Ophiolite residual hydrogen production potential evaluation method and electronic device
By reverse derivation and setting baseline standards for the hydrogen production stage, the problem of inaccurate evaluation of the remaining hydrogen production potential of ophiolites in existing technologies has been solved, and a more accurate evaluation has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA UNIV OF MINING & TECH (BEIJING)
- Filing Date
- 2026-04-16
- Publication Date
- 2026-07-14
AI Technical Summary
Current methods for evaluating the remaining hydrogen production potential of ophiolites cannot reflect the true geological hydrogen production situation, leading to inaccurate evaluations.
By using a reverse derivation method, the current contents of olivine, pyroxene and serpentine in ophiolite samples were determined, the degree of alteration and the evolution rate of iron ion valence states were calculated, a baseline standard for the hydrogen production stage was set to verify the accuracy of the data, and then the remaining hydrogen production potential was calculated.
This improves the accuracy of assessing the remaining hydrogen production potential of ophiolites and ensures that the data reflects the true geological hydrogen production situation.
Smart Images
Figure CN122392693A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of geological resource evaluation technology, and in particular to a method and electronic equipment for evaluating the remaining hydrogen production potential of ophiolite. Background Technology
[0002] Serpentinization in water-rock reactions refers to the hydrolysis-redox reaction of olivine, pyroxene, and other magnesium-iron silicate minerals in ultramafic rocks such as peridotite within ophiolite belts with water. This process can naturally generate hydrogen. With the rise of natural hydrogen exploration, ophiolite belts, as high-quality hydrogen source rocks, have become a core exploration target. To evaluate their exploration potential, in addition to conventional geogas detection methods, artificial water-rock reaction experiments, i.e., serpentinization experiments, are increasingly being used to conduct artificial water-rock reaction experiments on crushed samples. The principle of artificial water-rock reaction experiments is as follows: in an artificially controlled temperature and pressure environment, ultramafic minerals such as olivine and pyroxene undergo hydrolysis with water, and the magnesium in the mineral lattice... 2+ Fe 2+ H + Displacement, while Fe 2+ Oxidized to Fe 3+ And release electrons, which react with H in water molecules. + When combined with the generated H2, the mineral itself is transformed into products such as serpentine and magnetite. This experiment is also an important means of studying the formation mechanism of inorganic hydrogen.
[0003] Conducting artificial water-rock reaction experiments can deepen our understanding of the hydrogen production process during serpentinization and provide important support for exploring the hydrogen production patterns of ophiolites. Currently, the industry can use X-ray diffraction (XRD) experiments and low-temperature nitrogen adsorption tests to analyze the mineral composition, water porosity, and other parameters of ophiolite samples to make a preliminary estimate of their hydrogen production capacity after serpentinization; or identify the iron-bearing mineral content in iron-rich rocks through XRD, and calculate it by combining the chemical formula of iron-rich minerals, redox reaction mechanisms, and rock water porosity; or directly crush iron-rich rocks such as ophiolite suites and conduct artificial water-rock reaction experiments to assess their hydrogen production potential. However, the current estimation method involves fully contacting the sample with water or other reaction fluids in artificial water-rock reaction experiments, resulting in a relatively complete reaction process. In contrast, serpentinization hydrogen production under geological historical conditions is constrained by various factors and is difficult to achieve this level of reaction. Therefore, the hydrogen production data obtained from the experiment often exaggerates the actual mineral content involved in the reaction and fails to reflect the true geological hydrogen production situation, leading to inaccurate evaluation of the remaining hydrogen production potential of the ophiolite. Summary of the Invention
[0004] This invention provides a method and electronic device for evaluating the remaining hydrogen production potential of ophiolites, in order to solve the problem that the current estimation methods cannot reflect the true geological hydrogen production situation during the experiment, resulting in inaccurate evaluation of the remaining hydrogen production potential of ophiolites.
[0005] In a first aspect, embodiments of the present invention provide a method for evaluating the remaining hydrogen production potential of ophiolites, comprising: Determine the current contents of olivine, pyroxene, and serpentine in the ophiolite sample; By reverse deduction based on the current contents of olivine, pyroxene and serpentine, the alteration degree of olivine and pyroxene and the iron ion valence state evolution rate of the ophiolite sample can be obtained. Determine whether the degree of alteration, the evolution rate of iron ion valence state, and the current content of serpentine meet the baseline standards for the hydrogen production stage; If the conditions are met, the remaining hydrogen production potential of the ophiolite sample is determined based on the degree of alteration and the evolution rate of iron ion valence states. Among them, the baseline standard for hydrogen production stage is used to characterize the quantitative threshold range of alteration degree, iron ion valence state evolution rate and current serpentine content under different hydrogen production stages.
[0006] In one possible implementation, the baseline criteria for the hydrogen production stage are determined in the following way: Serpentinization experiments were conducted on olivine and pyroxene samples, and the amount of hydrogen generated, the mass fraction, mass data, iron ion valence state evolution ratio, and initial iron ion valence state ratio of the olivine and pyroxene samples, and the mass fraction and mass data of the serpentine samples were recorded at each sampling time. Based on the amount of hydrogen generated at each collection time, the nodes of change in the hydrogen production stage are determined, and the hydrogen production stage is divided into the rising stage, the stable stage, and the declining stage. Based on the mass fractions of olivine and pyroxene samples, the ratio of iron ion valence states, the initial ratio of iron ion valence states, and the mass fraction of serpentine samples at each hydrogen production stage change node, the standard values at each hydrogen production stage change node are determined. Based on the standard values at each hydrogen production stage change node, the quantitative threshold range corresponding to each hydrogen production stage under the baseline standard of the hydrogen production stage is determined.
