Stratigraphic turning point marking method and device

Abstract

The formation turning point marking method and device provided by the present invention convert the seismic profile into a correspondence curve between the well trajectory length and the layer depth with obvious characteristics. The slope of each point can be statistically calculated by computer software through the correspondence curve, and then a formation dip angle change threshold is preset to determine whether it is a turning point. The entire calculation and processing process is clear and does not require manual subjective marking, thus saving manpower and material resources. At the same time, the formation dip angle change threshold provides a unified standard for measuring turning points, making the marking of turning points more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of oil field exploration, and more specifically, to a formation turning point marking method and device. Background Art

[0002] With the full development of shale gas reservoirs in the Sichuan Basin, seismic exploration is required to provide uninterrupted well location tracking services. An important part of this is to mark the formation turning points where the well trajectory is designed and calculate the formation dip. The current calculation methods are all based on visual recognition and manual calculation, which is not only time-consuming and labor-intensive, but also has large calculation errors. There is still a great deal of human subjectivity and lack of standards in the judgment criteria of turning points. Summary of the invention

[0003] In order to solve the above-mentioned shortcomings, a first aspect of the present invention provides a formation turning point marking method, comprising:

[0004] Obtaining a seismic profile at the location of the horizontal well section;

[0005] A corresponding relationship curve between well trajectory length and layer depth is drawn based on the layer depth data and seismic line number data in the seismic profile;

[0006] Determine the formation dip change threshold based on the geological requirements for drilling;

[0007] The formation turning point is marked according to the formation dip angle change threshold and the corresponding relationship curve.

[0008] In some embodiments, the formation turning point marking method further includes:

[0009] Performing smoothing on the corresponding relationship curve;

[0010] The step of determining the formation dip change threshold based on the geological requirements of drilling includes:

[0011] The threshold value of formation inclination change is determined according to the smoothness of the smoothing process and the geological requirements of drilling.

[0012] In some embodiments, marking the formation turning point according to the formation dip change threshold and the corresponding relationship curve includes:

[0013] Dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0014] In each interval, the first type of formation turning point is marked according to the slope signs before and after each point in the corresponding relationship curve. The first type of formation turning point is a point where the slope signs of two adjacent points before and after the corresponding relationship curve are opposite.

[0015] In some embodiments, marking the formation turning point according to the formation dip change threshold and the corresponding relationship curve includes:

[0016] Dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0017] In each interval, the second type of formation turning point is marked according to the slope change value between two adjacent points in the corresponding relationship curve and the formation inclination change threshold; the slope change value between the second type of formation turning point and the next adjacent point is greater than the formation inclination change threshold.

[0018] In some embodiments, the smoothing of the corresponding relationship curve includes:

[0019] The corresponding relationship curve is smoothed using a lowess smoothing function.

[0020] A second embodiment of the present invention provides a formation turning point marking device, comprising:

[0021] A seismic profile acquisition module, for acquiring a seismic profile at a location of a horizontal well section;

[0022] A corresponding relationship curve drawing module is used to draw a corresponding relationship curve between the well trajectory length and the layer depth according to the layer depth data and the seismic line number data in the seismic section;

[0023] A formation dip angle change threshold determination module, which determines the formation dip angle change threshold based on the geological requirements of drilling;

[0024] The formation turning point determination module marks the formation turning point according to the formation dip angle change threshold and the corresponding relationship curve.

[0025] In some embodiments, the formation turning point marking device further comprises:

[0026] A smoothing processing module, for smoothing the corresponding relationship curve;

[0027] The formation dip angle change threshold determination module determines the formation dip angle change threshold according to the smoothness of the smoothing process and the geological requirements of the drilling.

[0028] In some embodiments, the formation turning point determination module includes:

[0029] An interval division unit, dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0030] The first turning point determination unit marks the first type of formation turning points in each interval according to the slope signs before and after each point in the corresponding relationship curve. The first type of formation turning points are points where the slope signs of the two adjacent points before and after the corresponding relationship curve are opposite.

[0031] In some embodiments, the formation turning point determination module includes:

[0032] An interval division unit, dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0033] The second turning point determination unit marks the second type of formation turning point in each interval according to the slope change value between two adjacent points in the corresponding relationship curve and the formation inclination change threshold; the slope change value between the second type of formation turning point and the next adjacent point is greater than the formation inclination change threshold.

[0034] In some embodiments, the smoothing processing module uses a lowess smoothing function to smooth the corresponding relationship curve.

