CN-122022160-A - Quantitative evaluation method for lateral migration of petroleum based on grid transfer quantity

CN122022160ACN 122022160 ACN122022160 ACN 122022160ACN-122022160-A

Abstract

The invention discloses a quantitative evaluation method for lateral migration of petroleum based on grid transfer capacity, and relates to the technical field of oil and gas migration evaluation. According to the invention, macroscopic migration evaluation is sunk to a microscopic grid scale, the porosity and permeability change of the stratum are fully considered by the model, the fine shielding and guiding effects of a thin interlayer or physical properties on an oil gas path can be captured, fuzzy qualitative description is abandoned, a distribution coefficient calculation formula based on grid conductivity difference is innovatively introduced, whether lateral distribution of oil gas occurs can be judged more clearly, and how much lateral distribution is calculated accurately, so that the accuracy of resource quantity evaluation is greatly improved.

Inventors

Qiang Yijin
DING XIUJIAN
QU JIANGXIU
CHENG BIN

Assignees

中国石油大学(华东)

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (3)

1. The quantitative evaluation method for lateral migration of petroleum based on grid transfer quantity is characterized by comprising the following steps: S1, constructing a two-dimensional geological parameter grid model Obtaining geological data of a target research area, discretizing a vertical section of the target research area into m rows and n columns of grid units, wherein m is more than or equal to 10 and less than or equal to 1000, n is more than or equal to 10 and less than or equal to 1000, and aiming at each grid unit (i, j), wherein i is the number of rows and j is the number of columns, assigning corresponding physical parameters according to the geological data through a geostatistical interpolation method, and constructing a geological attribute matrix containing permeability data; S2, converting physical parameters into fluid migration capacity indexes Defining a conductivity index : ; Wherein, the The permeability of the grid is mD, deltax.Deltaz is the effective sectional area of the fluid passing through the grid unit, m 2 , mu is the viscosity of crude oil, and mPa.S, thereby obtaining a conductivity matrix corresponding to the geological grid; S3, judging and calculating 'migration-diversion' based on capacity difference Simulating the migration of hydrocarbon fluids from a current grid (i, j) to an overlying grid (i+1, j) assuming that the current grid (i, j) has a hydrocarbon migration volume to be allocated First, the interlayer conductance ratio R of the upper and lower grids is calculated: ; according to the principle of capability limitation, the following judgment is established: When the transmission and guiding capacity of the overlying grid (i+1, j) is more than or equal to that of the current grid (i, j), namely R is more than or equal to 1, physical shielding does not exist, oil gas is fully upwards transported under the buoyancy effect, and the oil gas migration amount is: Vertical migration volume ; Lateral shunt volume ; When the conductivity of the overlying grid (i+1, j) is smaller than that of the current grid (i, j), namely R <1, the vertical migration of oil gas is blocked, the vertical migration volume is capped by the relative capability R of the overlying grid (i+1, j), and the rest is forced to be converted into lateral flow, and a diversion coefficient lambda is introduced: ; At this time, the oil and gas migration volume is: Vertical migration volume ; Lateral shunt volume ; The generated lateral shunt quantity Q 2 can move to the left upper grid (i+1, j-1) and the right upper grid (i+1, j+1), and the oil gas migration quantities in two directions are as follows: ; ; S4, full-grid iteration and oil and gas migration volume accumulation, and dominant channel quantitative identification Based on the method in the step S3, iterative calculation of the grid oil gas migration volumes is carried out in a bottom-up sequence, the oil gas migration volumes are accumulated and added to obtain the final oil gas migration volume of each grid, an advantage migration threshold is set up, all grids meeting the oil gas migration volume > advantage migration threshold are extracted, connectivity visualization labeling is carried out on the grids on a two-dimensional section, and the formed connecting band is the lateral shunt advantage migration channel.
2. The quantitative evaluation method for lateral migration of petroleum based on "grid transfer" according to claim 1, wherein the grid at the boundary is considered only for vertical migration and lateral migration to the direction inside the grid cell, and lateral migration to the outside of the grid cell is not considered.
3. The quantitative evaluation method for lateral migration of petroleum based on "grid transfer" according to claim 1, wherein in step S4, dominant migration threshold = all grid hydrocarbon migration Maximum of 20%.