[0007] In one possible implementation, standard values for each hydrogen production stage are determined based on the mass fractions of olivine and pyroxene samples, the iron ion valence state evolution ratios, the initial iron ion valence state ratios, and the mass fraction of serpentine samples at each hydrogen production stage change node. These values include: For any node in the hydrogen production stage, perform the following steps: Based on the mass fraction of the olivine sample corresponding to the change node of the hydrogen production stage, calculate the standard value of the degree of alteration of the olivine sample at the change node of the hydrogen production stage. Based on the iron ion valence state evolution ratio and the initial iron ion valence state ratio of the olivine sample at the hydrogen production stage change node, calculate the standard value of the iron ion valence state evolution rate of the olivine sample at the hydrogen production stage change node. Based on the mass fraction of the pyroxene sample corresponding to the change node of the hydrogen production stage, calculate the standard value of the degree of alteration of the olivine sample corresponding to the change node of the hydrogen production stage. Based on the iron ion valence state evolution ratio and the initial iron ion valence state ratio of the pyroxene sample at the hydrogen production stage change node, calculate the standard value of the iron ion valence state evolution rate of the pyroxene sample at the hydrogen production stage change node. Based on the mass fraction of the serpentine sample at the change node of the hydrogen production stage, calculate the standard value of the mass fraction of the serpentine sample at the change node of the hydrogen production stage.
[0008] In one possible implementation, the hydrogen production stage is determined based on the hydrogen production rate at each collection time, thus dividing the hydrogen production stage into a rising phase, a stable phase, and a declining phase, including: A curve was plotted based on each sampling time and the amount of hydrogen generated at each sampling time. Calculate the slope at each acquisition time in the curve graph; The sampling time corresponding to the slope that first exceeds the first value is taken as the change node of the first hydrogen production stage. The sampling time corresponding to the slope that is first less than the second value after the first hydrogen production stage change node is taken as the second hydrogen production stage change node; wherein, the first value is greater than the second value; The hydrogen production phase from the start of the reaction to the first hydrogen production stage is defined as the rising phase; the hydrogen production phase between the first and second hydrogen production stage stages is defined as the stable phase; and the hydrogen production phase after the second hydrogen production stage stage stage is defined as the falling phase.
[0009] In one possible implementation, the alteration degree of olivine and pyroxene in the ophiolite sample is derived by reverse deduction based on the current contents of olivine, pyroxene, and serpentine, including: Determine the total mass of the ophiolite sample; Based on the current contents of olivine, pyroxene and serpentine, and the total mass of the ophiolite sample, the original mass of olivine and pyroxene in the ophiolite sample when serpentinization has not occurred is derived in reverse. Calculate the degree of alteration of olivine and pyroxene in the ophiolite sample based on the current content, total mass, and original mass.
[0010] In one possible implementation, the iron ion valence state evolution rate of the ophiolite sample is derived by reverse derivation based on the current contents of olivine, pyroxene, and serpentine, including: Determine the current iron ion valence state ratio of ophiolite samples; Based on the current contents of olivine, pyroxene and serpentine, the original iron ion valence ratios of the ophiolite sample before serpentinization were obtained by reverse deduction. The iron valence state evolution rate of the ophiolite sample was calculated based on the current iron valence state ratio and the original iron valence state ratio.
[0011] In one possible implementation, the remaining hydrogen production potential of the ophiolite sample is determined based on the corresponding hydrogen production stage, alteration degree, and iron ion valence state evolution rate, including: The theoretical maximum hydrogen production is calculated based on the original mass of olivine and pyroxene in the ophiolite sample when they have not undergone serpentinization. Based on the degree of alteration, the evolution rate of iron ion valence state, and the original mass of olivine and pyroxene before serpentinization, the theoretical amount of hydrogen produced is calculated. The difference between the theoretical maximum hydrogen production and the theoretical generated hydrogen production is taken as the remaining hydrogen production potential corresponding to the ophiolite sample.
[0012] In one possible implementation, the baseline criteria for the hydrogen production stage include the quantitative threshold range corresponding to the rising hydrogen production stage, the quantitative threshold range corresponding to the stable hydrogen production stage, and the quantitative threshold range corresponding to the falling hydrogen production stage; determining whether the degree of alteration, the evolution rate of iron ion valence state, and the current content of serpentine meet the baseline criteria for the hydrogen production stage includes: Determine whether the degree of alteration, the evolution rate of iron ion valence state, and the current content of serpentine meet the target quantitative threshold range in the baseline standard for the hydrogen production stage; wherein, the target quantitative threshold range includes the quantitative threshold range for the rising and stable phases of the hydrogen production stage; If the degree of alteration, the rate of iron ion valence state evolution, and the current content of serpentine are all within the standard range corresponding to the rising phase, or are all within the standard range corresponding to the stable phase, then it is determined that it meets the target quantitative threshold range in the baseline standard for the hydrogen production stage. If the degree of alteration, the rate of iron ion valence state evolution, and the current content of serpentine are all within the standard range corresponding to the decline period, then it is determined that it does not meet the target quantitative threshold range in the baseline standard for the hydrogen production stage.
[0013] In one possible implementation, if the condition is not met, the method further includes: If not, return to the step of determining the current content of olivine, pyroxene, and serpentine in the ophiolite sample until the baseline criteria for the hydrogen production stage are met.
