Research On Stratigraphic Characteristics Of Deep Formation In Changling Fault Depression

Through comprehensive analysis of lithology, electrical, seismic, outcrop and other analytical information, the use of sequence stratigraphy, lithology, stratigraphy, logging geology, sedimentology, seismic stratigraphy of the latest theories and frontier methods, sequence stratigraphic framework of Changling fault depression for the detailed in-depth study.Through the study of sequence stratigraphy, the formation of Changling fault depression is divided into a first-class sequence, three second-class sequences, five third-class sequences. Changling summed up the deep rift strata Huoshiling group,Shahezi group, Yingcheng group lithology, electrical, seismic, and pollen assemblages.Huoshiling group can be divided into three lithological types of lithologic, the combination of a large section of andesite, carbon mudstone and conglomerate combinations, combination of clastic rocks and tuff; electrical characteristics of high resistance, low gamma, low interval transit time for the characteristics of reflecting point clear boundaries, low-frequency seismic section, middle high amplitude, buninoid or disorder reflection; Shahezi group major lithology is thin sand mud interbed, with low electrical resistance, high gamma, characterized by high interval transit time, the seismic section with a more continuous weak reflection or blank reflection is features; Yingcheng group is divided into three sections , the first stage of them dominated by acidic volcanic and seismic profiles corresponds to a disorder weak reflection; the second stage of them, the seismic section showed the strong amplitude, better continuity, parallel, sub-parallel to the reflection characteristics; the third stage of them composed by the mafic-intermediate volcanic rocks, the seismic section showed strong amplitude high continuous parallel reflection characteristics;Drilling and seismic data studies have shown that the main phase of Huoshiling group is volcanic phase, locally developed clastic phase; Shahezi is fan delta facies combination of the folder part of the coal seam; Yingcheng for the fan delta , clastic volcanic lake phase and phase composition, the second stage of Yingcheng is fan-delta facies, clastic lacustrine facies combination of the third stage of Yingcheng is fan-delta facies, clastic volcanic lake phase and phase combination.Meanwhile, the rift with the construction of Changling geological features, describing the rift sedimentary model Changling fault depression sedimentary map and profile, it will play an great significance. role on the Changling fault depression of oil and gas development.