CN112160741A - Method for distinguishing oil-gas-water interface by using core element and method for identifying water layer - Google Patents
Method for distinguishing oil-gas-water interface by using core element and method for identifying water layer Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 157
- 238000000034 method Methods 0.000 title claims abstract description 75
- 230000002159 abnormal effect Effects 0.000 claims abstract description 108
- 238000005553 drilling Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims description 46
- 239000011734 sodium Substances 0.000 claims description 27
- 239000000460 chlorine Substances 0.000 claims description 26
- 238000004458 analytical method Methods 0.000 claims description 14
- 238000012935 Averaging Methods 0.000 claims description 12
- 229910052801 chlorine Inorganic materials 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 12
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 9
- 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 9
- 238000012216 screening Methods 0.000 claims description 8
- 238000011161 development Methods 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract 1
- 239000011435 rock Substances 0.000 description 12
- 238000005070 sampling Methods 0.000 description 11
- 239000004215 Carbon black (E152) Substances 0.000 description 9
- 229930195733 hydrocarbon Natural products 0.000 description 9
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 235000020681 well water Nutrition 0.000 description 8
- 239000002349 well water Substances 0.000 description 8
- 239000008398 formation water Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 2
- 238000013461 design 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
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- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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Abstract
The invention relates to a method for distinguishing an oil-gas-water interface by using a core element and a method for identifying a water layer, belonging to the technical field of petroleum exploration and development. The method for distinguishing the oil-gas-water interface by using the core element comprises the following steps of: 1) acquiring content data of target elements in the drilling core of the target well section at each depth measuring point, and determining an abnormal measuring point of the target well section; 2) identifying the water layer by using the determined abnormal measuring points; 3) if the water layer can be identified in the step 2), 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; and if the water interval cannot be identified according to the step 2), the target well interval has no oil-gas-water interface. The method for distinguishing the oil-gas-water interface by using the core elements is simple, and can quickly, nondestructively and accurately identify the oil-gas-water interface on a logging site.
Description
Technical Field
The invention relates to a method for distinguishing an oil-gas-water interface by using a core element and a method for identifying a water layer, belonging to the technical field of oil-gas exploration and development.
Background
The oil-gas-water interface recognition is a very important work in the early stage of oil-gas reservoir development, is the basis of research on reservoir formation characteristics and reserve parameters of an oil-gas reservoir, and accurately defines the effects of the oil-gas-water interface relation on subsequent work such as reservoir evaluation, oil-gas reserve calculation, well arrangement scheme design and perforation scheme design.
At present, there are many methods for determining oil-gas-water interfaces in oil exploration and development, and the methods are commonly used by geochemistry and well logging interpretation. The oil-water interface can be determined to a certain extent through the change of parameters such as oil concentration, oil saturation and the like by adopting a geochemical method such as quantitative fluorescence and nuclear magnetic resonance, but when a light oil reservoir is encountered, the oil reservoir identification error is larger and the oil-gas-water interface cannot be determined due to the fact that the fluorescence characteristic is not obvious. The oil-water interface is determined to a certain extent by using the change characteristics of curves of logging information such as resistivity, neutrons and the like, but the difference between the water layer of a low-pore-permeability and low-resistivity oil-gas reservoir and the oil-gas layer on the curves of resistivity and neutrons is small, so that the oil-gas water layer identification capability of the oil-gas reservoir by using the logging information is poor. When the geochemistry method and the well logging interpretation method are used for determining the oil-gas-water interface, the characteristics of an 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 elements.
