Evaluation Technology Research On Reserves In Qinjiatun Oilfield

The purpose of this paper is to generally evaluate the oil&gas reserves of the qinjiatun oil field, especially the reserves which have not been explored. It's very important because the development blocks of this oil field have entered the exploration adjusting period, the water content are continually increasing and it's very hard to keep the stablization of oil production. In this paper, synthetically using seismic, geological, logging measures and so on, the writer classfies the strata, explains the structures, builds the models of sedimentary and studys the characteristics of reserves. Since comprehensively evaluate the reserves, it is more credible to increase the velocity of oil production and recovery ratio,as well as keep the stablization of oil production. There are several characters in qinjiatun oilfield as below:Firstly, the development of qinjiatun structure experiences three stages:fault-depression stage depression stage and depression shrinking stage.The tectonic movements in the final stage of denglouku formation is the qinjiatun structure's formative stage,while the ones in the final stage of nenjiang formation is its complete period.Secondly,the faces of qinjiatun oilfrield contains alluvial fan, braided delta and lacustrine faces. It's on the edge of braided delta front, it's in the deep part of the water body in quan-1 member and xiao-1 member period, where the hydrodynamic is considerably strong, and gernally weak.Thirdly, using dynamic data, the writer finishes four attributes's relation plate, makes certain the boundary of oi1-gas.Compared with the primitive plate, time difference baseline respectively increases from 230μs/m and 245μs/m to 255μs/m and 255μs/m in the quan-1 member and the xiao-1 member.Fourthly,on the base of confirming the reservoir calculation parameters, the writer primitively retry each unit's proved reservoir. At last, it makes sure that the proved reservoir of the whole qinjiatun oilfrield is 483×10~4tons, among which produced reservoir is 347.7×10~4tons.Fifthly,the writer assesses the unproduced reservoir blocks about the reservoir engeering and economic.And make sure that this part can be produced recently.Sixly,give the reason why some unproduced reservoir blocks are cancelled after the vertification. The main reason is that the changes of the standard of the oil, gas, water layer leads to the changes of reservoir's oilness explain and reduction of oilness area, reservoir effective thickness.Lastly, arranging the further assess work for unsured reservoir blocks, make sure to confirm the real reservoir and well productivity.