[0014] In a second aspect, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect or any possible implementation thereof.
[0015] Considering that conventional estimation methods result in a relatively complete reaction process in artificial water-rock reaction experiments, leading to inaccurate assessments of the remaining hydrogen production potential of ophiolites, this invention addresses this issue by employing a reverse derivation method. Based on the current contents of olivine, pyroxene, and serpentine in the ophiolite sample, the relevant data for olivine and pyroxene in the ophiolite sample before serpentinization are derived, thereby determining the alteration degree of olivine and pyroxene and the iron ion valence state evolution rate of the ophiolite sample. Since data measurement is required before reverse derivation, errors in data measurement can affect the accuracy of the derivation, ultimately impacting the accuracy of the remaining hydrogen production potential corresponding to the ophiolite sample. To avoid this problem, this invention pre-sets a baseline standard for the hydrogen production stage. The reverse-derived data is verified using this baseline standard. Once verification is successful, it is determined that the currently obtained relevant data reflects the true geological hydrogen production situation. Based on this data, the remaining hydrogen production potential corresponding to the ophiolite sample is calculated, thereby improving the accuracy of the assessment of the remaining hydrogen production potential of ophiolites. Attached Figure Description
[0016] Figure 1 This is a flowchart illustrating the implementation of the method for evaluating the remaining hydrogen production potential of ophiolite provided in this embodiment of the invention. Figure 2 This is a graph showing the hydrogen generation curves of olivine and pyroxene at different collection times, provided in an embodiment of the present invention. Figure 3 This is a diagram illustrating the evaluation of the hydrogen production stages of ophiolite using the method for evaluating the remaining hydrogen production potential of ophiolite provided in this embodiment of the invention. Detailed Implementation
[0017] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0018] Figure 1 This is a flowchart illustrating the implementation of the method for evaluating the remaining hydrogen production potential of ophiolite provided in this embodiment of the invention. Figure 1 As shown, the method may include: Step 110: Determine the current content of olivine, pyroxene and serpentine in the ophiolite sample.
[0019] Step 120: Based on the current contents of olivine, pyroxene and serpentine, reverse the derivation to obtain the alteration degree of olivine and pyroxene, and the iron ion valence state evolution rate of the ophiolite sample.
[0020] In this embodiment, the current contents of olivine, pyroxene and serpentine in the ophiolite sample can be determined by experiments such as XRD or scanning electron microscopy (SEM).
[0021] This embodiment combines the law of conservation of elements and, based on the known current contents of olivine, pyroxene, and serpentine, performs reverse derivation to obtain the proportion of olivine and pyroxene in the ophiolite sample that transforms into secondary minerals such as serpentine, as well as the degree of iron valence state transformation during the serpentinization reaction, reflecting the extent of the mineral redox reaction and the iron ion valence state evolution rate.
[0022] Step 130: Determine whether the alteration degree, iron ion valence state evolution rate, and the current serpentine content meet the baseline criteria for the hydrogen production stage. The baseline criteria for the hydrogen production stage are used to characterize the quantitative threshold ranges of alteration degree, iron ion valence state evolution rate, and the current serpentine content under different hydrogen production stages.
[0023] In the reverse derivation process, due to inaccurate preliminary data measurements, inconsistencies between the model corresponding to the serpentine water-rock reaction and the actual reaction path, or instrument measurement errors and mineral composition inhomogeneities introduced during sample testing, the obtained alteration degree, iron ion valence state evolution rate, and current serpentine content will be inaccurate. In such cases, the final evaluation result of the remaining hydrogen production potential will be inaccurate.
[0024] To ensure data accuracy as much as possible, this invention provides a baseline standard for hydrogen production stages. This baseline standard sets quantitative threshold ranges for data at different hydrogen production stages. Only when the relevant data are all within the same hydrogen production stage and meet the criteria for calculating the remaining hydrogen production potential evaluation results are the reverse derivation and measurement data considered accurate and capable of calculation. In this case, the remaining hydrogen production potential evaluation is performed based on the obtained relevant data.
[0025] If it does not meet the requirements, it is considered that there is an inference error, and the process returns to step 110 to determine the current contents of olivine, pyroxene and serpentine in the ophiolite sample until the degree of alteration, the evolution rate of iron ion valence state and the current contents of serpentine meet the baseline criteria for the hydrogen production stage.
[0026] Step 140: If the conditions are met, determine the remaining hydrogen production potential of the ophiolite sample based on the met hydrogen production stage, alteration degree, and iron ion valence state evolution rate.
[0027] In this embodiment, the hydrogen production stages are divided into an ascending stage, a stable stage, and a descending stage. If the degree of alteration, the iron ion valence state evolution rate, and the current content of serpentine meet the quantitative threshold range under the target hydrogen production stage, the remaining hydrogen production potential is calculated.
[0028] The target hydrogen production stage includes the rising phase and the stable phase. This is because the hydrogen production capacity of the ophiolite sample has become weak during the falling phase. At this time, the ophiolite belt corresponding to the ophiolite sample is no longer meaningful for development and collection, so there is no need to calculate the remaining hydrogen production potential.
[0029] Accordingly, the remaining hydrogen production potential can be calculated in the following way: Based on the original masses of olivine and pyroxene in the ophiolite sample before serpentinization, the theoretical maximum hydrogen production is calculated using the following formula:
[0030] In the formula, This represents the theoretical maximum hydrogen production. This represents the original mass of olivine before serpentinization. The molecular mass of olivine is determined by its chemical formula. This represents the mole fraction of Fe in olivine. This represents the original mass of pyroxene before serpentinization. The molecular mass of pyroxene is determined by its chemical formula. The mole fraction of Fe in pyroxene is given by X-ray photoelectron spectroscopy (XPS) or inductively coupled plasma optical emission spectrometry (ICP-OES).
