CN112160741B - Method for distinguishing oil-gas-water interface by using core element and method for distinguishing water layer - Google Patents
Method for distinguishing oil-gas-water interface by using core element and method for distinguishing water layer Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 167
- 238000000034 method Methods 0.000 title claims abstract description 80
- 230000002159 abnormal effect Effects 0.000 claims abstract description 101
- 238000005259 measurement Methods 0.000 claims abstract description 80
- 238000005553 drilling Methods 0.000 claims abstract description 31
- 239000011734 sodium Substances 0.000 claims description 26
- 239000000460 chlorine Substances 0.000 claims description 23
- 238000012935 Averaging Methods 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 8
- 230000005856 abnormality Effects 0.000 claims description 6
- 238000011161 development Methods 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 11
- 238000004458 analytical method Methods 0.000 description 10
- 150000002430 hydrocarbons Chemical class 0.000 description 9
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 239000008398 formation water Substances 0.000 description 7
- 239000011435 rock Substances 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention relates to a method for distinguishing an oil-gas-water interface by using core elements and a method for identifying a water layer, belonging to the technical field of petroleum exploration and development. The invention discloses a method for distinguishing an oil-gas-water interface by using core elements, which comprises the following steps: 1) Acquiring content data of target elements in a drilling core of a target well section at each depth measurement point, and determining an abnormal measurement point of the target well section; 2) Identifying the water layer using the determined anomaly measurement points; 3) If the step 2) can identify the water layer, determining a top interface and/or a bottom interface of the water layer section according to the water layer, and further determining an oil-gas-water interface of the target well section; if the water interval cannot be identified according to the step 2), the oil-gas-water interface does not exist in the target well interval. The method for distinguishing the oil-gas-water interface by using the core element is simple, and can quickly, nondestructively and accurately distinguish the oil-gas-water interface on the logging site.
Description
Technical Field
The invention relates to a method for distinguishing an oil-gas-water interface by using core elements and a method for identifying a water layer, and belongs to the technical field of oil-gas exploration and development.
Background
The oil-gas-water interface identification is a very important work in the early stage of oil-gas reservoir development, is the basis of oil-gas reservoir formation characteristics and reservoir parameter research, and accurately defines the effects of subsequent works such as oil reservoir evaluation, oil-gas reservoir calculation, well distribution, perforation scheme design and the like related to the oil-gas-water interface.
Currently, many methods for determining oil-gas-water interfaces in petroleum exploration and development are available, and geochemistry methods and well logging interpretation methods are commonly used. The oil-water interface can be determined to a certain extent by adopting geochemical methods such as quantitative fluorescence and nuclear magnetic resonance through the change of parameters such as oil concentration, oil saturation and the like, but when light oil reservoirs are encountered, the oil layer identification error is larger and the oil-water interface cannot be determined because the fluorescence characteristics are not obvious. The oil-water interface is determined to a certain extent by utilizing the change characteristics of the logging data such as resistivity, neutron and the like, but the oil-gas-water layer of the low-pore-permeability and low-resistance oil-gas reservoir has poor identification capability on the oil-gas-water layer of the oil-gas reservoir by utilizing the logging data because the difference of the water layer and the oil-gas layer on the resistance and neutron curves is smaller. When determining the oil-gas-water interface by the geochemical method and the well logging interpretation method, the characteristics of the oil-gas reservoir need to be analyzed in order to obtain a more accurate oil-gas-water interface, and the method is more complex.
Disclosure of Invention
The invention aims to provide a method for distinguishing an oil-gas-water interface by using core elements, which is simple and high in accuracy.
The invention also provides a method for identifying the water layer by using the core element.
