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本文介绍在日本地热区进行的一次井间地震试验,其目的在于综合运用地质结果和水力学信息确定井间详细的火山岩构造,从而鉴别裂隙带。实验中还研制了一种先进的三分量多级井下接收器。这种新的接收器能承受高温条件,在温度高达260℃(500F)的情况下能够正常接收。由井间试验获得的速度层析成像与VSP和地面地震数据的反射成像相比具有高得多的分辨率,而且井间层析成像的绝对值完全与声波测井数据一致。两井之间的平均差只是5％左右。我们认为井间速度结构代表了两井之间岩性的变化。这一结果鼓励我们在地热勘探中运用井间地震方法。
This paper presents a cross-well seismic test conducted in a geothermal area in Japan with the purpose of identifying detailed volcanic structures between wells using geological results and hydraulics to identify rift zones. The experiment also developed an advanced three-component multi-level downhole receiver. The new receiver can withstand high temperature conditions, in the case of up to 260 ℃ (500F) to be able to receive normally. Velocity tomography obtained from interwell experiments has a much higher resolution than reflection imaging of VSP and terrestrial seismic data, and the absolute value of cross-well tomography is completely consistent with acoustic logging data. The average difference between the two wells is only about 5%. We think the crosswell velocity structure represents the change in lithology between the two wells. This result encouraged us to use cross-well seismic methods in geothermal exploration.