CN116415516B - Salty water layer carbon dioxide sequestration potential evaluation method aiming at sea area sedimentary basin - Google Patents
Salty water layer carbon dioxide sequestration potential evaluation method aiming at sea area sedimentary basin Download PDFInfo
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 124
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 67
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 67
- 230000009919 sequestration Effects 0.000 title claims abstract description 58
- 238000011156 evaluation Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000004364 calculation method Methods 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 36
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 10
- 208000035126 Facies Diseases 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 2
- 239000011780 sodium chloride Substances 0.000 abstract description 2
- 239000013049 sediment Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000004062 sedimentation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a method for evaluating the carbon dioxide sequestration potential of a salty water layer aiming at a sea area sedimentary basin, which comprises the steps of establishing a stratum volume model of the sedimentary basin, and dividing a sedimentary stratum in a longitudinal evaluation depth range into a plurality of calculation units from top to bottom according to a certain interval; selecting key parameters and determining the values of the key parameters, wherein the key parameters comprise stratum distribution area, stratum thickness, sand-to-ground ratio, sandstone porosity, carbon dioxide density and the like in a calculation unit; and obtaining the carbon dioxide sealing potential of each calculation unit, and accumulating to obtain the total sealing potential so as to evaluate the carbon dioxide sealing potential. According to the scheme, a model volume method is adopted, the model constraint is utilized to evaluate the carbon dioxide sequestration potential of the sea area sedimentary basin, key parameters are determined, the sequestration potential evaluation is realized based on a specific calculation formula, the evaluation parameters are easy to obtain, the calculated amount is small, the precision is high, the requirement of the sea area large-scale carbon dioxide sequestration potential evaluation of the sea area saline water layer is met, and the method is convenient to widely popularize and apply.
Description
Technical Field
The invention belongs to the field of sea area carbon dioxide geological sequestration, and particularly relates to a salty water layer carbon dioxide sequestration potential evaluation method aiming at sea area sedimentary basin.
Background
The salty water layer carbon dioxide sequestration potential evaluation levels in the overseas and overseas areas have various schemes and are named differently (CSLF, 2005, 2007; USDOE,2010, 2015; bachu et al, 2007; guo Jianjiang et al, 2014), and the maximum scale level takes the whole sedimentation basin as a study object according to the evaluation scale and the data detail level.
Currently, the global salty water layer carbon dioxide sequestration potential evaluation method includes 6 methods, which are respectively proposed by institutions and scholars such as Carbon Sequestration Leaders Forum (CSLF) geological work group, united states department of energy (USDOE) geological work group, united States Geological Survey (USGS), university of california zhou zhouetal (2008) and Shen Pingping (2009). Among the existing evaluation methods, only the united states department of energy geological work group, the united states geological survey agency, and the Carbon Sequestration Leader Forum (CSLF) geological work group have proposed methods for potential evaluation of the entire sedimentary basin, and can be roughly divided into two major categories, the mechanistic method and the volumetric method. The basic principle of the mechanism method is that after carbon dioxide is injected into a target geologic body, the geological sequestration potential of the carbon dioxide in different sequestration modes is calculated respectively by adopting the sequestration modes of formation sequestration, constraint sequestration, dissolution sequestration, mineral sequestration and hydrodynamic sequestration, so that the total sequestration potential is obtained. The basic principle of the volumetric method is to estimate all pore spaces in the geological body which can be used for geological sequestration of carbon dioxide, and further convert the volume into the geological sequestration potential of carbon dioxide under the corresponding sequestration conditions.
Although the potential of various mechanisms is theoretically considered in the existing mechanism method, the potential evaluation results of dissolution and sequestration, constraint and sequestration are influenced by time factors and the accuracy of data value, and accurate data are difficult to obtain under large area scale. At present, the investigation degree of sedimentary basins in the sea area of China is large in difference, the overall exploration degree is low, the data base is different, particularly the investigation degree of basin hydrogeologic features and the like is low, and key parameters are lacking when the evaluation is carried out by using a mechanism method. In addition, the existing volume method parameters aiming at the large-scale sedimentation basin are relatively simple to select, each parameter is selected to be a single value in the longitudinal direction or in the plane, and the evaluation parameters are seriously generalized and have low precision, so that the accuracy of potential evaluation results is low.
