川西坳陷须家河组气藏DR技术应用

川西坳陷须家河组气藏属于深层陆相致密碎屑岩气藏，具有致密、低孔低渗、薄层交互、多层叠置和非均质性强的特点，长期以来，勘探成功率低、效益差。为此，有针对性地开展了须家河组气藏含气性检测技术应用研究，形成了基于地震波散射理论的DR（Dynamic Register，动态频谱能量异常）含气性检测技术，DR值大，说明地震资料的主频衰减率高、速度异常大，储集层可能富含天然气。该技术在川西坳陷须家河组气藏勘探开发中取得了很好的应用效果，含气砂岩储集层具有DR值高异常特征。但在实际应用DR含气性检测技术时，要注意储集层厚度不能太小，一般需大于地震剖面上能够分辨的最小储集层厚度，否则就会出现假DR值高异常现象。图2参10

Application of DR (Dynamic Register) technology in T3x gas reservoirs in West Sichuan

The T3x gas reservoirs in the depression of West Sichuan is the deep continental tight clastic rock gas reservoirs with the characteristics of tight, low permeability, thin interbed, multi-layer nappe, and high heterogeneity. Aimed at the problems of difficult oil & gas prospecting and low profit in the reservoirs, the DR (Dynamic Register) technology, a seismic technology for detecting oil and gas, is developed based on scattering of seismic waves. A big DR value means that the seismic data has a high decay rate of dominant frequency and an abnormally high speed, indicating a high probability of rich gas in the reservoir. The technology only applies to the reservoir whose thickness is bigger than the minimum reservoir thickness identifiable in the seismic section. The technology is successfully used in the T3x gas reservoirs.