CN115166858A - Method and device for identifying gas water in compact water-containing gas reservoir - Google Patents
Method and device for identifying gas water in compact water-containing gas reservoir Download PDFInfo
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Abstract
The method comprises the steps of obtaining a logging curve of a target reservoir gas reservoir and reservoir interpretation parameters, wherein the reservoir interpretation parameters comprise lithologic parameters, electrical parameters, physical parameters and gas-bearing parameters; dividing the target reservoir gas reservoir into at least one gas group according to the deposition environment, diagenesis conditions, lithologic parameters and physical parameters of the target reservoir gas reservoir; according to the electrical parameter, the physical property parameter and the gas content parameter, each gas group is divided once to obtain a pure gas layer area, a gas layer and gas-water layer mixing area, a pure gas-water layer area and the boundary of each area; and according to the logging curve, secondarily dividing a gas layer and gas-water layer mixed area to obtain a gas layer area and a gas-water layer area and a boundary. The method provided by the invention can obtain the accurate limit of different fluid property intervals of the reservoir gas reservoir, is beneficial to improving the calculation reliability of the natural gas reserves, reasonably carrying out exploration, development and deployment, reducing the gas testing cost and improving the development economy.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to a gas-water identification method and a gas-water identification device for a dense water-containing gas reservoir.
Background
The exploration and development of the compact water-bearing gas reservoir have poor physical properties of the reservoir, and the non-average value in the layer and between the layers is strong; the hydrocarbon source rock does not develop, the resource amount is limited, partial gas reservoir is unsaturated in the natural gas filling process, and the defect of uniform gas-water interface is overcome, so that the influence of the rock skeleton in most reservoirs on the resistivity is far higher than the influence of fluid on the resistivity. The response characteristics of the acoustic time difference, the density and the compensation neutron curve are skeleton information and are not sensitive to the fluid, so that the phenomena of simultaneous discharge of high-resistance gas and water and low-resistance production of pure gas are common, and the gas and water identification difficulty is high.
In recent years, with the continuous and deep identification and research of reservoir fluids, experimental methods and means are continuously enriched and perfected, and a plurality of research results are obtained. However, in view of the current research situation at home and abroad, a method system capable of systematically and comprehensively solving the gas-water identification problem in the water-bearing gas reservoir with a complex gas-water relationship is still lacked, and the research on gas-water identification and evaluation technology in the compact water-bearing gas reservoir is still in the exploration stage.
In view of the above, the present disclosure aims to provide a method and an apparatus for identifying gas and water in a tight water-bearing gas reservoir.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a method and a device for identifying gas and water in a dense water-bearing gas reservoir, so as to solve the problem of accuracy in identifying gas and water in the water-bearing gas reservoir in the prior art, and provide a reliable support basis for gas field exploration and development.
In order to solve the technical problems, the specific technical scheme is as follows:
in a first aspect, provided herein is a tight moisture reservoir gas-water identification method, comprising:
acquiring a logging curve and reservoir interpretation parameters of a target reservoir gas reservoir, wherein the reservoir interpretation parameters comprise lithologic parameters, electrical parameters, physical parameters and gas-bearing parameters;
dividing the target reservoir gas reservoir into at least one gas group according to the deposition environment, diagenesis conditions, lithologic parameters and physical parameters of the target reservoir gas reservoir;
according to the electrical parameter, the physical property parameter and the gas-containing property parameter, each gas group is divided once to obtain a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area and the boundary of each area;
and carrying out secondary division on the gas layer and gas-water layer mixed area according to the logging curve to obtain a gas layer area and a gas-water layer area and a boundary.
Preferably, the lithological parameters include at least shale content, the electrical parameters include at least electrical resistivity, the physical parameters include at least porosity, and the gas bearing parameters include at least water saturation.
Further, according to the electrical parameter, the physical parameter and the gas content parameter, each gas group is divided once to obtain a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area and the boundary of each area, and the method comprises the following steps:
drawing a first intersection graph according to the resistivity, the porosity and the water saturation of each gas group test gas sampling point;
and dividing the pure gas layer area, the gas layer and gas-water layer mixed area, the pure gas-water layer area and the boundary of each area according to the first intersection map.
