Study On Fluid Identification Of PuTaoHua Reservoir In GuLong Oilfield

Because the influences of several factors including structure, deposition, diagenesis and so on in the Pu taohua formation of Gulong oil field, the resistivity of oil zone changes obviously in the different blocks. The resistivity of the low resistivity oil layers is close to the resistivity of water zones then lower than the resistivity of water zones. The relationship of oil and water is complex. The study of fluid identification methods is done in the Pu taohua formation of Gulong oil field for finding out the oil-water distribution rules, evaluation reservoirs finely and providing technological supports of reserves and development plan.A lot of data is used, such as well log, coring, oil test, mud log and so on, to study the relationship of four properties of reservoir. The results show that the logging responses reflect the changes of physical property and oil-bearing property in Pu taohua formation. Through the analysis of complex fluid origin, fine lithology, high shale content, strong additional conductivity, high bind water saturation and micro pores development result in low resistivity oil zones and residual oil and alcareous result in high resistivity water zones. Because Putaohua oil formation is lithologic and structure-lithologic reservoir in the complicated structure background controlled by multi-source, Gulong oil field is divided into three blocks to study through analyzing the rules of sendimentary microfacies and log response features. The statistical analysis method is used to establish interpretation model of shale content, porosity, permeability respectively. Based on analyzing the data of petrophysic experiments, the laws of pore configuration and conductivity are studied, then reservoir is classified into five types. The features of nuclear magnetism resonance of each reservoir are summarized, the rock-electric parameters are determined in each reservoir then the initial oil saturation is calculated according to Indonesia equation. The characteristics of well log and mud log responses of typical oil and water zones are summarized in the research area, based on these characteristics, the resisitivity curves are used to correct shale and calcium ultimately. The identification plots of oil water zones are established according to well log and mud log data in the different blocks. Then the lateral-induction overlap method, special log data process and interpretation, multi-well evaluation and plots are combined to interpret oil and water zones comprehensively, and the method is formed to distinguish complex fluid property in Putaohua reservoir in Gulong oilfield. Through well test of eight wells, the interpretation coincidence rate is 90.9%, getting good result. The technological methods and means are adapted to sandstone reservoir of complex fluid distribution and can be popularization in outer-ring oil field of Daqing placanticline, this method can acquire broad application value and economic benefit.