[0035] A third aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the formation turning point marking method as described above when executing the program.

[0036] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the formation turning point marking method as described above.

[0037] The beneficial effects of the present invention are as follows:

[0038] The formation turning point marking method and device provided by the present invention convert the seismic profile into a correspondence curve between the well trajectory length and the layer depth with obvious characteristics. The slope of each point can be statistically calculated by computer software through the correspondence curve, and then a formation dip angle change threshold is preset to determine whether it is a turning point. The entire calculation and processing process is clear and does not require manual subjective marking, thus saving manpower and material resources. At the same time, the formation dip angle change threshold provides a unified standard for measuring turning points, making the marking of turning points more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic flow chart of a formation turning point marking method according to an embodiment of the present invention is shown.

[0041] Figure 2 A seismic profile of a horizontal well section in an embodiment of the present invention is shown.

[0042] Figure 3 A comparison diagram of the layers before and after smoothing in an embodiment of the present invention is shown.

[0043] Figure 4 A comparison diagram of turning point identification in an embodiment of the present invention is shown.

[0044] Figure 5 A diagram of manually identifying turning points in an embodiment of the present invention is shown.

[0045] Figure 6 A schematic diagram of the structure of a formation turning point marking device in an embodiment of the present invention is shown.

[0046] Figure 7 A schematic diagram of the structure of an electronic device suitable for implementing an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Figure 1 A method for marking formation turning points is shown, comprising:

[0049] S1: Obtain the seismic profile at the location of the horizontal well section;

[0050] S2: drawing a corresponding relationship curve between well trajectory length and layer depth according to the layer depth data and seismic line number data in the seismic profile;

[0051] S2: Determine the formation dip change threshold based on the geological requirements of drilling;

[0052] S4: marking formation turning points according to the formation dip change threshold and the corresponding relationship curve.

[0053] The formation turning point marking method provided by the present invention converts the seismic profile into a correspondence curve between the well trajectory length and the layer depth with obvious characteristics. The slope of each point can be statistically calculated by computer software through the correspondence curve, and then a formation dip angle change threshold is preset to determine whether it is a turning point. The entire calculation and processing process is clear and does not require manual subjective marking, thus saving manpower and material resources. At the same time, the formation dip angle change threshold provides a unified standard for measuring turning points, making the marking of turning points more accurate.

[0054] In step S2, firstly, it is necessary to obtain the layer depth data and seismic line number data. Through the fine layer time domain interpretation results and the establishment of fine velocity field, the depth domain conversion of time domain data can be obtained to obtain the seismic depth layer of the designed target section 1×1 network density, including line number, track number, coordinates, and depth. If its bin size is B (m), the calculation accuracy along the well trajectory is in the range of (B~√2B); for the current three-dimensional acquisition, the bin size is generally 20×20, and the calculation accuracy is between 20 meters and 28.3 meters, that is, the step interval between data points is 20 meters to 28.3 meters, which meets the drilling accuracy requirements.

[0055] In step S3, the inclination change threshold is finally determined according to the drilling engineering requirements, which are determined according to the geological requirements of drilling. When the inclination change is greater than a certain degree, it can be regarded as a turning point change in a specific case, and the inclination change threshold is set accordingly.

[0056] In addition, in some embodiments, the above-mentioned formation turning point marking method further includes:

[0057] Performing smoothing on the corresponding relationship curve;

[0058] That is, step S3 in this embodiment is specifically as follows:

[0059] The threshold value of formation inclination change is determined according to the smoothness of the smoothing process and the geological requirements of drilling.

[0060] In this embodiment, affected by the data quality, the stratigraphic layer data may have slight jitter. This jitter cannot represent the change of the stratigraphic morphology, but it will affect the judgment of the stratigraphic turning point and the calculation of the dip angle, so it is necessary to smooth the depth domain data. According to the size of the facet, the precision and accuracy of the stratigraphic interpretation results, reasonable smoothing parameters and smoothing functions are set, and the target stratigraphic data are reasonably smoothed to eliminate the calculation interference caused by the slight jitter of the stratigraphic local data.

[0061] During the well tracking process, when the formation dip changes significantly, it is considered to be a formation turning point. However, the specific change that can be considered a turning point is very arbitrary in actual operation. In order to complete the automatic calculation of turning points, they are standardized into two types of turning points, Class I turning points and Class II turning points. For Class I turning points, they are upslope and downslope turning points, and the signs of the slopes before and after the turning point are opposite, which can be regarded as stationary points in the mathematical sense. For Class II turning points, the signs of the slopes before and after the turning point are the same, but the slope change value exceeds a certain threshold. Between turning points, the change in formation dip can be approximately considered unchanged and represented by the average dip.

