| Hangjinqi area of North China Bureau of Sinopec is an important oil and gas exploration area,is a major target area of the North China branch of natural gas reserve.But at present,the comprehensive characteristics of tight sandstone reservoir in the area,the main controlling factors and the distribution of high quality reservoir basic geological law remains to be further revealed.To Erdos basin in Hangjinqi area of Shilijiahan zone as the study area,through drilling,logging,seismic analysis and chemical analysis data of the study area of Permian Xiashihezi Formation and development of tight sandstone reservoir characteristics,reservoir diagenesis,analyzed effective reservoir classification and distribution and storage the main controlling factors.The research reveals that the different rock types of Xiashihezi Formation reservoir under the stone which has a certain difference,of which He-1 Member is mainly pebbled lithic sandstone and lithic quartz sandstone,He-2 Member to fine medium grained lithic sandstone,and the He-3 Member of the main coarse-grained lithic sandstone rocks and quartz sandstone.The characteristics of rock and mineral in different layers have obvious differences between the 1 strata,He-1 Member component maturity is slightly higher than the He-2 Member and He-3 Member,while the structural maturity is slightly lower than the He-2 Member and He-3 Member,mainly in the sorting and roundness error and quartz content in many aspects.He-2 Member,He-2 Member and He-3 Member feldspar content less,not more than 50%,of which He-3 Member of feldspar content is the least difference;cementation characteristics of different layers obviously,He-1 Member upper calcareous cementation is strong,slightly lower clay cementation,the main ingredient is kaolinite,He-2 Member,the clay mineral cementation is the main,and a small amount of calcareous cementation,He-3 Member section of calcareous cementation is weak,to siliceous cement mainly,find part of clay cementation.The destructive diagenesis of the reservoir mainly includes cementation and compaction,and the types of the constructive diagenesis mainly include the dissolution,the early lining of chlorite,the feldspar and the rupture of feldspar and so onThe overall density of Xiashihezi Formation reservoir in the research area,with low porosity and low permeability,different layers of reservoir has the difference,on the whole,the He-3 Member,He-2 Member,He-1 Member reservoir petrophysical properties of the overall good.The reservoir pore space types are intergranular dissolution pore expansion and the residual intergranular dissolution fractures,visible visible pore,intragranular dissolved pores,intergranular dissolved pores,with grain dissolution porosity,casting hole,diagenetic crack in different layers.The pore type is different,in general,He-1 Member constitutes intergranular dissolution pore and dissolved fractures,in He-2 consists of Member intergranular pores and residual intergranular pore,He-3 Member is made up of intergranular dissolved pore and micro fracture.System to carry out a comprehensive evaluation of the reservoir is divided into class I,II and III three kinds of effective reservoir types,effective reservoir drilling has the characteristics of reduced from He-1 Member to the overall treatment rate.Each effective reservoir mainly in class II,and relatively high quality by the class I reservoir He-2 Member,He-3 Member,He-1 Member overall development degree of good.The comprehensive study reveals the main control factors of high quality reservoir,puts forward the palaeogeomorphic sedimentary sequence and macro control,the main control factors of reservoir lithology and diagenesis influence.Research shows that the overall level of horizontal ancient landform control reservoirs,low-lying parts reservoir landform of vertical development the quality of the reservoir has obvious characteristics of sequence control,three sequences LST and HST reservoir is relatively well developed;lithology reservoir,coarse sandstone and pebbled sandstone best;different deposition conditions,channel sand body morphology and thickness control reservoir obviously.On the whole,the box type channel sand body is most favorable,the braided channel sand body is better than the meandering river sand body,meandering river inside the beach and river confluence property is better;in the sedimentary background,late diagenesis and hydrocarbon cracking activity and the structure effect It is concluded that the box type coarse sediment,the low level system tract of the three order and the high system tract are favorable for the development of high-quality reservoirs. |
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