The Reservior Geological Characteristic And Evaluation Of Development Effect In Che40 & Che44 Block Dongfenggang Oilfield

Che40&Che44 block,DongFenggang is in middle period of development of the oil field, the principal problems in the process of development are that the value of reservoir pressure is on the low side,the feed flow of production wells is insufficient and the decline of production is fast.In order to ensure efficient and steady development, the paper investigates and studies the geologic reservoir characteristics of this area so as to understand the geologic factors which affect the production, and on this basis, the dynamic analysis and the evaluation of development are made in order to find the inappropriate working system existing in production process at present, and proposes advisable technologic countermeasures to the development problems present and develops flood pattern modification in this paper at last.Firstly,through the investigation of reservoir geology characteristics of the region of interest, stratigraphic characteristics, sedimentary characteristics and reservoir heterogeneity characteristics are studied. The sedimentary facie of the upper sub-section of the third member of Shahejie is turbidity fan, and the distribution of oil layers in the third member of Shahejie is controlled dominantly by lithology. The reservoirs belong to structure-lithology reservoirs.Sand bodies in every layer distribute scatteredly, and have large various thickness with small area in sub layers, liking lens or small fans or banded. The strong heterogeneity and the poor connectivity of reservoir make the pattern flooding difficult.Then , the studys on the production characteristics and the effect of development point out clearly that many defects exist in the process of development, such as the unreasonable injection to producing well ratio , the low reservoir pressure and high the natural decline rate.Countermeasures were proposed for the existing problems properly, which contain the division of layer series of development, the choice of development mode, the confirmation of reasonable well spacing, the determination of daily oil production and the daily injection flow rate. At last, adjustment scheme were made on the basis of the former studying, and predicted the development index...