摘要
在准噶尔盆地腹部夏盐3井区存在时间域与构造域高低幅度差异大的问题。基于存在的问题,前期研究对该地区进行三维叠后重新处理和利用三维速度建模变速构造成图,为夏盐5井的钻探提供了决策依据。钻探后发现,夏盐5井构造高点并不存在,造成这些现象的原因是该地区构造复杂、地震速度横向变化大,常规叠后时间偏移不能使反射波正确归位,需要使用三维叠前深度偏移技术才能实现复杂目标区的高精度成像。研究指出速度建模是关键,并给出了相应的速度建模对策。解决了该地区构造深度与地震双程时间不一致的矛盾。为随后钻探的井提供了地质依据。
There existed a problem of big difference from high extent to low extent on time domain and tectonic domain in Well Xianyan 3. Based this problem, after the pre-research was carried on 3D poststack processing and a three-dimensional velocity model was used to build a variable velocity structure map, by which bases was provided for drilling the Well Xianyan 3 . After drilling, it was found that structural height of Well Xianyan 3 was not existed. The reason was that the structure was complicated, lateral change of seismic velocity was big and conventional poststack time migration could not make the reflective wave correctly migrate. It is pointed out that velocity stack is the key and a responding velocity modeling measure is provided, by which the disagreement of structural depth and dual seismic time in the area is solved,basis is provided for consequent well drilling.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2009年第2期59-62,共4页
Journal of Oil and Gas Technology
基金
中国石油新疆油田分公司重点科技攻关项目(2006204)资助
关键词
地震成像
地质解释
静校正
速度建模
叠前深度偏移
准噶尔盆地
Junggar Basin
seismic imaging
geological interpretation
static correction
velocity modeling prestack depth migration
