Search

CN-121995490-A - Well control chromatography static correction method, system and medium for loess tableland area

CN121995490ACN 121995490 ACN121995490 ACN 121995490ACN-121995490-A

Abstract

The invention provides a well control chromatography static correction method, a well control chromatography static correction system and a well control chromatography static correction medium for loess tablelands, and belongs to the field of oil and gas geophysical exploration. The method comprises the steps of 100, inputting seismic data, 200, performing tomographic static correction processing on the seismic data to obtain a tomographic static correction value, 300, obtaining a well shock error value of a whole area, 400, applying the well shock error value of the whole area to the tomographic static correction value to obtain a new tomographic static correction value, 500, inverting according to the new tomographic static correction value to obtain a new near-surface velocity model, and 600, calculating by adopting the new near-surface velocity model to obtain the new static correction value. The invention comprehensively considers the seismic conditions, the current collection situation and the tomographic inversion characteristics of loess tablelands, utilizes the layered data of the wells to calibrate the constraint, corrects the static correction value error caused by tomographic static correction, finally reduces the well seismic error and ensures reasonable seismic structure imaging.

Inventors

  • CHEN YANCHUN
  • ZHU XIUYUN
  • YONG CHENTIAN
  • GU QINGLEI
  • XIE JINE

Assignees

  • 中国石油化工股份有限公司
  • 中石化石油物探技术研究院有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (10)

  1. 1. A well control chromatography static correction method for loess tablelands is characterized by comprising the following steps: step 100, inputting seismic data; Step 200, performing chromatographic static correction processing on the seismic data to obtain a chromatographic static correction value; step 300, obtaining well shock error values of the whole area; step 400, applying the well vibration error value of the whole area to the chromatographic static correction value to obtain a new chromatographic static correction value; step 500, inverting according to the new chromatographic static correction value to obtain a new near-surface velocity model; Step 600, a new near-surface velocity model is used to calculate a new static correction.
  2. 2. The method of claim 1, wherein step 300 comprises obtaining a full zone well shock error value, the operations comprising: step 310, applying the tomographic static correction amount to the seismic data, generating superposition data, and loading the generated superposition data to a seismic data interpretation system for target horizon pickup; Step 320, obtaining a well shock error value; Step 330, calculate the well-shock error value for the full zone.
  3. 3. The method of claim 2, wherein the obtaining of the well-shock error value in step 320 comprises: And subtracting the time of the target layer obtained after the calibration of the well logging curve through the synthesis record from the time of the target layer picked up in the step 310 to obtain an error value between the layering data of the well and the picked-up layer, namely a well earthquake error value.
  4. 4. The method of claim 3, wherein the step 330 of calculating the well-shock error value for the full zone comprises: And (3) performing the operations of step 310 and step 320 on all the wells in the work area to obtain corresponding error values of all the wells, and performing linear interpolation on the error values of all the wells to generate well earthquake error values of the whole area.
  5. 5. The method of claim 1, wherein the inverting in step 500 based on the new tomographic static correction amount obtains a new near-surface velocity model, and the specific operations include: inverting the new chromatographic static correction value to generate a shallow near-surface velocity model; And carrying out constraint tomography inversion on the inversion generated shallow near-surface velocity model to generate a new near-surface velocity model.
  6. 6. The method of claim 1, wherein the well control chromatographic static correction method of loess plateau region further comprises: Step 700, applying the new static correction value calculated in step 600 to the seismic data, and repeating the operations of step 200-step 600 until the new tomographic static correction value error value obtained in step 600 is smaller than the set value.
  7. 7. A well control chromatographic static correction system for loess tablelands, comprising: The input module is used for inputting the seismic data; the chromatographic static correction module is used for carrying out chromatographic static correction processing on the seismic data to obtain a chromatographic static correction value; The well earthquake error acquisition module is used for acquiring well earthquake error values of the whole area; The chromatographic static correction value updating module is used for applying the well shock error value of the whole area to the chromatographic static correction value to obtain a new chromatographic static correction value; The inversion module is used for inverting to obtain a new near-surface velocity model according to the new chromatographic static correction value; and the static correction value calculation module is used for calculating a new static correction value by adopting a new near-surface velocity model.
  8. 8. The system of claim 7, wherein the well-to-seismic error acquisition module comprises: The target horizon picking sub-module is used for applying the tomography static correction value to the seismic data, generating superposition data, and loading the generated superposition data to the seismic data interpretation system for target horizon picking; The first acquisition submodule is used for acquiring a well earthquake error value; And the second acquisition sub-module is used for calculating the well earthquake error value of the whole area.
  9. 9. The system of claim 7, wherein the inversion module comprises: the first inversion submodule is used for inverting the new chromatographic static correction value to generate a shallow near-surface velocity model; and the second inversion submodule is used for carrying out constraint tomography inversion on the inversion generated shallow near-surface velocity model to generate a new near-surface velocity model.
  10. 10. A computer-readable storage medium storing at least one program executable by a computer, which when executed by the computer, causes the computer to perform the steps in the well control tomography static correction method of loess tablelands as set forth in any one of claims 1 to 6.

