2004•Acta Petrologica SinicaRequires access
Architectural model of sequence stratigraphy controlling the distribution of litho-trap in deep-water lake of Songliao depressive basin
Cai Xi-yuan
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Abstract
The sequence stratigraphy,sedimentology and petroleum geology were used to study the architectural model of sequence stratigraphy controlling the distribution of litho-trap in deep-water lake of Songliao depressive basin.It is found that during the depositional period from Qingshankou Formation to Nenjiang Formation,Songliao Basin was a deep-water depressive lake.The slope of the basin was gentle along the long-axis and was steep along the short-axis.Along the long-axis,the distributary channel of delta was developed very well,but the mouth-bar,distal-bar and lake-floor-fan sediments were thin.Along the short-axis,the mouth-bar,distal-bar and lake-floor-fan sediments were developed in the order toward lake-direction and lacking in the sediments of distributary channel of delta.The litho-trap was mainly developed in the depositional area of mouth-bar,distal-bar and lake-floor-fan on the gentle slope,or in the depositional area of lake-floor-fan on the steep slope.