[0031] The theoretical hydrogen production is calculated using the following formula:
[0032] In the formula, This represents the theoretical amount of hydrogen produced. The degree of alteration of olivine; The degree of alteration of pyroxene; The valence state evolution rate of iron ions in the ophiolite sample.
[0033] The difference between the theoretical maximum hydrogen production and the theoretical generated hydrogen production is taken as the remaining hydrogen production potential corresponding to the ophiolite sample, that is:
[0034] In the formula, This represents the remaining hydrogen production potential.
[0035] Therefore, this embodiment of the invention uses a reverse derivation method to deduce the relevant data of olivine and pyroxene in ophiolite samples before serpentinization, based on the current contents of olivine, pyroxene, and serpentine in the ophiolite samples. This allows for the determination of the alteration degree of olivine and pyroxene and the iron ion valence state evolution rate of the ophiolite samples. Since data measurement is required before reverse derivation, errors in the data measurement can affect the accuracy of the derivation, ultimately impacting the accuracy of the remaining hydrogen production potential corresponding to the ophiolite samples. To avoid this problem, this embodiment of the invention pre-sets a baseline standard for the hydrogen production stage. The reverse-derived data is verified using this baseline standard. Once verification is successful, it is determined that the currently obtained relevant data reflects the true geological hydrogen production situation. Based on this data, the remaining hydrogen production potential corresponding to the ophiolite samples is calculated, thereby improving the accuracy of the evaluation of the remaining hydrogen production potential of ophiolites.
[0036] The relevant steps of the present invention will be explained and illustrated below through some optional embodiments: In an optional embodiment, the baseline criterion for the hydrogen production stage is determined in the following manner: Serpentinization experiments were conducted on olivine and pyroxene samples, and the amount of hydrogen generated, the mass fraction, mass data, iron ion valence state evolution ratio, and initial iron ion valence state ratio of the olivine and pyroxene samples, and the mass fraction and mass data of the serpentine sample were recorded at each sampling time.
[0037] Based on the amount of hydrogen generated at each collection time, the nodes of change in the hydrogen production stage are determined, and the hydrogen production stage is divided into the rising stage, the stable stage, and the falling stage.
[0038] Based on the mass fractions of olivine and pyroxene samples, the ratio of iron ion valence states, the initial ratio of iron ion valence states, and the mass fraction of serpentine samples at each hydrogen production stage change node, the standard values at each hydrogen production stage change node are determined.
[0039] Based on the standard values at each hydrogen production stage change node, the quantitative threshold range corresponding to each hydrogen production stage under the baseline standard of the hydrogen production stage is determined.
[0040] The baseline standard for the hydrogen production stage was obtained experimentally. Before conducting the experiment, high-purity olivine and pyroxene samples were selected and the rock blocks were crushed using metal-free equipment, such as an agate crusher. The samples were then sieved through a standard sieve to select particles with a diameter of 0.2-0.3 mm. This was done to balance the reaction rate with particle uniformity and stable specific surface area.
[0041] Then, excessively coarse or fine particles were removed, and the sample was ultrasonically cleaned three times with deionized water to remove surface dust. It was then soaked in anhydrous ethanol for 12 hours to remove organic impurities, vacuum filtered, and dried. Next, the sample was placed in a vacuum drying oven for 24 hours, cooled to room temperature, and then packaged into a sealed agate jar and stored in a desiccator for later use to prevent moisture absorption.
[0042] Before the experiment, the apparatus needs to be purged with nitrogen and helium to remove oxygen and prevent the sample from being oxidized.
[0043] The experiment was divided into a preliminary experiment and a formal experiment. During the experiment, pyroxene and olivine were tested separately. In the preliminary experiment, the amount of hydrogen generated at each sampling time was recorded for both pyroxene and olivine. Based on the hydrogen generation at each sampling time, the hydrogen production stage change nodes were determined, dividing the hydrogen production stage into an upward phase, a stable phase, and a downward phase. The hydrogen production stage change nodes include the first hydrogen production stage change node and the second hydrogen production stage change node. The period from the starting node to the first hydrogen production stage change node is the upward phase, the period between the first and second hydrogen production stage change nodes is the stable phase, and the period after the second hydrogen production stage change node is the downward phase.
[0044] Based on the preliminary experiment, a formal experiment was conducted. During the formal experiment, the hydrogen content generated by olivine and pyroxene during the experiment was collected at preset time intervals, along with the corresponding sample content. Each time a sample was collected, the hydrogen content could be 0.5 mL / sample and the sample content could be 0.1 g / sample. After each sampling, deionized water was promptly added to ensure the stability of the water-rock ratio and temperature and pressure conditions of the system. The reaction was terminated when the hydrogen content was ≤0.01 ppm in three consecutive samples and the cumulative hydrogen production volume remained unchanged.
[0045] Based on the data collected in the formal experiment, and using the data obtained at the first and second hydrogen production stage change nodes determined in the preliminary experiment as a basis, the standard values at the hydrogen production stage change nodes are calculated. Based on each hydrogen production stage change node and the standard values at each hydrogen production stage change node, the quantitative threshold range corresponding to each hydrogen production stage under the baseline standard of the hydrogen production stage is determined.
