反射地震层析成像在海洋天然气水合物储层识别中的应用

发布时间：2018-01-31 16:19

本文关键词： 天然气水合物反射走时层析成像走时拾取正则化归一化　出处：《地球物理学进展》2017年01期 　论文类型：期刊论文

【摘要】：海底地层速度结构是识别海洋天然气水合物储层的直接依据,本文应用地震反射走时层析成像建立了海底地层速度模型.采用不规则网格对模型进行离散化,使速度单元与反射界面单元完全耦合;利用基于不规则单元波前扩展和走时插值的射线追踪方法,精确确定反射射线路径和反射波走时;在反演中同时使用先验约束、平滑约束、归一化和正则化技术,提高了层析反演的稳定性和结果的可靠性.对南海北部神狐海域SH2井附近的二维地震测线资料,利用多域人机交互法拾取了反射走时,用反射走时层析成像方法获得了SH2井附近含水合物目标区的速度结构.该反演结果与测井声波速度和钻探结果一致,其中的高速带对应水合物储层,表明反射走时层析成像能够有效地得到海洋天然气水合物储层的速度结构,为海洋天然气水合物储层识别提供依据.
[Abstract]:The velocity structure of undersea strata is the direct basis for identifying marine gas hydrate reservoirs. In this paper, the seismic reflection travel-time tomography is used to establish the model of undersea formation velocity. The model is discretized by irregular grids. The velocity unit and the reflection interface unit are fully coupled; The ray tracing method based on irregular element wavefront spreading and traversing interpolation is used to accurately determine the reflected ray path and the reflected wave travel time. Prior constraints, smoothing constraints, normalization and regularization techniques are also used in inversion. The stability of tomography inversion and the reliability of the results are improved. For the two-dimensional seismic line data near SH2 well in Shenhu sea area in the north of the South China Sea, the reflection travel time is picked up by multi-domain man-machine interaction method. The velocity structure of hydrate target area near SH2 well is obtained by reflection time tomography. The inversion results are consistent with the logging acoustic velocity and drilling results, and the high velocity zone corresponds to the hydrate reservoir. It is shown that the velocity structure of marine gas hydrate reservoir can be effectively obtained by reflection time tomography, which provides the basis for the identification of marine gas hydrate reservoir.
【作者单位】：海底科学与探测技术教育部重点实验室中国海洋大学海洋地球科学学院;青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室;青岛海洋地质研究所;
【基金】：中国地质调查局国家海洋地质专项(GZH201100308) 国家自然科学基金项目(41230318,41074077)联合资助
【分类号】：P631.46;P618.13
【正文快照】： 1.海底科学与探测技术教育部重点实验室,中国海洋大学海洋地球科学学院,青岛2661002.青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,青岛2660613.青岛海洋地质研究所,青岛2660711.Key Lab of Submarine Sciences and Prospecting Techniques of Ministry

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