Communicative fragments and contours of utterance as speech genre constituents

The article attempts to empirically verify the assumption that the texts of a certain sphere of knowledge and subject area are produced on the basis of a relatively stable potential of ready-to-use interrelated language, speech and textual means. Some reproductive speech units of Russian and English texts in hydrogeology are considered in terms of B. M. Gasparov`s usage-oriented theory. These regularly used language units rendering the typical meanings are described by example of two communicative-cognitive actions; the latter form a speech genre of scientific discourse. Regularities of systemic organization of the specialized scientific discourse are revealed.