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The list describes the layers encountered in their characteristic form. This includes information on appearance, texture and consistency, but also on special features such as odour, inclusions or differences in colour. Equally indispensable is the depth information, which defines the exact boundaries between the layers. This creates a continuous visualisation of the subsurface that remains comprehensible regardless of personal impressions.

There are many possible applications for the stratigraphic log. In civil engineering, it serves as a basis for assessing bearing capacity, groundwater conditions or possible subsidence. For environmental assessments, it provides information on the permeability and stratification of the soil, which can be decisive for the assessment of contaminated sites or groundwater movements. In geological research, on the other hand, it provides material for reconstructing historical deposits and developments.

A precise layer catalogue gives the drilling documentation its true significance. It provides a clear view of the subsurface, reduces uncertainties and creates confidence in further analyses. This makes it a key tool that plays a decisive role in the success of planning and projects.

Standards are essential to make a strata catalogue consistent and comparable. This includes DIN 4022,, which describes and standardises the approach to soils and rock. It is supplemented by DIN 4023, which is closely linked to the visualisation of layer sequences in the drilling profile. At international level, ISO 14688 ensures standardised classification and terminology. Together, these standards create the basis for transparent, technically correct and supra-regionally comprehensible documentation of drilling results.

A drilling profile is created in the form of a vertical section that depicts the layer sequence of the borehole. Typical features such as hatching, colours or symbols are used to differentiate between the various materials. Depth marks make it clear where a layer begins and ends so that the geological situation is reproduced exactly. This combination of graphic and metric elements enables quick orientation.

In practical terms, the drilling profile facilitates communication between experts. Civil engineers, geologists and experts can use the illustration to discuss what risks exist and what measures are required. The illustration is also helpful for clients or authorities, as it conveys complex geological conditions in an understandable form. The drilling profile thus becomes a link between technical accuracy and clear communication.

The drilling profile is also valuable from a scientific point of view. It provides data that can be used to analyse geological processes or to reconstruct the development of a region. By comparing several borehole profiles, it is possible to recognise large-scale structures and correlations that are not so obvious in pure text records. This makes it an important basis for research and teaching.

The standardised creation of drilling profiles is defined in standards. Particularly relevant are DIN 4023,, which regulates the graphical representation of drilling profiles, and DIN 4022,, which specifies the description of soil and rock materials. In addition, ISO 14688 is used, which contains internationally recognised rules for the classification of soils. These standards ensure that drilling profiles remain comparable regardless of project and region and can be used across disciplines.

The drilling log contains a description of the equipment and methods used, information on the start and end of drilling and the time schedule. Special incidents such as technical faults, drilling obstacles or unexpected geological findings are also recorded. This is supplemented by information on drilling depth, drilling progress and the aids used in each case, such as flushing fluids or pipework. The result is a complete and structured record that allows precise reconstruction of the borehole.

The practical importance of a drilling log lies primarily in its function as proof. It serves clients and authorities as proof of proper execution and enables experts to make a well-founded assessment of the results. The log can also be used to prepare technical decisions, assess subsoil risks and track cost developments. In the event of a dispute, it represents legally relevant documentation that safeguards the quality and progress of the drilling.

The drilling log also has its value in research and education. It documents not only the immediate results, but also the conditions under which a borehole was drilled. This information is indispensable for correctly classifying geological data and making it comparable. In this way, the drilling log makes a significant contribution to ensuring the transparency and traceability of geological investigations.

Established standards and guidelines exist for the creation and structuring of drilling logs. Particularly relevant are DIN 4021 (drilling, drilling equipment, drilling methods, drilling logs), which provide specifications for systematic documentation. In addition, regulations such as DIN 4022 (Soil and rock characterisation) are used to ensure a uniform description of geological findings. International standards such as ISO 22475 (Geotechnical exploration and investigation - Sampling methods and groundwater measurements) also contain specifications that can be used in connection with drilling logs.