It is difficult to accurately obtain the permeability of complex lithologic reservoirs using conventional methods because they have diverse pore structures and complex seepage mechanisms.Based on in-depth analysis of ...It is difficult to accurately obtain the permeability of complex lithologic reservoirs using conventional methods because they have diverse pore structures and complex seepage mechanisms.Based on in-depth analysis of the limitation of classical nuclear magnetic resonance(NMR)permeability calculation models,and the understanding that the pore structure and porosity are the main controlling factors of permeability,this study provides a new permeability calculation method involving classifying pore sizes by using NMR T_2 spectrum first and then calculating permeability of different sizes of pores.Based on this idea,taking the bioclastic limestone reservoir in the A oilfield of Mid-East as an example,the classification criterion of four kinds of pore sizes:coarse,medium,fine and micro throat,was established and transformed into NMR T_2 standard based on shapes and turning points of mercury intrusion capillary pressure curves.Then the proportions of the four kinds of pore sizes were obtained precisely based on the NMR logging data.A new NMR permeability calculation model of multicomponent pores combinations was established based on the contributions of pores in different sizes.The new method has been used in different blocks.The results show that the new method is more accurate than the traditional ones.展开更多
The‘Chuju’(楚居),one of the bamboo-slip manuscripts from the Warring States Period kept in the Tsinghua University Library,provides extensive information about the Chu royal dynasty.The‘Chuju’(楚居)acknowledges Ji...The‘Chuju’(楚居),one of the bamboo-slip manuscripts from the Warring States Period kept in the Tsinghua University Library,provides extensive information about the Chu royal dynasty.The‘Chuju’(楚居)acknowledges Jilian(季連),who adopted the surname of Mi(羋),as the founder of the Chu state.However,Jilian is not included among the‘Three Ancestors of Chu’(san Chu xian,三楚先),i.e.Laotong(老童)Zhurong(祝融),and Yuxiong(鬻熊)—also known as Xuexiong(穴熊)—who were jointly invoked and offered sacrifices during the Warring State Period.This article address this question and suggests,based on the records from the‘Chuju’,that Jilian and Yuxiong were brothers,and that the descendants of Yuxiong were those who succeeded to the throne instead of those of Jilian.Since the Chu royal dynasty was related to Yuxiong and not to Jilian,Jilian was not included,because sacrificial rites during the Warring State Period used to emphasize direct bounds with their ancestors.展开更多
文摘It is difficult to accurately obtain the permeability of complex lithologic reservoirs using conventional methods because they have diverse pore structures and complex seepage mechanisms.Based on in-depth analysis of the limitation of classical nuclear magnetic resonance(NMR)permeability calculation models,and the understanding that the pore structure and porosity are the main controlling factors of permeability,this study provides a new permeability calculation method involving classifying pore sizes by using NMR T_2 spectrum first and then calculating permeability of different sizes of pores.Based on this idea,taking the bioclastic limestone reservoir in the A oilfield of Mid-East as an example,the classification criterion of four kinds of pore sizes:coarse,medium,fine and micro throat,was established and transformed into NMR T_2 standard based on shapes and turning points of mercury intrusion capillary pressure curves.Then the proportions of the four kinds of pore sizes were obtained precisely based on the NMR logging data.A new NMR permeability calculation model of multicomponent pores combinations was established based on the contributions of pores in different sizes.The new method has been used in different blocks.The results show that the new method is more accurate than the traditional ones.
基金a key program in research on philosophy and social science‘Recently Discovered Bamboo-slip and Silk Manuscripts and the Reconstruction of Ancient History(09JZD0042)’+2 种基金supported by the Ministry of Education of Chinaas well as the research project in the National Science&Technology Pillar Program‘The Research for the Conservation and Compilation of the Ancient Bamboo and Wooden Slips(2010BAK67B14)’
文摘The‘Chuju’(楚居),one of the bamboo-slip manuscripts from the Warring States Period kept in the Tsinghua University Library,provides extensive information about the Chu royal dynasty.The‘Chuju’(楚居)acknowledges Jilian(季連),who adopted the surname of Mi(羋),as the founder of the Chu state.However,Jilian is not included among the‘Three Ancestors of Chu’(san Chu xian,三楚先),i.e.Laotong(老童)Zhurong(祝融),and Yuxiong(鬻熊)—also known as Xuexiong(穴熊)—who were jointly invoked and offered sacrifices during the Warring State Period.This article address this question and suggests,based on the records from the‘Chuju’,that Jilian and Yuxiong were brothers,and that the descendants of Yuxiong were those who succeeded to the throne instead of those of Jilian.Since the Chu royal dynasty was related to Yuxiong and not to Jilian,Jilian was not included,because sacrificial rites during the Warring State Period used to emphasize direct bounds with their ancestors.