In order to achieve the above purpose, the technical scheme adopted by the method for distinguishing the oil-gas-water interface by using the core element is as follows:
a method for distinguishing an oil-gas-water interface by using core elements comprises the following steps:
1) Setting measuring points of a target well section drilling core at different depths, acquiring content data of a target element at each depth measuring point, and screening out measuring points meeting X/X m to be more than or equal to k from all measuring points as abnormal measuring points; wherein X is the content of the target element of the screening measuring point, X m is the background value of the content of the target element of the target well section, and k is the abnormality judgment multiple; the target element is sodium element or chlorine element;
2) Identifying the aqueous layer by a method comprising the steps of:
a) Taking the first abnormal measuring point from shallow to deep of the drilling core as the initial measuring point of the data segment, and determining the data segment meeting the conditions i) to iv) simultaneously:
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
if the data section meeting the conditions i) to iv) simultaneously is determined, identifying the layer section corresponding to the data section as the water layer of the target well section; if the data segment meeting the conditions i) to iv) simultaneously cannot be determined, performing the following step b);
b) Determining the data segment meeting the conditions i) to iv) simultaneously by using the lower adjacent abnormal measuring point of the initial measuring point when determining the data segment for the previous time as the initial measuring point of the data segment;
c) If the step b) determines that the data segments of the conditions i) to iv) are simultaneously met, identifying the layer segment corresponding to the determined data segment as the water layer of the target well segment, and if the data segment meeting the conditions still cannot be determined, repeating the step b) until the data segment simultaneously meeting the conditions i) to iv) is determined, and identifying the layer segment corresponding to the determined data segment as the water layer; if the step b) is repeated, the data section meeting the condition still cannot be determined, and a water layer does not exist in the target well section;
3) If the step 2) can identify the water layer, determining a top interface and/or a bottom interface of the water layer section according to the water layer, and further determining an oil-water interface of the target well section; if the water layer cannot be identified according to the step 2), the oil-gas-water interface does not exist in the target well section.
The water contained in hydrocarbon reservoirs is generally highly mineralized formation water, containing a relatively high concentration of Na+、Mg2+、K+、Ca2 +、Cl-、SO3 2-、HCO3 -、CO3 2- plasma, where both Na +、Cl- ions are widely present and highest in the formation water and lower in the hydrocarbon core. Meanwhile, the core drilling is the biggest difference from the common drill bit drilling in that the rock is not broken by the drill bit in the drilling process, the core pores are not damaged basically, and the core can completely store the pores therein and the stratum water in the pores. While the salt content of the core of the gas and the core of the water are obviously different. According to the method for distinguishing the oil-gas-water interface by using the core element, the characteristics of formation water and the drilling core obtained by coring are utilized, the content of sodium or chlorine elements in the formation water at different depths of the core is compared, the depth position with abrupt change of the content of the sodium or chlorine elements is used as the oil-gas-water interface or the oil-water interface, the method is simple, and the oil-gas-water interface can be quickly, nondestructively and accurately distinguished on a logging site.
It will be understood that, when step b) is performed for the first time, the initial measurement point when the data segment is determined for the previous time refers to the first abnormal measurement point from shallow to deep in step a), and the adjacent abnormal measurement point below the initial measurement point when the data segment is determined for the previous time is the second abnormal measurement point from shallow to deep. And when the step b) is repeated for the first time in the step c), the initial measuring point when the data segment is determined for the previous time is the second abnormal measuring point from shallow to deep, and the lower adjacent abnormal measuring point of the initial measuring point when the data segment is determined for the previous time is the third abnormal measuring point from shallow to deep.
Further, the method for determining the top interface of the water layer segment comprises the following steps: and averaging the depth value of the abnormal measuring point with the minimum depth of the determined water layer and the depth value of the measuring point adjacent to the upper part of the abnormal measuring point with the minimum depth to obtain the depth value of the top interface of the water layer segment. The method for determining the bottom interface of the water layer section comprises the following steps: and averaging the depth value of the abnormal measuring point with the maximum depth of the determined water layer and the depth value of the measuring point adjacent to the lower part of the abnormal measuring point with the maximum depth to obtain the depth value of the bottom interface of the water layer segment.
As the top interface depth of the water interval is noted as H 1, it is understood that H 1 is the average of the corresponding depths of the anomaly measurement point for which the determined depth of the water layer is the smallest and the measurement point adjacent to it above. If the depth of the abnormal measuring point with the minimum depth of the water layer corresponds to the depth H 11, the depth corresponding to the adjacent non-abnormal constant measuring point at the upper part is H 10. Then the water layer segment top depth H 1＝H10*0.5+H11 x 0.5 is defined, i.e., the water layer segment top depth H 1 is the average of H 10 and H 11, which ensures that the error accuracy is half the measurement interval. Similarly, if the bottom interface depth of the water layer segment is denoted as H 2, it is understood that H 2 is the average value of the depths corresponding to the constant measurement point with the greatest depth of the determined water layer segment and the adjacent measurement point below. If the depth of the determined maximum measurement point of the water layer is H 20 and the depth of the lower adjacent constant measurement point is H 21, H 2＝H20*0.5+H21 is 0.5.