Preferably, before obtaining the pure gas layer region, the gas layer and water layer mixed region, the pure gas and water layer region and the boundaries of the regions by performing primary division on each gas group according to the electrical parameter, the physical parameter and the gas content parameter, the method further includes:
drawing a second intersection graph according to the resistivity and the argillaceous content of each gas group test gas sampling point;
determining lithology boundaries of each gas group according to the second intersection graph;
and when the lithology limit is less than or equal to the preset value, judging that the gas group has development value and executing a primary dividing step of the gas group.
In particular, the well log of the target reservoir gas reservoir includes a deep lateral resistivity curve and a shallow lateral resistivity curve.
Further, according to the logging curve, performing secondary division on the gas layer and gas-water layer mixed area to obtain a gas layer area and a gas-water layer area and a boundary, and the method comprises the following steps:
calculating the difference value between the deep lateral resistivity and the shallow lateral resistivity of each test gas sampling point in the gas layer and gas-water layer mixed region;
drawing a third cross plot of the difference and resistivity;
and according to the third intersection drawing, secondarily dividing the gas layer and gas-water layer mixing area.
Further, according to the third intersection map, performing secondary division on the gas layer and gas-water layer mixing area, including:
determining a difference threshold for dividing the gas-water zone and the same gas-water zone according to the third intersection map;
when the difference value of the gas testing sampling points is smaller than the difference value threshold value, determining that the gas testing sampling points correspond to the same gas-water zone;
and when the difference value of the gas testing sampling points is greater than or equal to the difference value threshold value, determining that the gas testing sampling points correspond to the gas layer regions.
In a second aspect, this document also provides a tight water-bearing gas reservoir gas-water identification device comprising:
the acquisition module is used for acquiring a logging curve of a target reservoir gas reservoir and reservoir interpretation parameters, wherein the reservoir interpretation parameters comprise lithologic parameters, electrical parameters, physical parameters and gas-bearing parameters;
the gas group dividing module is used for dividing the target reservoir gas reservoir into at least one gas group according to the deposition environment, the diagenesis condition, the lithology parameter and the physical property parameter of the target reservoir gas reservoir;
the primary division module is used for carrying out primary division on each gas group according to the electrical parameters, the physical property parameters and the gas containing property parameters to obtain a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area and the boundary of each area;
and the secondary division module is used for carrying out secondary division on the gas layer and gas-water layer mixed area according to the logging curve to obtain a gas layer area and a gas-water layer area and a boundary.
In a third aspect, this document also provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement the method provided in the above technical solution.
In a fourth aspect, this document also provides a computer-readable storage medium, which stores a computer program, and when executed by a processor, the computer program implements the method provided by the above technical solution.
By adopting the technical scheme, the gas-water identification method and the device for the compact water-containing gas reservoir provided by the invention have the advantages that each gas group is divided by the influence gas group factors such as reservoir deposition environment, diagenesis conditions and the like; further dividing a pure gas layer region, a gas layer and gas-water layer mixed region and a pure gas-water layer region through the quadric parameters of the reservoir; finally, secondarily dividing a gas layer area and a gas-water same-layer area in a gas layer and gas-water same-layer mixed area according to a logging curve, and finally obtaining accurate limits of different fluid property intervals of a reservoir gas reservoir, so that the method is favorable for improving the calculation reliability of natural gas reserves, reasonably carrying out exploration, development and deployment, reducing the gas testing cost and improving the development economy; the method is simple, the research cost is low, and the method can be used for dividing the gas-water layer of any water-containing gas reservoir.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art, the drawings used in the embodiments or technical solutions in the prior art are briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram illustrating steps of a gas-water identification method for a tight water-bearing gas reservoir provided in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating the steps of dividing each gas group once in the embodiment;
FIG. 3 shows a first cross-plot for gas group A;
FIG. 4 shows a first cross-plot for the B gas panel;
FIG. 5 is a schematic diagram illustrating the steps for determining whether a gas battery has development value in the embodiments herein;
FIG. 6 shows a second cross-plot for gas group A;
FIG. 7 shows a second cross-plot for gas group B;
FIG. 8 is a schematic diagram illustrating the steps of sub-dividing the gas layer and gas-water layer mixing zone in the embodiment herein;
FIG. 9 shows a schematic log of a tight reservoir for a section of a well where the fluid properties are gas formations;
FIG. 10 shows a schematic log of a tight reservoir at a well interval with gas-water layered fluid properties;
FIG. 11 shows a third cross-sectional view of the gas layer and the gas-water layer mixing zone in gas group A;
FIG. 12 shows a third cross-sectional view of the gas layer and the gas-water layer mixing zone in the B gas group;
FIG. 13 shows a schematic structural diagram of a gas-water identification device for a tight water-bearing gas reservoir provided in an embodiment of the present disclosure;
fig. 14 shows a schematic structural diagram of a computer device provided in an embodiment herein.