Disclosure of Invention
Aiming at the problems that the prior volumetric method is simple in parameter selection, poor in precision and low in accuracy of evaluation results, and the prior mechanical method is complex in parameter selection and is not suitable for evaluating the sealing potential of the sea area sediment basin with low exploration degree, the invention provides a method for evaluating the sealing potential of the carbon dioxide of the salt water layer of the sea area sediment basin, which effectively solves the problem of precision of key parameters in evaluation and improves the scientificity of evaluating the sealing potential of the carbon dioxide of the salt water layer of the sea area basin.
The invention is realized by adopting the following technical scheme: a salty water layer carbon dioxide sequestration potential evaluation method aiming at a sea area sedimentary basin comprises the following steps:
step A, a stratum volume model of a sedimentary basin is established, and sedimentary stratum in a longitudinal evaluation depth range is divided into n calculation units from top to bottom according to a certain interval;
b, selecting key parameters and determining values of the key parameters, wherein the key parameters comprise stratum distribution area, stratum thickness, sand-to-ground ratio, sandstone porosity, carbon dioxide density and effective coefficients of carbon dioxide sequestration in a calculation unit;
and C, obtaining the carbon dioxide sequestration potential of each calculation unit according to the following formula, and accumulating to obtain the total sequestration potential so as to evaluate the carbon dioxide sequestration potential:
V i ＝A i ×H i ×R
wherein:for carbon dioxide sequestration potential, V i For the ith calculation unit sandstone volume, i=1, 2,3. Once again, n is, and (2)>For the ith calculation unit sandstone porosity, ρ i For the ith calculation unit carbon dioxide density under sequestration conditions, A i For the ith calculation unit area, H i For the ith calculated unit formation thickness, R is the sand to ground ratio and E is the effective coefficient of carbon dioxide sequestration.
Further, in the step B, the sandy land ratio R is obtained by:
firstly, counting the percentage F of the sandstone thickness in the drilling of each sedimentary facies in the sedimentary basin to the stratum thickness j The method comprises the steps of carrying out a first treatment on the surface of the Then determining the weight A according to the area of each phase band j And (3) calculating the stratum sand ratio R of the basin by weighted average, wherein the formula is as follows:
wherein: f (F) j The percentage of the sandstone thickness of each sedimentary facies in the basin to the stratum thickness is A j For each deposition zone area within the basin, j=1, 2,3.
Further, in the step B, the ith calculation unit area A i Obtained by calculating the average of the top and bottom surfaces of the calculation unit, respectively.
Further, in the step B, the porosity of the sandstoneObtained by taking an average of the porosity of the sandstone over the depth of each calculation unit.
Further, in the step B, the density ρ of carbon dioxide i Obtained by:
wherein 28.97 is the relative molecular mass of air; z is a compression coefficient; r is R g Is an ideal gas constant; gamma is the relative density of carbon dioxide, D 1 Is the pressure of the sea bottom, G p For basin pressure gradient, T 1 For the seabed temperature, G T For basin geothermal gradient, D k For a certain depth below the sea floor ρ k For carbon dioxide density at a depth below the ocean floor, k=d h ，D h +1，D h +2……D d ，D h For the top depth of the ith calculation unit, D d Is the bottom depth of the i-th calculation unit.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) Compared with the existing mechanism method, the method has the advantages that parameter selection is simple, the calculation process is simple, all calculation parameters are easy to obtain, and the problem that the sea basin cannot be subjected to quick potential evaluation due to low exploration degree and incomplete data mastering is solved.
(2) And the sedimentation basin is longitudinally divided into a plurality of calculation units, parameter values are longitudinally carried out in each calculation unit, the potential of each calculation unit is evaluated and accumulated, and compared with the existing volume method, the method has the advantages that the problems of singleness and high generalization of evaluation parameters are avoided, the accuracy of longitudinal evaluation parameters is improved, and the result is more reliable.
(3) In addition, when the sand-ground ratio of the key parameter is valued, the sand-ground ratio of the representative well drilling of each sedimentary facies belt in the basin is weighted and averaged by establishing a phase control sand-ground ratio calculation model, so that the precision of the key parameter on the plane is improved, and the precision of the evaluation result is further improved.
Drawings
FIG. 1 is a schematic flow chart of a method for evaluating carbon dioxide sequestration potential according to an embodiment of the present invention;
FIG. 2 is a schematic view of a formation volume model according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a phase control sand-to-ground ratio calculation model according to an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be more readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments disclosed below.