In order to achieve the purpose, the method for distinguishing the oil-gas-water interface by using the core elements adopts the technical scheme that:
a method for distinguishing an oil-gas-water interface by using a core element comprises the following steps:
1) setting measuring points of the drilling core of the target well section at different depths, acquiring content data of target elements at the measuring points at different depths, and screening out the measuring points satisfying X/XmTaking the measurement point of more than or equal to k as an abnormal measurement point; wherein X is the content of target elements of the screening measuring points, and XmThe background value of the content of the target element of the target well section is obtained, and k is an abnormal judgment multiple; the target element is sodium element or chlorine element;
2) identifying the water layer using a method comprising the steps of:
a) determining a data section which simultaneously meets the conditions i) to iv) by taking a first abnormal measuring point of the well core from shallow to deep as an initial measuring point of the data section:
i) the measuring point with the maximum depth in the data segment is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous, the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points, the total number of the measuring points in the data section is more than or equal to 5, and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data segment to the total number of the measuring points in the data segment is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
if the data section meeting the conditions i) -iv) at the same time is determined, identifying the interval corresponding to the data section as a water layer of the target well section; if the data segment satisfying the conditions i) to iv) at the same time cannot be determined, performing the following step b);
b) the adjacent abnormal measuring point at the lower part of the initial measuring point when the data segment is determined for the previous time is the initial measuring point of the data segment, and the data segment which simultaneously meets the conditions i) -iv) is determined;
c) if the data section meeting the conditions i) to iv) at the same time is determined in the step b), identifying the interval corresponding to the determined data section as the water layer of the target well section, if the data section meeting the conditions cannot be determined yet, repeating the step b) until the data section meeting the conditions i) to iv) at the same time is determined, and identifying the interval corresponding to the determined data section as the water layer; if the data section meeting the conditions can not be determined by repeating the step b), a water layer does not exist in the target well section;
3) if the water layer can be identified in the step 2), 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; and if the water outlet layer cannot be identified according to the step 2), the target well section does not have an oil-gas-water interface.
The water contained in the oil and gas reservoir is generally high-salinity stratum water and contains high-concentration Na+、Mg2+、K+、Ca2 +、Cl-、SO3 2-、HCO3 -、CO3 2-Plasma of Na in it+、Cl-Both ions are widely present and highest in formation water and lower in hydrocarbon-bearing cores. Meanwhile, the greatest difference between core drilling and ordinary drill bit drilling is that rock is not broken by the drill bit in the drilling process, the pore of the core is not damaged basically, and the core can completely store the pore and formation water in the pore. The salt content of the hydrocarbon-containing core is clearly different from that of the aqueous core remaining in the pores. The method for distinguishing the oil-gas-water interface by using the core element utilizes the characteristics of formation water and a well drilling core obtained by coring drilling to compare the content of sodium or chlorine element in the formation water at different depths of the core and convert the sodium or chlorine element into sodium or chlorine elementThe depth position of the element content mutation is used as a gas-water interface or an oil-water interface, the method is simple, and the oil-gas-water interface can be rapidly, nondestructively and accurately identified on a logging site.
It can 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 is 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 section is determined for the previous time is the second abnormal measuring point from shallow to deep, and the adjacent abnormal measuring point below the initial measuring point when the data section 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 section comprises the following steps: and averaging the determined depth value of the abnormal measuring point with the minimum depth of the water layer and the depth value of the adjacent measuring point at 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 section. The method for determining the bottom interface of the water layer comprises the following steps: and averaging the determined depth value of the abnormal measuring point with the maximum depth of the water layer and the depth value of the adjacent measuring point at 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 section.
If the top interface depth of the water layer interval is recorded as H1It can be understood that H1The determined abnormal measuring point with the minimum water layer depth and the corresponding depth average value of the measuring points adjacent to the upper part of the abnormal measuring point are obtained. If the corresponding depth of the abnormal measuring point with the minimum water layer depth is H11The depth corresponding to the upper adjacent non-abnormal number measuring point is H10. Then define the top depth H of the water section1＝H10*0.5+H110.5, i.e. the depth H of the top of the water layer segment1Is H10And H11Thus ensuring that the error accuracy is half of the measurement interval. Similarly, if the depth of the bottom interface of the water layer interval is recorded as H2Then it can be understood that H2The average value of the depths corresponding to the determined common measuring point with the maximum water layer section depth and the adjacent measuring point below the common measuring point is obtained.If the determined corresponding depth of the maximum depth measuring point of the water layer is H20The corresponding depth of the lower adjacent normal measuring point is H21Then H2＝H20*0.5+H21*0.5。
Further, the method for determining Xm is as follows:
when the target well section has a non-reservoir 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 a gas interval exists, the average value of the content of the target element of the gas interval is Xm, and if the gas interval does not exist, the background value of the content of the target element of the adjacent well in the region where the target well section is located is used as Xm; the gas interval is interpreted by logging. The adjacent well refers to an oil and gas well which is close to the target well section in the area where the target well section is located and has target element content data of a non-reservoir section or a gas reservoir section, preferably an oil and gas well which is closest to the target well section and has target element content data of a non-reservoir section or a gas reservoir section, and the background value of the content of the target element of the adjacent well is the average value of the content of the target element of the reservoir section or the gas reservoir section of the adjacent well.
