Bilateral storage type logging curve semi-quantitative acceptance method

Abstract

The invention discloses a semi-quantitative acceptance method for a dual lateral storage type logging curve. The method comprises the following steps of: (1) performing preliminary qualitative acceptance through dual lateral logging experience of an adjacent well and a local area; (2) dual lateral resistivity semi-quantitative quality evaluation; voltage and current semi-quantitative quality evaluation; and (3) providing a rapid semi-quantitative acceptance result. According to the method, the defect that the quality of the dual-lateral storage type logging curve cannot be quickly controlled in the prior art is overcome, and the characteristics of a storage type process and a dual-lateral instrument are comprehensively considered; according to the semi-quantitative (regional experience and repeatability) method, the acceptance efficiency and accuracy of double lateral storage type logging curves of the following carbonate rocks in Ordovician such as North and Tahe oil fields are remarkably improved, and an important technical support is provided for evaluation and research of later reservoirs.

Description

Technical Field

[0001] This invention belongs to the field of oilfield exploration and development, specifically relating to a method for semi-quantitative acceptance of dual-lateral storage logging curves. Background Technology

[0002] For the Middle and Lower Ordovician carbonate rocks, such as the main target formations of the Shunbei and Tahe oilfields—two major production capacity development sites—dual-lateral storage logging curves used to evaluate electrical characteristics sometimes exhibit various quality issues, including poor curve repeatability, calibration errors, overall depth problems, and local curve delays. It is necessary to conduct acceptance testing as soon as possible after receiving the original dual-lateral storage logging data to prepare for subsequent rapid logging interpretation and later research.

[0003] In the prior art, for example, Chinese patent CN202210054585.X, “A composite teaching demonstration device and method for ordinary resistivity logging and dual-lateral logging,” simulates measurements of ordinary resistivity and dual-lateral logging. Chinese patent CN201710592371.7, “A quantitative evaluation method and device for dual-lateral logging,” analyzes the quantitative relationship between dual-lateral logging and different filling degrees of caverns. There is a lot of research on storage-type and dual-lateral logging, but there is no research on the acceptance method of dual-lateral storage-type curves, which makes it impossible to quickly and accurately complete curve quality control. Summary of the Invention

[0004] To address the practical problems of poor acceptance timeliness and weak technical specificity in existing technologies, and to achieve rapid and accurate acceptance of dual-lateral storage logging curves, this invention proposes a two-step acceptance method applicable to dual-lateral storage logging curves (regional experience, repeatability).

[0005] The technical solution of the present invention is as follows:

[0006] A method for semi-quantitative acceptance of dual-lateral storage logging curves, characterized by the following steps:

[0007] (1) Preliminary qualitative acceptance of the experience of bilateral lateral logging in adjacent wells and in this area;

[0008] (2) Semi-quantitative quality assessment of resistivity on both sides; semi-quantitative quality assessment of voltage and current;

[0009] (3) Provide rapid semi-quantitative acceptance results.

[0010] Preferably, in step (1), the adjacent wells are wells that are geographically close.

[0011] More preferably, the adjacent wells are wells that are geographically close and have similar underground geological structures.

[0012] Further preferably, in step (2), the semi-quantitative quality assessment of the dual-lateral resistivity specifically includes: using the data loaded from the first to fourth channels on the left side of the repeatability comparison template, comparing the repeatability and correlation of the upper and lower measurement curves of the entire well section using the left template, and checking the dynamic stability from low to high values; and providing the resistivity assessment results. The template is prior art known to those skilled in the art.

[0013] Further preferably, in step (2), the semi-quantitative quality assessment of voltage and current specifically includes: using the data loaded from the 5th to 6th channels on the left side of the repeatability comparison template, comparing the repeatability and correlation of the deep and shallow voltage and current auxiliary curves including the deep lateral original voltage, deep lateral original current, shallow lateral original voltage, and shallow lateral original current, and checking the instrument stability; and giving the auxiliary curve assessment results.

