Three-dimensional data construction method

(1) Block diagram of 3D geophysical anomaly fitting data volume (see Figure 3-77)

The key factors of constructing 3D integrated geophysical exploration data platform in the survey area are as follows:

1) Establish a scientific and feasible three-dimensional data structure and spatial grid.

2) Collection, processing and interpretation of multivariate exploration information data and standardization of data format.

3) Unified stratigraphic physical meaning and attribute interpretation of three-dimensional coordinate points.

Figure 3-77 Block diagram of 3D data volume for comprehensive geophysical exploration of loose aquifer

(2) Grid processing of exploration area

Exploration area gridding is the main method to construct spatial three-dimensional data structure. After the exploration area is finely surveyed, the plane coordinate data can be gridded according to the requirements of exploration degree and accuracy, and then the depth coordinate grid with certain accuracy is discretely set according to the exploration depth to form a grid array of XYZ spatial coordinate three-dimensional information data, that is, A(x, y, z) represents the geological attributes of aquifer and the spatial positioning of coordinate points (Figure 3-78).

(3) Stratigraphic interpretation of three-dimensional coordinate points

For the exploration data information collected by loose aquifer, the standardized protocol and processing of multivariate data format need to deal with the geophysical attributes and geological significance of all coordinate points in underground space. Because we have collected all kinds of survey data, the data volume system has agreed to use the properties of loose strata (such as the classification properties of clay layer, fine sand layer, coarse sand layer and gravel layer) and the spatial positioning data of strata (such as the positioning coordinates of buried depth and thickness). See the underground space for the data structure of all coordinate points.

Figure 3-78 Schematic Diagram of Spatial Gridding of 3D Data Volume Structure of Comprehensive Geophysical Exploration

Table 3-8 Strata Attribute List of Coordinate Point A(x, y, z) in Underground Space