Description of the symbols of the drawings:
1310. an acquisition module;
1320. a gas group division module;
1330. a primary dividing module;
1340. a secondary division module;
1402. a computer device;
1404. a processor;
1406. a memory;
1408. a drive mechanism;
1410. an input/output module;
1412. an input device;
1414. an output device;
1416. a presentation device;
1418. a graphical user interface;
1420. a network interface;
1422. a communication link;
1424. a communication bus.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments herein without making any creative effort, shall fall within the scope of protection.
It should be noted that the terms "first," "second," and the like in the description and claims herein and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments herein described are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
In the prior art, a method capable of systematically and comprehensively solving the problem of gas and water identification in a water-containing gas reservoir with a complex gas-water relationship is still lacked, so that the research on gas-water identification and evaluation technology is still in an exploration stage in a compact water-containing gas reservoir. In order to solve the above problems, embodiments herein provide a method and apparatus for identifying gas and water in a tight water-bearing gas reservoir. FIG. 1 is a schematic diagram of the steps of a method for identifying gas and water in a tight water-bearing gas reservoir, provided in the examples herein, and the description provides the method steps as described in the examples or in the flow charts, but may include more or fewer steps based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual system or apparatus product executes, it can execute sequentially or in parallel according to the method shown in the embodiment or the figures. Specifically, as shown in fig. 1, the method may include:
s110: and acquiring a logging curve and reservoir interpretation parameters of the target reservoir gas reservoir, wherein the reservoir interpretation parameters comprise lithologic parameters, electrical parameters, physical parameters and gas-bearing parameters.
In an embodiment of the present description, the lithology parameters include at least a argillaceous content (Vsh); the electrical parameter at least comprises resistivity, and particularly can be deep lateral resistivity (Rt); the physical property parameter includes at least Porosity (POR); and the gas content parameter at least comprises water saturation (Sw), and the range of the water saturation value range can reversely reflect the gas content of the reservoir. The embodiment of the specification can be used for determining a gas reservoir with industrial exploitation value by acquiring lithological parameters, electrical parameters, physical parameters and gas-bearing parameters of a target reservoir gas reservoir, so that the requirements of industrial standards are met; and the production and implementation are convenient, and the operability is strong.
S120: and dividing the target reservoir gas reservoir into at least one gas group according to the deposition environment, diagenesis conditions, lithology parameters and physical parameters of the target reservoir gas reservoir.
The gas layer boundaries of different stratum gas groups are different under the influence of factors such as deposition environment, diagenesis conditions, lithological parameters, physical parameters, natural gas migration distance and the like; if the gas groups with different boundaries are uniformly divided into a pure gas layer area, a gas-water same-layer area and the like, the gas layer division is inaccurate, and the gas layer mining economy is reduced.
Illustratively, in the embodiments of the present description, a target reservoir gas reservoir is divided into a gas group a and a gas group B. It should be noted that the number of gas groups to be partitioned is related to the actual condition of the target reservoir gas reservoir.
S130: and according to the electrical parameter, the physical property parameter and the gas containing property parameter, carrying out primary division on each gas group to obtain a pure gas layer region, a gas layer and gas-water layer mixed region, a pure gas-water layer region and the boundary of each region.
