确定油田钻井岩心原始方位的古地磁学方法探讨
Paleomagnetism research on orientation of drilling cores in oil field
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摘要: 通过对南泥湾油田钻井岩心部分样品的古地磁学实验分析,表明可以提取并分离岩石在不同地质历史时期所获得的剩磁组分,即次生粘滞剩磁分量(低温分量)与原生沉积剩磁分量(高温分量)。经分析可知,采用以低温分量拟合结果为主,并辅以高温分量拟合结果的方法可以很好的确定钻井岩心原始方位,从而对油田的进一步勘探开发有裨益。Abstract: Paleomagnetic study of drilling cores in Nanniwan oil field shows that it is an effective way to obtain the orientation of drilling cores by picking up and aparting two paleomagnetic remnant components, the lower temperature component and the higher temperature component which were formed in different periods. The viscous remnant component (lower temperature component), which could be easily and concisely gotten in the NRM~150℃ demagnetization period, has been demonstrated to be a good and main factor for orientation. At the same time,the depositional remnant component(higher temperature component)could be easily influenced by many factors and could be a good auxiliary and verified tool for orientation of drilling cores.
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Keywords:
- Nanniwan oil field /
- drilling cores /
- remnant component /
- paleomagnetism /
- extension of sand body /
- Zijderveld fig
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