[0014] More preferably, the repeatability judgment index is based on the national standard SY / T 5123-2003.

[0015] Further preferably, the relative error of repeated measurements is less than 5%.

[0016] The beneficial technical effects of the present invention are as follows:

[0017] The acceptance method of this invention can evaluate various quality problems that sometimes occur in dual-lateral storage logging curves of electrical characteristics, including poor curve repeatability, calibration errors, overall depth problems, and local curve delays. It allows for prompt acceptance upon receiving the raw data from the direct-push dual-lateral logging, preparing for subsequent rapid logging interpretation and later research.

[0018] This invention addresses the shortcomings of existing technologies in rapidly controlling the quality of dual-lateral storage logging curves. Taking into account the characteristics of storage technology and dual-lateral instruments, this semi-quantitative (regional experience, repeatability) method significantly improves the acceptance efficiency and accuracy of dual-lateral storage logging curves for Middle and Lower Ordovician carbonate rocks, such as those in the Shunbei and Tahe oilfields, providing important technical support for subsequent reservoir evaluation and research. Attached Figure Description

[0019] Figure 1 This is a flowchart of a two-step acceptance process for dual-side storage according to an embodiment of the present invention;

[0020] Figure 2 A standardized template for repeatability comparison in Forward 2.7 software;

[0021] Figure 3 This document records an application example of a dual-lateral logging operation in the Shunbei 85X well. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to specific embodiments.

[0023] Example

[0024] This embodiment provides a two-step acceptance method for dual-lateral storage logging curves, such as... Figure 1 As shown, it includes the following steps:

[0025] (1) Preliminary qualitative acceptance of experience in adjacent wells and dual lateral logging in the local area. The adjacent wells mainly refer to wells that are geographically close. Wells that are geographically close and have similar underground geological structures are more conducive to carrying out the work.

[0026] (2) Semi-quantitative quality assessment of dual-lateral resistivity: Using the repeatability comparison template, load data from channels 1-4 on the left side, and compare the repeatability and correlation of the upper and lower measurement curves across the entire well section using the left template to check the dynamic stability from low to high values; provide the resistivity assessment results. Semi-quantitative quality assessment of voltage, current, etc.: Using the repeatability comparison template, load data from channels 5-6 on the left side, and compare the repeatability and correlation of deep and shallow voltage and current auxiliary curves such as ED, ID, ES, and IS to check the instrument stability; provide the auxiliary curve assessment results. The repeatability judgment index is based on the national standard SY / T 5123-2003, where the relative error of repeated measurements should be less than 5%. (ED: deep lateral original voltage, ID: deep lateral original current, ES: shallow lateral original voltage, IS: shallow lateral original current.)

[0027] (3) Provide rapid semi-quantitative acceptance results: whether the method is effective and how to judge the results.

[0028] Specifically, we selected a case study of a single dual-lateral logging operation from the Shunbei 85X well.

[0029] Includes the following steps:

[0030] (1) Based on the experience of neighboring wells and the local area, a preliminary qualitative assessment was conducted.

[0031] Compared with the bilateral lateral data of adjacent wells such as Shun 1X, such as Figure 3 The deep lateral resistivity (red) and shallow lateral resistivity (blue) values ​​in tracks 3 and 4 are shown. The values ​​on both sides of this well are lower than expected, which is inconsistent with the regional pattern. The data is questionable and needs to be re-logged for verification.

[0032] (2) Semi-quantitative quality assessment of two-sided resistivity, voltage and other curves.

