广域电磁法在辽西地区牛营子凹陷油气资源潜力评价中的应用

The application of wide field electromagnetic method to the oil and gas exploration of Niuyingzi sag in Liaoxi area

将广域电磁法应用于辽西地区牛营子凹陷中元古界碳酸盐岩推覆体覆盖区,取得了良好的效果。首次在该地区发现隐伏于碳酸盐岩推覆体之下的厚层北票组烃源岩地层,并得到钻孔验证;揭示了该区侏罗系北票组地层相对于上、下地层显示为低阻的特性,获得了地下电性体真实的电阻率特征;丰富了燕辽沉降带东部的勘探层系,将该地区原有的中新元古界单一勘探层系拓展为中新元古界黑色碳酸盐岩地层和中生界北票组泥岩两套油气勘探层系。

The authors applied the wide field electromagnetic method to conducting work in Mesoproterozoic carbonatite nappe area and achieved good result. It is for the first time that Beipiao source formation was discovered below the carbonatite nappe, which was further proved by well cores. It shows low resistance in comparison with things of its adjacent layers. The actual electronic resistance of underground electric body was also obtained. These discoveries have enriched the exploration strata of the east Yanliao subsiding belt and expanded one Mesoproterozoic exploration stratum to two exploration strata, i.e., the Mesoproterozoic black carbonate stratum and mudstone stratum.