Shengli Oilfield Low-grade Reserves Classification And Potential Evaluation Methods

In China a large number of low-grade reserves are not used, the trend of rising oil prices and increasing domestic oil supply and demand contradiction prominent, so to speed up the development of low-grade reserves are becoming increasingly important. But the current low-grade reserves classification and evaluation methods have some shortcomings. The thesis takes Shengli oilfield low-grade reserves as the main research object, and puts forward a set of the low-grade reserves classification and grading methods according with domestic reality. Aimed at original method deficiency specifically, the study research the low-grade reserves evaluation method having built economic limit forms tong and marginal cost method, make use of research method to have appraised the low-grade reserves scale of Shengli oilfield currently, the countermeasures of low-grade reserves development from some aspects are suggested: implement encouraging finance and tax policy; reserves value evaluation method; the operation mode, has got hereinafter main achievement in several aspects.(1) Combined with the domestic and Shengli oilfield actual situation at present, the thesis define the scope of low-grade reserves, including three parts of the reserve resources: First, under the present technical and economic condition, the economic feasibility evaluation for not feasible reporting proving untapped reserves; Second, loss of development under the present technical and economic condition already the proven developed reserves, including two kinds of situations that at the loss condition already the developed reserves in the present and the non-economy exploitation value remaining reserves; Third, unable to report as a result of the economic efficiency is low or not the resources of proven reserves. On this basis, the paper has further carried on the economical classification regarding to the low-grade reserves, divides into the marginal low-grade and the uneconomical low-grade reserves, has formed the relatively systematic low-grade reserves resources classification system.(2) In view of the disadvantages of original reserves evaluation method that development index forecast that difficult and efficiency low status insufficient, the thesis has established the untapped low-grade reserves evaluation method- economic limit forms tong, might through the contrast of the sub-area initial designated date oil productive and the economic limit forms to evaluate whether to belong to the low-grade reserves.(3) In view of the cost of Shengli oilfield can only gather together to the oil field stratification plane and unable to give the unit ton oil costs condition, the thesis establishes the cost split method and the cost forecast model to determine the unit costs. Marginal cost method has proposed as the evaluation method of the developed low-grade reserves, the thesis has solved the problem of how to evaluate the developed low-grade reserves under the present technical and economic condition.(4) Using the economic limit forms tong method and the marginal cost method, the thesis has evaluated respectively the potential scale of Shengli oilfield current untapped low-grade and developed low-grade reserves under the different oil price, has summarizes respectively the geological development characteristics at present of untapped low-grade and developed low-grade reserves.(5)The countermeasures to the subsequent development of low-grade reserves from some aspects are suggested: stimulate tax policy; improve and perfect further the evaluation method of resource value; reinforce tackling key problems in the supporting technology of development integration; simplify the above ground coping facilities; fumble the development pattern etc.