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第四系生物气勘探是世界天然气勘探领域的难点。柴达木盆地三湖地区第四系地层弱成岩、砂泥岩薄互层及地层普遍含生物气的特殊地质特征,加上地震资料受多种异常的影响,如何开展三湖地区生物气藏的地震含气检测,一直是该地区天然气勘探的一个难点。在分析三湖地区特殊地质及地震异常特征的基础上,经过分析研究,认为利用能量加权瞬时频率属性可以预测三湖地区的生物气藏,并经过钻探得到了证实,为该地区生物气藏的预测提供了一种较为实用的方法。
Quaternary biogas exploration is a difficult area in the field of natural gas exploration in the world. In the Qaidam region of Qaidam basin, the special geologic features of the weak diagenesis, thin interbedded sand-mudstone layers and biogas generally in the strata in the Sanhu area of the Qaidam basin, coupled with the fact that the seismic data are affected by various anomalies, Seismic gas detection has been a challenge for natural gas exploration in the area. Based on the analysis of the special geological and seismic anomaly characteristics in the Three Lakes region, after analysis and research, it is considered that the bio-gas reservoir in the Three Lakes region can be predicted by using the energy-weighted instantaneous frequency attribute and has been confirmed by drilling. Prediction provides a more practical method.