[0046] In an optional embodiment, standard values for each hydrogen production stage change node are determined based on the mass fractions of olivine and pyroxene samples, the iron ion valence state evolution ratio, the initial iron ion valence state ratio, and the mass fraction of serpentine samples at each hydrogen production stage change node, including: For any node in the hydrogen production stage, perform the following steps: Based on the mass fraction of the olivine sample corresponding to the change node in the hydrogen production stage, calculate the standard value of the degree of alteration of the olivine sample at the change node in the hydrogen production stage.
[0047] Based on the ratio of iron ion valence states and the initial ratio of iron ion valence states of the olivine sample at the change node of the hydrogen production stage, the standard value of the iron ion valence state evolution rate of the olivine sample at the change node of the hydrogen production stage is calculated.
[0048] Based on the mass fraction of the pyroxene sample corresponding to the change node in the hydrogen production stage, calculate the standard value of the alteration degree of the olivine sample corresponding to the change node in the hydrogen production stage.
[0049] Based on the ratio of iron ion valence states and the initial ratio of iron ion valence states of the pyroxene sample at the change node of the hydrogen production stage, the standard value of the iron ion valence state evolution rate of the pyroxene sample at the change node of the hydrogen production stage is calculated.
[0050] Based on the mass fraction of the serpentine sample at the change node of the hydrogen production stage, calculate the standard value of the mass fraction of the serpentine sample at the change node of the hydrogen production stage.
[0051] First, XRD was used to obtain the mass fractions of peridot, pyroxene, and serpentine at different stages, while XPS was used to track the changes in the Fe valence state of peridot and pyroxene at different stages.
[0052] Taking a hydrogen production stage change node as an example, the standard value of the alteration degree of the olivine sample at that hydrogen production stage change node is calculated according to the following formula:
[0053] In the formula, The standard value of the degree of alteration corresponding to node n of the olivine sample during the hydrogen production stage; This represents the mass fraction of the olivine sample at node n during the hydrogen production stage.
[0054] The standard value of the alteration degree of the pyroxene sample at the change node in this hydrogen production stage is calculated using the following formula:
[0055] In the formula, The standard value of the degree of alteration of the pyroxene sample at node n during the hydrogen production stage is given. Let n be the mass fraction of the pyroxene sample at node n during the hydrogen production stage.
[0056] The standard value of the alteration degree of the serpentine sample at the change node in this hydrogen production stage is calculated using the following formula:
[0057] In the formula, The standard value of the degree of alteration corresponding to node n in the hydrogen production stage of the serpentine sample; The mass fraction of the serpentine sample at node n during the hydrogen production stage is denoted as n.
[0058] The formulas for calculating the standard values of the iron ion valence state evolution rate at the hydrogen production stage change nodes are the same for olivine and pyroxene samples:
[0059] In the formula, This is the standard value for the valence state evolution rate of iron ions, i.e., Fe 2+ / Fe 3+ Standard value of the ratio change rate; This represents the initial ratio of the valence states of iron ions, i.e., Fe. 2+ / Fe 3+ Initial ratio; This represents the iron ion valence state evolution ratio of the corresponding sample at node n in the hydrogen production stage.
[0060] The above formula can be used to determine the standard values of each item at the change nodes of the first and second hydrogen production stages.
[0061] In an optional embodiment, based on the amount of hydrogen generated at each collection time, the nodes of the hydrogen production stage are determined to divide the hydrogen production stage into a rising phase, a stable phase, and a declining phase, including: A graph was plotted based on the data collection time and the amount of hydrogen generated at each data collection time.
[0062] Calculate the slope at each acquisition time in the curve graph.
[0063] The sampling time corresponding to the slope that first exceeds the first value is taken as the change node of the first hydrogen production stage. The sampling time corresponding to the slope that is first less than the second value after the first hydrogen production stage change node is taken as the second hydrogen production stage change node; wherein, the first value is greater than the second value.
[0064] The hydrogen production phase from the start of the reaction to the first hydrogen production stage is defined as the rising phase; the hydrogen production phase between the first and second hydrogen production stage stages is defined as the stable phase; and the hydrogen production phase after the second hydrogen production stage stage stage is defined as the falling phase.
[0065] Figure 2 This is a graph showing the hydrogen production of olivine and pyroxene at different collection times, provided by an embodiment of the present invention. The embodiment of the present invention determines the change nodes of the first hydrogen production stage and the second hydrogen production stage by the slope of each collection time in the graph.
[0066] like Figure 2 As shown, the horizontal axis represents time, and the vertical axis represents the amount of hydrogen produced. The slopes of the curves for the pyroxene and olivine samples are similar, suggesting that the same method can be used to divide the hydrogen production stages by the slope characterizing the reaction rate.
[0067] When the rising phase transitions to the stable phase, the rate of change of the slope changes from continuously increasing to relatively stable. Therefore, the first sampling time corresponding to this transition moment is taken as the node of the first hydrogen production stage. When the stable phase transitions to the falling phase, the rate of change of the slope changes from relatively stable to continuously decreasing. Therefore, the first sampling time corresponding to this transition moment after the node of the first hydrogen production stage is taken as the node of the second hydrogen production stage.
[0068] After the division is completed, the hydrogen production stage from the start of the reaction to the first hydrogen production stage change node is designated as the rising period, the hydrogen production stage between the first and second hydrogen production stage change nodes is designated as the stable period, and the hydrogen production stage after the second hydrogen production stage change node is designated as the falling period.