For example, the gas interval may be determined by gas logging while drilling all hydrocarbon determination or well logging. Because the mudstone generally belongs to a non-reservoir section, the core of the drilling core can be counted, and the average content of the target elements in the mudstone is taken as the value of Xm.
Furthermore, in order to improve the accuracy of distinguishing 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 obtaining method includes the following steps: and airing the drilling core, and then carrying out element content analysis on the drilling core at a set distance. The airing mode is preferably natural airing. After the core is dried, the water in the core is evaporated, but the salt mineral in the core is crystallized and left in the pores and cannot be lost.
Further, the data is obtained by scanning the well core in a core scanning analyzer. Through the mode of core element scanning, the content of the analysis element at different depth positions of the core is analyzed at small intervals (the measurement precision is about 0.1 m), the oil-gas-water interface can be rapidly, nondestructively and accurately identified on a logging site, and the method has wide application prospects in the logging field. Normally, the core is put into the instrument in its entirety, and the core sample is subjected to element analysis at small intervals, the analyzed element types are 17 elements of 'Na, Mg, Al, Si, P, S, Cl, K, Ca, Ba, Ti, Mn, Fe, V, Ni, Sr and Zr', the types cover 6 important elements of 'Na, Mg, S, Cl, K and Ca' contained in the formation water, and the content of the 6 elements can be checked through core element analysis. Besides carrying out nondestructive analysis by adopting a core scanning analyzer, the method can also carry out sampling analysis on the element content of the drilling core at different depths.
The method for identifying the water layer by using the core elements adopts the technical scheme that:
a method for identifying a water layer by using core elements comprises the following steps:
1) setting measuring points of the drilling core of the target well section at different depths, acquiring content data of target elements at the measuring points at different depths, and screening out the measuring points satisfying X/XmTaking the measurement point of more than or equal to k as an abnormal measurement point; wherein X is the content of target elements of the screening measuring points, and XmThe background value of the content of the target element of the target well section is obtained, and k is an abnormal judgment multiple; the target element is sodium element or chlorine element;
2) identifying the water layer using a method comprising the steps of:
a) determining a data section which simultaneously meets the conditions i) to iv) by taking a first abnormal measuring point of the well core from shallow to deep as an initial measuring point of the data section:
i) the measuring point with the maximum depth in the data segment is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous, the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points, the total number of the measuring points in the data section is more than or equal to 5, and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data segment to the total number of the measuring points in the data segment is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
if the data section meeting the conditions i) -iv) at the same time is determined, identifying the interval corresponding to the data section as a water layer of the target well section; if the data segment satisfying the conditions i) to iv) at the same time cannot be determined, performing the following step b);
b) the adjacent abnormal measuring point at the lower part of the initial measuring point when the data segment is determined for the previous time is the initial measuring point of the data segment, and the data segment which simultaneously meets the conditions i) -iv) is determined;
c) if the data section meeting the conditions i) to iv) at the same time is determined in the step b), identifying the interval corresponding to the data section determined in the step b) as a water layer of the target well section, if the data section meeting the conditions cannot be determined, repeating the step b) until the data section meeting the conditions i) to iv) at the same time is determined, and identifying the interval corresponding to the determined data section as the water layer; if the data section meeting the condition can not be determined by repeating the step b), the target well section does not have a water layer.