Further, the method for determining Xm is as follows:
when a non-reservoir section exists in the target well section, taking the average value of the target element content of the non-reservoir section as the value of Xm;
When the target well section does not have a non-reservoir section, if the gas layer section exists, the average value of the target element content of the gas layer section is Xm, and if the gas layer section does not exist, the background value of the target element content of the adjacent well in the area where the target well section exists is used as Xm; the gas layer section is interpreted from a well log. The adjacent well refers to an oil-gas well which is close to the target well section in the area where the target well section is located and has the target element content data of the non-reservoir section or the gas layer section, preferably the oil-gas well which is closest to the target well section and has the target element content data of the non-reservoir section or the gas layer section, and the background value of the target element content of the adjacent well is the average value of the target element content of the adjacent well reservoir section or the gas layer section.
For example, the gas interval may be determined from a hydrocarbon measurement while drilling or from a log. Because mudstones generally belong to non-reservoir sections, the core of the drilling core can be counted, and the average content of target elements in the mudstones is taken as the value of Xm.
Furthermore, in order to improve the accuracy of the discrimination of the oil-gas-water interface, the interval between any two adjacent measuring points in the target well section is 5-30 cm.
Further, in step 1), the data acquisition method includes the following steps: and airing the drilling core, and then analyzing element content of the drilling core at each set distance. The drying mode is preferably natural drying. After the core is dried, water in the core is evaporated, but salt minerals in the core can be crystallized and remain in the pores and cannot be lost.
Further, the data is obtained by scanning the drill core in a core scanning analyzer. By means of core element scanning, the content of elements at different depth positions of the core is analyzed at small intervals (the measurement accuracy is about 0.1 m), oil-gas-water interfaces can be rapidly, nondestructively and accurately identified on a logging site, and the method has a wide application prospect in the field of logging. Under normal conditions, the core is integrally put into an instrument, element analysis is performed on the core sample at small intervals, the analyzed element types are 'Na, mg, al, si, P, S, cl, K, ca, ba, ti, mn, fe, V, ni, sr, zr' 17 elements, the types contain 'Na, mg, S, cl, K, ca' 6 important elements contained in formation water, and the content of the 6 elements can be checked through core element analysis. Besides nondestructive analysis by adopting a core scanning analyzer, the element content can be sampled and analyzed at different depths of the drilling core.
The method for identifying the water layer by using the core element adopts the following technical scheme:
A method for identifying a water layer using a core element, comprising the steps of:
1) Setting measuring points of a target well section drilling core at different depths, acquiring content data of a target element at each depth measuring point, and screening out measuring points meeting X/X m to be more than or equal to k from all measuring points as abnormal measuring points; wherein X is the content of the target element of the screening measuring point, X m is the background value of the content of the target element of the target well section, and k is the abnormality judgment multiple; the target element is sodium element or chlorine element;
2) Identifying the aqueous layer by a method comprising the steps of:
a) Taking the first abnormal measuring point from shallow to deep of the drilling core as the initial measuring point of the data segment, and determining the data segment meeting the conditions i) to iv) simultaneously:
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
if the data section meeting the conditions i) to iv) simultaneously is determined, identifying the layer section corresponding to the data section as the water layer of the target well section; if the data segment meeting the conditions i) to iv) simultaneously cannot be determined, performing the following step b);
b) Determining the data segment meeting the conditions i) to iv) simultaneously by using the lower adjacent abnormal measuring point of the initial measuring point when determining the data segment for the previous time as the initial measuring point of the data segment;
c) If the step b) determines that the data segments of the conditions i) to iv) are simultaneously met, identifying the layer segment corresponding to the data segment determined in the step b) as the water layer of the target well segment, and if the data segment meeting the conditions still cannot be determined, repeating the step b) until the data segment simultaneously meeting the conditions i) to iv) is determined, and identifying the layer segment corresponding to the determined data segment as the water layer; if the data segment meeting the condition still cannot be determined by repeating the step b), the water layer does not exist in the target well segment.
According to the method for identifying the water layer by using the core elements, disclosed by the invention, by utilizing the characteristics of formation water and the drilling core obtained by coring, the depth positions of abrupt changes in the sodium and/or chlorine element content in the formation water are used as a gas-water interface or an oil-water interface by comparing the content of the sodium and/or chlorine element in the core at different depths, and the method is simple, so that the water layer can be rapidly, nondestructively and accurately determined on a logging site.
Further, the method for determining Xm is as follows:
when a non-reservoir section exists in the target well section, taking the average value of the target element content of the non-reservoir section as the value of Xm;
When the target well section does not have a non-reservoir section, if the gas layer section exists, the average value of the target element content of the gas layer section is Xm, and if the gas layer section does not exist, the background value of the target element content of the adjacent well in the area where the target well section exists is used as Xm; the gas layer section is interpreted from a well log.