In the examples of the specification, the pure gas layer area means that the area is only an industrial gas layer; the pure gas-water homomorphic zone means that the zone only has an industrial gas-water homomorphic layer; the gas layer and water layer mixing area means that the industrial gas layer and the industrial water layer are mixed together in the area. The pure gas zone is the best industrial production zone, namely the pure gas zone has the highest mining value; the exploitation value of the gas-water layer is inferior to that of the pure gas layer. In addition, the reservoir environment can also comprise a poor gas layer and a water layer, wherein the poor gas layer is a layer of which the gas production rate does not reach the industrial exploitation value, and the water layer indicates that the water environment is in the region. The method for identifying the gas water in the dense water-bearing gas reservoir provided by the embodiment of the specification aims to clearly divide a pure gas layer area, a pure gas water same layer area, a gas difference layer and the like.
S140: and carrying out secondary division on the gas layer and gas-water layer mixed area according to the logging curve to obtain a gas layer area, a gas-water layer area and a boundary.
That is, in step S140, the gas layer region and the gas-water co-layer region mixed in the gas layer and gas-water co-layer mixed region obtained in step S130 are further divided. Finally, the gas layer and the gas-water layer of each gas group are divided and identified, so that the natural gas reserves are calculated, exploration, development and deployment planning are facilitated, the gas testing cost is reduced, and the mining economic efficiency is improved.
According to the method for identifying the gas water in the tight water-bearing gas reservoir, each gas group is divided by influencing gas group factors such as reservoir deposition environment, diagenesis conditions and the like; and then, a gas group is divided for the first time and a gas layer and gas-water layer mixed region obtained by the first division is divided for the second time through the reservoir bed four-property (lithology, electrical property, physical property and gas-bearing property) parameters and the logging curve, so that a low-resistance gas layer and a high-resistance water layer are distinguished from each other, and a gas layer region and a water layer region in the mixed region can be divided, the logging interpretation coincidence rate is greatly improved, the method has a good application effect in logging the gas reservoir with a complex gas-water relationship, powerful support can be provided for efficient development of a compact gas reservoir, and an important theoretical basis is provided for comprehensive adjustment and development planning of the gas field.
Specifically, as shown in fig. 2, step S130: according to the electrical parameter, the physical property parameter and the gas-containing property parameter, each gas group is divided once to obtain a pure gas layer region, a gas layer and gas-water layer mixed region, a pure gas-water layer region and the boundary of each region, and the method further comprises the following steps:
s210: and drawing a first intersection graph according to the resistivity, the porosity and the water saturation of each gas group test gas sampling point.
In the embodiment of the specification, through analyzing each sample point of the test gas, it can be known whether the reservoir fluid property corresponding to the sample point of the test gas is a gas layer, a gas-water layer or a poor gas layer and a water layer, and the quadriversal parameters of the sample points of the test gas with known reservoir fluid properties are subsequently utilized to provide a basis for one-time division.
S220: and dividing the pure gas layer area, the gas layer and gas-water layer mixed area, the pure gas-water layer area and the boundary of each area according to the first intersection map.
As shown in fig. 3 and 4, a first cross-plot of the group a and a first cross-plot of the group B are plotted, respectively. It can be seen that, in the first cross plots corresponding to different gas groups, the differences of the parameters of the sampling points of the test gas are large. In the figure, the abscissa is porosity; the ordinate is the deep lateral resistivity; the slope of the slope represents the different water saturations. As can be seen from fig. 3 and 4, a part of the reservoir fluid is formed by agglomeration of gas sampling points of a gas layer, and the part of the gas sampling points correspond to a pure gas layer region; the property of part of reservoir fluid is that the sample points of gas and water in the same layer are agglomerated, and the sample points of the part of sample gas correspond to the same layer of pure gas and water; and a part of reservoir fluid is a gas layer test gas sampling point and a part of reservoir fluid is a gas-water layer test gas sampling point which are mixed and distributed, and the part of test gas sampling point is a gas layer and gas-water layer mixing area correspondingly.
