CN201747364U - Interval transit time curve reconstruction equipment - Google Patents

Abstract

The utility model discloses an acoustic wave time difference curve reconstruction device, comprising: a data acquisition device, a function relation storage device, a curve reconstruction processing device and a reconstruction data output device; The storage device and the reconstructed data output device are connected. The sonic transit time curve reconstruction equipment of the embodiment of the utility model can reconstruct the sonic transit time curve more accurately and rapidly, solves the problem that the reservoir porosity cannot be quantitatively obtained due to the lack of sonic transit time curve, and realizes the oil and gas reservoir The quantitative calculation of physical parameters can meet the needs of logging data interpretation and evaluation, and has a good application effect.

Description

A sonic time difference curve reconstruction device

technical field

The utility model relates to the technical field of petroleum well logging, in particular to an acoustic time difference curve reconstruction device. the

Background technique

In the field of oil exploration and logging technology, with the development of logging technology and logging instruments, the processing and interpretation of logging data can more truly reflect the conditions of underground reservoirs, but in some old wells that need to be re-interpreted, there are The well series are relatively old, and the logging curves are seriously missing. Some wells even only have caliper and potential or gradient curves, which brings great difficulties to the digital processing and interpretation of logging. Based on this, data mining and The research on log curve reconstruction is very necessary. the

Well log reconstruction is a method of obtaining well log curves by using the relationship between the existing well log curves and the curves to be constructed in the well logging project. In wells lacking well logging items, virtual well prediction technology and curve fitting methods can be used to obtain unmeasured well logging curves for calculation of reservoir parameters. the

Acoustic transit time is a main and commonly used method for studying section lithology and calculating reservoir porosity. Acoustic transit time curves can be used to synthesize seismic sections and carry out stratigraphic comparison and analysis, so it has important research significance. Therefore, for some wells with missing well logs, it is of great significance to use the existing well logs to reconstruct the acoustic time difference curves in the interpretation and evaluation of well log data. the

Utility model content

The purpose of this utility model is to provide a kind of acoustic time difference curve reconstruction equipment, including: data acquisition device, function relationship storage device, curve reconstruction processing device and reconstruction data output device; The data acquisition device, the function relationship storage device and the reconstruction data output device are connected; wherein, the data acquisition device includes: a resistivity data acquisition device for obtaining formation resistivity curve data, for obtaining logging depth The logging depth data acquisition device for curve data; the functional relationship storage device is used to store the calculation formula of the acoustic wave time difference curve; the described curve reconstruction processing device includes: for calculating the formula according to the described acoustic wave time difference curve, Resistivity curve data, logging depth curve data, and least squares method to generate the coefficient generation device for calculating the formula coefficient of the acoustic wave time difference curve, used for calculating the formula according to the described acoustic wave time difference curve, formation resistivity curve data, logging depth curve Data generating means for generating reconstruction result data of curve reconstruction results; said reconstruction data output means for outputting said curve reconstruction result data. The reconstruction data output device includes a reconstruction curve display device for displaying a set of reconstructed acoustic time difference DT values. the

The sonic transit time curve reconstruction device of the embodiment of the utility model can reconstruct the sonic transit time logging curve more accurately and quickly, solves the problem that the reservoir porosity cannot be quantitatively obtained due to the lack of sonic transit time curve, and realizes oil and gas The quantitative calculation of reservoir physical parameters can serve in time or meet the needs of logging data interpretation and evaluation, and has good application effect. the

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the utility model, constitute a part of the application, and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is the structural representation of the acoustic wave time difference curve reconstruction equipment of the utility model embodiment;

Fig. 2 is another kind of structural representation of the acoustic wave time difference curve reconstruction equipment of the utility model embodiment;

Fig. 3 is the method flowchart of utilizing the acoustic wave time difference curve reconstruction equipment of the embodiment of the present invention to generate the acoustic wave time difference curve;

Fig. 4 is a structural schematic diagram of Embodiment 1 in which the acoustic wave time difference curve is reconstructed by the acoustic wave time difference curve reconstruction device shown in Fig. 1 of the utility model;

