| As for the actual problems ,such as research on the generation, migration and pool forming of oil& gas in the production and research, this project is mainly based on general requirement brought forward by the Daqing oilfield Company Limited, whose purpose is within three years to accelerate the oil& gas exploration in Hailaer Basin. Adopting multinomial new technology and methods, likely the fluid inclusion Micro-FT.IR, special biomarker identification, Whole Rock Maceral Composition Analysis, the composition of pyrrolic nitrogen analysis, combining with geological research, and combining with new theory and new data, the project made the research on the characteristics and mode of oil generation, the distribution of hydrocarbon kitchen was determined. According to the characteristics of geochemistry, the division of oil population was completed, and then the oil sources were determined. So were the direction and channels of oil migration;the project also analyzed the processes and main control of pool forming, presented the model of pool forming and predicted the favorite region. The whole project having been completed, many innovations have been achieved in oil generation and migration.1. Indicating the muti-composite oil&gas generation mode in Wuerxun Sag for the first time;pointing out that the research region was characterized by multilayer source rock including Nantun group and Tongbuomiao group, many kinds of original source material including algae low hydrobiology, altitude hydrophytes and bacteria etc al, and many oil formation phases during the low and high maturation evolvement periods.2. There is obvious heterogeneity in the distribution of organic abundance of source rock. There is thin quality part in the source rock, which has the high organic abundance and ample algae. It contributes to the generation of oil in the region greatly.3. Indicating that the Nantun and Tongluomiao Groups in Wuerxun Sag have been formed in 3 kinds of sedimentary environment. One is the lake facies deposition of the fresh-slight-saline water with weak reduction, one is the fresh-slight-saline with weak oxidation, and another is the salty water with strong reduction.4.Presenting the model of hydrocarbon formation-expulsion of source rock, and pointing out that threshold of oil generation in Wuerxun Sag's is 1550m, the generation peak is 2200m, the expulsion threshold is 1700m. Determining the distribution of the effective hydrocarbon source rock and the main hydrocarbon kitchen.5. Based on the sedimentary environment and maturation of original organic matter, dividing the oil of Wuerxun Sag into 4 oil populations and 6 oil families and also determining that the oil mainly come from the corresponding source rock of Nantun group, Tongluomiao group and Damoguaihei group.6. By the composition of pyrrolic nitrogen and other indexes, the direction of migration, researched the channel of migration was determined, and pointing out that rupture and unconformable face is the main channel of migration.7. Using the homogenization temperature of the reservoir fluid inclusion and Micro-FT.IR, Authigenic Illite K—Ar Dating , light hydrocarbon of oil and so on synthetically to confirm that the pool forming epoch is mainly in the lower and the upper of Yimin group deposition.8. The distribution of the source rock available control the distribution of pool. The zone of the twisting structure controls the distribution of gathering zone. The uncomfortable face also controls the distribution of oil& gas in the space.9. Forecasting 1 favorite potential zones, 1 favorite structural gathering zones, 2 favorite lithologic pool zones and 2 favorite slope zones. |
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