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Discovery of “Enveloping Surface of Oil and Gas Overpressure migration” in the Songliao Basin and its bearings on hydrocarbon migration and accumulation mechanisms

引用

Science China Earth Sciences 2012年第12期55卷 2005-2017页

作者： FENG ZhiQiang ZHANG Shun FENG ZiHui Daqing Oil Field Corporation Ltd.of China Petroleum Daqing 163712China

The Fuyang oil layer of the Songliao Basin is a tight and low-permeability sandstone pay zone formed in the fluvial-shallow water delta *** the formation are mainly lithologic reservoir and tight *** lacustrine-mudstone of K2qn1 is a good source rock and also acts as a good regional cap *** Fuyang oil layer is a typical upper-source and lower-reservoir pattern distributed in a large *** on a large number of exploration and development data, a macroscopic enveloping surface is found developed in the Fuyang oil layer, which is below *** effective reservoirs within the enveloping surface are commonly saturated with oil, and below the enveloping surface are mainly water *** distance from the enveloping surface to the bottom of the source rock is usually 100-350 m and at most 550 *** the research of the distribution patterns and the physical properties of the sandbodies above or beneath the source rock, it is concluded that: 1) the enveloping surface is the boundary of the overpressure hydrocarbon migration; 2) the spacial distribution of the pressure release beds controls the direction and the distance of the overpressure hydrocarbon migration; 3) tight oil reservoirs and lenticular oil reservoirs are mainly formed inside the envelope surface, whereas, conventional reservoirs are formed outside the envelope surface as a result of the buoyancy hydrocarbon *** discovery of the "overpressure hydrocarbon migration enveloping surface" and the concepts of overpressure hydrocarbon migration and buoyancy hydrocarbon migration not only challenge the old notion that "hydrocarbon migrates along the faults and is distributed along fault belts" in the Fuyang oil layer of the Songliao Basin, give a new explanation to the long-distance-oil-downwards migration (hundreds of meters) and expand the exploration potential of the Fuyang oil layer, and provide a rational guidance to the exploration of syncline plays, but also bette

关键词： enveloping surface overpressure migration buoyancy migration pressure release bed tight oil and gas Songliao Basin

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