黑龙江鸡西盆地北部穆棱组高分辨率层序地层

High-Resolution Sequence Stratigraphy of Muling Formation in Jixi Basin of Northern Heilongjiang Province

采用钻孔资料对鸡西盆地北部含煤岩系中穆棱组进行了高分辨率层序地层划分,共识别出3个长期、7个中期、58个短期基准面旋回。中、长期基准面旋回由上升、下降2个半旋回构成对称型结构,短期基准面旋回分为对称型和非对称型结构。通过各种级别基准面旋回特征分析,讨论了穆棱组的沉积动力学特征和沉积延续时间。认为穆棱组在鸡西盆地北部条带经历了3次盆地范围内较大规模的湖侵—湖退沉积和7次中等规模、58次小的湖侵—湖退沉积作用,延续时间为5.8 Ma。

Using the data of drill hole in the northern coal-formation of the Jixi basin in the eastern Heilongjiang Province, the high-resolution sequence stratigraphy subdivision of Muling Formation is made, and cycles of datum plane of three long-terms, seven medium-terms and fifty-eight short-terms are identified. The medium-term and the long-term cycles of datum plane are made of symmetry structures by the two half-cycles of rising and falling, and the short-term cycle of datum plane are divided into two basic types of symmetry and non-symmetry. The characteristics of sediment dynamics and the continued sediment time are discussed through analysis of various cycles of datum plane. By detail study, it is considered that the Muling Formation had undergone three large-scale sedimentations from transgression to regression with the basin, seven medium-scale and fifty-eight small-scale sedimentations from transgression to regression in the northern coal formation of the Jixi basin, and the continued time of sedimentation of Muling Formation is 5.8 Ma.