The method for identifying the water layer by using the core element utilizes the characteristics of formation water and a well drilling core obtained by coring drilling, compares the contents of sodium and/or chlorine elements in the formation water at different depths of the core, and takes the depth position with the content of the sodium and/or chlorine elements suddenly changed as a gas-water interface or an oil-water interface.
Further, the method for determining Xm is as follows:
when the target well section has a non-reservoir 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 a gas interval exists, the average value of the content of the target element of the gas interval is Xm, and if the gas interval does not exist, the background value of the content of the target element of the adjacent well in the region where the target well section is located is used as Xm; the gas interval is interpreted by logging.
Furthermore, the interval between any two adjacent measuring points in the target well section is 5-30 cm.
Further, in step 1), the data obtaining method includes the following steps: and airing the drilling core, and then carrying out element content analysis on the drilling core at a set distance.
Further, the data is obtained by scanning the well 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 abnormity judgment multiple k can be determined by adopting an adjacent well comparison method: selecting an oil-gas well which is a known water layer in a target area and is closest to a target well section as a neighboring well for comparison, calculating the ratio of the target element content of each sampling point in the water layer of the neighboring well for comparison to the average value of the target element content in the non-reservoir or gas layer of the neighboring well for comparison, and taking the minimum ratio obtained by calculation as the value of k.
Drawings
FIG. 1 is a core element log of a J1 well target interval in an example of the invention;
FIG. 2 is a representation of a J1 well aquifer feature in an embodiment of the invention;
FIG. 3 is a core element log of a J2 well target interval in an example of the invention.
Detailed Description
The present invention will be further described below 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 elements 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 of:
1) drilling and coring a target well section, naturally airing the obtained rock core, setting measuring points at intervals of 5-20 cm, scanning and analyzing the rock core by using a rock core scanning analyzer to measure the element content (quality) of each measuring point of the rock core, obtaining data of Na element content changing along with depth, and counting the lithology of the rock core, wherein specific analysis and counting results are shown in table 1;
TABLE 1 analysis, statistics and calculation results
2) The target well section of the well has non-reservoir section mudstone sections 3341.281-3343.126m, the average value of Na elements of the mudstone sections is 0.325%, so the background content Xm of the Na elements of the target well section is 0.325%, 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 closest distance to the target well section in the area where the target well section is located as a comparison adjacent well, wherein the comparison adjacent well meeting the condition is an L1 well; given that there are 12 sampling points in the L1 well water layer, 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% and 3.225%, the average value (i.e. background value) of the mass percentage of Na element in the L1 well non-reservoir layer is 0.421%, the ratio of Na element to background value in each sampling point of the L1 well water layer is 6.39, 7.72, 5.52, 5.99, 10.29, 9.47, 5.03, 6.85, 7.66, 8.78, 9.49 and 7.66, wherein the minimum value of the ratio is 5.03, and the value is determined as k, that is k equal to 5.03.
Accordingly, the measuring points with the multiple of more than or equal to 5.03 are screened out, specifically the measuring points with the serial numbers of 9-14, 22 and 24, and the 8 measuring points are abnormal measuring points of the target well section;
3) the water layer is then identified using a method comprising the steps of: and (3) taking the first abnormal measuring point (number 9) of the drill core from shallow to deep as the initial measuring point of the data section, and searching the data section which simultaneously meets the conditions i) to iv):
i) the measuring point with the maximum depth in the data section is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous and the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points and the total number of the measuring points in the data section is more than or equal to 5 and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data section to the total number of the measuring points in the data section is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
simultaneously satisfying the conditions i) -iv) is a data section between the measuring point 9 and the measuring point 14, and the interval corresponding to the data section is identified as the water layer of the target well section;
4) the depth value corresponding to the measurement point (the measurement point with the number of 9) with the minimum depth of the water layer identified in the step 3) is 3339.364m, and the depth value corresponding to the measurement point (the measurement point with the number of 14) with the maximum depth is 3339.942 m;
and averaging the corresponding depth values of the measuring point with the number of 9 and the measuring point with the number of 8 to obtain 3339.314m, averaging the corresponding depth values of the measuring point with the number of 14 and the measuring point with the number of 15 to obtain 3339.992m, wherein the oil-gas-water interface of the target well section is at 3339.314m and 3339.992m, the top interface depth of the water layer section is at 3339.314m, and the bottom interface depth of the water layer section is at 3339.992 m.
