大比例尺高精度航空磁测在黄骅坳陷区油气勘探中的应用

位于渤海之滨的黄骅坳陷盆地是我国重要的油气产区之一。随着勘探程度的不断深入,关于中一基性火山岩的控油问题已经引起石油地质工作者的高度重视。新近在黄骅坳陷中部地区完成的大比例尺高精度航磁测量成果,又清晰反映出与油气关系密切的隐伏火山岩形态及其不同的分布特点。在孔家庄—徐家堡一线以北火山岩异常以二度及似二度异常为主,表明火山岩沿断裂呈带状分布,南部则以等轴状异常为主,它们主要为火山岩锥引起,揭示出区内的地质构造特征存在着明显差异。这些成果将对该区油气资源评价及勘探具有重要意义。

THE ROLE PLAYED BY LARGE-SCALE HIGH-PRECISIONAEROMAGNETIC SURVEY IN THE OIL-GASEXPLORATION OF THEHUANGHUA DOWNWARPING AREA

The Huanghua downwarping basin is one of the important oil-gas areas inChina. With the deepening of exploration work, the oil-controlling role ofintermediate-basic volcanic rocks has aroused great interest among petroleumgeologists.The results obtained recently in the large-scale high-precision aero-magnetic survey over the central part of the Huanghua downwarping areaalso clearly show shapes and different distribution characteristics of concealedvolcanic rocks related intimately to oil-gas. North of the Kongjiazhuang-Xuji-apu line, anomalies of volcanic rocks are mainly two-dimensional ones, indica-ting the zoned distrlbution of volcanic rocks along fractures. To the south,however, there are mainly isometric anomalies produced primarily by volcaniccones. These facts suggest that there exist obvious differences in geological-structural characteristics of this area. These outcomes are of great significancefor evaluation of oil-gas resources in this area.