Therefore, according to the first cross map, the following can be obtained by dividing: in the group A, the boundary of the pure gas layer region is as follows: POR is more than or equal to 7 percent, rt is more than 50 omega.m and Sw is less than or equal to 50 percent; the boundary of the pure gas-water homogeneous zone is as follows: POR is more than or equal to 7 percent, rt is more than or equal to 11 omega.m, 60 percent is more than or equal to Sw is more than 55 percent, or POR is more than 14 percent, rt is more than or equal to 9 omega.m and less than or equal to 11 omega.m, and Sw is less than or equal to 60 percent; and the boundary of the gas layer and gas-water layer mixing area is as follows: POR is more than or equal to 7 percent, rt is more than or equal to 11 omega m and less than or equal to 50 omega m, and Sw is less than or equal to 55 percent.
In group B, the pure gas layer region has the following boundaries: POR is more than or equal to 6 percent, rt is more than 60 omega.m, and Sw is less than or equal to 50 percent; the boundary of the pure gas-water homogeneous zone is as follows: POR is more than or equal to 6 percent, rt is more than or equal to 16 omega.m, 60 percent is more than or equal to Sw and more than 55 percent; and the boundary of the gas layer and gas-water layer mixing area is as follows: POR is more than or equal to 6 percent, rt is more than or equal to 16 omega m and less than or equal to 60 omega m, and Sw is less than or equal to 55 percent.
If the gas testing sampling point of the pure gas layer area and the gas testing sampling point of the pure gas-water same-layer area are regarded as completely separated sampling points, and the mixed area of the pure gas layer and the pure gas-water same-layer area is regarded as half of the coincidence, the well logging interpretation coincidence rate of the gas group A is 40%, the well logging interpretation coincidence rate of the gas group B is only 35%, and the well logging interpretation coincidence rate cannot meet the development requirement. By dividing the gas group once, whether the gas group is A or B, the logging interpretation coincidence rate (i.e. the separation degree of the gas layer, the gas-water layer and the gas-water layer) is not high due to the existence of a gas layer and gas-water layer mixed area, namely, a part of the gas layer and the gas-water layer can not be separated.
As shown in fig. 5, preferably, in step S130: according to the electrical parameter, the physical property parameter and the gas-containing property parameter, each gas group is divided once to obtain a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area and the boundary of each area, and the method further comprises the following steps:
s510: and drawing a second intersection graph according to the resistivity and the argillaceous content of each gas group test gas sampling point.
As shown in fig. 6 and 7, the second cross-sectional view of group a and the second cross-sectional view of group B are shown, respectively. In the figure, the abscissa represents the resistivity, and the ordinate represents the shale content.
S520: and determining the lithology boundary of each gas group according to the second intersection graph.
As shown in fig. 6, in the gas group a, the maximum value of the shale content in each sample gas sampling point of the gas layer and each sample gas sampling point of the gas-water layer is 16%, that is, the lithology limit of the gas group a is Vsh ≤ 16%. Similarly, in each test gas sampling point of the gas layer of the gas group B and each test gas sampling point of the gas-water layer, the maximum value of the shale content is 14 percent, namely the lithology limit of the gas group B is that Vsh is less than or equal to 14 percent.
S530: and when the lithology boundary is less than or equal to a preset value, judging that the gas group has development value and executing a primary division step of the gas group.
Namely, when the lithological boundary of the gas group is larger than the preset value, the gas group is judged to have no development value, and subsequent steps of primary division, secondary division and the like of the gas group are not needed. It should be noted that, for different gas groups, the preset values of the lithological boundaries are different, and in the embodiment of the present specification, the lithological boundary Vsh of the gas group a is less than or equal to 16% and the lithological boundary Vsh of the gas group B is less than or equal to 14% are both exemplary.
How to avoid water is a key link of natural gas development, and if gas layer and gas-water layer are mixed and developed, the recovery rate and the economic benefit can be greatly reduced. In view of this, in this embodiment of the present disclosure, the logging curves of the target reservoir gas reservoir include a deep lateral resistivity curve (RLLD) and a shallow lateral resistivity curve (RLLS), and as shown in fig. 8, performing secondary division on the gas layer and gas-water layer mixed zone according to the logging curves to obtain a gas layer zone and a gas-water layer zone and a boundary, may include the following steps:
s810: and calculating the difference value between the deep lateral resistivity and the shallow lateral resistivity of each test gas sampling point in the gas layer and gas-water same layer mixed area.
