a goal. The velocity-field model-building method introduced by the paper is to combine the above-mentioned two parts together to carry out integrative analysis. using spatial field,ray tracing and modei iteration of 3-D static corrections and combination with 3-D veloci-ty field to finish structural map, greatly improved the velocity precision. The method has been used in P5 well zone,Junggar basin,and discovered struc-ture with amplitude 40m and area 42km2,which is oil-bearing structure proved by P5 well. On 2-D seismic structural map,the structure did not exist; and on 3-D t0 isogram,only the trap with about amplitude 5ms is discovered.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2003年第6期675-679,共5页
Oil Geophysical Prospecting
