Research On Sequence Characteristics In The Shallow-middle Level Of LiShu Depression In Southeastern Uplifted Area

The latest theory and method of sequence stratigraphy, sedmentology and seismic straligraphy are adopted in this paper. By using the data of seism data, log data, core information, the framework of sequence strata and sedimentary facies in LiShu depression are analyzed and studied deeply, also the advantageous targets are researched and forecasted primarily. The fruit enrich the theories of sequence stratigraphy and sedimentology. All researching will play an important role in exploration and development of this area.According to the previous research results , tectonic development , seismic, comprehensive logging, logging and core information, this paper classifies LiShu depression into two two-order sequences and six three-order sequences according to the principle of correlation between wells. From bottom to top, two two-order sequences areâ…¡1 (Denglouku Formation) andâ…¡2 (Quantou Formation). SB3 (Equal to T3 reflective layer) is the sedimentary transformation surfaces between the two two-order sequences. Six three-order sequences are Sq1 (Deng-1 Segment), Sq2 (Deng-2 Segment), Sq3 (Quan-1 Segment), Sq4 (Quan-2 Segment), Sq5 (Quan-3 Segment), Sq6 (Quan-4 Segment).On the basis of Single-well and core facies, the sedimentary facies features, depositional model and sedimentary system distribution features of LiShu depression are definiteness through this research. The sedimentary facies of Quantou Formation is mainly fluvial facies, Denglouku Formation is mainly shore-shallow lake facies and braided delta facies, fan-delta facies are developed in the surrounding area.