斜井与水平井双侧向测井响应的影响因素分析

在直井中,双侧向测井仪所发出的电流面与地层裂缝面之间的夹角,等于地层中裂缝面的倾角。对于水平井和斜井而言,该夹角不等于地层裂缝倾角。由于对双侧向测井响应产生影响的是该夹角,不是地层中的裂缝倾角,所以水平井和斜井的双侧向测井响应可能会出现"假象"。本文得出这两角之间的联系,进而阐明水平井和斜井的双侧向测井曲线响应有时会出现"假象"的原因,并且认为仅根据水平井和斜井的测井响应无法判断裂缝倾角范围,还需要结合其他测井资料。

ANALYSIS OF INFLUENCING FACTORS ON DUAL LATEROLOG RESPONSE IN DEVIATED WELLS AND HORIZONTAL WELLS

In vertical wells, the included angle between the fracture surface and the current surface emitted by DLT( dual laterolog tool) is equal to the inclination of the fracture surface. But it is not the same in horizontal wells and deviated wells becuase it is the included angle between fracture surface and current surface, not fracture inclination that affects the dual laterolog response. This paper gives out the relationship between these two angles. The cause of the " false impression " in horizontal wells and deviated wells is illuminated in it. And it suggested that we cannot judge the range of fracture dip in horizontal wells and deviated wells only from the log response but also from other logging data.