【摘要】 大港油田浅层气是指埋深在400～1 500m之间的气层,生产中存在气层规模小、气层能量不足、难以识别等问题。应用地震油气检测技术较好地解决了以上难题,取得了良好的效果,主要包括:应用以弹性介质模型为基础的叠前检测技术,采用AVO方法建立正演模型,对大港地区三维地震资料进行处理,根据AVO异常相应特征进行含气预测,指示出具有较好含气特征的砂岩分布区;应用以黏弹性介质模型为基础的能量吸收分析技术,对极浅层开展了浅层气检测与横向预测,气层亮点特征明显,预测出2个潜在的含气区;应用地震属性气层预测方法,发现平均能量属性对研究区内气层反映较为敏感,由此确定出研究区的气层平面展布规律。通过地震信息储层含气性预测技术的应用,预计新增浅层气储量为(50～60)×108 m3,筛选出目标区块10个,已被作为大港油田下一步产能建设的首选目标。更多还原

【Abstract】 Dagang Oilfield shallow gas reservoir is referred to those with burial depth lower than 400-1500m.Problems exist such as small scale,insufficient gas reservoir energy,and difficult to to be detected.Seismic hydrocarbon detection technology can solve the above problems and achieved good results.Using the pre-stack detection technology which is based on elastic medium model,adopting AVO method to build the forward model,the 3-D seismic data from Dagang District are processed.Gas-bearing prediction has been done according to the AVO anomaliesand it demonstrates the distribution of sandstone with good gas-bearing propert.With the energy absorption analysis technology which is based on the viscoelastic medium model.Shallow gas detection and lateral prediction of very shallow strata have been carried out.The gas highlight characteristics are remarkable.Two potential gas-bearing areas are predicted.With the prediction of seismic attribute gas layer,it is found that the average energy attribute is sensitive to the reaction of gas layer in the study area,and thus determined the plannar distribution of gas reservoirs in the study area.Via the application of the earthquake information reservoir gas-bearing prediction technology,it is expected that there will be 5-6 billion cubic meters of newly added shallow gas reserves.10 target blocks have been screened out and used as a preferred target for future production capacity construction.更多还原