Fig. 5 is the structural schematic diagram of Embodiment 2 in which the acoustic wave time difference curve is reconstructed by the acoustic wave time difference curve reconstruction device shown in Fig. 2 of the utility model;

Fig. 6 is a comparison chart between the reconstructed acoustic wave time difference curve and the measured acoustic wave time difference curve of the utility model embodiment three. the

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiment of the utility model and its description are used to explain the utility model, but not as a limitation to the utility model. the

FIG. 1 is a schematic structural diagram of an acoustic wave time difference curve reconstruction device according to an embodiment of the present invention. As shown in the figure, the acoustic wave time difference curve reconstruction device includes a data acquisition device 101 , a function relationship storage device 102 , a curve reconstruction processing device 103 and a reconstructed data output device 104 . in,

The data acquisition device 101 is used to acquire formation resistivity curve data and logging depth curve data. the

When reconstructing the acoustic time difference curve, the following principles must be followed: First, according to the geological characteristics of the reservoir in this area, multi-disciplinary integration, making full use of the relationship between logging information such as lithology, electrical and radioactivity, and acoustic properties The reconstructed characteristic curve can reflect the characteristics of the reservoir; the second is to ensure that the obtained data volume has a high resolution in the vertical direction and improve the accuracy of reservoir prediction. Understand in detail the geological background data of the area where the reconstructed acoustic transit time curve is located, analyze the characteristics of all logging curves of the well in detail, make sure that the reconstructed curve is the acoustic transit time curve, and analyze whether the formation resistivity curve and logging depth curve are good accurately reflect the reservoir characteristic information. Reconstruction of reservoir characteristic curve is based on the target of reservoir prediction, and integrates relevant information that is beneficial to reservoir prediction to obtain a characteristic curve that can highlight reservoir resolution. For the degree of indication of lithology change law, the reconstruction method is preferred. In this embodiment, since the formation resistivity curve and the logging depth curve can well reflect the characteristic information of the reservoir, they are used as the characteristic curves reconstructed from the acoustic time difference curve. the

In this embodiment, the data acquisition device 101 can be connected to an external well logging curve database, from which to acquire formation resistivity curves, well logging depth curves and corresponding data. The external logging curve database is the actual curve obtained through various logging tests, including: formation resistivity curve, logging depth curve, potential resistivity curve, gradient resistivity curve, natural gamma ray curve, borehole diameter curve, natural potential curves and lateral resistivity curves. But the utility model obtains formation resistivity curve data and the method of logging depth curve data not limited to this, can also adopt the mode of manual input, import each data into the sonic time difference curve reconstruction equipment by the mode of data table, to carry out Subsequent calculations. the

The function relationship storage device 102 is used for storing the calculation formula of the acoustic time difference curve. the

其中，DT为声波时差曲线数据，Dep为数据获取装置101获取的测井深度曲线数据，Rt为地层电阻率曲线数据，x₁、x₂为设定的拟合指数，C₀、C₁为待定系数。此函数关系为Faust公式的变形，Faust公式表征地层电阻率曲线与声波曲线之间的统计关系，在电阻率曲线与声波曲线之间具有良好统计关系的地层，在声波时差曲线严重失真的情况下，利用Faust公式进行声波时差曲线重构的效果较好。 Described sound wave time difference curve calculation formula function relation is:

Among them, DT is the acoustic time difference curve data, Dep is the logging depth curve data acquired by the data acquisition device 101, Rt is the formation resistivity curve data, x ₁ and x ₂ are the set fitting indices, C ₀ and C ₁ are undetermined coefficient. This functional relationship is a deformation of the Faust formula. The Faust formula characterizes the statistical relationship between the formation resistivity curve and the acoustic wave curve. In the formation with a good statistical relationship between the resistivity curve and the acoustic wave curve, in the case of serious distortion of the acoustic wave travel time curve , using the Faust formula to reconstruct the acoustic wave time-difference curve has a better effect.

