Evaluation Technology Research And Classfy On Untouched Reserves In Zhongyuan Oil Field

As zhongyuan oil field is entering its declining era, the development and output stability are becoming more and more difficult, it is very urgent to find new reserves. With no exploration break, the proved untouched reserves are the direct and real alternative. Its` development is very essential to zhongyuan oil field.This research discusses the evaluation for untouched reserves and points that the consideration of the exploration and development investment is unreasonable, which will underestimated the reserve value. The investment of exploration, including preparation fee, which has nothing to do with the current decision, should be sunk and not be entered into the current flow. The characteristics of the untouched reserves in Zhongyuan oil-field are small, deep and poor, it is not economical to develop according the current economic evaluation of SINOPEC. The current evaluation method bases on the current mechanism to calculate the operation cost without the consideration of economic profit resulted from mechanism change, this is also the reason why some reserves are evaluated no-profit. This article proposes a margin profit method to evaluate the untouched reserves to prove the effectiveness of the additional investment. Classifying the untouched reserves on economics, a new industrial base earning ratio and project base earning ratio are proposed to decide project economics. This theoretically provides the economical base for the development of the untouched reserves.Considering geology and formation engineering assessment, this article discussed the evaluating attribute system through economic evaluation for untouched reserves. A economic boundary model is built and economic evaluation is studied for the 2004 untouched reserves in Zhongyuan oil-field, this results a profit ranking , which is the base for investment optimization.