任丘古潜山油田的发现与地质特点

Discovery and geologic characteristics of Renqiu Oilfield with buried hill

在冀中坳陷内继冀门1井后所钻冀参4高断块上的任4井、于1975年发现了任丘油田,这是我国最大的海相碳酸盐岩潜山高产油田。油田为一古潜山复式油气聚集带,由蓟县系雾迷山组、寒武系府君山组、奥陶系马家沟组和亮甲山组3个古潜山油藏及古潜山上覆的下第三系(古近系)沙河街组和东营组油藏构成。油源为上覆的下第三系(古近系)沙河街组,具独特的"新生古储"的油藏地质特点。

Renqiu Oilfield is one of the largest high productive marine carbonate fields in China,and it was found in 1975 following the successful drilling of Well Ren 4 which was located in the crest of Block Jican 4.The field is a complex buried hill hydrocarbon accumulation belt and is composed of three buried hill reservoirs including Wumishan Formation（Jixian System）,Fujunshan Formation（Cambrian）,Majiagou and Liangjiashan Formation（Ordovician） and Palaeogene reservoirs including Shahejie Formation and Dongying Formation developed in the drape traps above the buried hill.Active source rocks are mudstones developed in overlying Shahejie Formation of Palaeogene.The field has the geologic characteristics of oil generated in the younger strata but accumulated in the older reservoirs.