Residual Oil Distribution And Adjustment Well Deployment Research In North Block Of Gaoshangpu Oilfield

The major reservoir of Block G104-5 in Gaoshangpu Oilfield is a conventional heavy oil reservoir controlled by border fault having medium-high permeability and edge and bottom water structure with severe reserve plane, interlayer and in layer heterogeneities. After the nearly ten years of development and adjustment, main producing horizon has entered the high water cut stage. However, due to reservoir heterogeneity of braid river, there remains relatively considerable non-producing reserves and remaining recoverable reserves in interwell areas, high part of local minitype forward direction structure without well control and poorly produced sectors of some small layers. This thesis focuses on getting a clear understanding of in layers and in plane residual oil distribution and reservoir potential and identifying oilness and oil reservoir size in the upper part of major reservoir on the basis of sufficient investigation and analysis.In this thesis,firstly, based on fine geologic research, the micro-structure of the top in pay zones Ng12-13 is identified, and meanwhile the development of intercalations and reservoir and distribution feature of reservoir physical properties are investigated, all of which provide geologic evidence for compiling development adjustment scheme. Secondly, 3D geological model is accurately established through full use of seismic data, drilling data and logging data; on the basis of the previously established modeling, the models of lithology, porosity, permeability and oil saturation are established. Thirdly, numerical simulation researches are conducted to pay zones Ng12,131,132,133 through the full application of all available dynamic and static data. Through production historical matching, water invasion rules and residual oil distribution are thoroughly investigated, providing physical material foundation for well location deployment of horizontal wells and compilation of development adjustment scheme. Finally, the development adjustment scheme is outlined as follows: 1) local adjustment of horizontal wells in Pay Zone 12 and overall development adjustment for horizontal wells in Pay Zone 132, 2) carrying out comparative analysis for development adjustment effects of different horizontal well development schemes, 3)carrying out well location deployment for horizontal wells, including optimization of horizontal wells and relevant policies for development techniques, 4) drawing up the implementation suggestions for horizontal well.