Affecting Factors Of Thin And Poor Reservoir Thickness Interpreting Accuracy Research In Xingbei Economic District Of Daching Oil Field

After more than40years’ water injection development in the Xingbei EconomicDistrict of Daching Oil Field，every oil layer has been floored at different levels，at present，the Xingbei Economic District has entered the stage of ultra high water cut stage and theadjusted potential targets has gradually changed to thin reservoir (the effective thickness<0.5m)and poor reservoir (the independent outer reservoir).Its serious reservoir inhomogeneity，morereservoir layers，the great changes of lithology，physical property，the complicated porestructures，together with the high scattered of residual oil in late stage of high water cut，andthe complicated changes of the fluidness nature beneath earth surface and the pressure profilebetween the reservoirs，result in1）that the relationship between rocks and electricity of thereservoir become worse，2) that the present electrical standard is not adapt to the explanationof the layer thickness，which influences the explanation precision，especially zoned rate low ofthe more thin and worse reservoir．Besides，there are no systematic parameter and theexplanation methods of the watered layers，which has resulted in difficulties to the oilfieldwater injection，residual oil description and adjusted exploration work．Therefore，the researchon the factors influencing explanation precision of the more thin and worse layers is of animportant implication for improving thin and poor reservoir thickness interpretation accuracyinfluence factor research in the Xingbei Economic District of the Daching Oilfield．With theanalyses of the phenomenon in detail through the existed problems of the layer thicknessexplanation method，from the different well webs，a series of logging changes electricitystandard and mud density，this thesis finds out the reasons of the effects of thin and poor reservoir thickness less zoned，1) the complicated layer fluidness beneath earth surface leadsto the great changes of the Logging response；2) no physical standard of sheet thickness resultsin interpretation coincidence rate；3) the electric standard of reservoir effective is inadapt withuntabulated thickness interpretation；4) the time of each set of well pattern development ofwell drilling is associated with well logging series changes．On the basis of this study，wedeveloped a set of reservoir thickness interpretation of Electrical Standard．At the same time，because of the application of water-flooded layer interpretation method is developed in highwater cut period，its interpretation model and water out level degree of subdivision can’t meetthe needs of oil field development．Therefore，this article finds out the explanation method oftabulated reservoirs and untabulated reservoirs from the basic theory and detailedexplanation． Besides，The article also has some evaluation of the well logging series and allkinds of thickness interpretation electric standard．From doing the research，I have exploredextra high water cut period of water flooded layer thickness interpretation of electricalstandards and water-flooded layer interpretation method， applying some technologicalexamples for the other same kind of oilfield．...