The curve reconstruction processing means 103 is configured to reconstruct and generate the acoustic wave time difference curve by using the least square fitting method according to the calculation formula of the acoustic wave time difference curve in the functional relationship storage means 102 . the

中利用最小二乘拟合法拟合生成待定系数C₀、C₁的值，最后将获取的地层电阻率曲线和测井深度曲线代入生成的确定了待定系数和拟合指数的函数关系式中，从而生成声波时差曲线。但本实用新型不限于此，曲线重构处理装置103也可以采用规划求解的方法，利用excel中的规划求解功能，直接导入多组数据，得出待定系数C₀、C₁的值。 In this embodiment, the curve reconstruction processing device 103 generates acoustic wave time difference curve reconstruction result data according to the acoustic wave curve calculation formula, formation resistivity curve data, and logging depth curve data. First set the fitting index x ₁ and x ₂ values, and then according to the acquired formation resistivity curve data and logging depth curve data, in the formula

In the process, the least square fitting method is used to fit and generate the values of undetermined coefficients C ₀ and C ₁ , and finally the obtained formation resistivity curve and logging depth curve are substituted into the generated functional relational formula that determines the undetermined coefficient and fitting index, A sonic transit time curve is thus generated. But the utility model is not limited thereto. The curve reconstruction processing device 103 can also adopt the method of planning and solving, and use the planning and solving function in excel to directly import multiple sets of data to obtain the values of undetermined coefficients C ₀ and C ₁ .

The values of fitting indices x ₁ and x ₂ are obtained based on a large amount of statistical data. In this example, x ₁ is set to -0.1666 and x ₂ is set to -0.1667, and it is found that the reconstructed acoustic wave time difference curve It can better reflect the characteristics of the formation, and has a good consistency with the logging acoustic time difference of the formation.

The reconstructed data output device 104 is configured to output and display the generated acoustic wave time difference curve as a result of reconstruction of the acoustic wave time difference curve. The reconstructed data output device 104 includes a reconstructed curve display device for displaying a reconstructed reconstruction curve of a set of acoustic time difference DT values. the

Fig. 2 is another structural schematic diagram of the acoustic wave time difference curve reconstruction device according to the embodiment of the present invention. In the embodiment shown in Figure 1, the data acquisition device includes a logging depth data acquisition device 1011 and a resistivity data acquisition device 1012, wherein the logging depth data acquisition device 1011 is used to acquire logging depth curve data, resistivity data The acquiring device 1012 is used to acquire formation resistivity curve data. the

The curve reconstruction processing device 103 includes a coefficient generating device 1031 and a reconstruction result generating device 1032, wherein the coefficient generating device 1031 is used to calculate the formula according to the acoustic time difference curve, the formation resistivity curve data, the logging depth curve data and the minimum The coefficients of the acoustic curve calculation formula are generated by the square method; the reconstruction result generation device 1032 is used to generate curve reconstruction result data according to the acoustic wave curve calculation formula, formation resistivity curve data, and logging depth curve data. the

In this embodiment, the least squares fitting method is used to generate the undetermined coefficients, and the method of planning and solving can also be used, that is, the obtained formation resistivity curve data and logging depth data are imported into the planning and solving module of excel, and the undetermined coefficients are obtained by direct fitting Values of coefficients C ₀ , C ₁ .

Fig. 3 is a flowchart of a method for generating an acoustic time difference curve by using the acoustic wave time difference curve reconstruction device according to an embodiment of the present invention. as the picture shows:

Step S101, acquiring formation resistivity curve data and logging depth curve data. the

First, understand the geological background data of the area where the acoustic transit time curve to be reconstructed is located in detail, analyze the characteristics of all logging curves of the well in detail, make sure that the reconstructed curve is the acoustic transit time curve, and analyze whether the formation resistivity curve and the logging depth curve are It can well reflect the reservoir characteristic information. Reconstruction of reservoir characteristic curve is based on the target of reservoir prediction, and integrates relevant information that is beneficial to reservoir prediction to obtain a characteristic curve that can highlight reservoir resolution. For the degree of indication of lithology change law, the reconstruction method is preferred. In this embodiment, the formation resistivity curve and the logging depth curve can well reflect the characteristic information of the reservoir, so they are used as the characteristic curves reconstructed from the acoustic time difference curve. the

