黑龙江东部汤原断陷古近系沉积相类型及其演化规律

Paleogene sedimentary facies and their evolution in the Tangyuan fault depression,eastern Heilongjiang,China.

利用汤原断陷29口井岩心、录井、测井和1028km二维地震资料,对汤原断陷古近系沉积相类形及其演化规律进行了研究,识别出3种沉积相、7种沉积亚相和17种沉积微相。明确了汤原断陷邻近陡坡带一侧湖底扇和湖泊相发育,缓坡带一侧扇三角洲发育,邻近断陷的中央次级隆起带湖底扇和扇三角洲发育。汤原断陷古近系湖盆经历了由小到大再到小的过程。

Three sedimentary facies, seven sedimentary sub-facies and seventeen sedimentary micro-facies are recognized in the Tangyuan fault depression from studies of the types and evolution of Paleogene sedimentary facies, using the core data, welllogging data of 29 wells and 1028 km long 2D seismic survey data. It is suggested that： lake-bottom fan facies and lake facies are developed along the steep slope of the Tangyuan fault depression, the fan-delta is developed on the gentle slope of the depression, and the lake-bottom fan and fan-delta exist in the central secondary uphft near the depression. The Paleogene lake basin of the Tangyuan fault depression experienced a process from small to large and again to small.