Characteristics Of Hydrocarbon Carrier And Role In Toutunhe Formation In The No.4 Block Of The Central Part In The Junggar Basin

The trap of Toutunhe Formation in the No.4 block of the central part in the Junggar Basin are characterized by shallow buried depth,long trap-source distance,large differences in trap oil-bearing property and etc.Effective research methods of migration carriers composed of complex sandbodies and faults is exile under the background of deep reservoir.Because of this,by the use of drilling core,formation test,well logging,laboratory analysis and other kinds of data,based on the analysis of regional geological background,Toutunhe Formation in the No.4 block of the central part in the Junggar Basin is selected for the research target in this dissertation,the vertical fault-sealing of strike slip faults and their secondary faults is studied.By analysis of distribution of sedimentary microfacies,characteristic of sandbody distribution and reservoir physical property are evaluated in study area,and finally,seek for new favorable exploration targets.This study not only has important theoretical value,but also has important practical meaning of oil and gas exploration targets' determination in the other block of the central part.Through research papers obtained the following results:The research of reservoir anatomization shows that the No.4 Block of the Central Part in the Junggar Basin mainly developed strike-slip faults.Especially,in well Dong 3-well Dong 1 district as well as the south of well Dong 2 Most faults in the extended tectonic system break through the whole Jurassic stratum.Deep reservoirs mainly distribute in nose structure belts and the formation of reservoir is obviously controlled by structure.In the study area,most of reservoirs are lithology reservoirs and structure-lithologic reservoirs.Hydrocarbon source rock is Badaowan Formation.Reservoir is characterized with low porosity and permeability and strong heterogeneity.Based on the field investigation of faults and the supplementary structure interpretation,this paper takes use of the data of well log to identify the extended tectonic system,summarizes the characteristics of the faults.Whether the activity of faults matches reservoiring period in Paleogene and Neogene is discussed later.After three-dimensional fault closure and parameter correction of the faults in Toutunhe Formation,effective faults' pathways are evaluated.The sandbody's thickness and heterogeneity is very high.Whether the connected sandbody exists is still a problem.Based on the characteristics of sedimentary,well-logging,seismic facies and reservoir modeling on river sandstones,as well as the new reservoir prediction with anomalous body 3D engraving technology,stratal slicing,interpreting with frequency,the favorable reservoir zones are predicted.Finally,based on the favorable reservoir zones and the connectivity,the possibility of lateral migration of oil and gas of transporting layer is evaluated qualitatively.At last,with the combination of hydrocarbon expulsion quantity,the hydrocarbon accumulation model and the effectiveness of fault-sand transport system,this thesis forecast the favorable regional gathering of the No.4 Block of the Central Part in the Junggar Basin.