基于改进的相干体分析技术的裂缝发育带预测研究

Prediction of fracture development zones based on improved coherence analysis

准确合理的裂缝带预测,对油气田勘探开发起着至关重要的作用。这里从准确预测裂缝发育带的角度出发,以提高断裂带的平面连续性及精细刻画小尺度裂缝发育带的平面展布特征为目标,提出了一种基于改进的相干体分析技术的裂缝发育带预测方法。该方法首先基于大网格相干数据体设定距离因子,将研究区域分为邻近断层区域(裂缝带较发育)和远离断层区域(裂缝带较不发育);再针对小网格相干数据体,根据分区结果进行自适应滤波处理:在邻近断层区域进行反距离加权构造导向滤波,远离断层区域进行中值滤波。将该方法应用到某研究区裂缝带预测,结果表明,方法不仅有效地压制了噪声,并保留了断层、裂隙等边缘细节信息,使断裂展布特征更加清晰,成像质量更好。

Accurate and reasonable fracture zone prediction plays an important role in oil and gas field exploration and development.From the point view of accurate prediction of fracture development zone,this paper aims at improving the plane continuity of fault zone and characterizing the plane distribution characteristics of small scale fracture development zone.A prediction technique of fracture development zone based on improved coherence analysis is proposed.Firstly,the research area is divided into adjacent fault area(highly developed fracture zone)and far from fault area(less developed fracture zone)based on the distance factor of large grid coherent data body.The method is applied to the prediction of fracture zone in a research area,and the results show that the method not only effectively suppresses noise,but also retains detailed information on the edges of faults and fractures,so that the fracture distribution features are clearer and the imaging quality is better.