Description

Well control chromatography static correction method, system and medium for loess tableland area Technical Field The invention belongs to the field of geophysical prospecting for oil and gas, and particularly relates to a well control chromatographic static correction method, a well control chromatographic static correction system and a well control chromatographic static correction medium for loess tablelands. Background In the three-dimensional seismic data processing of loess highland, the problems of static correction caused by lateral change of a near-surface structure and complex and changeable surface excitation receiving conditions are often faced, so that the well seismic errors caused by inaccurate static correction can be caused, and the reliability of result data is reduced. The static correction problem of loess tablelands is generally treated by various chromatographic static correction methods (such as refractive chromatographic static correction and grid chromatographic static correction), but the loess tablelands have certain adaptability. For general areas, due to the constraint of low-log data (generally micro-log data), the chromatographic static correction method adopting micro-log constraint chromatographic static correction or travel time chromatographic can effectively correct the effect of near-surface, and a better effect is obtained. However, the loess highland causes distortion of low-measurement data of the near-surface due to the ultra-thick loess, and the constraint inversion corresponding to the low-measurement data cannot truly reflect the speed change of the near-surface, so that inaccuracy of a static correction amount of the chromatographic static correction is caused, and finally, the well earthquake error is overlarge, so that an ideal correction effect is difficult to obtain. Disclosure of Invention The invention aims to solve the problems in the prior art and provide a well control chromatographic static correction method, a well control chromatographic static correction system and a well control chromatographic static correction medium for loess tablelands, which comprehensively consider the seismic conditions, the current acquisition situation and the chromatographic inversion characteristics of the loess tablelands, calibrate and restrict by using layered data of wells, correct static correction errors caused by chromatographic static correction, finally reduce well shock errors and ensure reasonable seismic structure imaging. The invention is realized by the following technical scheme: In a first aspect of the present invention, there is provided a well control chromatographic static correction method for loess tablelands, comprising the steps of: step 100, inputting seismic data; Step 200, performing chromatographic static correction processing on the seismic data to obtain a chromatographic static correction value; step 300, obtaining well shock error values of the whole area; step 400, applying the well vibration error value of the whole area to the chromatographic static correction value to obtain a new chromatographic static correction value; step 500, inverting according to the new chromatographic static correction value to obtain a new near-surface velocity model; Step 600, a new near-surface velocity model is used to calculate a new static correction. The invention further improves that: Step 300, obtaining a well shock error value of a whole area, which specifically comprises the following steps: step 310, applying the tomographic static correction amount to the seismic data, generating superposition data, and loading the generated superposition data to a seismic data interpretation system for target horizon pickup; Step 320, obtaining a well shock error value; Step 330, calculate the well-shock error value for the full zone. The invention further improves that: in step 320, a well-shock error value is obtained, and specific operations include: And subtracting the time of the target layer obtained after the calibration of the well logging curve through the synthesis record from the time of the target layer picked up in the step 310 to obtain an error value between the layering data of the well and the picked-up layer, namely a well earthquake error value. The invention further improves that: in step 330, the well-shock error value of the whole area is calculated, and specific operations include: And (3) performing the operations of step 310 and step 320 on all the wells in the work area to obtain corresponding error values of all the wells, and performing linear interpolation on the error values of all the wells to generate well earthquake error values of the whole area. The invention further improves that: in step 500, a new near-surface velocity model is obtained according to inversion of a new chromatographic static correction value, and the specific operations include: inverting the new chromatographic static correction value to generate a shallow nea