The embodiment discloses a method for evaluating the carbon dioxide sequestration potential of a salty water layer aiming at a sea area sedimentary basin, which is shown in figure 1 and comprises the following steps:
step A, a stratum volume model of a sedimentary basin is established, and sedimentary stratum in a longitudinal evaluation depth range is divided into a plurality of calculation units from top to bottom at certain intervals;
step B, selecting key parameters and determining the values of the key parameters: the key parameters include the formation distribution area (A i ) Formation thickness (H) i ) Sand to ground ratio (R), sandstone porosityDensity of carbon dioxide (ρ) i ) And the effective coefficient (E) of carbon dioxide sequestration;
and C, obtaining the carbon dioxide sequestration potential of each calculation unit according to a calculation formula, and accumulating to obtain the total sequestration potential so as to evaluate the carbon dioxide sequestration potential.
For a clearer understanding of the present invention, the following detailed description of the invention is provided in connection with the specific implementation of the process:
in the step A, the stratum volume model is that sedimentary stratum in a longitudinal evaluation depth range is arranged from top to bottom at a certain interval h i Divided into n computing units, saidThe interval is selected by self-definition according to actual conditions, and in theory, the smaller the interval is, the higher the parameter value and the accuracy of the evaluation result are. As shown in fig. 2, each calculation unit has different formation distribution area, geologic volume, sandstone porosity, and carbon dioxide density. And taking the stratum volume model as constraint, and respectively acquiring the parameters of each calculation unit during potential evaluation to describe the spatial heterogeneity of each parameter and improve the potential evaluation precision.
In step B, the selected key parameters include formation distribution area (A i ) Formation thickness (H) i ) Sand to ground ratio (R), sandstone porosityDensity of carbon dioxide (ρ) i ) The effective coefficient (E) of carbon dioxide sealing and storing is obtained by the following steps:
A i area: calculating the average value of the top surface and the bottom surface according to each calculation unit in FIG. 2 based on the deposition thickness map in the evaluation depth range;
H i -formation thickness: based on the evaluation of the deposition thickness map over the depth range, and h in FIG. 2 i Equal;
r-formation sandy land ratio: the ratio of sandstone to formation thickness;
the embodiment builds a phase control sand-ground ratio calculation model: formation sand to land ratio is a key parameter in potential evaluation, and sea drilling data indicate that different sedimentary facies zones have different sand to land ratios. And (3) taking a sediment phase plane graph of the basin as a constraint, and establishing a calculation model of the sediment phases of various types and the sand ratio of the sediment phases accounting for the weight of the evaluation unit, wherein different colors represent different sediment phase types in the model as shown in figure 3.
The formation sand-to-ground ratio is obtained according to a phase control sand-to-ground ratio value method (figure 3). Firstly, counting the percentage F of the sandstone thickness in the drilling of each sedimentary phase zone in the basin to the stratum thickness j Then, the weight A is determined according to the area of each phase band j And (3) calculating the stratum sand-ground ratio R of the basin by weighted average, wherein the calculation formula is as follows:
wherein: r-formation sand to land ratio,%; f (F) j -the percentage,%; a is that j Area of each sedimentary facies zone in basin, m 2 The method comprises the steps of carrying out a first treatment on the surface of the The number of Q-deposition phase bands; a-basin area, m 2 。
Sandstone porosity: the average of the sandstone porosities over this depth range is taken per calculation unit in fig. 2.
ρ i -carbon dioxide density: in fig. 2, each calculation unit takes the average value of the carbon dioxide density in the depth range, and as the carbon dioxide density is greatly changed along with the change of the formation pressure and the temperature, the carbon dioxide density of each depth below the seabed is accurately calculated at intervals of 1 meter, and the calculation formula is as follows:
wherein: 28.97-relative molecular mass of air; z-compression coefficient; r is R g -an ideal gas constant; gamma-carbon dioxide relative density, pure carbon dioxide relative density 1.15192; d (D) 1 -subsea pressure, mpa; g p -basin pressure gradient, mpa/100m; t (T) 1 -subsea temperature, c; g T -basin geothermal gradient, c/100 m; d (D) k -a depth, m, below the sea floor; ρ k Carbon dioxide density at a depth below the sea floor, kg/m 3 ；D h -the top depth, m, of the ith calculation unit; d (D) d -the bottom depth, m, of the ith calculation unit.
Effective coefficient of E-carbon dioxide sequestration: the coefficient is the proportion of the pore space volume occupied by carbon dioxide to the total pore volume, a model is built according to over 20000 hydrocarbon reservoir parameters worldwide by the international energy agency greenhouse gas project (IEAGHG, 2009) (Gorecki et al, 2009), parameters such as effective plane, effective sealed sandstone layer thickness, effective porosity, effective volume, microscopic replacement efficiency and the like are obtained through mathematical simulation at a certain injection rate (maximum of 1 million tons per year), and the sealed effective coefficient of a clastic rock salty water layer in a confidence interval of 10% -90% is respectively 1.2% -4.1%, and the confidence coefficient is respectively 1.2%, 2.4% and 4.1% when the confidence coefficient is 90%, 50% and 10%.
