摘要
对比研究纵、横波速度方位各向异性,对确定方位各向异性敏感参数非常重要。利用中国东部某盆地B区深层OVT域道集数据,开展了纵、横波速度各向异性反演,分别得到了对应的各向异性强度和方向。基于横波速度各向异性强度和方向的解释结果与研究区已知井资料揭示的裂隙信息吻合,与区内断裂关系合理,即各向异性强度大的区域附近断裂发育,各向异性方向大致平行于断裂走向;基于纵波速度求得的各向异性强度明显小于基于横波速度求得的各向异性强度,其各向异性方向偏差较大,与区内断裂关系不甚合理,即断裂附近的各向异性强度很小,各向异性方向与断裂并未大致平行或呈锐角相交。因此,横波速度对方位各向异性更敏感,反映的裂隙分布也更可靠。
Comparation of the azimuthal anisotropy of Pwave and S-wave velocity is very important for determining the sensitive parameters to azimuthal anisotropy.Based on prestack gathers in OVT domian in area B,Easten China,anisotropy inversion of P-wave and S-wave velocity was carried out to determine the anisotropic intensity and oritentation.The anisotropy of S-wave velocity is consistent with the fracture data(undeveloped fractures)revealed by known well data,such as logging data,and satisfies the relationship between faults and fractures(where faults are developed near the zone with high anisotropic intensity,and the anisotropic direction is roughly parallel to the fault strike).The anisotropy of P-wave velocity is obviously weaker than that of S-wave velocity,and does not satisfy the relationship between faults and fractures in the area,i.e.the anisotropy intensity is small around the fractures,or anisotropy oritentation is not approximately parallel to the fractures,or the two cross with acute angle.So,it is concluded that S-wave velocity is more sensitive to azimuthal anisotropy and more reliable for fractures prediction.
作者
何峰
龙凡
韩刚
陈晓智
李俊
王焕弟
HE Feng;LONG Fan;HAN Gang;CHEN Xiaozhi;LI Jun;WANG Huandi(CNOOC Research Institute,Beijing 100027,China;Shanghai Borui Energy Technology Company,Shanghai 202150,China;Petroleum Industry Press,Beijing 100029,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2021年第2期289-294,301,I0009,I0010,共9页
Oil Geophysical Prospecting
基金
国家科技重大专项“深层低渗—致密储层改造甜点评价技术”(2016ZX05027-003-003)资助。
关键词
纵波速度
横波速度
方位各向异性
裂隙
弹性反演
椭圆拟合
P-wave velocity
S-wave velocity
azimuthal anisotropy
fracture
inversion of elastic parameters
ellipse-fitting
