济阳坳陷浅层气藏地震识别技术应用研究

The Application Research of Shallow Gas Reservoir in Jiyang Depression Seismic Identification Technology

济阳坳陷浅层气藏地震响应特征多样。由于真假亮点及非亮点气藏的存在,使得地震"亮点"技术存在局限,无法精确检测真亮点及非亮点气藏。为此,通过改进技术方法,探索了适合济阳坳陷浅层气藏勘探开发的地震识别技术。针对几种不同类型的含气层,以岩石物理分析为基础,进行正演模拟,分析不同类型含气层的叠前道集响应特征。以地震正演模拟为基础,计算弹性参数,筛选储层敏感参数。利用叠前地震直接反演方法,获取叠前地震敏感参数。应用叠前地震直接反演的敏感参数检测济阳坳陷浅层气藏,能够较好地检测出亮点气藏和非亮点气藏,提高了浅层气藏的检测精度。

The seismic response of shallow gas reservoir in Jiyang Depression is variety. As the existence of true or false bright spot and non-bright spot gas reservoirs, the seismic ＂bright spot＂ technique has limitations, it can not accurately detect true bright spot and non-bright spot gas reservoirs. Consequently, through improving technolo- gy and methods, the seismic recognition technology suitable shallow gas reservoir in Jiyang Depression exploration was explored. For several different types of gas layer, based on petrophysical analysis, simulation analysis, analy- sised different types of gas layer prestack gathers response characteristics are carried out forward. On this base, cal- culating the elastic parameters, filtering reservoir sensitive parameters, the pre-stack seismic sensitive parameters were obtained using pre-stack seismic direct inversion method. Shallow gas reservoirs in Jiyang Depression using pre-stack seismic direct inversion sensitivity parameters are detected, the bright spot reservoir and non-bright spot reservoir can be better detected, improving the detection accuracy of shallow gas reservoirs.