The embodiment of the specification creatively discovers that the gas layer and the water layer are mixed, the gas layer and the water layer are in the same layer, and the gas layer and the water layer are in the same layer: under the background of low natural gamma GR, the main differences between the gas layer and the gas-water layer include: the shallow and deep resistivity of the gas layer is essentially drag-reducing intrusion, i.e., RLLD > RLLS, as shown in the sixth trace of FIG. 9; the depth resistivity of the gas-water layer is basically in the increased resistance invasion, i.e. RLLD < RLLS, as shown in the sixth trace in FIG. 10.
Therefore, in the examples of the present specification, the variation of the depth-depth resistivity invasion characteristic micro-difference at the time of well log interpretation is quantitatively expressed as Δ Rt, Δ Rt = RLLD-RLLS. And using the delta Rt as a basis for secondarily dividing the gas layer and gas-water layer mixing zone.
S820: a third cross plot of the difference versus resistivity is plotted.
As shown in fig. 11 and 12, the third intersection of the gas layer and the gas-water layer mixed zone in the gas group a and the intersection of the gas layer and the gas-water layer mixed zone in the gas group B are shown, respectively, and in fig. 11 and 12, the abscissa is Δ Rt and the ordinate is Rt (deep lateral resistivity).
S830: and according to the third intersection drawing, secondarily dividing the gas layer and gas-water layer mixing area.
According to the gas-water identification method for the compact water-containing gas reservoir, provided by the embodiment of the specification, the characteristics capable of representing the reservoir fluid property difference between the gas layer and the gas-water layer are obtained by analyzing the logging curve and are converted into a quantitative representation mode, so that the gas layer and the gas-water layer in the gas layer and gas-water layer mixed area are subjected to secondary separation, the logging interpretation coincidence rate can be greatly improved, and a more accurate reference is provided for reservoir development.
Further, S830: according to the third intersection diagram, the secondary division is carried out on the gas layer and the gas-water layer mixing area, and the method specifically comprises the following steps:
and determining a difference threshold value for dividing the gas-water zone and the gas-water same-zone according to the third intersection map.
As shown in fig. 11, in the group a, the minimum value of the difference (between the deep lateral resistivity curve and the shallow lateral resistivity) between the sample points of the gas zone is-0.3 Ω · m, and therefore, in the group a, the boundary between the gas zone and the gas-water homogeneous zone is Δ Rt = -0.3 Ω · m; similarly, as shown in fig. 12, in the gas group B, the minimum value of the difference between the sample points of the gas layer zone is-0.5 Ω · m, and therefore, the boundary between the gas layer zone and the gas-water homogeneous zone in the gas group B is Δ Rt = -0.5 Ω · m.
It should be noted that, since the gas formation is the best industrial production formation and the exploitation value of the gas formation is the highest, in the embodiment of the present specification, it is preferable to set the difference threshold as a depth lateral resistivity difference that can include the sample points of the test gas of all gas formation regions.
When the difference value of the gas testing sampling points is smaller than the difference value threshold value, determining that the gas testing sampling points correspond to the same gas-water zone; and when the difference value of the gas testing sampling points is larger than or equal to the difference value threshold value, determining that the gas testing sampling points correspond to the gas layer area.
In the gas group A, the boundary of a gas-water zone is more than or equal to-0.3 omega.m, and the boundary of a gas-water same-zone is less than-0.3 omega.m; in the B gas group, the boundary of the gas-water layer area is more than or equal to-0.5 omega-m, and the boundary of the gas-water same layer area is less than-0.5 omega-m.
After the gas layer and the gas-water layer mixed area are secondarily identified, the well logging interpretation coincidence rate of the gas group A reaches 93%, the well logging interpretation coincidence rate of the gas group B reaches 92%, and compared with the interpretation coincidence rate obtained without secondary division, the well logging interpretation coincidence rates of the gas group A and the gas group B are respectively improved by 53% and 57%.
Finally, the boundaries of the layers of different fluid properties for the target reservoir gas reservoir are shown in table 1.