Further, the interval between any two adjacent measuring points in the target well section is 5-30 cm.
Further, in step 1), the data acquisition method includes the following steps: and airing the drilling core, and then analyzing element content of the drilling core at each set distance.
Further, the data is obtained by scanning the drill core in a core scanning analyzer.
In the method for distinguishing the oil-gas-water interface by using the core element and the method for distinguishing the water layer by using the core element, the anomaly judgment multiple k can be determined by adopting an adjacent well comparison method: namely, an oil-gas well with a known water layer in a target area and the closest distance from a target well section is selected as a neighboring well for comparison, the ratio of the content of target elements of sampling points in the water layer of the neighboring well for comparison to the average value of the content of target elements in a non-reservoir or a gas layer of the neighboring well for comparison is calculated, and the minimum ratio obtained by calculation is taken as the value of k.
Drawings
FIG. 1 is a log of core elements of a target wellbore section of a J1 well in accordance with an embodiment of the present invention;
FIG. 2 is a diagram showing the characteristics of a water layer of a J1 well in an embodiment of the invention;
Fig. 3 is a log of core elements of a J2 well target wellbore section in an embodiment of the invention.
Detailed Description
The following will further describe the technical scheme of the present invention with reference to a specific embodiment, taking a certain oil reservoir as an example.
Example 1
The method for distinguishing the oil-gas-water interface by using the core element in the embodiment takes a certain well section of a J1 well of a certain gas reservoir as a target well section, and comprises the following steps:
1) Drilling and coring a target well section, naturally airing the obtained core, setting measuring points at intervals of 5-20 cm, carrying out scanning analysis on the core by using a core scanning analyzer to determine the element content (mass) of each measuring point of the core, obtaining data of Na element content changing along with depth, and carrying out statistics on lithology of the core, wherein specific analysis and statistical results are shown in Table 1;
TABLE 1 analysis, statistics and calculation results
2) The target well section of the well has a non-reservoir section mudstone section 3341.281-3343.126m, the average value of Na elements of the mudstone section is 0.325%, so that the background content Xm of Na elements of the target well section is 0.325%, and then the ratio of the Na element content value to Xm at each depth measurement point is calculated, and the result is shown in Table 1.
Calculating an abnormality judgment multiple k of the target well section by an adjacent well comparison method: selecting an oil gas well with a known water layer and the closest distance from the target well section as a comparison adjacent well in the area of the target well section, wherein the comparison adjacent well meeting the condition is an L1 well; given that there are 12 sampling points in the water layer of the L1 well, the mass percentage of Na element in each sampling point is 2.691%, 3.251%, 2.322%, 2.521%, 4.332%, 3.985%, 2.116%, 2.883%, 3.224%, 3.696%, 3.994%, 3.225%, and the average value (i.e. background value) of the mass percentage of Na element in the non-reservoir layer of the L1 well is 0.421%, the ratio of Na element to background value in each sampling point of the water layer of the L1 well is 6.39, 7.72, 5.52, 5.99, 10.29, 9.47, 5.03, 6.85, 7.66, 8.78, 9.49, 7.66, wherein the minimum value of the ratio is 5.03, and k=5.03.
Accordingly, measuring points with the multiple of more than or equal to 5.03 are screened out, and specifically measuring points with the numbers of 9-14, 22 and 24 are selected, and the 8 measuring points are abnormal measuring points of a target well section;
3) The aqueous layer is then identified using a method comprising the steps of: taking the first abnormal measurement point (numbered 9) from shallow to deep of the drilling core as the initial measurement point of the data segment, searching the data segment which simultaneously meets the conditions i) to iv):
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
Meanwhile, the data segments meeting the conditions i) to iv) are data segments between the measuring points 9 to 14, and the layer segment corresponding to the data segment is identified as the water layer of the target well segment;
4) The depth value corresponding to the measuring point (measuring point with the number of 9) with the smallest depth of the water layer identified in the step 3) is 3339.364m, and the depth value corresponding to the measuring point (measuring point with the number of 14) with the largest depth is 3339.942m;
And (3) averaging the depth values corresponding to the measuring points with the number 9 and the measuring points with the number 8 to be 3339.314m, and averaging the depth values corresponding to the measuring points with the number 14 and the measuring points with the number 15 to be 3339.992m, so that the oil-gas-water interface of the target well section is positioned at 3339.314m and 3339.992m, wherein the position 3339.314m is the top interface depth of the water layer section, and the position 3339.992m is the bottom interface depth of the water layer section.
