CN-121995482-A - Rock stratum speed model building method and device, electronic equipment, medium and product

CN121995482ACN 121995482 ACN121995482 ACN 121995482ACN-121995482-A

Abstract

The application provides a rock stratum speed model building method, a rock stratum speed model building device, electronic equipment, a medium and a product. The method comprises the steps of obtaining root mean square amplitude of each first test position in a target rock stratum, obtaining vertical seismic profile speed and acoustic logging speed of each first test position, obtaining characteristic relation between the root mean square amplitude and the rock stratum speed according to the root mean square amplitude of each first test position, the vertical seismic profile speed and the acoustic logging speed of each first test position, obtaining the rock stratum speed according to the root mean square amplitude of each second test position of the target rock stratum based on the characteristic relation, and building a rock stratum speed model of the target rock stratum according to the rock stratum speed. According to the scheme provided by the application, the accuracy of the formation speed modeling result can be improved.

Inventors

LIU ZHENGWEN
YANG HAIJUN
PENG GENGXIN
LIU XIAOGUANG
YUAN LIAO
Pei jiading
ZHENG DUOMING
CUI YONGFU
ZOU QIANG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (12)

1. A method of formation velocity modeling, the method comprising: Acquiring root mean square amplitude of each first test position in the target rock stratum; Acquiring the measured vertical seismic profile speed and acoustic logging speed of each first test position, and acquiring the characteristic relation between the root mean square amplitude and the rock stratum speed according to the root mean square amplitude of each first test position, the vertical seismic profile speed of each first test position and the acoustic logging speed; Based on the characteristic relation, obtaining the rock stratum speed according to the root mean square amplitude of each second test position of the target rock stratum; and establishing a rock stratum speed model of the target rock stratum according to the rock stratum speed.
2. The method of claim 1, wherein the obtaining the root mean square amplitude for each first test location in the target formation comprises: Acquiring prestack depth migration pure wave data of the target rock stratum; And obtaining the root mean square amplitude of each first test position in the target rock stratum based on a root mean square amplitude calculation method according to the prestack depth migration data.
3. The method of claim 2, wherein the acquiring pre-stack depth migration pure wave data of the target formation comprises: collecting original seismic data; Performing prestack depth migration processing according to the original seismic data to obtain a migration imaging result; and extracting the prestack depth migration pure wave data from the migration imaging result.
4. The method according to claim 1, wherein the method further comprises: Calibrating a top boundary and a bottom boundary of the target rock stratum; and taking the top boundary and the bottom boundary as constraint conditions of the rock stratum speed model, and optimizing the rock stratum speed model.
5. The method according to claim 1, wherein the method further comprises: dividing the target rock stratum into different depth positions according to preset step length, and selecting a preset number of positions from the different depth positions to serve as the second test positions.
6. The method of claim 1, wherein obtaining a characteristic relationship between the root mean square amplitude and the formation velocity from the root mean square amplitude of each first test location and the vertical seismic profile velocity of each first test location and the acoustic logging velocity comprises fitting a fitting equation for the root mean square amplitude and the formation velocity from the root mean square amplitude of each first test location and the vertical seismic profile velocity of each first test location and the acoustic logging velocity.
7. The method of any of claims 1-6, wherein the target formation includes a plurality of well sites therein, and wherein prior to obtaining the root mean square amplitude for each first test location in the target formation, further comprising: dividing the well positions to obtain a test well position set and a verification well position set; Dividing the test well position set to obtain the first test positions and the second test positions.
8. The method of claim 7, wherein the method further comprises: Obtaining the rock stratum speed of each verification position under the verification well position set according to the rock stratum speed model; And verifying the rock stratum velocity model according to the rock stratum velocity of each verification position, the measured vertical seismic profile velocity and the measured acoustic logging velocity of each verification position, and obtaining a verification result.
9. A formation velocity model creation apparatus, comprising: The acquisition module is used for acquiring root mean square amplitude of each first test position in the target rock stratum; The acquisition module is also used for acquiring the measured vertical seismic profile speed and the acoustic logging speed of each first test position; The processing module is used for obtaining a characteristic relation between the root mean square amplitude and the rock stratum speed according to the root mean square amplitude of each first test position, the vertical seismic profile speed of each first test position and the acoustic logging speed; The modeling module is used for obtaining the rock stratum speed according to the root mean square amplitude of each second test position of the target rock stratum based on the characteristic relation, and establishing a rock stratum speed model of the target rock stratum according to the rock stratum speed.
10. An electronic device comprising a processor and a memory communicatively coupled to the processor; The memory stores computer-executable instructions; The processor executes computer-executable instructions stored in the memory to implement the method of any one of claims 1-8.
11. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1-8.
12. A computer program product comprising a computer program which, when executed by a processor, implements the method of any of claims 1-8.