Description

Quantitative evaluation method for lateral migration of petroleum based on grid transfer quantity Technical Field The invention relates to the technical field of oil and gas migration evaluation, in particular to a quantitative evaluation method for lateral migration of petroleum based on grid transfer capacity. Background The current evaluation technology about oil gas migration and lateral diversion mainly comprises semi-quantitative analysis based on geometric forms, statistical evaluation based on multi-factor weights and experimental analysis based on physical simulation. In the aspect of geometric morphology analysis, the three-dimensional seismic data is mainly utilized to extract the section curvature attribute, and a multi-factor coupling formula is constructed by identifying the morphological characteristics of a section converging ridge and combining a section-source space-time matching relationship and a construction stress parameter so as to quantitatively represent the vertical conductivity of fracture (Li Honglin, zhang Rucai, wang Bingjie, and the like). In the aspect of comprehensive statistical evaluation, an expert scoring and weighted average method is adopted in the technical means, aiming at complex construction systems such as a submarine mountain and the like, key geological elements such as a trap scale, reservoir physical properties, migration distance, non-integrated surface structure and the like are selected to carry out assignment and weighted calculation by dividing the source internal mode, the source side mode and the source external mode, so that quantitative prediction models (Niu Chengmin, wang Feilong, she Tao, and the like) of the transportation and aggregation capacity are established. In the aspect of physical simulation mechanism analysis, a two-dimensional geological physical model is mainly built, sand bodies with different particle sizes are utilized to fill to simulate the heterogeneity among reservoir layers, a single oil phase continuous filling experiment is utilized to observe and count the lateral flow distribution rule of fluid under the condition of different reservoir permeability level differences, so that the control and storage modes (Liu Yuyang, yin Xiangdong, liu Xugang, and the like) under macroscopic sand breaking configuration are qualitatively or semi-quantitatively disclosed. Along with the deep penetration of oil gas exploration to heterogeneous reservoirs with stronger concealment and more complicated geological conditions, the fine depiction of oil gas migration paths is increasingly difficult, and the accurate identification of lateral migration and dominant channels becomes the key of oil gas enrichment rule research and dessert region prediction. The lateral diversion capability of oil gas in a heterogeneous reservoir is the basis of oil gas migration path evaluation, the former related research is mostly limited to macroscopic fracture geometric analysis or qualitative physical simulation rule summarization, the evaluation process has low grid resolution and large subjectivity, and the problems of more qualitative description and difficult quantitative calculation exist, so that the quantitative evaluation method of the lateral diversion proportion of the oil gas based on the physical property difference of the microscopic reservoir cannot be formed, the fine control effect of the local interlayer and the physical property on the oil gas migration direction cannot be well represented, and the current requirement of fine oil gas exploration is difficult to meet. Disclosure of Invention The invention aims to solve the technical problems of overcoming the defects of the prior art, providing a quantitative evaluation method for lateral migration of petroleum based on grid transfer capacity, sinking macroscopic migration evaluation to microscopic grid scale, fully taking the change of porosity and permeability of stratum into account by a model, capturing fine shielding and guiding effects of thin interlayer or physical interface on an oil-gas path, discarding fuzzy qualitative description, creatively introducing a calculation formula of a distribution coefficient based on grid transfer capacity difference, judging whether lateral distribution of oil gas occurs or not, and precisely calculating the lateral distribution quantity, thereby greatly improving the accuracy of resource quantity evaluation. The technical scheme of the invention is as follows: A petroleum lateral migration quantitative evaluation method based on 'grid transfer quantity' comprises the following steps: S1, constructing a two-dimensional geological parameter grid model Obtaining geological data (including but not limited to log curves, core data or geological stratification data) of a target research area, discretizing a vertical section of the target research area into m rows and n columns of grid units, wherein the value of m depends on the fineness degree of a stratum