Example 2
The method for distinguishing the oil-gas-water interface by using the core element in the embodiment also takes a certain well section of the J1 well of a certain gas reservoir in the embodiment 1 as a target well section, and comprises the following steps:
1) According to the step 1) of the embodiment 1, when the element content (mass) of each measuring point of the core is measured by utilizing a core scanning analyzer to scan and analyze the core, the data of the change of the Cl element content along with the depth are obtained at the same time, and the concrete is shown in the table 1;
2) The target well section of the well has a non-reservoir section mudstone section 3341.281-3343.126m, the average value of Cl elements of the mudstone section is 0.144%, so that the background content Xm of Cl elements of the target well section is 0.144%, and then the ratio of the Cl element content value to Xm at each depth measurement point is calculated, and the result is shown in Table 1.
The content of Cl elements at 12 sampling points of the water layer of the L1 well selected in example 1 was 1.009%, 0.992%, 0.894%, 0.953%, 1.468%, 1.312%, 0.823%, 1.221%, 1.075%, 1.335%, 1.316%, 1.095, and the average value of Cl element mass% of the non-reservoir layer of the L1 well (i.e., background value) was 0.166%, and the ratio of Cl elements at each sampling point of the water layer of the L1 well to background value was 6.08, 5.98, 5.39, 5.74, 8.84, 7.90, 4.96, 7.36, 6.48, 8.04, 7.93, 6.60, respectively, wherein the minimum value of the ratio was 4.96, and k=4.96.
Accordingly, measuring points with the multiple of more than or equal to 4.96 are screened out, and specifically measuring points with the numbers of 9-14, 24 and 31 are selected, and the 8 measuring points are abnormal measuring points of a target well section;
3) The aqueous layer is then identified using a method comprising the steps of: taking an abnormal measurement point (numbered 9) of the first one of the drilling cores from shallow to deep as a starting measurement point of the data segment, and searching the data segment which simultaneously meets the conditions i) to iv):
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
Meanwhile, the data segments meeting the conditions i) to iv) are data segments between the measuring points 9 to 14, and the layer segment corresponding to the data segment is identified as the water layer of the target well segment;
4) The depth value corresponding to the measuring point (measuring point with the number of 9) with the smallest depth of the water layer identified in the step 3) is 3339.364m, and the depth value corresponding to the measuring point (measuring point with the number of 14) with the largest depth is 3339.942m;
And (3) averaging the depth values corresponding to the measuring points with the number 9 and the measuring points with the number 8 to be 3339.314m, and averaging the depth values corresponding to the measuring points with the number 14 and the measuring points with the number 15 to be 3339.992m, so that the oil-gas-water interface of the target well section is positioned at 3339.314m and 3339.992m, wherein the position 3339.314m is the top interface depth of the water layer section, and the position 3339.992m is the bottom interface depth of the water layer section.
The hydrocarbon-water interface of the target wellbore section determined in this example is identical to the hydrocarbon-water interface determined in example 1.
Core element logs for a target interval (i.e., a certain interval of the J1 well described above) may be obtained using the contents of table 1, as shown in fig. 1. Because the water layer has the characteristics of obviously reduced resistivity and obviously reduced total hydrocarbon value compared with a typical hydrocarbon layer, the prior art generally adopts a logging curve and gas logging curve related discipline to comprehensively judge the water layer according to the response characteristics of the water layer. For a well J1, the depth of the water layer is considered to be 3339.314m-3339.992m by utilizing the change characteristic analysis of the corresponding characteristics. As shown in FIG. 2, the resistivity of the layer of logging is reduced from the upper 50.5 omega-m to 16.8 omega-m, the gas logging total hydrocarbon value is reduced from 5.59% to 0.53%, and the characteristics of the water outlet layer are verified by the logging curve and the total hydrocarbon curve, so that the method for distinguishing the oil-gas-water interface by using the core element has higher accuracy.
