基于相干算法的多尺度体曲率裂缝检测方法研究  

STUDY OF DETECTION METHOD FOR MULTI-SCALE CURVATURE FRACTURES BASED ON COHERENCE ALGORITHM

作　　者：李勇[1] 朱江梅[1,2] 张文璨[1] 何剑[1] 范维[1] 

机构地区：[1]成都理工大学地球物理学院,四川成都610059 [2]中海油能源发展物探技术研究所,广东湛江524027

出　　处：《矿物岩石》2015年第2期107-112,共6页Mineralogy and Petrology

基　　金：四川省科技计划项目(2015JY0093);四川省教育厅科研项目(14ZA0066)

摘　　要：应用地震数据计算的地震曲率是一种重要的地震属性,它与尺度不同的断层和裂缝密切相关。实验建立了在未知层位数据下的一种多尺度体曲率计算新技术,是基于相干算法的曲率联合计算新技术,利用相干算法寻找数据体中某一点与周围相干性最大的其他点形成一个局部曲面,在最小平方意义下进行曲面拟合,并采用窗口技术,再计算曲率就能得到不同尺度的体曲率。这种曲率联合计算技术,具有简单易实现、抗噪能力强和稳定好的特点,避免了层位数据拾取误差带来的影响,是曲率法的一种新发展,能为识别尺度不同的地质结构特征提供丰富信息。利用建立的基于相干算法的曲率联合计算技术,对海上W地区50km2的双方位地震数据进行了曲率计算,获得了T61和T62a储层的最大曲率和最小曲率等,T61和T62a储层的最大曲率和最小曲率等详尽地刻画了T61及T62a储层不同尺度的断层和裂缝以及裂缝对增加裂缝孔隙度的作用,为储层预测提供了丰富的信息。Seismic data are usually used to calculate the seismic curvature, which is closely related to the scale of different faults and fissures. A new technology is proposed to calculate the multi-scale curvature under unknown horizon data,based on correlation algorithm of joint curvature calculation. Using coherence algorithm to look for a specific point in the data cube,together with other coherence points around it, form a local curved surface and under the least square for curved surface fitting. Then,calculated curvature can get the different scales of body curvature by using the window technology. This joint curvature calculation technology has the following characteristics ： It is easy to implement,with strong anti-noise ability and good stability. This technology avoids the effects of error in horizon data. Therefore, it is a new development of curvature method and can provide valuable information to identify the different geological structure features. The above new technology is used to calculate the curvature of the both sides seismic data in W area of 50 km^2 at sea. It obtains the maximum curvature and minimum curvature of the T61 and T62a＇s reservoirs,which are depict in detail the different reservoir scales of fault and fissure, and the role of fissure to increase the fissure porosity. The maximum curvature and minimum curvature provide a wealth of information for reservoir prediction.

关 键 词：曲率 相干算法 断层 裂缝 储层 

分 类 号：P631.34[天文地球—地质矿产勘探]