Research On The Characteristic Of The Deep Strata In Lishu Rift

This article is in the background of the researching of the entire song-liao basin south area's deep strata.By the direction of sequence stratigraphy, this article comprehensive use structural geology, sedimentology and seismic stratigraphy etc, use the basic information of mud logging, well logging, seismic, paleontology, Isotope and so on, to analysis and research on the Lishu rift.On the basic of a large regional seismic profiles, this article use the sequence stratigraphy theory and established the stratigraphy classification in Lishu rift, the deep strata is divided into three second-order sequences and four third-order sequences, determine the study area division within the deep strata.This article established the logo and standard of rock, electrical and seismic in the deep strata. The basement rocks is mainly composed of metamorphic, magmatic rock and a small amount of sedimentary rock, seismic reflection show the middle-strong and middle-weak amplitude and weak continuous or messy reflection; In the Huoshiling group, lithology is composed by volcanic rock, clip dark mudstone, the electrical characteristics is characterized by the massive, thick layer, box-like high resistance, low resistance ultra high clip, high resistance, low gamma and a low voice wave slowness, the inflection point clear in the boundaries, seismic reflection show generally strong to the weak amplitude, low frequency, weak continuous-discontinuous reflective portfolio; In the Shahezi group, lithology is mainly composed by clastic rock, containing coal, electric characteristics show the SP significantly increased compared with the SP of Huoshiling group, the resistivity curve change to a high value suddenly, seismic reflection generally show a portfolio of weak reflection for the more continuous or blank reflective, osmundacidites, pinuspollenites and picetes make up the pollen; In the Yingcheng group, the construction of lithology is mainly the sedimentary rock, in some areas being a small amount of acid volcanic rock, electric characteristics show resistance curves is middle-low resistance performance of comb, comb the bottom, dentate in the middle-high impedance, seismic reflection in the overall performance of middle-strong-middle-weak amplitude, middle-low frequency, weak continuous to discontinuous reflector combination, schizaeoisporites and classopollis make up the pollen.The results show that the deep strata in Lishu rift in the overall is performance of volcanic rocks at the bottom and clastic rock in upper part.in parts of Yicheng group volcanic rocks is development, for the two sets of volcanic folders a set of dark fine-grained clastic, locally with coal. By the conformity of Fault, deep formation lateral thickness variation, layer growth is not complete. Through the above studies and further analysis of the sedimentary facies of the deep rift we obtained the filling patterns.