The Palaeozoic petroleum geological condition of Huabei area had been analyzed in detail from the petroliferous system angle.
从油气系统角度分析了华北区古生界的石油地质条件。
The production effects and action mechanism of applied EM biological-organic fertilizer to winter-wheat and summer-maize under the typical cropping systems of the Huabei area in china were analyzed.
本实验是在十年研究的基础上，在华北地区小麦—玉米典型耕作制度下，对土壤长期施用EM生物有机肥，研究其对冬小麦和夏玉米的生产效果与作用机理。
Tangshan city is the typical karst-cranny developing area in Huabei region which is shallowly covered up.
唐山市是华北地区典型的岩溶裂隙发育浅埋地区。
During the Upper Paleozoic in Huabei there were 3 main times of sea level eustacy which caused different deposits in research area.
华北晚古生代经历了3次大的海平面升降旋回，不同海侵事件在研究区内留下了不同的沉积纪录。
For the first time, the Huabei Oil Fields exploited the deep subsurface water below 400 meters in the centre area of Hebei during the middle of 70s.
七十年代中期，华北油田于冀中地区首次开发了400米以下深层地下水。
Jinxian depression is a major exploration area of Huabei Oil field in the recent years.
晋县凹陷近几年一直是华北油田勘探的主攻战场。
Jinxian depression is a major exploration area of Huabei Oil field in the recent years.
晋县凹陷近几年一直是华北油田勘探的主攻战场。
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