The Sequence Stratigraphy And Sedimentary Facies Of Member Sha2 Of Eogene In Wen'an Slope Baxian Depression

Wen' an slope is located at the eastern part of Baxian Sag,Jizhong Depression,Hebei Province.Wen'an slope is rich in oil and gas resources.Recent years exploration breakthrough in Member Sha2 of Eogene shows that there has great potential.But complex geological conditions restrict oil exploration and development.This dissertation mainly deals with high-resolution sequence stratigraphy of Es2,and sedimentary facies analysis and subtle reservoir prediction in Wen'an slope.The continental sequence stratigraphy theory is employed.Using 3-D seismic data,cores and well log,high-resolution sequence stratigraphic framework of Es2 is constructed through correlations among wells and seismic profiles.The distribution of sedimentary facies is depict in each system tract and parasequence set.Through the anatomy of reservoir in S3 7 block and reservoir prediction favorable drilling targets have been presented.There are the innovative research results as follow:1.11 third order sequences were developed in Wen'an slope Compare with the central part of Jizhong Depression,SQ4 and SQ5 are not developed.SQ9 is almost equal to Es2.SQ9 is subdivided into 3 system tracts and 5 parasequence sets.2.Each parasequence set is too thin,residual isopach map can't be compiled by conventional methods.A new method is developed to compile residual isopach map,and compiled residual isopach map of each parasequence sets.3.There has been deferent understanding in "tail sandstone" of Esl.By sequence stratigraphic analysis and structural evolution analysis reveal that the" tail sandstone"of Esl is developed in the western part of Wen ' an slope,and it is slope fan controlled by the structural slope break in lowstand system tract of SQ10.4.By using heavy minerals cluster analysis a new branch of delta was found in the northern part of Wen,an slope.3 delta branches were developed in Wen' an slope SQ9,not two as former studies thought.5.In S3 7 block Oil lies in lower part than water in reservoir this has puzzle oil exploration,In this dissertation I found oil reservoir of well S37 and S37-1 belong to parasequence set 2 and parasequence set 4.Reservoir prediction shows that subaqueous distributary channel come from both north and south side of the block.