基于OVT域地震数据的多尺度裂缝预测方法及应用  

Multi-scale fracture prediction method based on OVT domain seismic data

作　　者：陈秋旭 曹俊兴[1] 苏照东 向韬 付京城 CHEN QiuXu;CAO JunXing;SU ZhaoDong;XIANG Tao;FU JingCheng(Key Laboratory of Earth Exploration and Information Technology of Ministry of Education,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地球勘探与信息技术教育部重点实验室,成都610059

出　　处：《地球物理学进展》2023年第3期1084-1094,共11页Progress in Geophysics

基　　金：国家自然科学基金(41974160,42030812);中国石化勘探分公司科技攻关项目资助。

摘　　要：本文利用OVT域道集,优选出合适的方位角和炮检距信息,结合方位各向异性和地震属性进行多尺度的裂缝精细刻画.针对大中尺度裂缝,使用基于逆向量的梯度结构张量算法求取倾角得到构造信息,由梯度算子计算梯度矢量场并设置指示方向,将梯度矢量场反转进而求取倾角信息;并利用构造导向滤波方法突出同相轴断裂处不连续性特征,计算得到更高精度的构造地震属性,从而进行多属性裂缝大尺度裂缝精细刻画.针对小尺度裂缝,利用方位各向异性特征预测裂缝发育强度以及裂缝发育走向,并结合FMI测井数据综合预测裂缝发育情况.将综合预测方法应用到四川某工区凉高山组砂岩储层裂缝预测中,开展研究区多尺度裂缝精细刻画.应用表明,所提出的方法能够有效的提高裂缝中精细尺度问题,与实际地质情况相吻合.This paper uses the OVT domain gather to optimize the appropriate azimuth and offset information and combine the azimuth anisotropy and seismic attributes to carry out the multi-scale fracture fine characterization.A gradient structure tensor algorithm based on an inverse vector is proposed for large and mesoscale fractures to calculate the dip angle and obtain the structural information.The gradient operator calculates the gradient vector field,sets the indication direction,reverses the gradient vector field,and obtains the dip angle information.In addition,use the structural guided filtering method to highlight the discontinuity characteristics at the fracture of the phase axis and calculate the structural seismic attributes with higher accuracy to characterize the large-scale fractures of multi-attribute fractures finely.For small-scale fractures,this paper uses azimuthal anisotropy to predict fracture development strength and trend and combines the FMI logging data to predict fracture development comprehensively.Apply the comprehensive prediction method to the fracture prediction of sandstone reservoirs in a work area of the Lianggaoshan Formation in Sichuan and characterize the multi-scale fractures in the study area finely.The application shows that the proposed method can effectively solve the problem of fine-scale fractures,which is consistent with the actual geological situation.

关 键 词：OVT域道集 多尺度 逆向量法 方位各向异性 裂缝预测 

分 类 号：P631[天文地球—地质矿产勘探]