高分辨率地震勘探关键措施论述

以松辽盆地北部高分辨率勘探试验资料为基础,对其精细构造勘探中需注意的几个重要环节进行了系统的研究,并在某些环节上得出了与常规地震相悖的观点,如：应兼顾激发能量和频带宽度确定激发层位与药量;应根据勘探目的层的深浅,选择不同自振频率的检波器,检波器以多串少并方式连接,更有利于记录高频信号;在信号记录方面,提出应根据模/数转换器位数对频宽的影响程度选择低切;另外指出是否采用高分辨率地震勘探的依据是高频信息在浅层的衰减程度、目的层的物性条件及目的层的层数。针对施工中容易出现问题的环节,提出了应采取的措施,根据目前高分辨率地震勘探现状,提出未来需进一步攻关的方向。

A Discussion on Key Measures of High Resolution Seismic Prospecting

Based on northern Songliao Basin high resolution seismic prospecting test data, systematically studied some major links in precision structural prospecting need to be paid attention to. Some viewpoints obtained arc contrary to conventional seismic prospecting in some links. Such as： shot position and charge quantity should give attention to both shot energy and bandwidth; according to target depth select geophones with different self-sustained oscillation frequency, connection of geophones ought to more in series than in parallel, thus all the better to record high frequency signals; on signal recording, ought to based on A/D converter digits impact extent on bandwidth to select low muting; in addition, basis of high resolution seismic prospecting adoption is attenuation extent of high frequency information, target physical property condition and target number. In allusion to links easy to have problems in operation, advanced measures should be adopted, based on high resolution seismic prospecting status quo, put forward future key problems further tackling orientation.