Abstract: During exploration and production, the discovery of oil and gas reserves can be considered to be the result of 2D seismic work, 3D seismic work, and well exploration. When the contribution of exploration to reserves discovery is measured, an oilfield in China is selected as a case. A regressive model is established, taking the proved reserves as dependent variables and the exploration obligation as independent variables. Besides, the other regressive model is established, taking the exploration obligation as dependent variables and the 2D and 3D seismic work as independent variables. On the basis of the regression coefficient obtaining from the two models, the contribution rate of 2D and 3D seismic work is measured and calculated comprehensively. The contribution rate of exploration obligation to reserves discovery can be seen as the basis for making investment decisions and deploying work in oilfields

Key words: oil and gas reserves, 2D seismic, 3D seismic, well exploration, regressive model