Research On Sequence Stratigraphy In Dehui Depression Middle-shallow Layer Of Southeast Uplift

Based on the recent theory and method of Sequence Stratigraphy, Sedimentology and Seismic Stratigraphy, this paper uses seismic, logging and core information to analyze and research the sequence formation framework and sedimentary facies of Dehui Depression Middle-shallow Layer in Southeast uplift. Moreover, combined with structural geology feature of Dehui depression, the combination law of oil source bed, reservoir, caprock of Dehui formation is studied and the distribution area of favourable sand body is predicted. The result offeres the dependable evidence for sequence division, and it is significant for the exploration and development of oil and gas.According to seismic, comprehensive logging, logging and core information, this paper classifies Dehui Depression Middle-shallow Layer into four two-order sequences and twelve three-order sequences according to the principle of correlation between wells. This paper describes the features of each sequence and system tract. On the basis of sequence division, sedimentary environment and sedimentary facies, obtained in middle-shallow layer the original oil and gas sources of oil and gas, mainly from Qingshankou group and Denglouku group, but the number of less difficult to form large-scale oil and gas reservoirs, in middle-shallow layer should still mainly look for the secondary oil and gas reservoirs, its oil and gas mainly comes Yingcheng group and Shahezi group.This paper predicts the favorable perspective play by comprehensively considering basic conditions for the formation of reservoir (source bed, reservoir, caprock and trap, etc) and distribution of sand bodies.