Oil And Water Distribution Research In Gulong Oil Field

As an oilfield with complex oil reservoirs in Gulong oilfield, accurate prediction for the distribution of oil fields, is the core issue to ensure stable oil production and improvement of recovery. Under the dual influence of lithology and structure, distribution of water and oil in working area shows "oil-water layer, oiled water, underwater oil, oil-water layer between each other," and other features, combined with a variety of means to characterize faults, micro-amplitude structures, microfacies, oil and gas forming conditions, is the key arrangement to improve the accuracy of understanding of the reservoir's water-oil distribution, favorable block and advantageously discovery wells.The study area is mainly lithologic reservoirs, followed by structural-lithologic composite reservoir, oil layers is mainly Putaohual,which lithology in vertical and lateral change quickly, reservoir distribution in space is unstable. In continued exploration and development in Gulong oilfield, and gradually exposed sand deposition and water relations are very complex in this area, developing directly on the basis of the original proved reserves is of great risk, accurate understanding of the block small layer of sand distribution, reservoir properties change, water distribution is in urgent need.In this thesis. Putaohua Oil layer of Gulong Oil field is the key study area. Based on log data standardization and well seismic joint geologic horizon calibration, well seismic joint characterization methods were used. Through a variety of methods, which include to division and correlation by high resolution sequence stratigraphy, research faults and micro-amplitude structure characterized by various methods, describe different scale channel sand bodies along the layer by many ways, and characterize oil-water distribute and reservoir types along the layer by many ways, at last, fault space distribution and micro structure are determined in Putaohua Oil layer of Gulong Oil field. Simultaneously, it is accurate for us to ensure the distribution of sand bodies and research main control factors in accumulation how to impact oil-water distribution. Based on the above parts, fine geologic research process is formed in Putaohua Oil layer of Gulong Oil field, which can effectively guide the determine of favorable block and the deployment of favorable well.The main achievements are as follows:1. Using of logging, logging, seismic and other information, conduct high resolution sequence stratigraphy studies of Putaohua layer, identified Gulong oil Putaohua layer base-level cycle, established a high-resolution rate isochronous sequence stratigraphic framework of study area, drawn Putaohua vertically on a whole for the first gradually shallower water-water withdrawal largest-water deepening-Sapu interlayer water reached opposite conclusions maximum process. Formation gradually thinned from east to west.2.The use of three-dimensional horizontal slice to implement all micro-structures, small grid and small contour interval (usually lm) to FIG. Combined construction trend surface analysis.3D slice technology, effectively discovered micro amplitude structures which fault distance less than 5m.160 micro-amplitude structures was found.3. By SGR fault seal assessment methods, results and good fault sealing work area accounted for more than 60%. moderate between 40% and 60%, the difference is less than 40%.4. Based on high-resolution sequence stratigraphic division and correlation, combined the results of previous studies of sedimentary system, provenance direction, sedimentary characteristics, sedimentary facies. sand body type, deposition mode to study and fully combine seismic attributes results finalized the spatial distribution of sand bodies of study area.5. A detailed analysis of Gulong oil Putaohua vertical, flat water distribution characteristics is done. Divided Putaohua reservoir type, determines the distribution of types of reservoirs.6. By analyzing oil generating conditions and migration patterns of source, combined oil and gas storage conditions, traps conditions and failed well analysis to determine the different storage factors each reservoir block in the work area.7. Based on high-resolution sequence stratigraphy, structure and fracture characteristics, sedimentary characteristics, reservoir characteristics and diagenesis, accumulation rules, main control factors as well as water distribution, combined with reservoir type, test and development wells production capacity and other circumstances, predicted a favorable block and preferred design wells.