Example 2
The method for distinguishing the oil-gas-water interface by using the core elements 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 of:
1) according to the step 1) of the embodiment 1), when the rock core is scanned and analyzed by using a rock core scanning analyzer to measure the element content (mass) of each measuring point of the rock core, data of the Cl element content changing along with the depth are obtained at the same time, and the data are specifically shown in a table 1;
2) the target well section of the well has non-reservoir section mudstone sections 3341.281-3343.126m, the average value of Cl elements of the mudstone sections is 0.144%, so the background content Xm of the Cl elements of the target well section is 0.144%, 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 Cl element contents of 12 sampling points of the L1 well water layer selected in example 1 are 1.009%, 0.992%, 0.894%, 0.953%, 1.468%, 1.312%, 0.823%, 1.221%, 1.075%, 1.335%, 1.316%, 1.095, the average value of Cl element mass percentage (i.e., background value) of the L1 well non-reservoir layer is 0.166%, and the Cl element-to-background value ratios of the L1 well water layer are 6.08, 5.98, 5.39, 5.74, 8.84, 7.90, 4.96, 7.36, 6.48, 8.04, 7.93, and 6.60, respectively, wherein the minimum value of the ratios is 4.96, and the value is determined as k, that is 4.96.
Accordingly, measuring points with the multiple of more than or equal to 4.96, specifically measuring points with the numbers of 9-14, 24 and 31 are screened out, and the 8 measuring points are abnormal measuring points of the target well section;
3) the water layer is then identified using a method comprising the steps of: and (3) searching data sections which simultaneously meet the conditions i) to iv) by taking the first abnormal measuring point (number 9) of the drill core from shallow to deep as the initial measuring point of the data sections:
i) the measuring point with the maximum depth in the data section is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous and the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points and the total number of the measuring points in the data section is more than or equal to 5 and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data section to the total number of the measuring points in the data section is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
simultaneously satisfying the conditions i) -iv) is a data section between the measuring point 9 and the measuring point 14, and the interval corresponding to the data section is identified as the water layer of the target well section;
4) the depth value corresponding to the measurement point (the measurement point with the number of 9) with the minimum depth of the water layer identified in the step 3) is 3339.364m, and the depth value corresponding to the measurement point (the measurement point with the number of 14) with the maximum depth is 3339.942 m;
and averaging the corresponding depth values of the measuring point with the number of 9 and the measuring point with the number of 8 to obtain 3339.314m, averaging the corresponding depth values of the measuring point with the number of 14 and the measuring point with the number of 15 to obtain 3339.992m, wherein the oil-gas-water interface of the target well section is at 3339.314m and 3339.992m, the top interface depth of the water layer section is at 3339.314m, and the bottom interface depth of the water layer section is at 3339.992 m.
The oil-gas-water interface of the target interval determined in this example is identical to the oil-gas-water interface determined in example 1.
