四川碳酸盐岩区地震横波分裂与各向异性

S-WAVE SPLITTING AND ANISOTROPY IN CARBONATE AREAS OF SICHUAN

四川石油管理局地质调查处,南充637000

Geology survey division, Sichuan Petroleum Administration, Nanchong 637000

各向异性及横波分裂的研究对预测裂缝型储层、油气流向、注水方向等都有十分重要的意义.笔者根据四川碳酸盐岩区实际地震资料上不同方向横波速度的不同与能量分裂,证实了横波分裂的存在,由此可推断地下介质的裂缝分布.并通过纵、横波的速度旅行时交会图和各向异性系数剖面对该区碳酸盐岩储集层的各向异性进行了初步研究.

It's of great significance to study thd anisotropy and S-wave splitting in predicting fracture-type reservoirs, oil / gas flow andccwatcr injection directions. The author has shown the presence of S-wave splitting in the light of the vclocicy disparity and the energy splitting in different directions in a set of real data from Sichuan carbonate areas, which thereby results in the inference regarding the fracture distribution in the earth. In addtion, a preliminary analysis on the anisotropy feature of the carbonate reservoir in this area is conducted on the basis of P-and S-wqvcs'velocity-travel crossplots and anisotropy coefficient profiles.