Abstract: Development of the Renqiu off field started in 1976.It is an oil field of buried-hill type,with oil contained in reservoirs in the Wumishan formation of Sinian but generated from the overlying Paleogene which serves both as a source rock and a cap rock.The Wumishan formation,totalling 2,100 meters thick,is a suite of dolomites with fractures and intergranular pores.The reservoirs,crisscrossed with faults and fractures,have a unified pressure system and oil-water contact.Wells are cased to tile top of the reservoirs and completed barefooted.Producers are high-yielding,with daily production per well reaching several hundred to thousand tons.Thanks to the good intercommunication in the reservoirs,the low natural energy in the reservoirs is compensated for by means of water-flooding from the bottom for pressure maintenance.For three years since its appliration,pressure and oil production have been kept constant.Observation wells are drilled in the different parts of the structure to watch oil and water movement in the various stages of development.However,testing in production and injection wells reveals that severe heterogeneity of physical properties of the reservoirs exisits in parts of the oil field,which will certrinly complicate prediction of reservoir performances and make it difficult for us to control oil and water movement.

摘要： 任丘油田位于华北盆地冀中拗陷的中部,自1965年开始钻探,当时主要目的层是下第三系,至1972年仅在几口探井中获得少量油流,没有大的发现.此后加强了地球物理勘探工作,发现了第三系覆盖下的深部地质构造(图1),并部署了一些较深的探井.