[0069] Accordingly, for the rising phase, the relevant standard value at the first hydrogen production stage change node is used as the upper limit of the quantitative threshold range for the rising phase; for the stable phase, the relevant standard value at the first hydrogen production stage change node is used as the lower limit of the quantitative threshold range for the stable phase, and the relevant standard value at the second hydrogen production stage change node is used as the upper limit of the quantitative threshold range for the stable phase; for the falling phase, the relevant standard value at the second hydrogen production stage change node is used as the lower limit of the quantitative threshold range for the falling phase.
[0070] Figure 3 This is a diagram illustrating the evaluation of the hydrogen production stages of ophiolite using the method for evaluating the remaining hydrogen production potential of ophiolite provided in this embodiment of the invention.
[0071] Figure 3 The X-axis represents the alteration rate of olivine and pyroxene, i.e., the degree of alteration. The Y-axis represents the evolution rate of iron ion valence states. The Z-axis represents the amount of serpentine formed, i.e., the current content.
[0072] The threshold space for the rising phase is located in the lower left region of the figure, corresponding to the interval of low alteration, iron ion valence state evolution rate, and low serpentine formation. In this stage, the serpentinization reaction is in its initial stage, with low consumption of primary minerals, low degree of iron valence state transformation, and the hydrogen production rate is in a rapid rising phase, with high remaining hydrogen production potential.
[0073] The stable period threshold space is located in the middle region of the figure, corresponding to the range of moderate alteration rate, moderate iron ion valence state evolution rate, and moderate serpentine formation. During this stage, the serpentinization reaction enters a vigorous phase, and the hydrogen production rate remains at a high level and relatively stable, representing the main hydrogen production window.
[0074] The threshold space for the descent phase is located in the upper right region of the figure, corresponding to the interval of high alteration rate, high ferric ion valence state evolution rate, and high serpentine formation. In this stage, the serpentinization reaction enters its final stage, a large amount of the original minerals that can participate in the reaction are consumed, the hydrogen production rate declines significantly, and the remaining hydrogen production potential is weak.
[0075] In an optional embodiment, step 120, which involves reverse deduction based on the current contents of olivine, pyroxene, and serpentine to obtain the alteration degree of olivine and pyroxene in the ophiolite sample, may include: The total mass of the ophiolite sample was determined.
[0076] Based on the current contents of olivine, pyroxene, and serpentine, and the total mass of the ophiolite sample, the original mass of olivine and pyroxene in the ophiolite sample before serpentinization is obtained by reverse derivation.
[0077] Calculate the degree of alteration of olivine and pyroxene in the ophiolite sample based on the current content, total mass, and original mass.
[0078] The total mass of the ophiolite sample can also be determined in step 110.
[0079] Accordingly, the original mass of olivine is calculated using the following formula:
[0080] In the formula, This represents the original mass of the peridot. The molecular weight of olivine in the ophiolite sample; The total mass of the ophiolite sample; This represents the current content of peridot, as a percentage. This represents the current content of serpentine, expressed as a percentage. The value represents the molecular weight of serpentine in the ophiolite sample.
[0081] Accordingly, the original mass of pyroxene is calculated using the following formula:
[0082] In the formula, This represents the original mass of pyroxene; The molecular mass of pyroxene in the ophiolite sample; The total mass of the ophiolite sample; This represents the current content of pyroxene; This represents the current content of peridot, as a percentage. This represents the current content of serpentine, expressed as a percentage. The value represents the molecular weight of serpentine in the ophiolite sample.
[0083] Based on the above formula, the degree of alteration of olivine in ophiolite samples is calculated using the following formula:
[0084] In the formula, The degree of alteration of olivine in the ophiolite sample.
[0085] The degree of alteration of pyroxene in ophiolite samples was calculated using the following formula:
[0086] In the formula, The degree of alteration of pyroxene in the ophiolite sample.
[0087] In an optional embodiment, step 120 involves reverse derivation based on the current contents of olivine, pyroxene, and serpentine to obtain the iron ion valence state evolution rate of the ophiolite sample, including: Determine the current iron ion valence state ratio of ophiolite samples.
[0088] By reverse derivation based on the current contents of olivine, pyroxene, and serpentine, the original iron ion valence ratios of the ophiolite sample before serpentinization were obtained.
[0089] The iron valence state evolution rate of the ophiolite sample was calculated based on the current iron valence state ratio and the original iron valence state ratio.
[0090] Similarly, the current iron ion valence ratio of the ophiolite sample can also be measured in step 110.
[0091] The formula for calculating the ratio of the initial iron ion valence states is:
[0092] In the formula, This represents the original iron ion valence ratio of olivine before alteration. This value is determined by testing a 100% pure olivine sample before the actual experiment begins. The ratio of the original iron ion valence states in pyroxene before alteration is given. This value is determined by testing 100% pure pyroxene samples before the actual experiment begins. α is a correction coefficient, the specific value of which can be determined by comparing the mineral composition of unaltered and altered rocks in the experimental area. When experimental data is lacking, a value of 1 can be used.
[0093] Accordingly, the iron ion valence state evolution rate of the ophiolite samples was calculated using the following formula:
[0094] In the formula, The iron ion valence state evolution rate of the ophiolite sample; This represents the current iron ion valence ratio of the ophiolite sample.