TABLE 1
In summary, the method for identifying gas and water in a dense water-bearing gas reservoir provided by the embodiment of the specification firstly divides each gas group by the factors influencing the gas group, such as reservoir deposition environment, diagenetic action condition and the like; further dividing a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area and boundaries of all areas through the four-property parameters of the reservoir; finally, according to the micro-difference change of the depth lateral resistivity invasion characteristics, a gas layer area and a gas-water same-layer area in a gas layer and gas-water same-layer mixed area are divided for the second time, and finally, accurate limits of different fluid properties of a reservoir gas reservoir are obtained, so that the method is favorable for improving the calculation reliability of natural gas reserves, reasonably carrying out exploration, development and deployment, reducing the gas testing cost and improving the development economy; the method is simple, the research cost is low, and the method can be used for dividing the gas-water layer of any water-containing gas reservoir.
As shown in fig. 13, an embodiment of this specification further provides a schematic structural diagram of a gas-water identification device for a tight water-bearing gas reservoir, where the device includes:
an obtaining module 1310, configured to obtain a well logging curve of a target reservoir gas reservoir and reservoir interpretation parameters, where the reservoir interpretation parameters include lithology parameters, electrical parameters, physical parameters, and gas content parameters;
a gas group division module 1320, configured to divide the target reservoir gas reservoir into at least one gas group according to the deposition environment, the diagenesis condition, the lithology parameter, and the physical property parameter of the target reservoir gas reservoir;
a primary dividing module 1330, configured to perform primary division on each gas group according to the electrical parameter, the physical parameter, and the gas content parameter to obtain a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area, and boundaries of each area;
and a secondary division module 1340, which is used for carrying out secondary division on the gas layer and gas-water layer mixed area according to the logging curve to obtain a gas layer area and a gas-water layer area and a boundary.
The advantages achieved by the device provided by the embodiment of the specification are consistent with those achieved by the method, and are not described in detail herein.
As shown in fig. 14, which is a computer device provided in this embodiment, the tight water-bearing gas reservoir gas-water identification apparatus provided in this specification may be the computer device to perform the above method provided in this embodiment. The computer device 1402 can include one or more processors 1404, such as one or more Central Processing Units (CPUs), each of which can implement one or more hardware threads. Computer device 1402 may also include any memory 1406 for storing any kind of information, such as code, settings, data, etc. For example, and without limitation, memory 1406 may include any one or more of the following in combination: any type of RAM, any type of ROM, flash memory devices, hard disks, optical disks, etc. More generally, any memory may use any technology to store information. Further, any memory may provide volatile or non-volatile retention of information. Further, any memories may represent fixed or removable components of computer device 1402. In one case, when processor 1404 executes associated instructions stored in any memory or combination of memories, computer device 1402 can perform any of the operations of the associated instructions. Computer device 1402 also includes one or more drive mechanisms 1408 for interacting with any memory, such as a hard disk drive mechanism, an optical disk drive mechanism, and the like.
Corresponding to the methods shown in fig. 1 to 2, 5 and 8, the embodiments herein also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described method.
Embodiments herein also provide computer readable instructions, wherein a program therein causes a processor to perform the methods as shown in fig. 1-2, 5 and 8 when the instructions are executed by the processor.
Embodiments herein also provide a computer program product comprising at least one instruction or at least one program, the at least one instruction or the at least one program being loaded and executed by a processor to implement the methods shown in fig. 1-2, 5 and 8.
It should be understood that, in various embodiments herein, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments herein.
It should also be understood that, in the embodiments herein, the term "and/or" is only one kind of association relation describing an associated object, meaning that three kinds of relations may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
Those of ordinary skill in the art will appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided herein, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments herein.
In addition, functional units in the embodiments herein may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present invention may be implemented in a form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The principles and embodiments of the present disclosure are explained in detail by using specific embodiments, and the above description of the embodiments is only used to help understanding the method and its core idea; meanwhile, for the general technical personnel in the field, according to the idea of this document, there may be changes in the concrete implementation and the application scope, in summary, this description should not be understood as the limitation of this document.
