三维叠前同步反演技术在番禺天然气区的应用

Application of 3D prestack simultaneous inversion to Panyu Gasfield

(中海石油(中国)有限公司深圳分公司研究院,广东广州510240)

Research Institute,Shenzhen Branch,CNOOC Energy Technology & Services Co.Ltd.,Guangzhou 510240,China

珠江口盆地番禺—流花天然气区PY35-2目标区储层复杂,利用常规技术手段很难准确预测储层的含油气性。为了有效识别储层、提高勘探成功率,在精细分析该地区储层岩石物理特征的基础上,采用三维叠前同步反演技术识别储层及其流体性质。研究结果表明,密度属性能够很好地识别PY35-2目标区主要储层,并且反演结果能够很好地区分含气储层和含水储层,降低了勘探风险。利用叠前同步反演技术得到的密度异常平面分布图预测该地区有利的上钻目标,验证井实钻结果证实了预测结果准确、有效。

The reservoir characteristics of PY35-2 area of Panyu-Liuhua Gasfield in Pearl River Month Basin are complex,it is difficult to predict gas-bearing area by conventional technologies.To effectively identify reservoir and improve exploration success rate,based on detailed analysis on the petrophysical characteristics,3D prestack simultaneous inversion was used to identify reservoir and its fluid properties.The result shows that the density can recognize the main reservoir of PY35-2 area.Meanwhile,the inversion result can well distinguish gas reservoir and watered reservoir,and decrease the risk of exploration.The obtained anomaly plane distribution of density was used to predict the favourable drilling target in the area,which was proved by the well deployed by the prediction result.