The Research Of Fine Structure Interpretation And Sedimentary Facies Of Jiufotang Formation In Jiaolige Area In Ludong Sag,Kailu Basin

Ludong sag is located in Lujiapu Depression.It's a subordinate geotectonic element of Lujiapu Depression.The depression located in the Inner Mongolia autonomous region which is formed in the Mesozoic period.The basement of it is a fold formed by the Hercynian period.There are two sub-sags which are called Liaolige sub-dag and Kuluntala sub-dag,in the Lusong sag.The main target stratum is Jiufotang formation.With the development of the secondary 3d seismic acquisition,the research of fine structure interpretation and sedimentary facies is becoming more and more important.This paper makes full use of the secondary 3 d seismic data in the study area,combined with structural geology,sequence stratigraphy and other advanced theory.On the basis of all these methods,many work has been finished from basic work such as the seismic synthetic record production and level calibration and then completed the construction of the sequence stratigraphic framework in the study area.The fine structure interpretation in the study area is finished through application of seismic section interpretation technology,horizontal slice interpretation technique and coherence identification technology.The exploration targets were confirmed by studying the boundary faults,the internal development of the faults exist in the study area and the development of the favorable trap.By structure characteristic studying we found that: Jiaolige area has typical east off west upper characteristic.It's controlled by the major east-west boundary faults and a series of northeast faults.Five secondary tectonic belt developed in the study area.It's lower from north to south the same as from east to west high in terms of tectonic characteristics.On the basis of fine structure interpretation,we took the "point-line-face" study method of the research of sedimentary facies in the study area.First of all,we finished the analysis of single well facies of key wells in the study area.And then we selected the skeleton section for a group of wells facies analysis.In combination with seismic attributes and seismic facies,the target stratum sedimentary facies maps were finished.Through the analysis of comprehensive consideration of the target stratums in the study area,eventually selected 6 favorable exploration targets.