The measurement range of carbonate content in caustic soda inGB769887 was studied. First the low content measuring value was conducted based on the low measuring limit of the system, then a new measurement range of ...The measurement range of carbonate content in caustic soda inGB769887 was studied. First the low content measuring value was conducted based on the low measuring limit of the system, then a new measurement range of GB769887 was established. This new measurement range was further confirmed by experiments. The results of this study was further confirmed by experiments. The results if this study has greatly expanded the measurement range of GB769887, at the same time provide an effective analytical method for industrial practices.展开更多
Through geological observation, simulation in laboratory and numerical modeling, the factors that control the changes in total organic content (TOC) of source rock have been studied. When the formula DTOC=(TOC0-TOC)/T...Through geological observation, simulation in laboratory and numerical modeling, the factors that control the changes in total organic content (TOC) of source rock have been studied. When the formula DTOC=(TOC0-TOC)/TOC0 (original organic carbon content in the rock) is used to measure the TOC (total organic carbon content) changes in the source rock through geological time, the degrees and directions of such changes are determined by losses and relative amounts both of organic and inorganic matter in the source rock. The DTOC equa-tion, which is used to calculate the loss rate in the process of maturation for the source rock, is therefore obtained by analyzing the mass balance relations. For a certain type of source rock with a certain maturation history, the changes of its TOC respond only to the rates of hydrocarbon generation and expulsion. In actual cases of geological entities, DTOC generally ranges from -0.05 to 0.2, while the calculated reconversion coefficient (k) for organic carbon content remains between 0.90 and 1.25. Only in an ideal situation where there are extremely high rates of hydrocarbon generation and expulsion can the DTOC value experience significant changes, with k reaching up to 2.5. It is concluded, therefore, that the cri-terion for carbonates source rock assessment, based on reconverting the TOC to the value of its original state, may have overestimated the course of the carbon-reduction, which is likely in many cases to make a poor source rock sound better.展开更多
文摘The measurement range of carbonate content in caustic soda inGB769887 was studied. First the low content measuring value was conducted based on the low measuring limit of the system, then a new measurement range of GB769887 was established. This new measurement range was further confirmed by experiments. The results of this study was further confirmed by experiments. The results if this study has greatly expanded the measurement range of GB769887, at the same time provide an effective analytical method for industrial practices.
文摘Through geological observation, simulation in laboratory and numerical modeling, the factors that control the changes in total organic content (TOC) of source rock have been studied. When the formula DTOC=(TOC0-TOC)/TOC0 (original organic carbon content in the rock) is used to measure the TOC (total organic carbon content) changes in the source rock through geological time, the degrees and directions of such changes are determined by losses and relative amounts both of organic and inorganic matter in the source rock. The DTOC equa-tion, which is used to calculate the loss rate in the process of maturation for the source rock, is therefore obtained by analyzing the mass balance relations. For a certain type of source rock with a certain maturation history, the changes of its TOC respond only to the rates of hydrocarbon generation and expulsion. In actual cases of geological entities, DTOC generally ranges from -0.05 to 0.2, while the calculated reconversion coefficient (k) for organic carbon content remains between 0.90 and 1.25. Only in an ideal situation where there are extremely high rates of hydrocarbon generation and expulsion can the DTOC value experience significant changes, with k reaching up to 2.5. It is concluded, therefore, that the cri-terion for carbonates source rock assessment, based on reconverting the TOC to the value of its original state, may have overestimated the course of the carbon-reduction, which is likely in many cases to make a poor source rock sound better.
