影响构造形态的原因分析及解决思路——以准噶尔盆地泉1井区三维地震资料为例

Analysis of the influence factors on structure shape and solutions:case study of the 3-D seismic data in Quan1 well area,Junggar Basin

(中国石油天然气股份有限公司新疆油田分公司勘探开发研究院地物所,新疆乌鲁木齐830013)

Zheng Hongming,Institute of Geophysics,Research Institute of Exploration and Development, Xinjiang Oilfield Company,PetroChina,Urumqi 830013,China

复杂地区的地震勘探往往由于处理中时深转换速度难以准确获得等原因而导致构造形态畸变,圈闭难以落实。结合理论模型，从影响构造成图精度的基准面静校正和时深转换速度入手,详细剖析了复杂地表静校正方法带来的误差,分析了静校正后的地震波场并不等效于在给定基准面上激发的地震波场以及造成时距关系产生畸变而影响地震速度精度的原因。在此基础上总结了复杂构造带来的地震速度偏差导致构造形态畸变的原因,同时给出了解决问题的思路和方法。

In the area with complex geologic conditions,the structural distortion is often caused by seismic data processing and time-depth conversion velocity which cannot be acquired exactly,so it is difficult to ascertain traps.Starting from datum static correction and time-depth conversion velocity,combined with theoretical models,we probed the error resulted from surface static correction method in detail and analyzed the reason that seismic wavefield after static correction is not equivalent to seismic wavefield shot at given datum and the cause of affecting the accuracy seismic velocity resulted from the distortion of time-distance relation.On the basis,we concluded the reasons of structural distortion caused by seismic velocity deviation coming from complex structures.Meanwhile,the clue and method for solving the problems were proposed.

10.3969/j.issn.1000-1441.2012.01.010