In this embodiment, formation resistivity curve data and well logging depth curve data can be obtained by connecting to an external well logging curve database. Logging data in the external logging curve database includes: formation resistivity curve, logging depth curve, potential resistivity curve, gradient resistivity curve, natural gamma ray curve, borehole diameter curve, spontaneous potential curve and lateral resistivity curve . the

Step S102, establishing a functional relationship between the acoustic transit time curve and the formation resistivity curve data and logging depth curve data, that is, the acoustic transit time curve calculation formula. The functional relationship described is:

其中，DT为声波时差曲线，Dep为所述测井深度曲线数据，Rt为所述地层电阻率曲线数据，x₁、x₂为设定的拟合指数，C₀、C₁为待定系数。 

Among them, DT is the acoustic time difference curve, Dep is the data of the logging depth curve, Rt is the data of the formation resistivity curve, x ₁ and x ₂ are the set fitting indices, and C ₀ and C ₁ are undetermined coefficients.

Step S103, according to the functional relationship, adopt the least squares fitting method to generate the acoustic wave time difference curve, and output the generated acoustic wave time difference curve as the acoustic wave time difference result. First, set the values of the fitting indices x ₁ and x ₂ , use the least squares fitting method to calculate the values of the undetermined coefficients C ₀ and C ₁ , and substitute the acquired formation resistivity curve data and logging depth curve data , to obtain the reconstructed acoustic time difference curve data, and output the curve composed of this group of data as the acoustic wave time difference curve, or after calculating the values of the undetermined coefficients C ₀ and C ₁ , the formation resistivity curve and the logging depth The curve is brought into the complete calculation formula of the sound wave time difference curve, and the reconstructed sound wave time difference curve is obtained directly.

Embodiment one:

FIG. 4 is a schematic structural diagram of Embodiment 1 of the utility model in which the acoustic wave time difference curve reconstruction device shown in FIG. 1 is used to reconstruct the acoustic wave time difference curve. As shown in the figure, 10 is the acoustic wave time difference curve reconstruction device shown in FIG. The data acquisition device 101 acquires the formation resistivity curve data and the logging depth curve data from the external curve data storage library 20, and the curve reconstruction processing device 103 obtains the formation resistivity curve data and the logging depth curve data according to the functional relationship storage device 102 and the data acquisition device. For the well depth curve data, the reconstructed acoustic wave time difference curve data is obtained by the method of least square fitting or planning solution, and the reconstruction curve composed of a group of acoustic wave time difference curve data is mapped to an external display through the reconstructed data output device 104 displayed on the device 30. the

Embodiment two:

FIG. 5 is a schematic structural diagram of Embodiment 2 of the present invention in which the acoustic wave time difference curve reconstruction device shown in FIG. 2 is used to reconstruct the acoustic wave time difference curve. As shown in the figure, 10' is the acoustic wave time difference curve reconstruction device shown in Figure 2, which includes a logging depth data acquisition device 1011, a resistivity data acquisition device 1012, a function relationship storage device 102, a coefficient generation device 1031, a reconstruction The result generation means 1032 and the reconstructed data output means 105 . In this embodiment, the reconstruction data output device is a reconstruction curve display device for displaying a reconstruction curve formed by a set of acoustic wave time difference curve data. Wherein, manual input is adopted, and the personnel 20' manually input the formation resistivity data and logging depth data to the logging depth data acquisition device 1011 and the resistivity data acquisition device 1012 of the acoustic wave time difference curve reconstruction device. Manually input data can be directly imported in the form of a data table, and the coefficient generation device 1031 can calculate the formula according to the acoustic wave time difference curve in the functional relationship storage device 102 As well as the input data, the values of the undetermined coefficients C ₀ and C ₁ are obtained directly by means of planning and solving, and then the reconstruction result generation device can substitute the formation resistivity curve data and logging depth curve data into the complete acoustic wave time difference curve calculation In the formula, a set of reconstructed acoustic wave time-difference curve data is obtained and transmitted to the reconstructed curve display device 105 for curve display, so as to facilitate later data analysis.

