--> Abstract: The Upper Cretaceous Source Rocks and Petroleum Transportation of the West Slope Region in the Western Songliao Basin, Daqing Oilfield, Northeast China, by Dejiang Kang, Xiongqi Pang, Yanfang Lv, and Guang Fu; #90078 (2008)

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The Upper Cretaceous Source Rocks and Petroleum Transportation of the West Slope Region in the Western Songliao Basin, Daqing Oilfield, Northeast China

Dejiang Kang1, Xiongqi Pang1, Yanfang Lv2, and Guang Fu2
1Basin and Reservoir Research Center, Beijing, China
2DaQing Petroleum Institute, Daqing, China

The Songliao basin is a typical continental petroliferous basin located in northeast China. Its western sector, the west slope region, is an important hydrocarbon province, where one of the most important oil discoveries in China was made. Although Cretaceous source rocks are understood to be important parts of petroleum systems in the western Songliao basin, the identification of Mesozoic source rocks which the oil and gas belong to in the subsurface is poorly understood. Associated shales of Middle Cretaceous have long been considered to be the primary Mesozoic source rocks for the western Songliao basin without any support from subsurface geochemical and geological data, even without the specific source rock layer. The well was drilled on the Taikang uplifted structural, the west overlap belt and Fuyu structural belt in 2002 and documented specific effective source rocks. Geochemical analyses indicate that Qingshankou formation, which is the Lower Cretaceous mudstones, is good to excellent source rocks for the commercial oil wells in the west slope region whereas the Nenjiang formation (the upper Cretaceous)has little function. This discovery revised the former wrong ideas. Combined with seismic data and the evolution of tectonic movements, it is deemed that the hydrocarbon were transported from Qijia—Gulong depression where is located on its eastern area after be generated. In this course, the faults played the important role in change the transportation direction. The whole petroleum system of west slope region in western Songliao basin, with a geographical extent of 17,000 km2 and a cumulative amount of source rocks reach 300 m, represents a favorable target for future exploration, that is Nenjiang formation in the study area.

 

AAPG Search and Discovery Article #90078©2008 AAPG Annual Convention, San Antonio, Texas