[0062] That is, in some embodiments, the steps for confirming a type I turning point are as follows:

[0063] S41: Dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0064] S42: In each interval, a first type of formation turning point is marked according to the slope signs before and after each point in the corresponding relationship curve. The first type of formation turning point is a point where the slope signs of two adjacent points before and after the corresponding relationship curve are opposite.

[0065] The specific steps for confirming a Type II turning point are as follows:

[0066] S43: Dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0067] S44: In each interval, the second type of formation turning point is marked according to the slope change value between two adjacent points in the corresponding relationship curve and the formation inclination change threshold; the slope change value between the second type of formation turning point and the next adjacent point is greater than the formation inclination change threshold.

[0068] In the specific implementation, based on the smoothed stratigraphic data, the stratigraphic dip series is calculated, and the extreme point position of the stratigraphic dip curve is searched. The extreme point position searched is the mathematical turning point of the stratigraphic layer data, that is, the turning point where the concave and convex interface intersects; the stratigraphic layer curve is divided into multiple intervals, and the stratigraphic turning point search is performed on the stratigraphic data in each interval, which can be specifically divided into:

[0069] (a) If the turning point in the interval is a type I turning point, then when searching for the extreme point of the interval, theoretically there is only one extreme point;

[0070] (b) If the turning point in the interval is a Class II turning point, then search for the maximum inclination change value between single steps in the interval and compare it with the inclination change threshold. If it is greater than the inclination change threshold, then the point is considered to be a Class II turning point;

[0071] (c) If there is neither a type I inflection point nor a type II inflection point, the formation is considered to have no inflection point under that threshold;

[0072] Then, according to the intervals divided by the turning point, the average inclination value of the formation in each interval is calculated; the line number, coordinates and depth of the turning point are output and a plot is drawn; the average inclination value of the formation in each interval is output and a plot is drawn.

[0073] Based on this calculation procedure, work efficiency can be improved. Figure 4 As shown in the figure, calculating the formation dip and turning point of a well section about 2000 meters long used to take half an hour to several hours, but now it only takes 0.214 seconds (using the Lowess smoothing function). At the same time, this method can improve the accuracy of turning point judgment. Figure 3 At the position marked by the middle arrow, there is a big gap between the turning point identified by the program and the turning point recognized by humans. However, through data analysis, it is found that the average dip angle change before and after the turning point identified by the program is the largest in this interval, while the dip angle change before and after the turning point recognized by humans does not exceed the set threshold. It can be seen that the stratum turning point identified by the program can eliminate the subjectivity of human identification, and the turning point identification is more accurate.

[0074] It can be understood that the present invention converts the seismic profile into a correspondence curve between the well trajectory length and the layer depth with obvious characteristics. The slope of each point can be statistically calculated using computer software through the correspondence curve, and then a threshold value of the formation dip angle change can be preset to determine whether it is a turning point. The entire calculation and processing process is clear and does not require manual subjective labeling, saving manpower and material resources. At the same time, the threshold value of the formation dip angle change provides a unified standard for measuring turning points, making the marking of turning points more accurate.

[0075] The following is a specific scenario example. In the seismic software, a seismic profile at the location of the horizontal well section is intercepted, such as Figure 2 As shown. The axis below the double strong co-directional axis is the target layer, the horizontal axis is the seismic line number, and the vertical axis is the depth. It can be seen that due to the particularity of the seismic profile display, the horizontal axis is not the horizontal segment length data, and it is affected by the proportional display, and the dip angle cannot be directly read. At the same time, from the identification of the formation turning point on the profile, it can be seen that it is difficult to accurately determine the turning point position, and it is impossible to unify the standard.

