逆时偏移技术在八岭山-花园地区的应用

Application of the Reverse Time Migration Technology in Balingshan-Huayuan Area

逆时偏移技术(RTM)是目前最精确的偏移成像技术之一,分为道集优化、速度深度模型建立和炮域叠前逆时偏移三个阶段,通过不断提高叠前道集信噪比和速度深度模型精度,解决研究区断裂及构造内幕反射成像等关键问题。在实际工作中运用稳健地表一致性反褶积、叠前五维数据规则化、逆时偏移成像等最新处理新技术,通过网格层析法速度模型迭代优化建立准确的速度深度模型,逆时偏移成果剖面品质显著提高,断裂及构造内幕的成像效果明显改善。

Reverse time migration （RTM） technology is one of the most accurate migration imaging technology. It can be divided into three stages, which are gathers optimization, the velocity--depth model establishment and shot domain pre--stack reverse--time migration. Through continuously improving signal--to--noise ratio of pre--stack gathers and the accuracy of velocity--depth model, the key problems can be solved such as fractures and tectonic in- side reflection imaging. Our work applies the latest processing technologies, such as solid surface consistent deconvo- lution five--dimension regularization of pre--stack data and reverse--time migration imaging. Through the method of grid chromatography can optimize and establish the velocity--depth model. The reverse--time migration improves profile quality significantly, fractures and tectonic inside imaging is also improved obviously.