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ZONED-DISTRIBUTION OF OIL AND GAS ACCUMULATION IN FAULT DEPRESSIONS IN THE SONGLIAO BASIN

Zhou Liqing1,2,Wu Yuyuan1,2,Zhang Huai1,2(1.East China Branch Company,SINOPEC,Nanjing,Jiangsu 210011,China;2.Geology Department,North West University,Xi'an,Shaanxi 710069,China)  
Controlled by the NNE oriented deep fault rupture,three Late Jurassic-Early Cretaceous fault subsidence zones were developed in the east,middle and west of the Songliao Basin.Evident differences among structure depositional evolutions of these three zones cause distinct zoned-distribution of oil and gas accumulation in this area.In heritage deep sags developed along the Sunwu-Shuangliao deep fault in the central part,large thick lacustrine facies source rocks and volcanic rocks as well as sandstones and grits were developed.The fault sags are overlaid with multiple giant thick lacustrine facies mudstones,providing favorable conditions for oil and gas containing,as well as for continuing thermal evolution.Therefore,a number of middle and large scaled oil and gas fields were developed on the nearly EW strike heritage nose-like dome belt in low uplifts and slope break zones.While in the east and west margin,only small and middle scaled oil and gas fields were developed,due to the small volume of hydrocarbon rocks with lower quality mother matter,low source rock abundance and poor containing condition.
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