CN-121995479-A - Method, device, medium and equipment for establishing seismic layer velocity model of target layer

CN121995479ACN 121995479 ACN121995479 ACN 121995479ACN-121995479-A

Abstract

The invention discloses a method, a device, a medium and equipment for establishing a target layer seismic layer velocity model. The method for establishing the seismic layer velocity model of the target layer comprises the steps of obtaining data of seismic layer velocities of adjacent wells, selecting two adjacent wells, communicating a target layer on a seismic section, establishing a geological section of a connected well based on the seismic section, determining two major influencing factors influencing the layer velocities, and establishing a layer velocity model. According to the method for establishing the seismic layer velocity model of the target layer, the layer velocity of the deployment well is calculated by establishing the layer velocity model and substituting the drilled layer velocity value into the model, so that the calculation accuracy of the seismic layer velocity of the target layer of the risk exploratory well can be improved, and technical support is provided for predicting the target layer depth, making a drilling progress plan and evaluating economic benefits.

Inventors

WAN MIN
LIU LONGSONG
WANG XUEYONG
JIANG ZHONGFA
ZHAO HAOYU
ZHU YONGCAI
PAN JIN
SU DONGXU
ZHU FENG
JIANG MENGYA

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The method for establishing the seismic layer velocity model of the target layer is characterized by comprising the following steps of: acquiring data of adjacent well seismic layer speeds; selecting two adjacent wells, and communicating a target layer on the seismic section; Establishing a well connection geological section based on the seismic section; Determining two major influencing factors influencing the layer speed; and establishing a layer speed model.
2. The method for establishing a seismic layer velocity model of a target layer according to claim 1, wherein the data of the seismic layer velocity of the adjacent well is obtained through VSP logging calculation.
3. The method for modeling a seismic layer velocity of a destination layer according to claim 1, wherein determining two factors affecting the layer velocity comprises: marking the depth of the well-drilled target layer, the distance between wells and the layer speed value; establishing a model based on the layer speed, the distance and the burial depth of the adjacent well; two major influencing factors influencing the layer speed are determined based on geostatistical angle analysis.
4. A method of modeling a seismic layer velocity of a target layer as claimed in claim 3 wherein the two factors affecting the layer velocity include distance and burial depth.
5. A method of modeling a seismic layer velocity of a destination layer as claimed in claim 3 wherein, after determining two major influencing factors affecting the layer velocity based on geostatistical angle analysis, the method further comprises: The distance between three wells and the burial depth of the target layer are marked on the seismic section.
6. The method for establishing a seismic layer velocity model of a destination layer according to claim 1, wherein the establishing a layer velocity model comprises: Based on the calibration of the seismic profile, abstracting and establishing a mathematical model, wherein the mathematical model is a unitary quadratic parabolic form; A layer velocity model is built based on the surrounding drilled wells and the following formula: y＝f 1 (t 1 ,t 2 )x 2 +f 2 (k 1 ,k 2 ,k 3 )x+f 3 (t 1 ,t 2 ,k 1 ,k 2 ,k 3 ) (1) Wherein the two adjacent wells around are denoted by well A and well B, the deployment well is denoted by well C, t 1 denotes the distance between well A and well B, t 2 denotes the distance between well B and well C, k 1 denotes the well depth of well A, k 2 denotes the well depth of well B, k 3 denotes the well depth of well C, y denotes the unknown layer velocity, and x denotes the well-drilled layer velocity.
7. The method of establishing a seismic layer velocity model of a destination layer of claim 1, wherein after the establishing a layer velocity model, the method further comprises: Substituting the value of the layer speed of the drilled well into the model to calculate the layer speed of the deployment well.
8. The device for establishing the seismic layer velocity model of the target layer is characterized by comprising the following components: the acquisition module is used for acquiring data of the adjacent well seismic layer speed; The selection module is used for selecting two adjacent wells and communicating a target layer on the seismic section; the profile establishing module is used for establishing a well connecting geological profile based on the seismic profile; the determining module is used for determining two major influencing factors influencing the layer speed; and the model building module is used for building a layer speed model.
9. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of velocity modeling of a seismic layer of interest of any of claims 1-7.
10. A computing device, the computing device comprising: At least one processor, memory, and input output unit; The memory is used for storing a computer program, and the processor is used for calling the computer program stored in the memory to execute the method for establishing the destination layer seismic layer velocity model according to any one of claims 1-7.

