任丘潜山油田的基本地质特征及其形成的大地构造背景

任丘油田位于渤海湾盆地的冀中坳陷内。冀中坳陷地壳自太古代以来,在漫长的地质时期中,大体上经过了三个大的发展阶段。1.前地槽及地槽发展阶段:在前震旦亚代(绝对年龄约36.7—17亿年),经过阜平、五台和中条运动,形成了本区的古老基底。据少数钻井资料,它为一套深变质的花岗片麻岩,与周边太行山等地对比,相当于太古代阜平群或桑干群。

TYPICAL FEATURES AND GEQTECTONIC BACKGROUND OF THE FORMATION OF THE RENQIU BURIED-HILL OILFIELD

The Renqiu buried-hill oilfield is one of the large and Prolific oilfields in China discovered in the middle of 1970s. This type of oilfields was formed in a specific geotectonic background, which have their distinctive characteristics, and is a klnd of oil-formation assemblages of so-called "younger oil accumulated in older reservoirs",i.e. Cen-ozoic oil generated in geosag stage emplaced into older sub-Sinian and Paleozoic carbonate reservoirs formed in platform stage well developed with fractures and caverns. The pools have a variety of forms and are distributed regularly, resulting in the occurrence of multiple oil and gas accumulation zones. This paper discusses emphatically the formation of the oilfield in light of the geotectonic background, which provides informations significant to the search of oil and gas.