A core element log of the target interval (i.e., the 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 total hydrocarbon value compared with a typical oil-gas layer, the prior art generally adopts logging curves and related subjects of the logging curves to comprehensively judge the water layer according to the response characteristics of the water layer. For the drilled J1 well, the water layer is considered to correspond to a depth of 3339.314m-3339.992m by the variation characteristic analysis of the corresponding characteristics. As shown in figure 2, the logging resistivity of the stratum is reduced from 50.5 omega-m at the upper part to 16.8 omega-m, the gas logging total hydrocarbon value is reduced from 5.59% to 0.53%, and the logging curve and the total hydrocarbon curve verify the characteristics of a water outlet stratum, 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 elements in the embodiment takes a certain 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 for coring, naturally airing the obtained core, setting measuring points at intervals of 7-28 cm, scanning and analyzing the core by using a core scanning analyzer to measure the element content (mass) of each depth measuring point of the core, obtaining data of Na element content changing along with the depth, and counting the lithology of the core, wherein specific analysis and counting results are shown in a table 2;
TABLE 2 analysis, test and calculation results
2) Because the lithology of the coring sections is sandstone and no non-reservoir section exists, the depth of the gas layer section of the target interval is judged and identified to be 3315.861-3317.732m according to a gas measurement total hydrocarbon curve, the average content of Na elements in the gas layer section is 1.058%, the background content Xm of the Na elements of the target well section is 1.058%, 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 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 closest distance to the target well section in the area where the target well section is located as a comparison adjacent well, wherein the comparison adjacent well meeting the condition is an L2 well; as is known, there are 9 sampling points in the L2 well water layer, 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 L2 well gas layer is 0.963%, and the ratio of Na element to background value in each sampling point in the L2 well water layer is 2.41, 3.66, 3.24, 2.74, 2.42, 2.28, 2.12, 1.96, 2.73, where the minimum value of the ratio is 1.96, and the value is determined as k, i.e., k is 1.96.
Accordingly, measuring points with the multiple of more than or equal to 1.96 are screened, specifically measuring points with the serial numbers of 29-38, 41-42, 45, 47-49, 51-52, 55-56 and 59-64, and the 26 measuring points are abnormal measuring points of the target well section;
3) the water layer is then identified using a method comprising the steps of: and (3) searching a data section meeting the conditions i) to iv) by taking the first abnormal measuring point (numbered as 29) of the drill core from shallow to deep as the initial measuring point of the data section:
i) the measuring point with the maximum depth in the data section is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous and the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points and the total number of the measuring points in the data section is more than or equal to 5 and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data section to the total number of the measuring points in the data section is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
meanwhile, the data section meeting the conditions i) -iv) is a data section between the measuring point 29 and the measuring point 64, and the interval corresponding to the data section is identified as the water layer of the target well section;
4) the depth value corresponding to the measurement point (measurement point numbered 29) with the minimum depth of the water layer identified in step 3) is 3317.938m, and the depth value corresponding to the measurement point (measurement point numbered 64) with the maximum depth is 3321.848 m;
and averaging the corresponding depth values of the measuring point with the number of 29 and the measuring point with the number of 28 to obtain 3317.835m, averaging the corresponding depth values of the measuring point with the number of 64 and the measuring point with the number of 65 to obtain 3321.898m, wherein the oil-gas-water interface of the target well section is at 3317.835m and 3321.898m, the top interface depth of the water layer section is at 3317.835m, and the bottom interface depth of the water layer section is at 3321.898 m.
Example 4
The method for distinguishing the oil-gas-water interface by using the core elements 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 rock core is scanned and analyzed by using a rock core scanning analyzer to measure the element content (mass) of each depth measurement point of the rock core, data of the Cl element content changing along with the depth are obtained at the same time, and the data are specifically shown in a 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 interval is judged and identified to be 3315.861-3317.732m according to a gas logging total hydrocarbon curve, the average content of Cl element in the gas layer section is 1.966%, therefore, the background content Xm of the Cl element of the target well section is 1.966%, 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 2.
The content of Cl element in the L2 well water layer selected in example 3 at 9 sampling points is 4.935%, 6.962%, 5.338%, 6.176%, 7.673%, 6.329%, 4.029%, 3.587% and 6.356%, the average value (i.e. background value) of the Cl element mass percentage in the L2 well gas layer is 1.759%, and the ratio of the Cl element to the background value at each sampling point in the L2 well water layer is 2.81, 3.96, 3.03, 3.51, 4.36, 3.60, 2.29, 2.04 and 3.61, wherein the minimum value of the ratio is 2.04, and the value is determined as k, i.e. k is 2.04.