Embodiment three:

In this embodiment, a well with measured acoustic time difference curve data in an oil field is selected for comparative analysis and effect inspection with the reconstructed acoustic time difference curve. The specific implementation method is carried out according to the following steps. As shown in Table 1, Table 1 is a comparison table of formation resistivity curve data, logging depth curve data, measured acoustic wave time difference curve data and reconstructed acoustic wave time difference curve data in Embodiment 3 of the utility model. the

Table 1

(us/m) (us/m) 5260.0 231.7 3.76 223.2 -3.8 5260.2 225.2 5.77 216.1 -4.2 5260.4 214.4 7.52 211.9 -1.2 5260.6 206.5 9.52 208.3 0.9 5260.8 202.5 10.09 207.4 2.4 5261.0 200.4 9.80 207.9 3.6 5261.2 199.4 10.09 207.4 3.9 5261.4 198.6 9.80 207.9 4.5 5261.6 199.3 10.55 206.8 3.6 5261.8 201.9 9.10 209.0 3.4 5262.0 208.7 6.03 215.3 3.1 5262.2 215.8 4.83 219.0 1.4 5262.4 221.7 4.11 221.7 0.0 5262.6 224.6 4.42 220.5 -1.9 5262.8 228 3.76 223.2 -2.1 5263.0 230.1 3.60 224.0 -2.7 5263.2 229.7 3.34 225.3 -2.0 5263.4 226.2 3.55 224.2 -0.9 5263.6 223.3 4.49 220.2 -1.4 5263.8 221.9 3.87 222.7 0.4 5264.0 221.5 4.69 219.5 -0.9 5264.2 220.7 5.20 217.7 -1.4 5264.4 221.5 5.60 216.5 -2.3 5264.6 223 5.13 218.0 -2.3 5264.8 223.2 4.83 219.0 -1.9 5265.0 219.3 5.60 216.5 -1.3 5265.2 212.1 7.19 212.5 0.2

The specific steps of the reconstructed acoustic wave time difference curve in this embodiment are as follows:

1) Understand the geological background data of the area where the reconstructed acoustic time difference curve is located, analyze the characteristics of the formation resistivity curve Rt, make sure that the reconstructed curve is the acoustic time difference curve, and analyze whether the formation resistivity curve Rt and the acoustic wave time difference curve are good accurately reflect the reservoir characteristic information. If so, the formation resistivity curve Rt and its corresponding formation resistivity curve data, the logging depth curve Dep and its corresponding logging depth curve data stored in the external curve data storage library are acquired by the data acquisition device. In this embodiment, the acquired logging curve depth section is 5260m-5295m, the sampling interval is 0.2m, and the formation resistivity curve data is the formation resistivity data of 175 corresponding depth sections. Its specific data values are shown in the first and third columns of Table 1. The second column of data is the measured acoustic wave time difference curve data, so as to compare with the acoustic wave time difference curve data reconstructed by the utility model. the

2) The calculation formula of the acoustic time difference curve stored in the functional relationship storage device 102 is:

本实施例中，设定：x₁＝-0.1666、x₂＝-0.1667。 

In this embodiment, set: x ₁ =-0.1666, x ₂ =-0.1667.

In this example, according to the statistics of a large number of geological and logging data in an oilfield, the fitting index _x1 is set to -0.1666, and _x2 is set to -0.1667, and the reconstructed acoustic wave time difference curve can better reflect The geological characteristics of the formation are in good agreement with the logging acoustic time difference of the formation, so in this embodiment, x ₁ is set to -0.1666, and x ₂ is set to -0.1667.

