南阳凹陷高精度三维地震采集观测系统设计

High resolution 3-D seismic survey design in Nanyang depression

(1.中国地质大学(北京)，北京100083；2.河南油田分公司勘探事业部，河南南阳473132；3.中国科学院地质与地球物理研究所，北京100029)

China University of Geosciences (Beijing), Beijing 100083, China

南阳凹陷主要勘探目的层埋藏较深，断裂发育、构造破碎，现有地震资料的信噪比和分辨率不能满足油气勘探需求。为此，针对南阳凹陷的地震地质条件，结合地震波动方程模拟、照明分析以及观测系统采集脚印分析等技术，在兼顾各项采集设计要求与工作效率的条件下，重新设计了三维地震观测系统。实际应用结果表明，采用上述观测方法获得的地震资料质量较原资料有明显的改善。新采集的资料剖面断裂系统成像清晰，目的层及其以上各反射层特征清楚，分辨率和信噪比均有较大的提高。

The exploration targets of Nanyang depression is characterized by deeply buried depth and well developed fractures, making the S/N ration and resolution of the current seismic data not able to satisfy the requirement for oil-gas exploration. Aiming at the seismic and geologic conditions of Nanyang depression and taking the acquisition design acquirements and working efficiency into consideration, we redesigned, in combination with the seismic wave equation modeling and the illumination analysis and acquisition footprint analysis, 3-Dseismic survey system for Nanyang depression. The actual application results show that the data quality acquired by the above observation method has been obviously improved. The fracture system of the newly acquired profiles images clearly, the characteristics of targets and the reflection layers above them are clear, and the resolution and S/N largely improved.