[0076] The method of the present invention is specifically implemented in the following steps during specific operation: first, a new layer is created, and the layer depth data can be obtained by tracking this section of the target layer. The seismic depth layer of the designed target section 1×1 network density is exported from the seismic interpretation software, and is organized according to the format specifications of line number, channel number, x-coordinate, y-coordinate, and depth, and is placed in the program calculation path; the formation dip threshold is set. It needs to be set specifically according to the drilling geological requirements. If the formation is relatively smooth, the threshold can be slightly lowered; smoothing function, a total of six smoothing parameters are provided in the program, namely, average moving, Loess, Lowess, Robust Loess, Robust Lowess and Savitzky-Golay methods, corresponding to indicator parameters 1 to 6 respectively; select the degree of smoothing. The larger the value, the greater the smoothness; run the program, according to the smoothed curve graph ( Figure 3 ) to determine whether the smoothing of the stratum is reasonable; if the smoothing of the stratum is reasonable, continue to calculate the dip angle data between every two turning points, as well as the turning point diagram ( Figure 4 ); Figure 5 This is the identification map of the formation turning points after manual identification. It can be seen that the marking of the turning points is very random, the line number is not read accurately, and there is a 30-meter deviation for each line number difference. At the same time, it can be seen that the line number identification in the relatively flat area in the middle is very random, and it is quite different from the turning point position identified automatically. Through data inspection, the turning point position identified automatically is accurate, while there is a large deviation in manual identification.

[0077] In terms of time efficiency, drawing Figure 5 The section shown takes 1 hour, while the automatic identification program takes less than 1 second. Together with marking and other tasks, it can be completed within 10 minutes, greatly improving work efficiency.

[0078] Therefore, it can be understood that the formation turning point marking method provided by the present invention converts the seismic profile into a correspondence curve between the well trajectory length and the layer depth with obvious characteristics. The slope of each point can be statistically calculated using computer software through the correspondence curve, and then a formation dip angle change threshold is preset to determine whether it is a turning point. The entire calculation and processing process is clear and does not require manual subjective marking, saving manpower and material resources. At the same time, the formation dip angle change threshold provides a unified standard for measuring turning points, making the marking of turning points more accurate.

[0079] Figure 6 A formation turning point marking device according to an embodiment of the present invention is shown, comprising:

[0080] A seismic profile acquisition module 1 is used to acquire the seismic profile at the location of the horizontal well section;

[0081] A corresponding relationship curve drawing module 2 is used to draw a corresponding relationship curve between the well trajectory length and the layer depth according to the layer depth data and the seismic line number data in the seismic section;

[0082] A formation dip angle change threshold determination module 3 is used to determine the formation dip angle change threshold based on the geological requirements of drilling;

[0083] The formation turning point determination module 4 marks the formation turning point according to the formation dip angle change threshold and the corresponding relationship curve.

[0084] Based on the same inventive concept, in some embodiments, the formation turning point marking device further includes:

[0085] A smoothing processing module, for smoothing the corresponding relationship curve;

[0086] The formation dip angle change threshold determination module determines the formation dip angle change threshold according to the smoothness of the smoothing process and the geological requirements of the drilling.

[0087] Based on the same inventive concept, in certain embodiments, the formation turning point determination module includes:

[0088] An interval division unit, dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0089] The first turning point determination unit marks the first type of formation turning points in each interval according to the slope signs before and after each point in the corresponding relationship curve. The first type of formation turning points are points where the slope signs of the two adjacent points before and after the corresponding relationship curve are opposite.

[0090] Based on the same inventive concept, in certain embodiments, the formation turning point determination module includes:

[0091] An interval division unit, dividing the corresponding relationship curve into a plurality of intervals according to a set interval;

[0092] The second turning point determination unit marks the second type of formation turning point in each interval according to the slope change value between two adjacent points in the corresponding relationship curve and the formation inclination change threshold; the slope change value between the second type of formation turning point and the next adjacent point is greater than the formation inclination change threshold.

[0093] Based on the same inventive concept, in some embodiments, the smoothing processing module uses a lowess smoothing function to smooth the corresponding relationship curve.

[0094] It can be understood that the formation turning point marking device provided by the present invention converts the seismic profile into a correspondence curve between the well trajectory length and the layer depth with obvious characteristics. The slope of each point can be statistically calculated using computer software through the correspondence curve, and then a formation dip angle change threshold is preset to determine whether it is a turning point. The entire calculation and processing process is clear and does not require manual subjective marking, thus saving manpower and material resources. At the same time, the formation dip angle change threshold provides a unified standard for measuring turning points, making the marking of turning points more accurate.

[0095] The embodiment of the present invention also provides a specific implementation of an electronic device capable of implementing all the steps in the method in the above embodiment, see Figure 7 , the electronic device specifically includes the following contents:

[0096] Processor (processor) 601, memory (memory) 602, communication interface (CommunicationsInterface) 603 and bus 604;

[0097] The processor 601, the memory 602, and the communication interface 603 communicate with each other via the bus 604;

[0098] The processor 601 is used to call the computer program in the memory 602, and the processor implements all the steps in the method in the above embodiment when executing the computer program.

