第四纪沉积物磁性勘查油气法的原理及应用

本文介绍了利用第四纪沉积物磁性调查油气的原理,地下油气藏会在近地表第四纪沉积物中产生磁性矿物并形成多种磁性参量异常。检验了形成磁性异常的磁性矿物的种类;发现了油田地区土壤中存在着趋磁细菌。在5个油田地区近450km²范围应用该方法调查油气分布的研究结果表明,各种磁性异常(κ、Mn、Mr、Ir、Iκ)呈综合异常的形式,它们的形成及分布特征受油气活动、通道及环境条件的控制。实际资料证实,磁性综合异常能反映油田地区油气活动的分布状态。该方法作为综合勘查方法之一,应进一步推广。

THE PRINCIPLE AND APPLICATION OF MAGNETIC OIL AND GAS EXPLORATION IN QUATERNARY SEDIMENTS

This paper elucidates the principle of applying magnetism of Quaternary sediments to the oil and gas investigation: underground oil and gas accumulations would produce magnetic minerals and form various magnetic parameter anomalies in near-surface Quaternary sediments. Types of magnetic minerals forming magnetic anomalies were identified, and it has been found out that there exist magnetotaxis bacteria in soils of oil fields. The application of this method to the investigation of oil and gas distribution in areas of nearly 450 km² within five oil field shows that various magnetic anomalies (κ、M n、M r、I r and I κ) assume forms of composite anomalies, with their formation and distribution characteristics controlled by oil and gas activities, channelways and environmental conditions. Data available demonstrate that magnetic composite anomalies can reflect distribution of oil and gas activities in oil fields and that, as one of the integrated prospecting methods, the method should be further spread.