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Filling type sedimentary system and biogas accumulation in incised valley of the Yangtze River estuary since sub-interglacial stage
Pages: 130-136
Year: Issue:  2
Journal: Resources Survey & Environment

Keyword:  progressive cycleregressive cyclebiogenic gassequence stratigraphymaximum flood-ing surface;
Abstract: Based on analyzing the sedimentary characteristics of the drill hole NTZK01 in Beixin Coun-ty,Qidong city in Jiangsu Province,combined with the forty-five samples of organic carbon and fourteen values of permeability in this drill hole,it discusses the sequence stratigraphic characteristics and explora-tion prospect of shallow biogenic gas in sub-interglaciation(LG)and postglacial (PG)period.The research shows that the stratum were corroded and some riverbeds were persisted because of rapid falling of the sea level during transgresive cycle in the subinterglaciation(LG)period.A set of complete transgresive-regres-sive cycle was developed during transgressive cycle in the postglacial(PG)period,and the fluvial facies, neritic facies and delta facies were developed successively in incised valley area from bottom to top.The bottom surface of postglacial transgresive cycle was the bottom erosion surface,and the maximum flooding surface was mainly developed in the silt clay layer,below the maximum flooding surface was progressive cycle and above was regressive cycle.
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