[0099] An embodiment of the present invention also provides a computer-readable storage medium capable of implementing all the steps in the method in the above embodiment, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, all the steps in the method in the above embodiment are implemented.

[0100] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. Although the embodiment of this specification provides the method operation steps described in the embodiment or flow chart, more or less operation steps can be included based on conventional or non-creative means. The order of steps listed in the embodiment is only one way of executing the order of many steps, and does not represent the only execution order. When the device or terminal product in practice is executed, it can be executed in sequence or in parallel according to the method shown in the embodiment or the accompanying drawings (for example, a parallel processor or a multi-threaded processing environment, or even a distributed data processing environment). The term "include", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or device including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such a process, method, product or device. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or device including the elements. For the convenience of description, the above device is described by dividing it into various modules according to its functions. Of course, when implementing the embodiments of this specification, the functions of each module can be implemented in the same one or more software and / or hardware, or the module implementing the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The present invention is described with reference to the flowchart and / or block diagram of the method, device (system) and computer program product according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the process and / or box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process Figure 1 A process or multiple processes and / or boxes Figure 1A device for specifying functions in a box or multiple boxes. It should be understood by those skilled in the art that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment. In the description of this specification, the description of the reference term "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction. The above description is only an embodiment of the embodiment of this specification and is not intended to limit the embodiment of this specification. For those skilled in the art, the embodiment of this specification may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the embodiment of this specification shall be included in the scope of the claims of the embodiment of this specification.

Claims

1. A method for marking formation turning points, characterized in that: include: Obtaining a seismic profile at the location of the horizontal well section; A corresponding relationship curve between well trajectory length and layer depth is drawn based on the layer depth data and seismic line number data in the seismic profile; Determine the formation dip change threshold based on the geological requirements for drilling; Marking a formation turning point according to the formation dip change threshold and the corresponding relationship curve; The formation turning point marking method also includes: Performing smoothing on the corresponding relationship curve; The step of determining the formation dip change threshold based on the geological requirements of drilling includes: Determine the formation dip change threshold according to the smoothness of the smoothing process and the geological requirements of drilling; The marking of the formation turning point according to the formation dip angle change threshold and the corresponding relationship curve includes: Dividing the corresponding relationship curve into a plurality of intervals according to a set interval; In each interval, a first type of formation turning point is marked according to the slope signs before and after each point in the corresponding relationship curve, and the first type of formation turning point is a point where the slope signs of two adjacent points before and after the corresponding relationship curve are opposite; Or, in each interval, the second type of formation turning point is marked according to the slope change value between two adjacent points in the corresponding relationship curve and the formation inclination change threshold; the slope change value between the second type of formation turning point and the next adjacent point is greater than the formation inclination change threshold.

2. The method for marking formation turning points according to claim 1, characterized in that: The smoothing of the corresponding relationship curve includes: The corresponding relationship curve is smoothed using a lowess smoothing function.

3. A stratum turning point marking device, characterized in that: include: A seismic profile acquisition module, for acquiring a seismic profile at a location of a horizontal well section; A corresponding relationship curve drawing module is used to draw a corresponding relationship curve between the well trajectory length and the layer depth according to the layer depth data and the seismic line number data in the seismic section; A formation dip angle change threshold determination module, which determines the formation dip angle change threshold based on the geological requirements of drilling; A formation turning point determination module is used to mark the formation turning point according to the formation dip change threshold and the corresponding relationship curve; The stratum turning point marking device also includes: A smoothing processing module, for smoothing the corresponding relationship curve; The formation dip angle change threshold determination module determines the formation dip angle change threshold according to the smoothness of the smoothing process and the geological requirements of the drilling; The formation turning point determination module comprises: An interval division unit, dividing the corresponding relationship curve into a plurality of intervals according to a set interval; A first turning point determination unit, in each interval, marks a first type of formation turning point according to the slope signs before and after each point in the corresponding relationship curve, wherein the first type of formation turning point is a point where the slope signs of two adjacent points before and after the corresponding relationship curve are opposite; Or, the second turning point determination unit marks the second type of formation turning point in each interval according to the slope change value between two adjacent points in the corresponding relationship curve and the formation inclination change threshold; the slope change value between the second type of formation turning point and the next adjacent point is greater than the formation inclination change threshold.

4. The stratum turning point marking device according to claim 3, characterized in that: The smoothing processing module uses a lowess smoothing function to smooth the corresponding relationship curve.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 2 is implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 2 is implemented.

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