Research On Mudstone-Fractured Reservoir Characteristics And Productivity Change Rules Of Qingshankou Formation In Gulong Area,Daqing Oilfield

With the development of the world oil industry, mudstone-fractured reservoir as unconventional reservoirs, more and more attention by researchers. With 18 million to 44 million tons prognostic petroleum resource in Gulong mudstone-fractured reservoir favorable exploration area, but although the region has more than 30 years of exploration history, has not been a breakthrough.The main reason is mudstone-fractured reservoir are unconventional, and conventional sandstone oil reservoir mechanism is not the same.Based on the sedimentary and reservoir geology theory as a guide, combined with structural geology and test data, etc., on the basis of contrast analysis of shale fracture reservoirs at home and abroad, Qingshankou Formation in Qijia Gulong area,Daqing oilfield mudstone reservoir petrology, cracks and accumulation characteristics is analyzed, and classified research.According to fractures permeability changing with effective stress in mudstone-fractured reservoir, combined with formation caving pressure and other parameters to determine the reasonable safety density window for different depth formations, that is fracture closure pressure research. Through laboratory experiments, theoretical calculations, the actual well verified, according to mudstone-fractured reservoir characteristics, conducted the research on natural and after fracturing productivity changing rules.The sedimentary environment of mudstone fracture reservoir is buried deep within the hydrocarbon source rock oil source window, reservoir section, generally tens of meters thick, and low content of clay mineral, rock hard, easy to form cracks, and has good reservoir, enrichment of parts for constructing high parts, turning parts, or fault zone, the high production by calcium, sand content and the development of crack control.Regard as hydrocarbon-generating overpressure of accumulation fracture had important effect on the formation and accumulation;the main factors influencing the mudstone-fractured reservoir capacity are:joint spacing and flow conductivity of natural fractures and artificial fracture length, the microstructure and physical and mechanical properties of the rock.Paper finally puts forward the Gulong area regional mudstone-fractured reservoir productivity changing rule of the oil well production with the decrease of the natural fracture spacing and flow conductivity increases; For fractured well, as the growth of the artificial fracture, yield increase, and its diversion ability have little impact. Recognizing Gulong area mudstone-fractured reservoir capacity variation.