山东临南地区油气田上方土壤磁性异常特征

Soil magnetic property anomaly signatures over oil and gas field in Linnan area, Shandong Province

1. 地质矿产部物化探研究所, 廊坊 065000;2. 胜利油田管理局勘探公司, 东营 257100

Institute of Geophysical and Geochemical Exploration, MGMR, Langfang 065000

对山东临南油田137．5km2的594件土壤样品的磁性特征进行了分析研究,发现油气田上方磁性异常比较复杂。在本区的土壤磁性异常多表现为高值环带包围低值区块的环带异常,并且见油钻孔多分布在中低值区内,显示土壤磁性异常与油气储集之间存在一定的对应关系,虽然不精确,但大多数见油钻孔分布于土壤磁性异常低位区内。

A study on the magnetic property signatures of 497 soil samples from the Linnan oilfield, Shandong Province with acreage being 137. 5km2 is made. It is found that the magnetic property anomaly over oil and gas field is complex. The anomalies in the area behave most likely as girdle anomalies with low value blocks surrounded by high value annulus, and oil boreholes are frequently distributed over the medium and low value anomaly areas, showing that there is a certain relationship between the soil magnetic property anomaly and the oil and gas accumulation.