消除直流电阻率三极梯度法中各种干扰的实验与研究
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摘要
通过对直流电阻率三极梯度法中各种畸变干扰的实验与分析，采用公式计算，可把高阻油气藏从构造起伏、地形起伏及浅（表）层不均匀体的强大干扰中最大限度地突出出来、式中：Ga为油气藏埋藏于低阻岩层中的有限延伸的高阻地质体所引起的有效异常；P和P，分别为欧计算Ga的异常曲线和参照曲线在k测点处的视电阻率值。这意味着该方法已具备实用的必要条件，不仅可在地质情况比较简单的平原地区，而且可望在地震勘探比较困难的地区，对油气藏进行预测，确定其边界、高点、顶底埋深以及对油气藏进行开发监测等。
By using the formulaafter analysing various noises in DC resistivity trielectrode gradient measurement,we can easy highlight high-resistivity hydrocarbon reservoir in the strong noisebackground that results from structural undulation, landform undulation and shal-low nonuniform body. In the formula, Ga means effective anomaly due to a finitehigh-resistivity geologic body (reservoir) in low-resistivity formations, P and Pare respectively the apparent resistivities at k points of the anomaly curve for whichGa curve needs to be plotted and of reference curve. This method is feasible. It canbe applied to both reservoir development monitoring and reservoir prediction (de-termination of boundary, top depth and bottom depth of a reservoir) in plain andmountainous district where seismic exploration is difficult.
By using the formulaafter analysing various noises in DC resistivity trielectrode gradient measurement,we can easy highlight high-resistivity hydrocarbon reservoir in the strong noisebackground that results from structural undulation, landform undulation and shal-low nonuniform body. In the formula, Ga means effective anomaly due to a finitehigh-resistivity geologic body (reservoir) in low-resistivity formations, P and Pare respectively the apparent resistivities at k points of the anomaly curve for whichGa curve needs to be plotted and of reference curve. This method is feasible. It canbe applied to both reservoir development monitoring and reservoir prediction (de-termination of boundary, top depth and bottom depth of a reservoir) in plain andmountainous district where seismic exploration is difficult.
引文
1张天伦.井中有套管情况下用直流电阻率法确定油气藏边界的实验与研究.石油地球物理勘探,1993,28(3):314～324
2张天伦.使用线电极供电的直流电阻率法预测砂岩构造型油气藏的实验与研究.石油地球物理勘探,1994,29(3):337～347
2张天伦.使用线电极供电的直流电阻率法预测砂岩构造型油气藏的实验与研究.石油地球物理勘探,1994,29(3):337～347
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