Claims (10)
1. A dense water-bearing gas reservoir gas-water identification method is characterized by comprising the following steps:
acquiring a logging curve and reservoir interpretation parameters of a target reservoir gas reservoir, wherein the reservoir interpretation parameters comprise lithologic parameters, electrical parameters, physical parameters and gas-bearing parameters;
dividing the target reservoir gas reservoir into at least one gas group according to the deposition environment, diagenesis conditions, lithologic parameters and physical parameters of the target reservoir gas reservoir;
according to the electrical parameter, the physical property parameter and the gas-containing property parameter, each gas group is divided once to obtain a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area and the boundary of each area;
and carrying out secondary division on the gas layer and gas-water layer mixed area according to the logging curve to obtain a gas layer area, a gas-water layer area and a boundary.
2. The method of claim 1, wherein the lithology parameters include at least argillaceous content, the electrical parameters include at least electrical resistivity, the physical parameters include at least porosity, and the gas bearing parameters include at least water saturation.
3. The method of claim 2, wherein each gas group is divided into a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water same layer area and boundaries of each area according to the electrical parameter, the physical parameter and the gas content parameter, and further comprising:
drawing a first intersection graph according to the resistivity, the porosity and the water saturation of each gas group test gas sampling point;
and dividing the pure gas layer area, the gas layer and gas-water layer mixed area, the pure gas-water layer area and the boundary of each area according to the first intersection map.
4. The method of claim 1, wherein before the step of dividing each gas group into a pure gas layer area, a gas layer and water layer mixed area, a pure gas and water homogeneous layer area and the boundaries of each area according to the electrical parameter, the physical parameter and the gas content parameter, the method further comprises:
drawing a second intersection graph according to the resistivity and the argillaceous content of each gas group test gas sampling point;
determining lithology boundaries of each gas group according to the second intersection map;
and when the lithology boundary is less than or equal to a preset value, judging that the gas group has development value and executing a primary division step of the gas group.
5. The method of claim 1, wherein the well log of the target reservoir gas reservoir comprises a deep lateral resistivity curve and a shallow lateral resistivity curve.
6. The method of claim 5, wherein the gas layer and gas-water layer mixed area is divided for the second time according to the well logging curve to obtain a gas layer area and a gas-water layer area and a boundary, and further comprising:
calculating the difference value between the deep lateral resistivity and the shallow lateral resistivity of each gas testing sampling point in the gas layer and gas-water same layer mixed area;
drawing a third cross plot of the difference and resistivity;
and according to the third intersection diagram, performing secondary division on the gas layer and the gas-water layer mixed area.
7. The method of claim 6, wherein the gas layer and gas-water layer mixing area are divided secondarily according to the third intersection map, and further comprising:
determining a difference threshold value for dividing the gas-water zone and the gas-water same-zone according to the third intersection map;
when the difference value of the gas testing sampling points is smaller than the difference value threshold value, determining that the gas testing sampling points correspond to the same gas-water zone;
and when the difference value of the gas testing sampling points is greater than or equal to the difference value threshold value, determining that the gas testing sampling points correspond to the gas layer area.
8. The utility model provides a tight moisture gas reservoir gas-water identification equipment which characterized in that includes:
the system comprises an acquisition module, a storage layer analysis module and a storage layer analysis module, wherein the acquisition module is used for acquiring a logging curve and storage layer interpretation parameters of a target storage layer gas reservoir, and the storage layer interpretation parameters comprise lithologic parameters, electrical parameters, physical parameters and gas-bearing parameters;
the gas group dividing module is used for dividing the target reservoir gas reservoir into at least one gas group according to the deposition environment, the diagenesis condition, the lithology parameter and the physical property parameter of the target reservoir gas reservoir;
the primary division module is used for carrying out primary division on each gas group according to the electrical parameter, the physical property parameter and the gas content parameter to obtain a pure gas layer area, a gas layer and gas-water layer mixed area, a pure gas-water layer area and the boundary of each area;
and the secondary division module is used for carrying out secondary division on the gas layer and gas-water layer mixed area according to the logging curve to obtain a gas layer area and a gas-water layer area and a boundary.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the method of any one of claims 1 to 7.
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