Favorable Reservoirs And Oil And Gas Distribution Prediction Of Permian Jiamuhe Formation In Block 581 Of Junggar Basin

Block 581 in the northwestern margin of Junggar Basin has rich oil and gas resources,where the main hydrocarbon bearing formation are composed of Jiamuhe group,Upper Wuerhe group and Carboniferous system.However the reservoir characteristics and its control factors are complex,lateral heterogeneities of reservoir are strong,the distribution and scale of reservoir need to be determined,and the next step rolling exploration and evaluation need further implementation and optimization.In this research we mainly focused on the distribution of favorable reservoir and hydrocarbon of Permain Jiamuhe group in Block 032 and 581.This thesis is mostly based on the 3-D seismic data of block 581 in Zhongguai,we established a sequence stratigraphic framework of the target layer and conducted fine seismic structure interpretation and reservoir prediction which helped to figure out the characteristics of the fault system,structural evolution,trap and reservoir of Jiamuhe formation in Block 032 and 581.Block 581 is located in southeast of Kebai fault zone of the northwestern margin of Junggar Basin,and the regional structure,which is a southeast-dipping monocline,lies in the eastern slope belt of the northwestern margin of Junggar Basin.We combined sedimentary microfacies,reservoir characteristics and structural features of the target layer in Permian Jiamuhe group to redefine the 561 fault block traps and 032 fault block traps.By studying the lithology and distribution of volcanic rock bodies in Jiamuhe group using seismic attributes and seismic forward modeling techniques,we analyzed the causes for bad oil testing effects of Well 580.For seismic inversion study,we performed both well logging constrained inversion and seismic waveform inversion for the study area.After comparing the two results,we decided to use well logging constrained inversion method and also combine with seismic attributes,pre-stack AVO attribute and oil-gas detection method to evaluate reservoir distribution,oil and gas distribution inside the target trap and the fracture development.Through the study of known reservoir,we analyzed the reservoir types and forming characteristics and indicated the main control factors of hydrocarbon accumulation.With comprehensive analysis we dentified the favorable area for exploration and provided suggestions for exploration well locations planning,which laid the foundation for the rolling exploration and evaluation of the Permian hydrocarbon exploration of Block 581 in Zhongguai.