In step C, the calculation formula is as follows:
wherein:
-carbon dioxide sequestration potential, t;
V i -ith calculation unit sandstone volume, m 3 ；
-ith calculation unit sandstone porosity,%;
ρ i -the ith calculation unit carbon dioxide density under sequestration conditions, kg/m 3 ；
A i -ith calculation unit area, m 2 ；
H i -ith calculation unit formation thickness, m;
ratio of R-sandstone thickness to formation thickness,%;
the effective coefficient of E-carbon dioxide sequestration reflects the ratio of the volume of pore space occupied by carbon dioxide to the total pore volume.
In conclusion, the method adopts a model volume method, namely, the model is used for restraining, the carbon dioxide sequestration potential of the saline water layer of the basin is evaluated, the critical parameters are determined, the sequestration potential evaluation is realized based on a specific calculation formula, the calculated amount is small, the precision is high, the requirements of the sea area large-scale carbon dioxide sequestration potential evaluation are met, and the method is convenient to popularize and apply widely.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (4)
1. The method for evaluating the carbon dioxide sequestration potential of the salty water layer of the sea area sedimentary basin is characterized by comprising the following steps of:
step A, a stratum volume model of a sedimentary basin is established, and sedimentary stratum in a longitudinal evaluation depth range is divided into n calculation units from top to bottom according to a certain interval;
b, selecting key parameters and determining values of the key parameters, wherein the key parameters comprise stratum distribution area, stratum thickness, sand-to-ground ratio, sandstone porosity, carbon dioxide density and effective coefficients of carbon dioxide sequestration in a calculation unit;
wherein the sandy land ratio R is obtained by:
firstly, counting the percentage F of the sandstone thickness in the drilling of each sedimentary facies in the sedimentary basin to the stratum thickness j The method comprises the steps of carrying out a first treatment on the surface of the Then determining the weight A according to the area of each phase band j And (3) calculating the stratum sand ratio R of the basin by weighted average, wherein the formula is as follows:
wherein: f (F) j The percentage of the sandstone thickness of each sedimentary facies in the basin to the stratum thickness is A j J=1, 2,3, …, Q is the number of the deposition bands in the basin, and a is the basin area;
and C, obtaining the carbon dioxide sequestration potential of each calculation unit according to the following formula, and accumulating to obtain the total sequestration potential so as to evaluate the carbon dioxide sequestration potential:
V i ＝A i ×H i ×R
wherein:for carbon dioxide sequestration potential, V i For the ith calculation unit sandstone volume, i=1, 2,3, …, n,/-for>For the ith calculation unit sandstone porosity, ρ i For the ith calculation unit carbon dioxide density under sequestration conditions, A i For the ith calculation unit area, H i For the ith calculated unit formation thickness, R is the sand to ground ratio and E is the effective coefficient of carbon dioxide sequestration.
2. The method for evaluating the carbon dioxide sequestration potential of a salty water layer for a sea area sedimentary basin according to claim 1, wherein the method comprises the following steps: in the step B, the ith calculation unit area A i Obtained by calculating the average of the top and bottom surfaces of the calculation unit, respectively.
3. The method according to claim 1The method for evaluating the carbon dioxide sequestration potential of the salty water layer aiming at the sea area sedimentary basin is characterized by comprising the following steps of: in the step B, the porosity of sandstoneObtained by taking an average of the porosity of the sandstone over the depth of each calculation unit.
4. The method for evaluating the carbon dioxide sequestration potential of a salty water layer for a sea area sedimentary basin according to claim 1, wherein the method comprises the following steps: in the step B, the density ρ of carbon dioxide i Obtained by:
wherein 28.97 is the relative molecular mass of air; z is a compression coefficient; r is R g Is an ideal gas constant; gamma is the relative density of carbon dioxide, D 1 Is the pressure of the sea bottom, G p For basin pressure gradient, T 1 For the seabed temperature, G T For basin geothermal gradient, D k For a certain depth below the sea floor ρ k For carbon dioxide density at a depth below the ocean floor, k=d h ,D h +1,D h +2,…,D d ，D h For the top depth of the ith calculation unit, D d Is the bottom depth of the i-th calculation unit.
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