大庆油田长垣浅层气藏处理中的关键技术及应用

The Key Technology for Processing Shallow Gas Reservoirs in Daqing Changyuan Oilfield and Its Application

在大庆油田萨尔图、高台子工区的地震资料处理过程中发现,静校正问题对浅层气藏的影响尤为突出,覆盖次数在面元内采样高度不规则,导致CRP(共反射点)道集能量差异。采用模型层析组合静校正技术消除静校正引起的构造假象问题,得到高信噪比的叠加剖面,更真实地反映地下构造形态;利用叠前数据规则化技术使CRP道集近道弱能量的假AVO(振幅随偏移距变化)现象得到有效压制,有效解决偏移距不同造成的覆盖次数分布不均问题。研究成果可以在大庆油田长垣推广应用。

In processing the seismic data in Sa'ertu and Gaotaizi Work Areas of Daqing Oilfield,it was discovered that the influence of static correction for shallow gas reservoirs was serious,the bin sample height was irregular,it resulted in energy difference in CRP(common reflection point)gathers.A combination of model tomographic static correction technology was used to eliminate structural deceptive problem induced by the static correction,a stack section with high signal-to-noise ratio was obtained for more truly reflecting the underground structural shape,aprestack data regularization technique was deployed for effectively suppressing the weak energy of fake AVO(amplitude versus offset)of CRP gathers to effectively solve the problem of uneven fold distribution induced by different offsets.The research results can be popularized in Daqing Changyuan Oilfield.