Predicting horizontal velocities from well data

被引:3
作者
Andrea, M
Sams, MS
Worthington, MH
King, MS
机构
[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT GEOL, LONDON, ENGLAND
[2] PETRONAS RES & SCI SERV, HULU KELANG 54200, SELANGAR, MALAYSIA
[3] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT EARTH RESOURCES ENGN, LONDON, ENGLAND
关键词
D O I
10.1046/j.1365-2478.1997.410274.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Imperial College borehole test site consists of four boreholes with depths lying between 260 and 280m. The boreholes intersect several cyclical sequences of sandstones, mudstones and limestones. The formations are highly laminated and ultrasonic measurements on preserved core have shown that the mudstones are intrinsically anisotropic. Little or no anisotropy is associated with the sandstones and limestones. A scheme is proposed to predict synthetic vertical and horizontal P- and S-wave logs. Combining (an)isotropic effective medium theories, the Gassmann equation and Backus averaging, the scheme extends previous sand-shale models to transversely isotropic rock formations. The model assumes that the anisotropy is due to layering and due to the preferred horizontal orientation of the clay minerals, pores and cracks within the mudstones. The pores and cracks within the sandstones and limestones are randomly orientated. After fitting the model to the ultrasonic data to obtain the unknown parameters, the model successfully predicts the sonic log and the direct arrival times from a cross-hole survey.
引用
收藏
页码:593 / 609
页数:17
相关论文
共 24 条
[1]   LONG-WAVE ELASTIC ANISOTROPY PRODUCED BY HORIZONTAL LAYERING [J].
BACKUS, GE .
JOURNAL OF GEOPHYSICAL RESEARCH, 1962, 67 (11) :4427-&
[2]   DEPENDENCE OF ELASTIC PROPERTIES OF A POROUS ROCK ON COMPRESSIBILITY OF PORE FLUID [J].
BROWN, RJS ;
KORRINGA, J .
GEOPHYSICS, 1975, 40 (04) :608-616
[3]   RELATIONSHIPS BETWEEN COMPRESSIONAL-WAVE AND SHEAR-WAVE VELOCITIES IN CLASTIC SILICATE ROCKS [J].
CASTAGNA, JP ;
BATZLE, ML ;
EASTWOOD, RL .
GEOPHYSICS, 1985, 50 (04) :571-581
[4]   THERMAL-CONDUCTIVITY AND WELL LOGS - A CASE-STUDY IN THE PARIS BASIN [J].
DEMONGODIN, L ;
PINOTEAU, B ;
VASSEUR, G ;
GABLE, R .
GEOPHYSICAL JOURNAL INTERNATIONAL, 1991, 105 (03) :675-691
[5]  
Gassmann F., 1951, Vierteljahrsschr. Naturforsch. Ges. Zur., V96, P1, DOI DOI 10.1190/1.9781560801931.CH3P
[6]   EFFECTS OF POROSITY AND CLAY CONTENT ON WAVE VELOCITIES IN SANDSTONES [J].
HAN, D ;
NUR, A ;
MORGAN, D .
GEOPHYSICS, 1986, 51 (11) :2093-2107
[7]  
HILL R, 1952, P PHYS SOC LOND B, V65, P396
[8]   ANISOTROPIC EFFECTIVE-MEDIUM MODELING OF THE ELASTIC PROPERTIES OF SHALES [J].
HORNBY, BE ;
SCHWARTZ, LM ;
HUDSON, JA .
GEOPHYSICS, 1994, 59 (10) :1570-1583
[9]  
King M. S., 1988, CANADIAN J EXPLORATI, V24, P110
[10]   VELOCITY ANISOTROPY OF CARBONIFEROUS MUDSTONES [J].
KING, MS ;
ANDREA, M ;
KHANSHIR, MS .
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS, 1994, 31 (03) :261-263