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All soil types and rock layers encountered are described in detail in the layer catalogue. This includes colour, grain size, consistency, moisture or strength as well as special features such as organic inclusions or degrees of weathering. The depth information that characterises the beginning and end of the respective layer is also noted. This information enables the geological situation to be precisely assigned to the drilling depths. In this way, a continuous record is created that can later be understood by third parties without knowledge of the borehole.

A carefully compiled strata catalogue is indispensable for construction projects in which soil conditions play a central role. Engineers and geologists use it to make decisions on foundations, waterproofing or the use of materials. In addition, it has an important function in environmental investigations, as pollutant displacements or groundwater flow directions can be better assessed. It is also a valuable tool in scientific research, for example in the reconstruction of geological time periods.

The stratigraphic log thus fulfils the task of depicting complex geological relationships in a clear and standardised way. It is not only a technical document, but also a means of visualising the subsurface in a transparent and comprehensible manner. Its quality is decisive for the informative value of all further analyses based on this data.

The preparation of strata catalogues is regulated in various standards in order to ensure uniformity and comparability. DIN 4022 (soil and rock characterisation), which ensures a systematic description of strata, provides essential specifications. DIN 4023 (drilling profile) also applies, as the strata catalogue and drilling profile are closely linked in terms of content. ISO 14688, which standardises the naming and classification of soils, is also important at international level. These standards form the basis for professional and standardised documentation.

The graphical representation is a vertical section through the borehole. Different soil types and rocks are identified by standardised colours, patterns or symbols. In addition, depth information is used to mark the beginning and end of a layer and establish the connection to the actual borehole. This creates a vivid image that concisely complements the text information and in many cases even makes it easier to understand.

In practice, the drilling profile offers numerous advantages. Engineers can use the sequence of layers to assess which construction methods are suitable and where special precautions are required. It also has an important function for environmental assessments, as the permeability of soil layers or the location of groundwater can be seen directly. Clients in turn receive a compact and easily comprehensible overview with the drilling profile.

In addition to its immediate practical use, the drilling profile also plays an important role in research. It provides data that can be used for geological reconstructions and comparative analyses. It thus contributes to scientific documentation and creates a solid basis for understanding long-term developments in the subsurface. Its value therefore lies equally in its technical and scientific application.

There are clear standards to ensure that drilling profiles are comprehensible and comparable everywhere. Particularly relevant are DIN 4023,, which sets out specifications for the presentation of drilling profiles, and DIN 4022,, which regulates the labelling of soil and rock materials. At international level, ISO 14688 supplements these standards by specifying standardised rules for naming and classifying soils. These standards ensure uniformity and guarantee that drilling profiles can be used across regions and disciplines.

The typical contents of a drilling log include details of the drilling equipment, the method used and the start and end times of the drilling. The depth reached, the drilling speed and special incidents such as obstacles or technical problems are also documented. In addition, information on auxiliary equipment such as flushing, pipework or accessories used is also included. This information provides a complete basis for a precise understanding of the drilling conditions at a later date.

In practice, the drilling log fulfils various tasks. On the one hand, it serves as quality assurance and can be used as legal proof if questions arise regarding proper execution. On the other hand, it provides engineers, geologists and clients with the basis for decisions on construction methods, safety measures or cost planning. Thanks to its clear structure, it also supports communication between all parties involved and thus contributes to the efficiency of a project.

The drilling log also has a firm place in scientific contexts. It provides comprehensible documentation that is indispensable for comparing different investigations. It also creates transparency, as it records not only the results but also the process by which they were obtained. In this way, it contributes to making geological data permanently usable and verifiable.

The preparation of drilling logs is regulated by standards to ensure standardisation and comparability. Of particular relevance is DIN 4021,, which contains clear specifications for the logging of boreholes. In addition, DIN 4022, is used to standardise the description of soil and rock materials. At international level, ISO 22475 is also used, which standardises geotechnical exploration, sampling and groundwater measurements. These standards ensure that drilling logs are technically robust and internationally understandable.