基于双相介质油气检测方法在塔东GC地区的应用

Application of Hydrocarbon Detection Method Based on Double-phase Medium in GC area,East of Tarim Basin

针对塔东GC地区Y3段白云岩储层非均质性强的特点,在双相介质理论的基础之上,利用油气藏典型的双相介质特性,以及地震波经过储集层时"低频共振、高频衰减"的动力学特征来预测GC地区Y3段含气有利区的分布范围。该技术对给定时窗内的数据进行频谱分析,根据频谱特征确定低频和高频敏感段,认为敏感段内的能量变化与油气富集程度有关,并且将低频段与高频段能量的比值作为油气富集程度的指示标志,高值区即是可能的油气富集区。利用此方法预测GC地区Y3段的含气有利区,对井符合率达到80%以上,提高了GC地区Y3段的气藏预测精度。

According to the characteristics of strong heterogeneity of dolomite reservoir in Y3 section of GC area in east of Tarim Basin,based on the theory of two-phase medium,the distribution range of favourable gas bearing areas in Y3 section of GC area is predicted by using the typical two-phase medium characteristics of oil and gas reservoir and the dynamic characteristics of"low frequency resonance and high frequency attenuation"when seismic wave passes through the reservoir.The technology carries out spectrum analysis on the data in a given time window,and determines the low-frequency and high-frequency sensitive bands according to the spectrum characteristics.It is considered that the change of energy in the sensitive section is related to the degree of oil and gas enrichment,and the ratio of energy in the low and high frequency sections is regarded as an indicator of the degree of oil and gas enrichment,and the high value area is the possible area of oil and gas enrichment.Using this method to predict the favourable gas bearing area of Y3 member in GC area,the coincidence rate of wells is more than 80%,which improves the prediction accuracy of Y3 section in GC area.