3) The curve reconstruction processing device 103 uses the functional relationship and fitting index of the reconstructed acoustic time difference curve obtained in step 2) and the formation resistivity curve data and logging depth curve data obtained in step 1) (as shown in Table 1) , using the least square fitting method to calculate the undetermined coefficients C ₀ and C ₁ , and obtain C ₀ =120.917 and C ₁ =248.687. Therefore, the generated functional relationship formula is:

DT＝119.037+541.857*Dep ^(-0.1666) *R _t ^(-0.1667)

Substituting the formation resistivity curve Rt and the logging depth curve Dep obtained in step 1) of the well where the acoustic time difference curve to be reconstructed is obtained, the reconstructed acoustic time difference curve DT can be obtained. the

4) Output and display the generated acoustic wave time difference curve DT through the reconstructed data output device 30 . The displayed results are shown in Figure 6. Curve ① is the original sound wave time difference curve, and curve ② is the reconstructed sound wave time difference curve. the

According to the depth data of table 1 and formation resistivity curve data, error verification is carried out to the acoustic wave time difference curve reconstructed by the acoustic wave time difference curve reconstruction equipment of the present utility model, the second column in table 1 is the measured acoustic wave time difference curve data, According to the utility model, when Depth is 5260.0m, Rt is 3.76 ohms. Meter, obtain:

DT＝119.037+541.857*Dep ^(-0.1666) *R _t ^(-0.1667)

＝119.037+541.857* ^{5260.0-0.1666} * ^3.76-0.1667

＝119.037+541*0.2399295696415191*0.8018925639919395

＝119.036+104.252

＝223.288

It has been verified that the relative error between the calculation result obtained according to the formula of this embodiment and the measured value of 231.7 is only -3.8%, that is, the curve trend is basically consistent. the

When Depth is 5292.8m and Rt is 4.17 ohm.m, get:

DT＝119.037+541.857*Dep ^(-0.1666) *R _t ^(-0.1667)

＝119.037+541.857* ^{5292.8-0.1666} * ^4.17-0.1667

＝119.037+541*0.23968121548445775*0.78817620543003028233

＝119.036+102.201

＝221.237

It has been verified that the relative error between the calculation result obtained according to the formula of this embodiment and the measured value of 221.5 is only -0.1%, that is, the curve trend is basically consistent, which can well reflect the geological characteristics of the reservoir. the

Fig. 6 is a comparison chart between the reconstructed acoustic wave time difference curve and the measured acoustic wave time difference curve according to the embodiment of the utility model. It can be seen from Table 1 and Figure 6 that the trend of the reconstructed acoustic time difference curve of the utility model is consistent with that of the measured acoustic wave time difference curve, which can better reflect the geological characteristics of the reservoir, and the application effect is very good. the

Utilizing the acoustic wave time difference method and equipment of the embodiment of the utility model, the acoustic wave time difference curve can be reconstructed more accurately and quickly, which solves the problem that the reservoir porosity cannot be quantitatively obtained due to the lack of the sound wave time difference curve, and realizes the physical properties of oil and gas reservoirs. The quantitative calculation of parameters can serve in time or meet the needs of logging data interpretation and evaluation, and has a good application effect. the

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present utility model in detail. Within the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model. the

Claims (3)

1. A kind of acoustic time difference curve reconstruction equipment, it is characterized in that, described acoustic wave time difference curve reconstruction equipment comprises: data acquisition device, function relationship storage device, curve reconstruction processing device and reconstruction data output device; The curve reconstruction processing device is respectively connected with the data acquisition device, the function relationship storage device and the reconstruction data output device; wherein, The data acquisition device includes: a resistivity data acquisition device for obtaining formation resistivity curve data, and a logging depth data acquisition device for obtaining logging depth curve data; The functional relationship storage device is used to store the calculation formula of the acoustic wave time difference curve; The curve reconstruction processing device includes: a coefficient generation device for generating coefficients of the acoustic time difference curve calculation formula according to the acoustic time difference curve calculation formula, formation resistivity curve data, logging depth curve data and least square method A reconstruction result generation device for generating curve reconstruction result data according to the acoustic wave time difference curve calculation formula, formation resistivity curve data, and logging depth curve data; the reconstruction data output device is used to output the Reconstruct the result data from the above-mentioned acoustic wave time difference curve. 2. The acoustic wave time difference curve reconstruction device according to claim 1, wherein said reconstructed data output means comprises: a reconstruction curve display means for displaying a set of reconstructed acoustic wave time difference DT values. 3. The acoustic wave time difference curve reconstruction device according to claim 1, characterized in that, said reconstructed data output device comprises: a reconstructed curve data output device for outputting a set of acoustic wave time difference DT values. the

Images