Study On Sedimentary Micro Facies And The Reservoir Performance Of Member He8-shan1 In Block Su75 In Sulige Gas Field

Sulige gas field is located near Suligemiao aera,regional structure belongs to the Ordos Basin in northern Yi Shan slope zone,the block Su75 is located in the northern part of the western Sulige gas field.The aera from north to south is 65 km,19.6km wide,more than 885.8km2 large,block Su75 is the main gas filed of Huabei Oilfield in Ordos basin exploration area.The main gas-producting reservoir of Block Su75 is member He8 and Shan1.The main producing gas reservoir Sedimentary facies has been controversial,some scholar considered it to be the delta sedimentary system;others identified the aera as braided river-delta depositional system;another believe the area belongs to braided river delta depositional system.After we observating the core we found that the member He8(bottom)cores typically have a more significant positive rhythm,and see scour surface,such as river bed retention micro facies,as fluvial fine observed by nine core coring wells and description,a comprehensive comparative analysis;and Shan1 core usually has obvious anti rhythm,scour the surface characteristics are not developed,as deltaic deposition.In the matter of research Sulige region,most researchers agree that the area is non-homogeneity of the sand is very strong,low porosity and low permeability reservoirs.However,there are different views that the region is in the reservoir permeability reservoirs.There are some scholars believe that the region's high porosity and permeability reservoirs.Task Force on sedimentary microfacies analysis data,counted eight different phases with coring measured physical property data.Found He8 of porosity and permeability was stronger than the Shan1,the 4th and 5th of He8 member subzone was the best,and was the center of the member He8 of the best beaches microfacies,bed residence deposition followed.Shan1 in mouth bar sedimentary microfacies properties superior to braided channel microfacies.Target layer porosity,permeability,respectively,according to the average value in accordance with ministerial standards,the reservoir layer basic purpose of the study area belong to ultra-low porosity and low permeability.By statistically significant relationship between sand body of rock electrical characteristics,summed up the Block Su75 member He8,Shan1 gas reservoir,gas reservoir containing different logging sequence,the aqueous layer,dry layer corresponding features,comprehensive physical property and sedimentary microfacies make a reasonable basis on features favorable zone prediction,summed up effective sand different sedimentary microfacies distribution characteristics under the law.