弹性波有限元逆时偏移技术研究

THE STUDY OF FINITE ELEMENT REVERSE-TIME MIGRATION FOR ELASTIC WAVE

改善弹性波有限元逆时偏移剖面的质量是目前该方法面临的难题，为此，首先在有限元方程中，合理地加入边界力项，并找到准确的成像条件，以及对炮集资料用惠更斯（Huygens）原理消除直达波和面波干扰等措施，提高了复杂含油气结构的偏移剖面质量．本文重点研究单分量资料弹性波偏移的可靠性，利用单分量、抽炮集资料，模拟实际资料处理典型含油气构造，得到了高质量的自激自收和炮集资料的偏移剖面．

The improvement of the finite element reverse time migration section for elastic wave is one of the very important problems, therefore we developed some studies,such as:put the boundary terms into the finite element equtions, find the exact images condition and remove the direct wave and sun'ace wave by using Huygengs' principle.The migration section for complex oil and gas structure has been improved. Proved the reliability of the elastic wave migration using single component data. In this paper,we obtained the perfect migration section for some typical oil and gas layers by modelling field data processing.