Study On Relation Of Huanghekou Sag And Changdi-kendong Buried-hill Draping Structural Belt

Base on drilling and logging data, seismic data and previous research results,follow the influence of structural evolution to research area, consider that stratigraphiccorrelation analysis, this essay carries out tectonic characteristics investigation,analyzes inner connection of Changdi-Gudong-Kendong structural units and theirrelation to regional tectonic evolution, finds out relation between three structural unitsand Huanghekou sag, discovers their impact on structural-sedimentary evolution ofHuanghekou sag.Guided by sequence stratigraphy, this essay carries out stratigraphic correlationanalysis in each structural units, and turns out the Kongdian formation and the fourthsection of Shahejie formation is more developed in north of research area, while thesedimentary characteristics of the third to the first section of Shahejie formation issimilar in the whole area.After subsidence history, evolution section, tectonic style analysis, this essaypoints out tectonic evolution of different structural unit-Changdi, Gudong, Kendongarea-is similar during Shahejie formation, with obvious distinction during Dongyingformation, subsidence center migrates from south to north, from west to east, which ismainly generated by the movement of Tancheng-lujiang fault zone and migration ofregional subsidence center.Study on faults activities indicate that Changdi, Gudong, Kendong faults haveintense activity during Shahejie formation and weak activity during Dongyingformation, while faults have diversity. Subsidence center of Changdi fault movesnorthwards during Palaeogene, but subsidence center of Gudong and Kendong faultsremain steady, activity of faults reduce from center to both sides. Changdi, Gudong,Kendong structural units are all belongs to Huanghekou sag, develop on gentle slopeof Huanghekou sag, complicated by several faults. This essay also finds out faultsdevelopment control sedimentary of southwest slope of Huanghekou sag strongly.Changdi, Gudong, Kendong area are provenances of Huanghekou sag, which supply provenances to west step-fault zone and southwest sub-depression ofHuanghekou sag. The third section of Shahejie formation is different fromfirst-second section. Faults have strong activity during the third section, research areaprovides more provenance to Huanghekou sag, distribution range of sand is wider;during the first-second section, activity of faults are weaker, supply is insufficient,distribution range of sand shrinks.