Example 3
The method for distinguishing the oil-gas-water interface by using the core element in the embodiment takes a section of a J2 well of a certain gas reservoir as a target well section, and comprises the following steps:
1) Drilling a certain section of a target well, naturally airing the obtained rock core, setting measuring points at intervals of 7-28 cm, carrying out scanning analysis on the rock core by using a rock core scanning analyzer to determine the element content (mass) of each depth measuring point of the rock core, obtaining data of Na element content changing along with depth, and carrying out statistics on lithology of the rock core, wherein the concrete analysis and the statistics result are shown in Table 2;
TABLE 2 analysis, test and calculation results
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2) Since the lithology of the core section is sandstone and no non-reservoir section exists, the depth of the gas layer section of the identification target layer section is 3315.861-3317.732m according to the gas-measurement full hydrocarbon curve, the average content of Na elements in the gas layer section is 1.058%, the background content Xm of Na elements in the target well section is 1.058%, and then the ratio of the content value of Na elements to Xm at each depth measurement point is calculated, and the result is shown in Table 2.
Calculating an abnormality judgment multiple k of the target well section by an adjacent well comparison method: selecting an oil gas well with a known water layer and the closest distance from the target well section as a comparison adjacent well in the area of the target well section, wherein the comparison adjacent well meeting the condition is an L2 well; it is known that there are 9 sampling points in the water layer of the L2 well, the mass percentage of Na element in each sampling point is 2.322%, 3.521%, 3.122%, 2.639%, 2.335%, 2.192%, 2.039%, 1.887%, 2.632%, the average value (i.e. background value) of the mass percentage of Na element in the water layer of the L2 well is 0.963%, and the ratio of Na element to background value in each sampling point in the water layer of the L2 well is 2.41, 3.66, 3.24, 2.74, 2.42, 2.28, 2.12, 1.96, 2.73, wherein the minimum value of the ratio is 1.96, and k is determined as k=1.96.
Accordingly, measuring points with the multiple of more than or equal to 1.96 are screened out, specifically measuring points with the numbers of 29 to 38, 41 to 42, 45, 47 to 49, 51 to 52, 55 to 56 and 59 to 64, and the 26 measuring points are abnormal measuring points of a target well section;
3) The aqueous layer is then identified using a method comprising the steps of: searching for a data segment meeting the conditions i) to iv) by using the initial measurement point of the first abnormal measurement point (number 29) of the drilling core from shallow to deep as the data segment:
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
The data segment meeting the conditions i) to iv) is the data segment between the measuring points 29 to 64, and the layer segment corresponding to the data segment is identified as the water layer of the target well segment;
4) The depth value corresponding to the measuring point (measuring point with the number of 29) with the smallest depth of the water layer identified in the step 3) is 3317.938m, and the depth value corresponding to the measuring point (measuring point with the number of 64) with the largest depth is 3321.848m;
and (3) averaging the depth values corresponding to the measuring point with the number 29 and the measuring point with the number 28 to be 3317.835m, averaging the depth values corresponding to the measuring point with the number 64 and the measuring point with the number 65 to be 3321.898m, and then, the oil-gas-water interface of the target well section is positioned at 3317.835m and 3321.898m, wherein the position 3317.835m is the top interface depth of the water layer section, and the position 3321.898m is the bottom interface depth of the water layer section.
Example 4
The method for distinguishing the oil-gas-water interface by using the core element in the embodiment also takes a certain well section of the J2 well of a certain gas reservoir in the embodiment 3 as a target well section, and the specific distinguishing method comprises the following steps:
1) According to the step 1) of the embodiment 3, when the element content (mass) of each depth measurement point of the core is measured by utilizing a core scanning analyzer to scan and analyze the core, data of the change of the Cl element content along with the depth are obtained at the same time, and the data are specifically shown in Table 2;
2) The target well section of the well does not have a non-reservoir section, the depth of the gas layer section of the target well section is 3315.861-3317.732m according to the gas-measurement full hydrocarbon curve, the average content of Cl elements in the gas layer section is 1.966%, the background content Xm of the Cl elements in the target well section is 1.966%, and then the ratio of the content value of the Cl elements to Xm at each depth measurement point is calculated, wherein the result is shown in Table 2.
The content of Cl elements at 9 sampling points of the water layer of the L2 well selected in example 3 is 4.935%, 6.962%, 5.338%, 6.176%, 7.673%, 6.329%, 4.029%, 3.587%, 6.356%, the average value of the Cl element mass percentages of the water layer of the L2 well (i.e., background value) is 1.759%, and the ratio of Cl element to background value at each sampling point of the water layer of the L2 well is 2.81, 3.96, 3.03, 3.51, 4.36, 3.60, 2.29, 2.04, 3.61, where the minimum value of the ratio is 2.04, and k is determined as k, i.e., k=2.04.
