Based on the lithologies,sedimentary structures,graptolite zones,inorganic geochemical characteristics,electrical data of 110 shale gas wells in southern Sichuan Basin and the mineral quantitative analysis technology ...Based on the lithologies,sedimentary structures,graptolite zones,inorganic geochemical characteristics,electrical data of 110 shale gas wells in southern Sichuan Basin and the mineral quantitative analysis technology of scanning electron microscope,the stratigraphic sequences of the Upper Ordovician Katian Stage-Himantian Stage-Silurian Rhuddanian Stage-Aeronian Stage are divided,the sedimentary characteristics and fourth-order sequence evolution are analyzed.The target layer can be divided into two sequences,namely SQ1 and SQ2.According to Ordovician-Silurian sedimentary background,the gamma value of the target layer and U/Th,5 maximum flooding surfaces and 12 system tracts are identified.According to system tracts and their combinations,eight fourth-order sequences are identified,namely,Pss1-Pss8 from old to new.The development period and scale of dominant shale facies from Katian stage to Aeronian stage in southern Sichuan are restored.The best-quality dolomite/calcite-bearing siliceous shale facies,siliceous shale facies,clay-bearing siliceous shale facies and feldspar-bearing siliceous shale facies mainly occur in Pss3-Pss5 of Weiyuan,Western Chongqing and Luzhou,Pss6 of Western Changning-Northern Luzhou-Central Western Chongqing and Pss3-Pss4 of Changning.The siliceous clay shale facies second in quality mainly occurs in Pss6 of Southern Luzhou-Changning area(excluding Western Changning area),Pss7 of Eastern Weiyuan-Northern Western Chongqing-Southern Luzhou and Pss8 of Northern Luzhou-Weiyuan-Western Chongqing.The fourth-order sequence evolution model of Katian stage-Aeronian stage in southern Sichuan is established.During the depositional period of Pss1-Pss8,the sea level had six regressions and five transgressions,and the first transgression SQ2-MFS1 after glaciation was the largest flooding surface.展开更多
A new highly sensitive spectroscopy technique-differential photoacoustic spectroscopy (PAS) is presented in this paper. The blood samples from 3 healthy persons, patients with leukemia, patients with pregnancy-induced...A new highly sensitive spectroscopy technique-differential photoacoustic spectroscopy (PAS) is presented in this paper. The blood samples from 3 healthy persons, patients with leukemia, patients with pregnancy-induced hypertension (PIH), and 40 patients with nasopharyngeal carcinoma were measured by the PAS technique. The normalized, the first order, and the second order differential photo-acoustic spectroscopy of the blood were gained. The results show that ( i) weak absorption peaks or shoulder peaks, which could not be found using conventional photoacoustic spectroscopy, were determined by the first order and the second order differential photoacoustic spectroscopy which significantly improve the sensitivity of detection; and (ii) that two characteristic absorption peaks were found at the wavelength of 637 and 664 nm in all persons’ blood samples by the differential photoacoustic spectroscopy technique. This experiment concludes that the differential photoacoustic spectroscopy technique is superior展开更多
基金Supported by the Petro China Major Engineering Technology Field Test Project(2019F-31-01)Postdoctoral Project of Petro China Southwest Oil and Gas Field Company(20200304-03)。
文摘Based on the lithologies,sedimentary structures,graptolite zones,inorganic geochemical characteristics,electrical data of 110 shale gas wells in southern Sichuan Basin and the mineral quantitative analysis technology of scanning electron microscope,the stratigraphic sequences of the Upper Ordovician Katian Stage-Himantian Stage-Silurian Rhuddanian Stage-Aeronian Stage are divided,the sedimentary characteristics and fourth-order sequence evolution are analyzed.The target layer can be divided into two sequences,namely SQ1 and SQ2.According to Ordovician-Silurian sedimentary background,the gamma value of the target layer and U/Th,5 maximum flooding surfaces and 12 system tracts are identified.According to system tracts and their combinations,eight fourth-order sequences are identified,namely,Pss1-Pss8 from old to new.The development period and scale of dominant shale facies from Katian stage to Aeronian stage in southern Sichuan are restored.The best-quality dolomite/calcite-bearing siliceous shale facies,siliceous shale facies,clay-bearing siliceous shale facies and feldspar-bearing siliceous shale facies mainly occur in Pss3-Pss5 of Weiyuan,Western Chongqing and Luzhou,Pss6 of Western Changning-Northern Luzhou-Central Western Chongqing and Pss3-Pss4 of Changning.The siliceous clay shale facies second in quality mainly occurs in Pss6 of Southern Luzhou-Changning area(excluding Western Changning area),Pss7 of Eastern Weiyuan-Northern Western Chongqing-Southern Luzhou and Pss8 of Northern Luzhou-Weiyuan-Western Chongqing.The fourth-order sequence evolution model of Katian stage-Aeronian stage in southern Sichuan is established.During the depositional period of Pss1-Pss8,the sea level had six regressions and five transgressions,and the first transgression SQ2-MFS1 after glaciation was the largest flooding surface.
基金This work was supported by the Provincial Natural Sciences Foundation of Guandong (Grant Nos. 980046, 970088 and 015012).
文摘A new highly sensitive spectroscopy technique-differential photoacoustic spectroscopy (PAS) is presented in this paper. The blood samples from 3 healthy persons, patients with leukemia, patients with pregnancy-induced hypertension (PIH), and 40 patients with nasopharyngeal carcinoma were measured by the PAS technique. The normalized, the first order, and the second order differential photo-acoustic spectroscopy of the blood were gained. The results show that ( i) weak absorption peaks or shoulder peaks, which could not be found using conventional photoacoustic spectroscopy, were determined by the first order and the second order differential photoacoustic spectroscopy which significantly improve the sensitivity of detection; and (ii) that two characteristic absorption peaks were found at the wavelength of 637 and 664 nm in all persons’ blood samples by the differential photoacoustic spectroscopy technique. This experiment concludes that the differential photoacoustic spectroscopy technique is superior
