【摘要】：隨鉆方位電阻率儀器在大斜度井、水平井中測量時會受到地層電阻率各向異性的嚴(yán)重影響。隨鉆方位電阻率儀器旋轉(zhuǎn)測量時,可得到地質(zhì)信號和各向異性信號。文章采用數(shù)值仿真方法計算地層各向異性對儀器測量信號的影響。計算結(jié)果表明,相位差地質(zhì)信號會隨著地層各向異性系數(shù)的增大而減小,而幅度衰減地質(zhì)信號隨著各向異性系數(shù)的增大而增大。兩種地質(zhì)信號均會隨著相對傾角的增大而增大。相對傾角較大時,地質(zhì)信號峰值對應(yīng)地層界面的位置。在均勻地層,各向異性信號為零,在各向異性地層中,幅度比各向異性信號隨著相對傾角、各向異性系數(shù)的增大而增大。
[Abstract]:While drilling the azimuth resistivity instrument in high inclination wells and horizontal wells will be seriously affected by the anisotropy of formation resistivity. Geological and anisotropic signals can be obtained when the resistivity instrument rotates with drilling azimuth. In this paper, numerical simulation method is used to calculate the influence of formation anisotropy on the measured signal. The results show that the phase difference geological signal will decrease with the increase of the anisotropy coefficient, while the amplitude attenuation geological signal will increase with the increase of the anisotropy coefficient. Both geological signals increase with the increase of relative dip angle. When the relative dip angle is large, the peak value of geological signal corresponds to the position of the stratigraphic interface. In homogeneous formation, the anisotropic signal is zero. In anisotropic formation, the amplitude ratio anisotropic signal increases with the increase of relative dip angle and anisotropy coefficient.
【作者單位】： 中海油田服務(wù)股份有限公司;
【分類號】：TE927
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本文編號：2123212