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六十年代以来,国外测井技术朝着为实现更大的探测深度的方向发展,新的测井方法不断涌现,从而使人们有可能去探索和认识离井眼较远的地下情况。 1964年,美国试验成功了井下重力测井仪。它可以在套管中测量密度,比地层密度测井仪的探测深度大10倍左右。由于它的探测范围大,排除了套管、井眼不规则以及钻井中岩石受到破坏等因素对测量结果的影响。井下重力测井可以较有效地探测地下构造(如盐丘、致密岩石裂缝的分布),求解孔隙度以及划分油气层。1978年,美国Amoco公司采用井下重力测井仪寻找老油田的死油区,探测半径达到200米。
Since the 1960s, with the development of foreign logging technology in the direction of achieving greater exploration depth, new logging methods are emerging constantly, making it possible to explore and recognize the underground conditions farther away from the wellbore. In 1964, the United States successfully tested the downhole gravity logging tool. It measures the density in the casing, about 10 times greater than the depth of the formation density tool. Due to its wide range of detection, the impact on the measurement results is ruled out by factors such as casing, irregularities in the borehole, and damage to the rock in the wellbore. Downhole gravity logging can effectively detect the underground structure (such as the distribution of salt domes and dense rock fractures), solve the porosity and divide the oil and gas layers. In 1978, the Amoco Company of the United States used a downhole gravity logging tool to find the dead oil zone of an old oilfield with a detection radius of 200 meters.