Study On The Generation And Accumulation Of Oil In Beier Depression, Hailaer Basin

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, Authigenic Illite K-Ar Dating, identification or identifying, 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 and the epoch of entrapment and pool formation; 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 Beier Sags for the first time; 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.2. Indicating that the Nantun and Tongluomiao Groups in Beier Sags 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.3. Based on the research for source rocks kitchen and origin of oils .the oil migration has been studied by the composition of pyrrolic nitrogen and other indexes. The direction and the pathways of migration was determined, and pointing out that rupture and unconformable face is the main channel of migration.The"ladder"model of migration is established.4. 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. 5. 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.