A Study On Reservoir Forming Conditions And Main Controlling Factors Of Oil And Gas Enrichment In Chang 6 Oil Layer Group In Panlong Area

This paper takes Chang 6 reservoir group in Panlong area as the research object,use the geological theory of petroleum geology and sedimentology,combined with a large number of drilling and logging data,well logging data and all kinds of analysis and test data,by combining theoretical and practical research,systematically analyzes the reservoir forming conditions of Chang 6 oil formation in Panlong area,and based on the study of oil and gas distribution characteristics,the main factors controlling oil and gas enrichment are summarized.It is considered that the structure of Chang 6 reservoir group is consistent with sedimentary and regional geological background.The main source rock in the study area is considered to be Chang 7 source rock.Chang 6 reservoir is a very low porosity and ultra-low permeability tight arkose reservoir with strong heterogeneity.The cap rock is mainly distributed in Chang 4 + 5 reservoir and mudstone section at the top of Chang 61 sub formation.The main migration modes of oil and gas are vertical migration and lateral migration.Vertically,the oil layers are mainly developed in the Chang 61 and Chang 62 subgroups,and in the plane,they are mainly distributed in the middle and south of the study area.The enrichment of oil and gas is mainly controlled by the Chang 7 source rock adjacent to the Chang 6 oil-bearing formation,the multi-period superimposed reservoir sand body,the locally developed micro nose uplift and the stable and widely distributed cap rock in the whole area,the oil and gas accumulation model of Chang 7 oil generation,Chang 6 oil storage and Chang 4 + 5 sealing under Panlong area has been formed.