松辽盆地青山口组介壳滩的分布特征及控制因素OA

In view of the problem of weak research on distribution laws and controlling factors of shell shoals in Qin-gshankou Formation of Songliao Basin,well-seismic joint research method is used to carry out the research from as-pects of well logging and seismic response,vertical and horizontal distribution laws and controlling factors of shell shoals.The results show that shell shoals in Qingshankou Formation of Songliao Basin are mainly distributed in la-custrine mudstone,beach bar sand and sheet sand environment in upper part of Qing1 Member and lower part of Qing2 Member.Shell shoals generally have logging response characteristics of low acoustic time difference,low nat-ural gamma and high resistivity,with lenticular"bright spot"characteristics on seismic profiles,solid circle,el-lipses or irregular lumpy strong-amplitude anomality in seismic amplitude attributes and 3D caving maps,and most-ly show characteristics of certain directional arrangement.Shell shoals are mainly controlled by changes in lake level,paleomorphology and hydro(wind)dynamics.Large lake area and stable water with high lake-surface water level during late Qing1 Member-early Qing2 Member are conducive to the mass reproduction of ostracods,wide and gentle slopes and underwater low uplifts are conducive to the development of shell shoals,and wind-wave action controls the redistribution of shell shoals.The research provides important guiding significance for the study of inter-bedded shale oil reservoirs.