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井筒钻开程度会严重影响哈萨克斯坦Aksai市的Karachaganak油田碳酸盐岩地层中密度数据的获取,而在油田开发中有效孔隙度的确定是十分关键的。发生在180°相位上的钻开(即钻开平面与最小应力方向平行)在声波和电阻率成像测井图的井眼中很容易识别,图中显示的整个钻开井段的不正确的高密度孔隙度表明密度极板是在一个不规则的钻开凹槽中进行探测的。最初用来解决这个问题的方法是在整个仪器串底部,在与有源密度极板垂直方向上放置第二个不带放射性源的密度装置,其目的是打开底部卡钳并将无源极板锁定在凹槽处,使得有源仪器可以读取整个射开层段坚硬的岩层数据。这种方法的问题是显而易见的,即当出现相反的情况且有源密度极板被锁定在钻开凹槽上时,还是会发生相同的错误。目前解决钻开孔隙度问题的方法是在两个仪器中放入放射源,在相隔90°处瞬时记录密度数据。其结果是在不考虑仪器的方位情况下该方法能够从坚硬岩层中获取有效密度数据。在完成最初的密度数据采集之后,其他相关信息的获取就显而易见了。Karachaganak油藏的孔隙度分布有些复杂,大多数很特别;带有硬石膏和致密的石灰岩堵塞为多孔的白云岩。双密度测井与成像测井结合,能够给出这些岩性各向异性区域的较好的估测孔隙度。
The degree of wellbore drilling will seriously affect the acquisition of density data in carbonate formations of the Karachaganak oil field in Aksai, Kazakhstan, and the determination of effective porosity in oilfield development is crucial. Drilling (ie, parallel to the direction of minimum stress) that occurs at a phase of 180 ° is easily identified in the wellbore of acoustic and resistivity imaging logs, with the incorrect height of the entire wellbore section shown Density porosity indicates that the density plate is probed in an irregularly drilled groove. The initial solution to this problem was to place a second, non-radioactive source densitometer at the bottom of the entire instrument string perpendicular to the active density plate with the purpose of opening the bottom caliper and locking the passive plate At the notches, the active instrument can read hard rock formation data throughout the shot. The problem with this method is obvious: the same error occurs when the opposite situation occurs and the active density plate is locked in the drilled groove. The current solution to the problem of drilling open porosity is to place a radioactive source in both instruments and record the density data instantaneously at 90 ° intervals. The result is that the method can obtain effective density data from hard rock formations regardless of the orientation of the instrument. Once the initial density data has been collected, the acquisition of other relevant information is readily apparent. The porosity distribution of the Karachaganak reservoir is somewhat complicated, most of which is quite special; blocks with anhydrite and dense limestone are porous dolomites. The combination of dual-density and imaging logs gives a good estimate of porosity for these lithologically anisotropic regions.