论文部分内容阅读
本文利用土壤剩余磁性作为确定烃类渗漏带的参考系。由于地磁场是个地心偶极子场，磁倾角的大小与纬度呈函数关系，因此磁倾角作为确定烃类渗漏带的参考坐标，具有全球性的意义。在一个地区，同一地层的磁倾角是一定的，可作为磁性分析研究的“标准”，如化深中的“标准样”。当烃类渗漏带存在时，天然剩磁的倾角与经磁清洗后的剩余磁化的倾角将偏离成土时期地磁场的磁倾角，黏滞剩磁的倾角也偏离“0”值；当不存在也不经受烃类作用时，天然剩磁与磁清洗后的剩余磁化的倾角均应趋于成土时期地磁场的磁倾角，黏滞剩磁的倾角也趋于“0”。在廊坊—固安凹陷和临南油田的实验结果表明，选用该参考系是有应用价值的。
In this paper, the residual magnetism of soil is used as the reference frame for determining hydrocarbon seepage band. As the geomagnetic field is a geocentric dipole field, the magnitude of the dip angle is a function of latitude. Therefore, it is of global significance to determine the dip angle of hydrocarbon dipole as a reference coordinate. In one area, the magnetic dip of the same formation is constant and can be used as a “standard” for magnetic analysis studies, such as “standard samples”. When the hydrocarbon seepage zone exists, the dip of natural remanence and the remanent magnetization after magnetic cleaning will deviate from the dip of magnetic field of earth-forming period, and the inclination of viscous remanence also deviates from the value of “0” When there is neither hydrocarbon nor hydrocarbon, the remnant magnetization inclination of natural and magnetic cleaning should be close to the magnetic dip angle of magnetic field in the period of geomagnetism, and the inclination of viscous residual magnetism also tends to “0”. The experimental results in Langfang-Gu’an Sag and Linnan Oilfield show that it is of value to choose this reference system.