摘要
为了剖面的对比,客观的反映构造形态,要将处理后的地震剖面校正到一个基准面上.若基准面在地表上,就要引入一个替换速度的概念,以充填低降速带底界至基准面的介质.从处理的角度讲,基准面静校正量求取的主要误差来自4个方面:①计算方法本身的误差;②基准面的选取方法;③替换速度的误差;④低降速带的各向异性.研究引起静校正误差的原因以及对叠加成像的影响,有助于在静校正计算和静校正应用过程中减小静校正带来的误差,减小这些误差是寻找低幅度构造圈闭,获得高精度地震剖面的关键.
The seismic section acquired by data processing is analyzed by interpreters and converts to geological chart about depth and thickness, which reflects the distribution of various constructions. It needs to proofread the seismic section to a specific level in order to contrast between sections and reflect the shape of constructions. If the datum were higher than the surface, it would use the concept of replacement velocity which replaces velocity of the medium between bottom boundary of low velocity layer and the datum. In theory, wherever the datum is, if knew the model of subsurface structure, we would calculate static correction relative to the datum accurately. However, it is very difficult to do it according the possessed method, especially in the area of complicate subsurface structure model. From point of the data processing, the error when count the static correction relative to the datum mainly come from four sides:①calculation methods itself; ② selection of the datum; ③error from replacement velocity; ④anisotropy of low velocity layer. If we understand these sides, it will be helpful to reduce error which arose by static correction while calculate and apply it, while reduction of the error is the key to find low amplitude structural trap and acquire high precision seismic section. For this reason, the article describes the reasons lead to static correction error and its influence to stack section in detail.
出处
《新疆地质》
CAS
CSCD
2005年第1期79-81,共3页
Xinjiang Geology
