Law and mechanism of reservoir parameters change both before and after waterflooding in Gangdong Development Area

In order to explore the microscopic change laws of reservoir both before and after waterflooding to guide the oilfield production and development,the reservoir parameters are analyzed on the basis of core data of early exploratory well and inspection well in the middle and later stages of oilfield development.The theory of reservoir geology and development geology is used to study the change laws of reservoir parameters both before and after waterflooding in Gangdong Development Area.The research result indicates that the secondary intergranular pores develop well and the large intergranular pores are increased.The pore diameter and throat of moderate coarse sandstone are enlarged,but the pore diameter and throat of siltstone are decreased.The porosity-permeability property of reservoir is improved,shale content is decreased and median grain diameter is decreased for channel sand.The reservoir wettability is changed towards water wetting.Laboratory experiment study shows that the porosity and permeability of core sample are improved to a certain extent after flooding.The study results are helpful for the establishment of production measures at the later stage of oilfield development.