Description

Rock stratum speed model building method and device, electronic equipment, medium and product Technical Field The application relates to the technical field of petroleum seismic exploration data processing, in particular to a rock stratum speed model building method, a rock stratum speed model building device, electronic equipment, a medium and a product. Background In oil exploration, the accuracy of velocity modeling directly affects the accuracy of the constructed map and the assessment of hydrocarbon resources. For example, in a region of a distribution of the cream salt, since the thickness of the cream salt varies greatly and is not clearly reflected in the seismic section, it is difficult to continuously trace. Thus, velocity modeling studies are needed through a variety of velocity information to build a highly accurate cream-salt model to better guide the seismic exploration work of the investigation region. The establishment of a velocity model plays an important role in the field of petroleum exploration and development. In the oil extraction process, the position of the paste rock stratum is an important basis for determining key parameters such as the high-point position of an oil layer, the oil reservoir area, the thickness and the like, and the speed of the paste rock stratum can be accurately calculated through paste rock salt speed modeling, so that the specific position of the paste rock stratum is identified in seismic data, and accurate geological information is provided for subsequent exploration and development work. Physical parameters such as porosity and permeability of a reservoir can be indirectly estimated through modeling of the rock salt speed of the paste, and important basis is provided for reservoir evaluation and development scheme formulation. The method has the advantages that the method has important guiding function in the drilling and production process, and by comparing the logging data in the actual drilling process with the data predicted by the speed model, the formation change can be found in time, the drilling scheme and the production strategy can be adjusted, and the smooth drilling and production can be ensured. At present, some speed modeling schemes use the speed of a test position to build a speed model, when the rock stratum structure is complex, the space distribution change is large, the speed change is large, and when the speed of the test position is used for building the model, the model is difficult to adapt to local severe transverse speed change, and the model is built inaccurately due to large speed error. Disclosure of Invention The application provides a rock stratum speed model building method, a rock stratum speed model building device, electronic equipment, a medium and a product, which are used for improving accuracy of a speed modeling result. The application provides a rock stratum velocity model building method, which comprises the steps of obtaining root mean square amplitude of each first test position in a target rock stratum, obtaining vertical seismic profile velocity and acoustic logging velocity of each first test position, obtaining characteristic relation between the root mean square amplitude and the rock stratum velocity according to the root mean square amplitude of each first test position, the vertical seismic profile velocity and the acoustic logging velocity of each first test position, obtaining the rock stratum velocity according to the root mean square amplitude of each second test position of the target rock stratum based on the characteristic relation, and building the rock stratum velocity model of the target rock stratum according to the rock stratum velocity. In one possible implementation, the method for obtaining the root mean square amplitude of each first test position in the target rock stratum comprises the steps of obtaining prestack depth migration pure wave data of the target rock stratum, and obtaining the root mean square amplitude of each first test position in the target rock stratum based on a root mean square amplitude calculation method according to the prestack depth migration data. In one possible implementation, acquiring pre-stack depth migration pure wave data of a target rock stratum includes acquiring original seismic data, performing pre-stack depth migration processing according to the original seismic data to obtain migration imaging results, and extracting the pre-stack depth migration pure wave data from the migration imaging results. In one possible implementation, the method further includes calibrating a top boundary and a bottom boundary of the target formation, and optimizing the formation velocity model using the top boundary and the bottom boundary as constraints on the formation velocity model. In one possible implementation, the method further includes dividing the target formation into different depth positions according to a preset step size, and selecting a preset number of p