海相碳酸岩山区地震勘探方法与效果

SEISMIC EXPLORATIOI TECHNIQUE AND ITS PAYOFF IN MARINE CARBONATE MOUNTAIN AREA

1. 西南石油地质局○五工程处;2. 地矿部石油海洋地质局

本文主要以实例介绍中国西南部贵州省碳酸岩裸露山区油气地震勘探工作的方法技术和实用效果。 此区山峦起伏,地形高差大,地下构造复杂。地震测线部署成弯曲测线,使用了可控震源非线性扫描技术进行数据采集;资料处理则用精细的静校正、谱均衡、二维滤波和连续切除扫描等处理方法。所获结果突出了深、浅层反射波,提高了反射剖面信噪比,清楚地反映出地层构造特征,从而解决了碳酸岩山区地震反射方法技术上长期存在的难题。

This paper illustrated with examples deals with the technique adopted and substantial result achieved with regard to seismic prospecting for oil/gas in the carbonate-exposed mountain area of southwestern Guizhou Province, China.Topographically , the prospect area is characterized by undulating hills, great difference in elevation and complex subsurface structures. The seismic line is zigzaggedly laid out.The data acquisiton is-performed using VIBROSEIS of Non-Linear Sweep Technique. The data processing technique applied include the fine Static Correction, Spectrum Equalization, 2-D Filtering, Continuous Muting Sweep etc, As a reseelt, the deep as well as shallow reflections are standing out; The S/N ratio of reflection section is enhanced; and one could tell the characte-risfics of formational structure easily at first sight, thereby the long-standing hard nut of seismic reflection technique in carbonate mountain area has been cracked.