The Penglai 9-1 oilfield is the largest granite buried-hill oilfield in China presently,genesis and evolution of the granite buried-hill reservoir is complex.Based on geochemical,geophysical,experimental simulation an...The Penglai 9-1 oilfield is the largest granite buried-hill oilfield in China presently,genesis and evolution of the granite buried-hill reservoir is complex.Based on geochemical,geophysical,experimental simulation and other methods,and combined with field geological observation,genetic mechanism of the granite buried-hill reservoir of the Penglai 9-1 oilfield and its hydrocarbon accumulation mode were well investigated.Results showed that the granite was formed by magmatic intrusion along deep faults under intraplate breakup of North China Plate,it was the product of magmatic activities of Yanshan tectonic episode of Circum-Pacific Tectonic Region,and the intrusion time was 160e170 Ma of the Jurassic.Formation of the granite buried-hill reservoir was mainly controlled by the epigenic karstification and tectonic reconstruction,the Yanshanian weathering and denudation controlled macroscopic development characteristics of the granite buried-hill reservoir,and faults and joints formed by Cenozoic tectonic movement promoted modification of the granite buried-hill reservoir.Laterally,thickness of the granite buried-hill reservoir had a positive correlation with fracture density.Vertically,the granite rocks could be divided into five zones:soil zone,sandy zone,broken zone,fracture zone and base rock zone.The upper-middle part(sandy zone,broken zone,fracture zone)of the granite buried hill was the highquality favorable reservoir zone and the main oil-bearing interval.展开更多
Based on the measurement mechanism of mobility in pressure measurement while drilling, through analyzing a large number of mobility data, it is found that under the condition of water-based mud drilling, the product o...Based on the measurement mechanism of mobility in pressure measurement while drilling, through analyzing a large number of mobility data, it is found that under the condition of water-based mud drilling, the product of mobility from pressure measurement while drilling and the viscosity of mud filtrate is infinitely close to the water phase permeability under the residual oil in relative permeability experiment. Based on this, a method converting the mobility from pressure measurement while drilling to core permeability is proposed, and the permeability based on Timur formula has been established. Application of this method in Penglai 19-9 oilfield of Bohai Sea shows:(1) Compared with the permeability calculated by the model of adjacent oilfields, the permeability calculated by this model is more consistent with the permeability calculated by core analysis.(2) Based on the new model, the correlation between the calculated mobility of well logging and the actual drilling specific productivity index bas been established. Compared with the relationship established by using the permeability model of an adjacent oilfield, the correlation of the new model is better.(3) Productivity of four directional wells was predicted, and the prediction results are in good agreement with the actual production after drilling.展开更多
基金supported by the National Science and Technology Major Project of China(No.2016ZX05024-003).
文摘The Penglai 9-1 oilfield is the largest granite buried-hill oilfield in China presently,genesis and evolution of the granite buried-hill reservoir is complex.Based on geochemical,geophysical,experimental simulation and other methods,and combined with field geological observation,genetic mechanism of the granite buried-hill reservoir of the Penglai 9-1 oilfield and its hydrocarbon accumulation mode were well investigated.Results showed that the granite was formed by magmatic intrusion along deep faults under intraplate breakup of North China Plate,it was the product of magmatic activities of Yanshan tectonic episode of Circum-Pacific Tectonic Region,and the intrusion time was 160e170 Ma of the Jurassic.Formation of the granite buried-hill reservoir was mainly controlled by the epigenic karstification and tectonic reconstruction,the Yanshanian weathering and denudation controlled macroscopic development characteristics of the granite buried-hill reservoir,and faults and joints formed by Cenozoic tectonic movement promoted modification of the granite buried-hill reservoir.Laterally,thickness of the granite buried-hill reservoir had a positive correlation with fracture density.Vertically,the granite rocks could be divided into five zones:soil zone,sandy zone,broken zone,fracture zone and base rock zone.The upper-middle part(sandy zone,broken zone,fracture zone)of the granite buried hill was the highquality favorable reservoir zone and the main oil-bearing interval.
基金Supported by the China National Science and Technology Major Project(2016ZX058-001)the CNOOC Scientific and Technological Project(CNOOC-KJ135-ZDXM36-TJ).
文摘Based on the measurement mechanism of mobility in pressure measurement while drilling, through analyzing a large number of mobility data, it is found that under the condition of water-based mud drilling, the product of mobility from pressure measurement while drilling and the viscosity of mud filtrate is infinitely close to the water phase permeability under the residual oil in relative permeability experiment. Based on this, a method converting the mobility from pressure measurement while drilling to core permeability is proposed, and the permeability based on Timur formula has been established. Application of this method in Penglai 19-9 oilfield of Bohai Sea shows:(1) Compared with the permeability calculated by the model of adjacent oilfields, the permeability calculated by this model is more consistent with the permeability calculated by core analysis.(2) Based on the new model, the correlation between the calculated mobility of well logging and the actual drilling specific productivity index bas been established. Compared with the relationship established by using the permeability model of an adjacent oilfield, the correlation of the new model is better.(3) Productivity of four directional wells was predicted, and the prediction results are in good agreement with the actual production after drilling.
