欧加登盆地H气田含气有利分布区预测

Prediction and Research of Favorable Gas-bearing Distribution Area in H Gas Field of Ogaden Basin

欧加登盆地H气田油气资源丰富,但其勘探程度较低,目前仅有4口井钻遇主力含气储层—Adigrat层,由于储层含气后造成地震波高频能量衰减剧烈、主频降低等影响,依靠完钻井资料和常规地震属性无法完成含气有利区预测工作。针对性地应用了瞬时振幅和瞬时频率属性,从剖面上识别出含气段的储层横向发育状况,同时,还通过对地震资料进行道积分计算的方法得到了相对波阻抗体,并以此为基础数据提取分析了均方根振幅属性,得到了Adigrat层A-Zone2小层的含气有利区平面图,与完钻井吻合程度较高,可为下一步勘探井位部署提供参考依据。

In H gas field of Ogaden Basin,the oil and gas resources are abundant,but its exploration degree is very low. At present,only four wells have been drilled the main gas-bearing reservoir—Adigrat formation,because of the influence of the high frequency energy attenuation and the decrease of the frequency of the seismic wave caused by the gas accumulation in the reservoir. It is impossible to complete the prediction work of the gas-bearing favorable area by means of the drilling data and the conventional seismic attributes. In this paper,the instantaneous amplitude and instantaneous frequency attributes are applied to identify the reservoir＇s horizontal development of gas-bearing formation from the profile,at the same time,the relative P-wave impedance is also obtained by calculating the trace integral of seismic data,and furthermore the root mean square（ RMS） is analyzed to obtain the plan of the favorable gas-bearing area of Adigrat formation A-Zone2,which is highly coincided with drilling data and provides reference for the exploring well deployment.