[0095] In an optional embodiment, the baseline standard for the hydrogen production stage includes the quantitative threshold range corresponding to the rising hydrogen production stage, the quantitative threshold range corresponding to the stable hydrogen production stage, and the quantitative threshold range corresponding to the falling hydrogen production stage; step 130, determining whether the alteration degree, the iron ion valence state evolution rate, and the current content corresponding to serpentine meet the baseline standard for the hydrogen production stage, may include: Determine whether the degree of alteration, the evolution rate of iron ion valence state, and the current content of serpentine meet the target quantitative threshold range in the baseline standard for the hydrogen production stage; wherein, the target quantitative threshold range includes the quantitative threshold range for the rising and stable phases of the hydrogen production stage.
[0096] If the degree of alteration, the rate of iron ion valence state evolution, and the current content of serpentine are all within the standard range corresponding to the rising phase, or within the standard range corresponding to the stable phase, then it is determined that the target quantitative threshold range in the baseline standard for the hydrogen production stage is met.
[0097] If the degree of alteration, the rate of iron ion valence state evolution, and the current content of serpentine are all within the standard range corresponding to the decline period, then it is determined that it does not meet the target quantitative threshold range in the baseline standard for the hydrogen production stage.
[0098] Table 1 is a baseline standard comparison table for the hydrogen production stage, as shown in Table 1: Table 1. Baseline Standards Comparison Table for Hydrogen Production Stage
[0099] In this embodiment, if the alteration degree of olivine is less than the standard value of alteration degree during the rising phase of olivine, and the alteration degree of pyroxene is less than the standard value of alteration degree during the rising phase of pyroxene, and the current content of serpentine is less than the standard value of mass fraction during the rising phase, and the valence state evolution rate of iron ions is greater than the standard values of evolution rate of olivine and pyroxene during the rising phase, then the above data are determined to meet the baseline standard of the hydrogen production stage and are in the rising phase of the hydrogen production stage.
[0100] If the alteration degree of olivine is greater than or equal to the standard value of alteration degree during the rising phase of olivine, and less than or equal to the standard value of alteration degree during the stable phase of olivine; and the alteration degree of pyroxene is greater than or equal to the standard value of alteration degree during the rising phase of pyroxene, and less than or equal to the standard value of alteration degree during the stable phase of pyroxene; and the current content of serpentine is greater than or equal to the standard value of mass fraction during the rising phase of olivine and pyroxene, and less than or equal to the standard value of mass fraction during the stable phase of olivine and pyroxene; and the evolution rate of iron ion valence state is less than or equal to the standard value of evolution rate during the rising phase of olivine and pyroxene, and greater than or equal to the standard value of evolution rate during the stable phase of olivine and pyroxene, then the above data are determined to meet the baseline standard for the hydrogen production stage and are in the stable phase of the hydrogen production stage. If the alteration degree of olivine is greater than the standard value for alteration degree during the stable period of olivine, and the alteration degree of pyroxene is greater than the standard value for alteration degree during the stable period of pyroxene, and the current content of serpentine is greater than the standard value for the mass fraction during the stable period of olivine and pyroxene, and the evolution rate of iron ion valence state is less than the standard value for the evolution rate during the stable period of olivine and pyroxene, then the above data is determined to meet the baseline standard for the hydrogen production stage and is in the declining phase of the hydrogen production stage. However, this stage does not meet the requirements for calculation, so the remaining hydrogen production potential is not calculated during this stage.
[0101] In summary, this invention provides a baseline standard that clarifies the threshold criteria for different hydrogen production stages of ophiolite, enabling accurate identification of the hydrogen production stage of ophiolite samples. Dividing the ophiolite evolution into three stages—rising, stable, and declining—directly reflects the serpentinization process and changes in hydrogen production capacity. This standard allows for a comprehensive evaluation of the collected sample data, improving data accuracy. Furthermore, this invention provides the remaining hydrogen production potential throughout the entire process. The calculation covers the entire ophiolite cycle, comprehensively utilizing measured parameters such as alteration rate and iron valence state change rate to achieve a digital and quantitative assessment of hydrogen production potential. The results are objective and repeatable.
[0102] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
[0103] This invention also provides an electronic device, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the method described in the above method embodiments.
[0104] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.
[0105] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.
Claims
1. A method for evaluating the remaining hydrogen production potential of ophiolites, characterized in that, include: Determine the current contents of olivine, pyroxene, and serpentine in the ophiolite sample; Based on the current contents of olivine, pyroxene and serpentine, the alteration degree of olivine and pyroxene and the iron ion valence state evolution rate of the ophiolite sample are derived in reverse. Determine whether the degree of alteration, the evolution rate of the valence state of iron ions, and the current content of serpentine meet the baseline standards for the hydrogen production stage; If the conditions are met, the remaining hydrogen production potential of the ophiolite sample is determined based on the met hydrogen production stage, the degree of alteration, and the iron ion valence state evolution rate. The baseline standard for hydrogen production stages is used to characterize the quantitative threshold range of the degree of alteration, the evolution rate of iron ion valence state, and the current content of serpentine under different hydrogen production stages.
2. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 1, characterized in that, The baseline criteria for the hydrogen production stage were determined in the following manner: Serpentinization experiments were conducted on olivine and pyroxene samples, and the amount of hydrogen generated, the mass fraction, mass data, iron ion valence state evolution ratio, and initial iron ion valence state ratio of the olivine and pyroxene samples, and the mass fraction and mass data of the serpentine sample were recorded at each sampling time during the experiment. Based on the amount of hydrogen generated at each collection time, the nodes of change in the hydrogen production stage are determined, and the hydrogen production stage is divided into the rising stage, the stable stage, and the declining stage. Based on the mass fractions of the olivine and pyroxene samples, the iron ion valence state evolution ratios, the initial iron ion valence state ratios, and the mass fraction of the serpentine sample at each hydrogen production stage change node, the standard values at each hydrogen production stage change node are determined. Based on the standard values at each hydrogen production stage change node, the quantitative threshold range corresponding to each hydrogen production stage under the baseline standard of the hydrogen production stage is determined.
3. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 2, characterized in that, The standard values for each hydrogen production stage change node are determined based on the mass fractions of the olivine and pyroxene samples, the iron ion valence state evolution ratios, the initial iron ion valence state ratios, and the mass fraction of the serpentine sample at each hydrogen production stage change node, including: For any node in the hydrogen production stage, perform the following steps: Based on the mass fraction of the olivine sample corresponding to the hydrogen production stage change node, calculate the standard value of the degree of alteration of the olivine sample at the hydrogen production stage change node. Based on the iron ion valence state evolution ratio and the initial iron ion valence state ratio of the olivine sample at the hydrogen production stage change node, calculate the standard value of the iron ion valence state evolution rate of the olivine sample at the hydrogen production stage change node. Based on the mass fraction of the pyroxene sample corresponding to the change node of the hydrogen production stage, calculate the standard value of the degree of alteration of the olivine sample corresponding to the change node of the hydrogen production stage. Based on the iron ion valence state evolution ratio and the initial iron ion valence state ratio of the pyroxene sample at the hydrogen production stage change node, calculate the standard value of the iron ion valence state evolution rate of the pyroxene sample at the hydrogen production stage change node. Based on the mass fraction of the serpentine sample at the hydrogen production stage change node, calculate the standard value of the mass fraction of the serpentine sample at the hydrogen production stage change node.
4. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 3, characterized in that, The hydrogen production stage is determined based on the hydrogen production amount at each collection time, dividing the hydrogen production stage into an upward phase, a stable phase, and a downward phase, including: A curve was plotted based on each collection time and the amount of hydrogen generated at each collection time. Calculate the slope at each acquisition time in the curve graph; The sampling time corresponding to the slope that first exceeds the first value is taken as the change node of the first hydrogen production stage. The sampling time corresponding to the slope that is first less than the second value after the first hydrogen production stage change node is taken as the second hydrogen production stage change node; wherein, the first value is greater than the second value; The hydrogen production phase from the start of the reaction to the first hydrogen production phase change node is defined as the rising phase; the hydrogen production phase between the first hydrogen production phase change node and the second hydrogen production phase change node is defined as the stable phase; and the hydrogen production phase after the second hydrogen production phase change node is defined as the falling phase.
5. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 1, characterized in that, The step of reverse deducing the alteration degree of olivine and pyroxene in the ophiolite sample based on the current contents of olivine, pyroxene, and serpentine includes: The total mass of the ophiolite sample was determined; Based on the current contents of the olivine, pyroxene and serpentine, and the total mass of the ophiolite sample, the original mass of the olivine and pyroxene in the ophiolite sample when they have not undergone serpentinization can be derived in reverse. The degree of alteration of olivine and pyroxene in the ophiolite sample is calculated based on the current content, the total mass, and the original mass.
6. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 1, characterized in that, The process of reverse-engineering the iron ion valence state evolution rate of the ophiolite sample based on the current contents of the olivine, pyroxene, and serpentine includes: The current iron ion valence state ratio of the ophiolite sample was determined; Based on the current contents of olivine, pyroxene and serpentine, the original iron ion valence ratio of the ophiolite sample when serpentinization has not occurred is obtained by reverse derivation; The iron valence state evolution rate of the ophiolite sample is calculated based on the current iron valence state ratio and the original iron valence state ratio.
7. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 1, characterized in that, The determination of the remaining hydrogen production potential corresponding to the ophiolite sample based on the conforming hydrogen production stage, the degree of alteration, and the iron ion valence state evolution rate includes: If the quantitative threshold range of the target hydrogen production stage is met, the theoretical maximum hydrogen production is calculated based on the original mass of the olivine and pyroxene in the ophiolite sample when they have not undergone serpentinization. Based on the degree of alteration, the valence state evolution rate of iron ions, and the original mass of olivine and pyroxene before serpentinization, the theoretical amount of hydrogen produced is calculated. The difference between the theoretical maximum hydrogen production and the theoretical generated hydrogen production is taken as the remaining hydrogen production potential corresponding to the ophiolite sample. The hydrogen production stages are divided into an upward phase, a stable phase, and a downward phase; the target hydrogen production stage includes the upward phase and the stable phase.
8. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 1, characterized in that, The baseline standard for the hydrogen production stage includes the quantitative threshold range corresponding to the rising hydrogen production stage, the quantitative threshold range corresponding to the stable hydrogen production stage, and the quantitative threshold range corresponding to the falling hydrogen production stage; the determination of whether the degree of alteration, the evolution rate of iron ion valence state, and the current content of serpentine meet the baseline standard for the hydrogen production stage includes: If the degree of alteration, the rate of iron ion valence state evolution, and the current content of serpentine are all within the standard range corresponding to the rising phase, or within the standard range corresponding to the stable phase, or within the standard range corresponding to the falling phase, then it is determined that they meet the target quantitative threshold range in the baseline standard for the hydrogen production stage.
9. The method for evaluating the remaining hydrogen production potential of ophiolite according to claim 1, characterized in that, If not, the method further includes: If not, return to the step of determining the current content of olivine, pyroxene, and serpentine in the ophiolite sample until the baseline criteria for the hydrogen production stage are met.
10. An electronic device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in any one of claims 1 to 9.