[0033] use Figure 2 The template shown loads the raw data stored in the 1X well format, such as... Figure 3As shown in tracks 3 and 4 on the left, the local morphology of the upper and lower resistivity curves is similar, but the values ​​in both the deep and shallow lateral sections show significant jumps at well depths such as 8275m and 8375m, indicating poor repeatability. Looking at the range of numerical fluctuations, the median value region is relatively stable, but the transition from the median to the high value is not smooth, resembling a "jump," indirectly reflecting the poor dynamic stability of the instrument in the medium-to-high value region. The semi-quantitative quality assessment method for this resistivity curve is effective, but the assessment result is unqualified.

[0034] use Figure 2 The template shown loads the raw data stored in the 1X well format, such as... Figure 3 As shown in tracks 5 and 6 on the right, ED represents the deep lateral initial voltage, ID represents the deep lateral initial current, ES represents the shallow lateral initial voltage, and IS represents the shallow lateral initial current. The auxiliary voltage and current curves for these two lateral curves (ED, ID, etc.) exhibit similar local morphologies. The deep and shallow voltage values ​​represented by ED and ES show relatively stable changes and good repeatability in both upper and lower measurements. However, the ID values ​​for both deep and shallow lateral curves show significant fluctuations in well sections such as 8612.5m and 8631m, indicating poor repeatability, especially for the IS shallow current. Furthermore, abnormal numerical fluctuations also occur. This also explains why the third deep lateral curve in the figure – "Questionable" – fluctuates at mid-to-high values, similar to the results of the repeatability curve check. The appearance of even higher values ​​seems to exceed the dynamic range of the instrument, indicating poor instrument stability. The semi-quantitative quality assessment method for these voltage isoforms is effective, but the assessment result is unqualified.

[0035] (2) Using the above specific implementation plan, the data acceptance of this dual-lateral storage logging was quickly evaluated. The results of the qualitative acceptance based on regional experience in step 1 and the semi-quantitative acceptance based on resistivity and auxiliary curve repeatability in step 2 were both poor. The evaluation method is effective, but the evaluation result is unqualified.

[0036] Compared with existing dual-lateral storage logging acceptance methods, the present invention (based on regional experience and repeatability) is fast and accurate; therefore, the new method has advantages in rapid acceptance.

[0037] The above embodiments are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Researchers in the art can make some non-essential improvements and adjustments to the present invention based on the content of the present invention, all of which should fall within the protection scope of the claims of the present invention.

Claims

1. A method for semi-quantitative acceptance of dual-lateral storage logging curves, characterized in that... Includes the following steps: (1) Preliminary qualitative acceptance of the experience of bilateral lateral logging in adjacent wells and in this area; (2) Semi-quantitative quality assessment of resistivity on both sides; semi-quantitative quality assessment of voltage and current; (3) Provide rapid semi-quantitative acceptance results.

2. The method according to claim 1, characterized in that... In step (1), the adjacent wells are wells that are geographically close. Based on the preliminary design data, the lateral data of the wells that are relatively close are found and compared for similarity.

3. The method according to claim 2, characterized in that... The adjacent wells are those that are geographically close and have similar underground geological structures.

4. The method according to claim 1, characterized in that... In step (2), the semi-quantitative quality assessment of the dual-lateral resistivity specifically includes: loading data from the first to fourth channels on the left side of the repeatability comparison template, comparing the repeatability and correlation of the upper and lower measurement curves of the entire well section with the left template, and checking the dynamic stability from low to high values; and giving the resistivity assessment results.

5. The method according to claim 1, characterized in that... In step (2), the semi-quantitative quality assessment of voltage and current specifically includes: using the data loaded from channels 5-6 on the left side of the repeatability comparison template, comparing the repeatability and correlation of the deep and shallow voltage and current auxiliary curves including the deep lateral original voltage, deep lateral original current, shallow lateral original voltage, and shallow lateral original current, and checking the instrument stability; and giving the auxiliary curve assessment results.

6. The method according to claim 4 or 5, characterized in that... The calculation standard for repeatability is based on the national standard SY / T 5123-2003.

7. The method according to claim 6, characterized in that... The relative error of repeated measurements is less than 5%.

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