Accordingly, measuring points with the multiple of more than or equal to 2.04 are screened, specifically measuring points with the serial numbers of 29, 31-32, 34-36, 38, 41-42, 45, 47-48, 51-52, 55-56, 59 and 61-63, and the 20 measuring points are abnormal measuring points of the target well section;
3) the water layer is then identified using a method comprising the steps of: and (3) searching a data section meeting the conditions i) to iv) by taking the first abnormal measuring point (numbered as 29) of the drill core from shallow to deep as the initial measuring point of the data section:
i) the measuring point with the maximum depth in the data section is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous and the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points and the total number of the measuring points in the data section is more than or equal to 5 and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data section to the total number of the measuring points in the data section is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
the data section meeting the conditions i) to iv) is the data section between the measuring point 29 and the measuring point 63, and the data section is identified as the water layer of the target well section;
4) the depth value corresponding to the measurement point (measurement point numbered 29) with the minimum depth of the water layer identified in the step 3) is 3317.938m, and the depth value corresponding to the measurement point (measurement point numbered 63) with the maximum depth is 3321.748 m;
and averaging the corresponding depth values of the measuring point with the number of 29 and the measuring point with the number of 28 to obtain 3317.835m, averaging the corresponding depth values of the measuring point with the number of 63 and the measuring point with the number of 64 to obtain 3321.798m, wherein the oil-gas-water interface of the target well section is at 3317.835m and 3321.798m, the top interface depth of the water layer section is at 3317.835m, and the bottom interface depth of the water layer section is at 3321.798 m.
Using the Na and Cl content data in table 2 of example 3, a core element log of the target interval of the J2 well was obtained, as shown in fig. 3. As can be seen from FIG. 3, the method can effectively identify water intervals for wells whose logging curves are not sensitive to hydrocarbon water response.
Example of method for identifying 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) of embodiment 1, and is not described herein again.
Example 6
The method for identifying the water layer by using the core element in this embodiment is the same as the steps 1) to 3) in embodiment 2, and is not described herein again.
Example 7
The method for identifying the water layer by using the core element in this embodiment is the same as the steps 1) to 3) in embodiment 3, and is not described herein again.
Example 8
The method for identifying the water layer by using the core element in this embodiment is the same as the steps 1) to 3) in embodiment 4, and is not described herein again.
Claims (10)
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 the drilling core of the target well section at different depths, acquiring content data of target elements at the measuring points at different depths, and screening out the measuring points satisfying X/XmTaking the measurement point of more than or equal to k as an abnormal measurement point; wherein X is the content of target elements of the screening measurement pointsAmount, XmThe background value of the content of the target element of the target well section is obtained, and k is an abnormal judgment multiple; the target element is sodium element or chlorine element;
2) identifying the water layer using a method comprising the steps of:
a) determining a data section which simultaneously meets the conditions i) to iv) by taking a first abnormal measuring point of the well core from shallow to deep as an initial measuring point of the data section:
i) the measuring point with the maximum depth in the data segment is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous, the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points, the total number of the measuring points in the data section is more than or equal to 5, and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data segment to the total number of the measuring points in the data segment is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
if the data section meeting the conditions i) -iv) at the same time is determined, identifying the interval corresponding to the data section as a water layer of the target well section; if the data segment satisfying the conditions i) to iv) at the same time cannot be determined, performing the following step b);
b) the adjacent abnormal measuring point at the lower part of the initial measuring point when the data segment is determined for the previous time is the initial measuring point of the data segment, and the data segment which simultaneously meets the conditions i) -iv) is determined;
c) if the data section meeting the conditions i) to iv) at the same time is determined in the step b), identifying the interval corresponding to the determined data section as the water layer of the target well section, if the data section meeting the conditions cannot be determined yet, repeating the step b) until the data section meeting the conditions i) to iv) at the same time is determined, and identifying the interval corresponding to the determined data section as the water layer; if the data section meeting the conditions can not be determined by repeating the step b), a water layer does not exist in the target well section;
3) if the water layer can be identified in the step 2), 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;
and if the water outlet layer cannot be identified according to the step 2), the target well section does not have an oil-gas-water interface.
2. The method for distinguishing an oil-gas-water interface by using the core element as claimed in claim 1, wherein:
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 water layer and the depth value of the adjacent measuring point at 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 section;
the method for determining the bottom interface of the water layer comprises the following steps: and averaging the determined depth value of the abnormal measuring point with the maximum depth of the water layer and the depth value of the adjacent measuring point at 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 section.