Description

Method, device, medium and equipment for establishing seismic layer velocity model of target layer Technical Field The invention relates to the technical field of petroleum and natural gas geology and exploration and development, in particular to a method, a device, a medium and equipment for establishing a target layer seismic layer velocity model. Background Seismic layer velocity refers to the velocity of seismic wave propagation in a layered formation. It directly reflects the lithology of the formation and can be used to divide the formation. Velocity of seismic wave propagation in a homogeneous formation. It directly reflects the lithology of the formation. Accurate calculation of seismic layer velocity is particularly important for predicting well depth of a risk exploratory well, and directly affects target layer depth, drilling progress plan, economic benefit evaluation and the like. Therefore, modeling of the seismic zone velocity of the zone of interest is particularly important. In the prior art, the method for comprehensively establishing the initial depth layer speed model by combining earthquake geology recognition with the publication number of CN104360385B fully absorbs the advantages of the existing three initial depth layer speed model establishment methods, and simultaneously adopts the thought of multi-information constraint to comprehensively establish the initial depth layer speed model, so that the initial depth layer speed model is more accurate. However, the model established by the method still calculates inaccurately the seismic layer velocity of the risk exploratory well, so that the well depth of the deployed exploratory well cannot be calculated accurately, and errors of predicting the target layer depth, making a drilling progress plan and evaluating economic benefits are caused. Disclosure of Invention The invention mainly aims to provide a method, a device, a medium and equipment for establishing a target layer seismic layer velocity model, and aims to solve the technical problem that the well depth of a deployed exploratory well cannot be accurately calculated in the prior art. The method comprises the steps of obtaining data of adjacent well seismic layer speeds, selecting two adjacent wells, communicating a target layer on a seismic section, establishing a well connecting geological section based on the seismic section, determining two influencing factors influencing the layer speeds, and establishing a layer speed model. Optionally, the data of the adjacent well seismic layer velocity is obtained through VSP logging calculation. The method comprises the steps of determining two major influencing factors influencing the layer speed, namely marking the depth of a well which is drilled, the distance between wells and the layer speed value, establishing a model based on the layer speed, the distance and the burial depth of an adjacent well, and determining the two major influencing factors influencing the layer speed based on geostatistical angle analysis. Optionally, the two major factors affecting the layer speed include distance and burial depth. Optionally, after determining two major influencing factors affecting the zone velocity based on geostatistical angle analysis, the method further comprises marking the distance between three wells and the burial depth of the target zone on the seismic profile. Optionally, the establishing a layer velocity model comprises the steps of abstractly establishing a mathematical model based on the calibration of the seismic section, wherein the mathematical model is in a unitary quadratic parabolic form, and establishing the layer velocity model based on surrounding drilled wells and the following formula: y=f1(t1,t2)x2+f2(k1,k2,k3)x+f3(t1,t2,k1,k2,k3) (1) Wherein, two adjacent wells around are represented by well A and well B, the deployment well is represented by well C, t1 represents the distance between well A and well B, t2 represents the distance between well B and well C, k1 represents the well depth of well A, k2 represents the well depth of well B, k3 represents the well depth of well C, y represents the unknown layer velocity, and x represents the well-drilled layer velocity. Optionally, after the formation speed model is built, the method further comprises substituting the drilled formation speed value into the model to calculate the formation speed of the deployment well. In addition, in order to achieve the above purpose, the embodiment of the application also provides a device for calculating the velocity of the seismic layer of the objective layer, which comprises an acquisition module, a selection module, a section establishing module, a determining module and a model establishing module, wherein the acquisition module is used for acquiring data of the velocity of the seismic layer of an adjacent well, the selection module is used for selecting two adjacent wells to communicate with a target layer on the seismic sectio