柴达木盆地某油气聚集区电性结构研究

柴达木盆地某油气聚集区地质条件复杂，地震勘探效果不明显。 在该区布设了 5 条广域电磁法测线，采用 2 n 序列伪随机信号发射源和广域电磁法油气目标识别技术，研究了该区电性结构特征。 结果表明，该区存在 5 个主要电性层，产气层为高电阻率特征，产气层反演电阻率是非产气层的 2 倍以上。 反演
结果与钻井及地震资料对比证明，广域电磁法对油气层识别较有效。 由于施工简单，成本低，广域电磁法有一定的推广应用价值。

Study on electric structure in a hydrocarbon accumulation area,Qaidam Basin

The geological conditions in a hydrocarbon accumulation area of Qaidam Basin are complex, and the seismic exploration effect is not obvious. By applying wide field electromagnetic method, this paper conducted field experiment with five survey lines and studied the electric structure of the study area by a continuous periodic 2ⁿ sequence pseudo-random signal. The results show that five main electric layers exist and the gas layers perform relatively high electrical resistivity. The inversion resistivity values of the gas layers are two times more than that of non-gas layers. Comparing with the well drilling and seismic data, the wide field electromagnetic method is effective for oil and gas identification. Due to the simple field work and low costs, the value of wide field electromagnetic method is tremendous in popularization and application in Qaidam Basin.