川东北通南巴灰岩地区地震勘探采集技术探讨

Seismic data acquisition in Tongnanba limestone area northeast of Sichuan

中国石化中原石油勘探局物探公司,河南濮阳 457001

Geophysical Exploration Company, SIN-OPEC ZPEB, Puyang 457001, China

川东北通南巴灰岩地区表层结构复杂,地震波场混乱,构造成像困难。针对该问题,①进行了激发井深试 验,试验结果表明在高速层激发效果较好;②研究了灰岩区含水条件下使用不同炸药类型的激发效果,在该区使 用高能炸药可以提高激发能量;③基于地质模型进行了观测系统设计研究,并探讨了不同观测系统的实际应用 效果,根据该区实际地质地震条件设计观测系统为3640-60-(20)-60-6040不对称观测系统;④进行了灰岩 激发条件试验,采用水泥、清水和稠泥3种方式封井,清水封井对提高激发效果有明显作用。将上述方法应用于 实际地震资料采集中,地震剖面的品质得到了较大的改善。

Combined the analysis of the surface of structure, shot and receive discussed on limestone outcrops area in northeast of Sichuan. According to theory analysis and test data, it had studied the effect of differing dynamite at the limestone area containing water; the application effect of varies geometry by geology model in practice. Some available ways to improve shot condition and some design ways for complex structure are put forward. Desired results were yielded by adoption of these measures in data acquisition.