A Study On The Interpretation Of Flooded Reservoir In Dawa Oil Field

This thesis mainly does some study on flooded reservoir interpretation in Dawa oilfield,as one quarter of L oilfield.Dawa oilfield’s reservoir condition is very complicated, getting into waterflooding development in early stage, and its groundwater resistivity change is unusual. As water content increases quickly after injection development, there is a huge different in waterflooded situation when injected water advance in ground. Curves response differently,resulting in difficult interpretation with regular logging methods. This thesis does considerable research on water flooding mechanism to guarantee follow-up interpretation work, which basing on geological characteristics.Response regular pattern of various logging curves, change of gradient and geological characteristics in different waterflooded situation are summarized and put into a database.And then, basic interpretation units are divided according to specific characteristics of deposited sand body. With builded model of spatial interpretation, oil layers waterflooded changing direction can be determined, in accordance with change tendency of logging data and Kalman filter gain, which means qualitative judge of waterflooded level finished.After qualitative judge of waterflooded level, all reservoirs parameters are achieved in modified double formation water resistivity model with multiple iterative recursion. When all being done, Dawa oilfield interpretation work is finished.Data of 2 coring wells are processed and interpreted with the method in this thesis and coincidence rate reach 73.18% compared with fruits from core analysis data.