The article deals with a pressing problem whole drilling horizontal wells - the presence of a non-measurement zone with downhole logging tools. There is a high probability of leaving the target interval when drilling horizontal wells, and a decrease in a flow rate. In these cases, the value of geochemical research conducted by a mud logging station increases. Today, in mud logging, there are several methods for studying cuttings, such as description of the penetration section lithology, determination of the density and carbonate content of rocks, and the type saturation using the LBA method. All these methods were developed more than 50 years ago, have not been improved to three days, and do not meet modern tasks. Searching for methods to increase the information content of sludge led to the technology of microbiota DNA sequencing. During the drilling process, along with drill cuttings or core, microorganisms inhabiting the formation are brought to the surface. With the development of new, and relatively inexpensive, quantitative description tools (DNA sequencing), detailed identification of formation microorganisms and determination of the conditions of their live and feed (oil or gas) have become possible. Thus, it became possible to use microorganisms as natural DNA markers to determine the zone and the type of reservoir saturation. The report describes potential areas for possible application of the technology in the process of well drilling and during subsequent well operation. The experience of using thigh technology at a field in the Russian Federation is also described.
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