弯宽线采集技术在桂中山区的应用与效果

广西桂中山区喀斯特地形地貌发育,地表条件及地下地质构造复杂多变,大部分为碳酸盐岩直接出露,岩溶、裂缝发育,导致激发及接收条件差、原始资料信噪比低、静校正问题突出,地震波场复杂,构造成像困难。通过攻关试验,宽线观测方法利用相邻道的面元叠加信息,有效压制了各种干扰,剖面品质有较大改善。桂中山区特殊地震地质条件下的弯宽线采集技术,是压制干扰、提高剖面信噪比的有效方法,实际生产应用取得了良好的采集效果,可在类似的低信噪比地区推广。

Application of Crooked Wide-line Seismic Acquisition Technique in Guizhong Mountainous Area

Karst topography is common in Guizhong mountainous area in Guangxi. Near surface and subsurface structure are complex and varied in the area. Most of rock is carbonate rock directly cropping up with development of karst and fractures, causing a number of disadvantages, such as poor conditions for excitation and acceptance, low original signal-to-noise ratio, serious static correction problems and difficult structural imaging. Based the study and experiment, the bin stack information of adjacent gathers is used for wide line survey method and all kind of interference is suppressed effectively while the quality of seismic section is improved substantially. Under the special geological conditions of Guizhong mountainous areas, the crooked wide-line acquisition technique is an effective method to suppress interference and improve the signal-to-noise ratio of seismic section. With good results for acquisition achieved in application, this method can be widely used in the similar low signal-to-noise ratio regions.