3. The method for distinguishing an oil-gas-water interface by using the core element as claimed in claim 1, wherein: xm is determined as follows:
when the target well section has a non-reservoir 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 a gas interval exists, the average value of the content of the target element of the gas interval is Xm, and if the gas interval does not exist, the background value of the content of the target element of the adjacent well in the region where the target well section is located is used as Xm; the gas interval is interpreted by logging.
4. The method for distinguishing an oil-gas-water interface by using the core element as claimed in claim 1, 2 or 3, wherein: the interval between any two adjacent measuring points in the target well section is 5-30 cm.
5. The method for distinguishing an oil-gas-water interface by using the core element as claimed in claim 4, wherein: in step 1), the data acquisition method comprises the following steps: and airing the drilling core, and then carrying out element content analysis on the drilling core at a set distance.
6. The method for distinguishing an oil-gas-water interface by using the core element as claimed in claim 1, wherein: the data is obtained by scanning the well core in a core scanning analyzer.
7. A method for identifying a water layer by using core elements is characterized by comprising the following steps: the method comprises the following steps:
1) setting measuring points of the drilling core of the target well section at different depths, acquiring content data of target elements at the measuring points at different depths, and screening out the measuring points satisfying X/XmTaking the measurement point of more than or equal to k as an abnormal measurement point; wherein X is the content of target elements of the screening measuring points, and XmThe background value of the content of the target element of the target well section is obtained, and k is an abnormal judgment multiple; the target element is sodium element or chlorine element;
2) identifying the water layer using a method comprising the steps of:
a) determining a data section which simultaneously meets the conditions i) to iv) by taking a first abnormal measuring point of the well core from shallow to deep as an initial measuring point of the data section:
i) the measuring point with the maximum depth in the data segment is an abnormal measuring point;
ii) all abnormal measuring points in the data section are continuous, the number of the abnormal measuring points is more than or equal to 3, or the data section has discontinuous abnormal measuring points, the total number of the measuring points in the data section is more than or equal to 5, and the number of the non-abnormal measuring points between any two adjacent abnormal measuring points is less than 3;
iii) the proportion of the number of abnormal measuring points in the data segment to the total number of the measuring points in the data segment is more than 50 percent;
iv) the data segment contains the largest number of abnormal measurement points;
if the data section meeting the conditions i) -iv) at the same time is determined, identifying the interval corresponding to the data section as a water layer of the target well section; if the data segment satisfying the conditions i) to iv) at the same time cannot be determined, performing the following step b);
b) the adjacent abnormal measuring point at the lower part of the initial measuring point when the data segment is determined for the previous time is the initial measuring point of the data segment, and the data segment which simultaneously meets the conditions i) -iv) is determined;
c) if the data section meeting the conditions i) to iv) at the same time is determined in the step b), identifying the interval corresponding to the data section determined in the step b) as a water layer of the target well section, if the data section meeting the conditions cannot be determined, repeating the step b) until the data section meeting the conditions i) to iv) at the same time is determined, and identifying the interval corresponding to the determined data section as the water layer; if the data section meeting the condition can not be determined by repeating the step b), the target well section does not have a water layer.
8. The method for identifying a water layer using core elements as claimed in claim 7, wherein: xm is determined as follows:
when the target well section has a non-reservoir 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 a gas interval exists, the average value of the content of the target element of the gas interval is Xm, and if the gas interval does not exist, the background value of the content of the target element of the adjacent well in the region where the target well section is located is used as Xm; the gas interval is interpreted by logging.
9. The method for identifying a water layer using core elements as claimed in claim 7 or 8, wherein: the interval between any two adjacent measuring points in the target well section is 5-30 cm.
10. The method for identifying a water layer using core elements as claimed in claim 9, wherein: in step 1), the data acquisition method comprises the following steps: and airing the drilling core, and then carrying out element content analysis on the drilling core at a set distance.
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