Accordingly, measuring points with the multiple of more than or equal to 2.04 are screened out, and specifically measuring points with the numbers of 29, 31-32, 34-36, 38, 41-42, 45, 47-48, 51-52, 55-56, 59 and 61-63 are selected, wherein the 20 measuring points are abnormal measuring points of a target well section;
3) The aqueous layer is then identified using a method comprising the steps of: searching for a data segment meeting the conditions i) to iv) by using the initial measurement point of the first abnormal measurement point (number 29) of the drilling core from shallow to deep as the data segment:
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
the data segment meeting the conditions i) to iv) is the data segment between the measuring points 29 to 63, and the data segment is identified as the water layer of the target well segment;
4) The depth value corresponding to the measuring point (measuring point with the number of 29) with the smallest depth of the water layer identified in the step 3) is 3317.938m, and the depth value corresponding to the measuring point (measuring point with the number of 63) with the largest depth is 3321.748m;
And (3) averaging the depth values corresponding to the measuring point with the number 29 and the measuring point with the number 28 to be 3317.835m, and averaging the depth values corresponding to the measuring point with the number 63 and the measuring point with the number 64 to be 3321.798m, so that the oil-gas-water interface of the target well section is positioned at 3317.835m and 3321.798m, wherein the position 3317.835m is the top interface depth of the water layer section, and the position 3321.798m is the bottom interface depth of the water layer section.
Using the Na element and Cl element content data in table 2 of example 3, a J2 well target interval core element log can be obtained as shown in fig. 3. As can be seen from fig. 3, the method is effective in identifying water intervals for wells where the log is insensitive to hydrocarbon-water layer response.
Embodiments of a method for identifying a water layer using core elements
Example 5
The method for identifying the water layer by using the core element in this embodiment is the same as steps 1) to 3) in embodiment 1, and will not be described here again.
Example 6
The method for identifying the water layer by using the core element in this embodiment is the same as steps 1) to 3) in embodiment 2, and will not be described here again.
Example 7
The method for identifying the water layer by using the core element in this embodiment is the same as steps 1) to 3) in embodiment 3, and will not be described here again.
Example 8
The method for identifying the water layer by using the core element in this embodiment is the same as steps 1) to 3) in embodiment 4, and will not be described here again.
Claims (8)
1. A method for distinguishing an oil-gas-water interface by using core elements is characterized by comprising the following steps: the method comprises the following steps:
1) Setting measuring points of a target well section drilling core at different depths, acquiring content data of a target element at each depth measuring point, and screening out measuring points meeting X/X m to be more than or equal to k from all measuring points as abnormal measuring points; wherein X is the content of the target element of the screening measuring point, X m is the background value of the content of the target element of the target well section, and k is the abnormality judgment multiple; the target element is sodium element or chlorine element; the interval between any two adjacent measuring points in the target well section is 7-20 cm;
2) Identifying the aqueous layer by a method comprising the steps of:
a) Taking the first abnormal measuring point from shallow to deep of the drilling core as the initial measuring point of the data segment, and determining the data segment meeting the conditions i) to iv) simultaneously:
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
if the data section meeting the conditions i) to iv) simultaneously is determined, identifying the layer section corresponding to the data section as the water layer of the target well section; if the data segment meeting the conditions i) to iv) simultaneously cannot be determined, performing the following step b);
b) Determining the data segment meeting the conditions i) to iv) simultaneously by using the lower adjacent abnormal measuring point of the initial measuring point when determining the data segment for the previous time as the initial measuring point of the data segment;
c) If the step b) determines that the data segments of the conditions i) to iv) are simultaneously met, identifying the layer segment corresponding to the determined data segment as the water layer of the target well segment, and if the data segment meeting the conditions still cannot be determined, repeating the step b) until the data segment simultaneously meeting the conditions i) to iv) is determined, and identifying the layer segment corresponding to the determined data segment as the water layer; if the step b) is repeated, the data section meeting the condition still cannot be determined, and a water layer does not exist in the target well section;
3) If the step 2) can identify the water layer, determining a top interface and/or a bottom interface of the water layer section according to the water layer, and further determining an oil-water interface of the target well section;
If the water layer cannot be identified according to the step 2), the oil-gas-water interface does not exist in the target well section.
