The Sedimentary Facies And Reservoir Comprehensive Evaluation Of Chang 8 Oil-bearing Formation In Huangling Area,Erdos Basin

As an important area in Huangling area,Erdos basin,has attracted much attention,especially Triassic Chang 8 oil-bearing formation is the priority among priorities.Therefore,it is necessary to study the sedimentary reservoir of Chang 8 oil-bearing formation.Firstly,based on the previous research,the paper analyzed the source of the study area according to the data of well drilling,logging and core testing.At the same time,the sign on the basis of the analysis,the sedimentary facies types in Huangling area Triassic Chang 8 oil-bearing formation and characteristics of the recognition,and ultimately portray the sedimentary pattern in Huangling area of the target layer.The conclusion is that the sedimentary environment of Huangling area Chang 8 oil-bearing formation sedimentary period is mainly lake delta,and during the deposition period,it has experienced several stages,such as Expansion of water,the shallow water body and Expansion of water.Based on the detailed analysis of the data of the study area,such as the micro section,the casting thin section and scanning electron microscope,we can know that Erdos basin in Huangling area target layer of feldspar and lithic accounted for relatively high,rock composition maturity is relatively low.And common feldspathic debris sandstone and debris feldspathic sandstone,dominated by secondary pores,secondary pore is very importent,the low porosity and low permeability,the original production capacity is low,the reservoir performance is biased,the reservoir type is mainly low porosity,low permeability and tight.The Reservoir properties of Chang 8 oil-bearing formation in Huangling area affected by the sedimentary environment in sueface,the vertical impact by compaction,cementation and erosion.In the study of sedimentary facies and sand distribution characteristics,reservoir characteristics,the research of diagenesis,and the test results.Thus concluded the reservoir comprehensive evaluation of Chang 8 oil-bearing formationin the Huangling area.Huangling area of Chang 8 oil-bearing formation in common group II,class III reservoir,the characteristics of pore are mainly intergranular pore and intergranular pore and dissolved pore,in which the favorable diagenetic facies is mainly composed of chlorite film-intergranular porefacies,feldspar dissolution-dissolved pore facies,intergranular porefacies and intergranular vugular pore facies.