Research On The Characteristics Of Secondary Porosity And The Rule Of Waterflood Development In The Fuyu Oil Laver Of The North Qijia Oilfield

The Qijia North oil field in Daqing western is the first large-scale injection oil layer which was low permeability and secondary porosity reservoir. We mainly exploit Fuyu oil layer, using the350x170m rectangular overall fracturing well network. Especially reservoir development of secondary porosity is different from other exploited Fuyu oil layers that lie outer in the west of Daqing at the aspect of the oil layer reservoir geological characteristics, and so it is difficult to draw a mature development experience. In order to explore the effective development of secondary porosity Fuyu oil, we carried out the research on cause and distribution of secondary porosity and better understood the development character of Fuyu oil layer’s secondary porosity reservoir and better study the influence of on waterflooding regular. In order to guide injection water policy formulation, we will provide the basis information to reserves of the overall of low permeability outlying areas of the western region of Daqing Fuyu reservoir.Through exploratory wells core thin sections, the analysis and construction of geochemical indicators, reservoir analysis, reveals the organic acid dissolution is the main digenetic process for the area of secondary porosity, dissolution in the region of difference comprehensive evaluation of the structure, faults, sedimentary microfacies, carbonate content and other factors, identify the development of secondary porosity range. Through the secondary porosity reservoir of microscopic pore structure and permeability of understanding the development of secondary porosity reservoir has a large pore, coarse crooked "micro-pore structure, and strong pressure-sensitive, high mobile oil. high drive the efficiency of oil seepage characteristics provides a basis for the preparation of secondary porosity block waterflood development program. Find out secondary porosity development degree of difference on the basis of the degree of development for the oilfield different block secondary porosity differences, combined with the microscopic pore structure of reservoir development of secondary porosity and seepage to develop"synchronization, partition, sub-deposition type separate injection of mining the relationship between water injection development policy. Oil field put into the development, by strengthening the understanding of the characteristics of water injection development, to take timely injection tracking adjustment, oil natural decline and moisture content the rate of increase in similar fields, provide a reference for similar development of secondary porosity reservoir waterflood development.