Research On Stratigraphic Characteristics Of Shahezi Formation In The Mid-west Fault Depression, Songliao Southern Basin

In this paper， the guidance of sequence stratigraphy，Method of using an integratedstratigraphy， From the perspective of the basin evolution，Evolution to the formation ofsedimentary unconformity is used as the standard，The traditional hierarchical characteristicsof the Interface group marked，Synthetic seismograms as a bridge Formation group andsegment to each well coordinated with coordinated. Detailed comparison between wells themethod of Comparison with well and seismic, established isochronous sequence stratigraphicframework，determine the Stratigraphic division programs.Through comprehensive analysis of lithology, electrical, seismic reflections andpaleontological characteristics, summarized the stratigraphic characteristics of Shaheziformation in the mid-west fault depression.The stratigraphic characteristics of Shahezi formation in Shuangliao fault: lithologicalcharacteristics contain ash black, dark grey mudstone and sandstone, glutenite, locally withcoal; well log is consistented with lithology, resistivity curve of glutenite is high and zigzag; aset of lower littery or moundy discontinuous reflection turn into upper gap reflection orcontinuous parallel reflection in the seismic section; cicatricosisporites，paleoconiferus andpiceites make up the sporopollen.The stratigraphic characteristics of Shahezi formation in Yingtai fault: lithologicalcharacteristics is tufaceous, andesitic glutenite and ash black mudstone interbed, with highresistance, low gamma on the bottom and low resistance, high gamma on the head; theseismic section characteristics is a group of middle-weak amplitude, low and mediumfrequency, medium continuous reflection; osmundacidites and protoconiferus make up thesporopollen.The stratigraphic characteristics of Shahezi formation in Changling fault: lithologicalcharacteristics mainly contain dark mudstone, with grey siltstone, sandstone and coal seam;electrical characteristics of low resistance, high gamma, high interval transit time, the seismicsection with a more continuous weak reflection or blank reflection is features;piceaepollenites, pseudopicea and protopinus make up the sporopollen.