基于时频电磁法的富有机质页岩层系勘探研究

我国地质条件复杂、多样,能否充分发挥出非地震勘探技术成本低、效率高的技术优势,检验电法勘探技术在页岩气勘探中的有效性,是当前在页岩气勘探起步阶段亟待解决的重要问题之一.本文介绍了在研究和总结含气页岩密度、极化率、电阻率等岩石物理特征基础上,在四川盆地南部筠连地区开展的物性调查、时频电磁法勘探试验工作.勘探研究结果表明,本地区分布的富有机质页岩层系-志留系龙马溪组(S1l)具备开展电法勘探工作的物性条件,时频电磁法具有勘探富有机质页岩层系的能力.

A study of exploration organic rich shales using Time-Frequency Electromagnetic Method (TFEM)

China's Geological conditions are complex and various. Verifying the availability of electric exploration technique as well as exerting the high efficiency and low cost of non-seismic technique's advantages are the important issues at present shale gas exploration. This paper introduces the study and summarize of petrophysical characteristics of gas bearing shales such as density, rate of induced polarization, resistivity, etc, the shale gas exploration using time-frequency electromagnetic method in Junlian of southern Sichuan Basin. Our exploration results prove that the organic rich shales of Longmaxi formation (S1l) of Silurian has the proper physical properties could be used for electromagnetic method exploration. Time-Frequency Electromagnetic Method(TFEM)is an effective exploration technology for shale gas in this region.