The Evaluation On Development Characteristics And Remaining Oil Of Ed1-ed2 In Shengtuo 28 Fault Block

Shengtuo oilfield has entered high-watercut development in the late stage. The contradiction between reservior and production is very outstanding. The development present situation is including low oil recovery speed, low recovery degree and high-watercut. Therefore it is necessary to make a comprehensive research about the oilfield reservoir. Shengtuo 28 fault block is a dome anticline, which is located in Dongying sag. It is cutted by faults to become complicatly and it belongs to high porosity and high permeability reservoir. Interlayer and intraformational heterogeneity is not strong, but plane heterogeneity is strong. The underground crude oil viscosity is high, which belong to heavy oil reservoir with normal temperature and pressure of the system. Development contradictions are mainly including high viscosity of crude oil, fast watercut rising, no obvious of water injection development effect, the low rate of injection-production corresponding and the uneven displacement.In this paper, according to the geological characteristics and the development status of Shengtuo 28 fault block, analyse the work area formation characteristics, the sedimentary facies,fracture system,reservoir heterogeneity, reservoir development characteristics and fluid properties. Based on the reserves parameters and small layer sand body, I calculated the geological reserves.Based on the present reservoir development situation, the energy situation and water injection conditions to analysis the characteristics of development. Use the water drive characteristic curve, production decline method, the accumulative curve method to predict recoverable reserves, recovery factor and the dynamic analysis of development.Through analyzed the cumulative curve method, the paper puts forward the definition of ideal recoverable reserves. In the present state of development and production, the production is decline to zero which reflects the maximum recoverable reserves. When oil production is decline to the economic limit production, oilfields will be scrapped. This part of the cumulative production is the economic limit recoverable reserves. When oil production is decline to zero, this part of the cumulative production is the non-economic recoverable reserves. Therefore, the ideal recoverable reserves are consist of the economic limit recoverable reserves and non-economic recoverable reserves, which responses the oil well production capacity and can be used for evaluating the oil well productivity. Ideal recoverable reserves related to geological and engineering factors. The ideal recoverable reserves are affected by reserves, physical properties and well pattern perfection. Through research, the ideal recoverable reserves are biger than the economic limit recoverable reserves, and both have a clear linear proportional relationship.Through the calculation for all single well’s remaining oil in Shengtuo 28 fault block to get the remaining oil distribution in the whole plane and get the remaining oil potential target area. To classify all well’s residual recoverable reserves and moisture content by using cluster analysis. To split each small layer accumulative production and prediction each single of each layer’s remaining oil get remaining oil enrichment horizon.The typical small layers classify the genetic types of remaining oil. It include well pattern out of control, interwell retention area, imperfect injection-production, interlayer interference. According to draw the genetic types of remaining oil distribution get target area for all kinds of remaining oil, and researched the exploration to provide well measures and the production reference.