Research On Characteristics Of The Deep Strata In Dehui Fault Depression

In this paper, the guidance of sequence stratigraphy,Method of using an integrated stratigraphy,Conducted a systematic Research for deep strata in Dehui fault Depression.Through the research of sequence stratigraphy, the deep strata divided into one first-order sequences,three second-order sequences,six third-order sequences。Summarized Dehui rift deep strata Huoshiling group,Shahezi group,Yingcheng group lithology,electrical,earthquake and pollen assemblage features.Huoshiling group main lithology is purple,green,gray basalt and volcanic breccia,on the seismic profile is low frequency the strong amplitude , hummocky or chaotic reflection as characterized , Pollen assemblage is Cyathidites-Piceaepollenites–Pollenpini, Shahezi group Main lithology is interbedded sandstone and mudstone, Electrical is low resistance, high-gamma and high acoustic time, on the Seismic profile is Weak reflection and blank. reflection, Pollen assemblage is Cicatricosisporites-Piceaepollenites–Pollenpini, Yingcheng group is divided into three sections, First section is main acidic volcanic rocks, On the seismic profile is messy weak reflection, Second Section is main clastic rocks, On the Seismic profile is the strong amplitude, better continuity, parallel or sub-parallel reflection characteristics, The third section is Basic volcanic rocks, on the Seismic profile is high amplitude, high- parallel reflectance characteristics of a high continuous, Pollen assemblage is Cicatricosisporites-Paleoconiferus-Pinuspollenites.The results of Faulted structure show that Northern is graben structure of double-break type, Central is compound faulted structure.The results of drilling and seismic data show that Huoshiling group is mainly volcanic facies, Shahezi group is fan delta facies,Clastic lacustrine facies and Coal Seam, First section in yingcheng group is fan delta facies,Clastic lacustrine facies and volcanic facies,second Section in Yingcheng is fan delta facies and clastic lacustrine facies third Section in Yingcheng is fan delta facies,Clastic lacustrine facies and volcanic facies.This research solve the problem of drilling stratified and seismic stratification unification, Established Stratigraphic framework of deep strata, Determine the distribution of formation.