| 黏声介质平面波有限差分叠前深度偏移及在莺歌海盆地的应用 |
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| 引用本文： | 李添才,谢玉洪,李列,王华忠,王新领,但志伟,胡江涛.黏声介质平面波有限差分叠前深度偏移及在莺歌海盆地的应用[J].地球物理学报,2014,57(5):1612-1622. |
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| 作者姓名： | 李添才 谢玉洪 李列 王华忠 王新领 但志伟 胡江涛 |
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| 作者单位： | 1. 吉林大学地球探测科学与技术学院, 长春 130026;2. 中海油能源发展股份有限公司工程技术物探技术研究所, 广东湛江 524057;3. 中海油湛江分公司, 广东湛江 524057;4. 同济大学海洋与地球科学学院, 上海 200092 |
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| 基金项目： | 国家重大科技专项子专题“莺琼盆地高温高压区高精度地震资料采集处理技术”(2011ZX05000023004001)资助 |
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| 摘 要： | 莺琼盆地诸探区中存在底劈现象，深层气源产生的气体沿底劈产生的裂隙通道向上漫溢.漫溢过程中，一是充填在遇到的砂体中形成气藏；二是弥漫在上溢通道中，使得通道中的纵波速度发生变化，进而纵波波阻抗差异变小，反射变弱.另外，通道中气体的存在，会加强地层的吸收衰减，使得地震波振幅变弱、高频成分损失导致同相轴分辨率降低.利用OBC数据进行多波地震勘探和利用黏声介质的叠前深度偏移都是改善模糊区成像质量的重要方法技术.为此，本文提出用黏声介质平面波有限差分法叠前深度偏移成像方法改善气体充填区域的成像质量.黏声介质成像目的是补偿地震波的吸收衰减；平面波偏移成像目的是适应海上单炮数量巨大，提高波动方程叠前深度偏移成像的效率；有限差分法叠前偏移的目的是适应该区浅层气分布局域性极强、Q值的空间变化大的情况.在莺歌海某探区的实际数据上的黏声介质平面波有限差分叠前深度偏移试验证明，本方法是改善模糊区成像质量的较为有效的途径.
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| 关 键 词： | 底劈现象 模糊区 黏声介质 有限差分法 平面波叠前深度偏移 |
| 收稿时间： | 2013-02-28 |
Visco-acoustic medium plane-wave finite-difference pre-stack depth migration and its application in Yinggehai Basin |
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| LI Tian-Cai,XIE Yu-Hong,LI Lie,WANG Hua-Zhong,WANG Xin-Ling,DAN Zhi-Wei,HU Jiang-Tao.Visco-acoustic medium plane-wave finite-difference pre-stack depth migration and its application in Yinggehai Basin[J].Chinese Journal of Geophysics,2014,57(5):1612-1622. |
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| Authors: | LI Tian-Cai XIE Yu-Hong LI Lie WANG Hua-Zhong WANG Xin-Ling DAN Zhi-Wei HU Jiang-Tao |
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| Institution: | 1. College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China;2. CNOOC EnerTech-Drilling & Production Co., Development &Prospecting Geophysical Institute, Guangdong Zhanjiang 524057, China;3. CNOOC Zhanjiang Co., Ltd., Guangdong Zhanjiang 524057, China;4. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China |
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| Abstract: | Due to diapir existing in Yingqiong basin, gas flows up along the diapir. The overflow process formed gas reservoirs in the filling sand. In addition, the gas filled in the overflow channel changing the P-wave velocity in the channel, hence the longitudinal wave impedance difference becomes small and reflection weaker. The gas channel in strata will strengthen the absorption and attenuation of seismic wave, so the amplitude is further reduced. Using the data of OBC for multiwave seismic exploration and the visco-acoustic medium pre-stack depth migration is the important method to improve the imaging quality of fuzzy region. Therefore, in this paper visco-acoustic medium plane-wave finite-difference pre-stack depth migration is presented. Visco-acoustic medium imaging is for compensation of seismic wave absorption and attenuation. Plane wave migration imaging is to adapt to the marine data of very large shot number, because single shot gather prestack depth migration efficiency is too low. Finite difference migration is to adapt to Q spatial variation. The test of actual data in Yinggehai area shows that this method is an effective means to improve the imaging quality in fuzzy image areas. |
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| Keywords: | Diapir Fuzzy zone Visco-acoustic medium Finite difference Plane wave pre-stack depth migration |
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