2. The method for distinguishing oil-gas-water interface by using core elements according to claim 1, wherein the method comprises the following steps:
The method for determining the top interface of the water layer section comprises the following steps: averaging the depth value of the abnormal measuring point with the minimum depth of the determined water layer and the depth value of the measuring point adjacent to the upper part of the abnormal measuring point with the minimum depth to obtain the depth value of the top interface of the water layer segment;
The method for determining the bottom interface of the water layer section comprises the following steps: and averaging the depth value of the abnormal measuring point with the maximum depth of the determined water layer and the depth value of the measuring point adjacent to the lower part of the abnormal measuring point with the maximum depth to obtain the depth value of the bottom interface of the water layer segment.
3. The method for distinguishing oil-gas-water interface by using core elements according to claim 1, wherein the method comprises the following steps: the determination method of X m is as follows:
when a non-reservoir section exists in the target well section, taking the average value of the target element content of the non-reservoir section as the value of X m;
When the target well section does not have a non-reservoir section, if the gas layer section exists, the average value of the target element content of the gas layer section is X m, and if the gas layer section does not exist, the background value of the target element content of an adjacent well in the area where the target well section exists is used as X m; the gas layer section is interpreted from a well log.
4. The method for distinguishing oil-gas-water interface by using core elements according to claim 1, wherein the method comprises the following steps: in step 1), the data acquisition method comprises the following steps: and airing the drilling core, and then analyzing element content of the drilling core at each set distance.
5. The method for distinguishing oil-gas-water interface by using core elements according to claim 1, wherein the method comprises the following steps: the data is obtained by scanning the drill core in a core scanning analyzer.
6. A method for identifying a water layer by using a core element, which is characterized in that: the method comprises the following steps:
1) Setting measuring points of a target well section drilling core at different depths, acquiring content data of a target element at each depth measuring point, and screening out measuring points meeting X/X m to be more than or equal to k from all measuring points as abnormal measuring points; wherein X is the content of the target element of the screening measuring point, X m is the background value of the content of the target element of the target well section, and k is the abnormality judgment multiple; the target element is sodium element or chlorine element; the interval between any two adjacent measuring points in the target well section is 7-20 cm;
2) Identifying the aqueous layer by a method comprising the steps of:
a) Taking the first abnormal measuring point from shallow to deep of the drilling core as the initial measuring point of the data segment, and determining the data segment meeting the conditions i) to iv) simultaneously:
i) The measuring point with the largest depth in the data segment is an abnormal measuring point;
ii) all abnormal measurement points in the data segment are continuous, the number of the abnormal measurement points is more than or equal to 3, or discontinuous abnormal measurement points exist in the data segment, the number of the total measurement points of the data segment is more than or equal to 5, and the number of the non-abnormal measurement points between any two adjacent abnormal measurement points is less than 3;
iii) The number of the abnormal measuring points in the data segment accounts for more than 50% of the total number of the measuring points in the data segment;
iv) the data segment contains the most abnormal measuring points;
if the data section meeting the conditions i) to iv) simultaneously is determined, identifying the layer section corresponding to the data section as the water layer of the target well section; if the data segment meeting the conditions i) to iv) simultaneously cannot be determined, performing the following step b);
b) Determining the data segment meeting the conditions i) to iv) simultaneously by using the lower adjacent abnormal measuring point of the initial measuring point when determining the data segment for the previous time as the initial measuring point of the data segment;
c) If the step b) determines that the data segments of the conditions i) to iv) are simultaneously met, identifying the layer segment corresponding to the determined data segment as the water layer of the target well segment, and if the data segment meeting the conditions still cannot be determined, repeating the step b) until the data segment simultaneously meeting the conditions i) to iv) is determined, and identifying the layer segment corresponding to the determined data segment as the water layer; if the step b) is repeated, the data section meeting the condition still cannot be determined, and a water layer does not exist in the target well section;
3) If the step 2) can identify the water layer, determining a top interface and/or a bottom interface of the water layer section according to the water layer, and further determining an oil-water interface of the target well section;
If the water layer cannot be identified according to the step 2), the oil-gas-water interface does not exist in the target well section.
7. The method for identifying a water layer using core elements as recited in claim 6, wherein: the determination method of X m is as follows:
when a non-reservoir section exists in the target well section, taking the average value of the target element content of the non-reservoir section as the value of X m;
When the target well section does not have a non-reservoir section, if the gas layer section exists, the average value of the target element content of the gas layer section is X m, and if the gas layer section does not exist, the background value of the target element content of an adjacent well in the area where the target well section exists is used as X m; the gas layer section is interpreted from a well log.
8. The method for identifying a water layer using core elements as recited in claim 6, wherein: in step 1), the data acquisition method comprises the following steps: and airing the drilling core, and then analyzing element content of the drilling core at each set distance.
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