Method for continuously explaining lithology of mixed fine-grained rock and modeling method of model thereof

Abstract

The invention discloses a method for continuously explaining lithology of mixed-accumulation fine-grained rock and a modeling method of a model thereof, which comprises the following steps of: firstly, selecting a continuous coring well section rock core in a research area according to geological conditions and research target requirements, systematically observing and describing rock core data ofthe continuous coring well section, and acquiring a rock core element continuous distribution curve of the continuous coring well section; an analyzing lithological characteristics corresponding to the core data of the continuous coring well section observed and described by the systm, and determining typical lithology of the research area; determining different element content values and differences of typical lithology of the research area, determining elements capable of continuously and quantitatively explaining the typical lithology of the research area, and defining the elements as sensitive elements; and in combination with the core element continuous distribution curve of the continuous coring well section, establishing a mixed fine-grained rock lithology interpretation model based on the content difference of sensitive elements, and carrying out lithology continuous interpretation by utilizing the model. The method solves the problems that an existing mixed fine-grained rocklithology distinguishing method is large in distinguishing difficulty in an oil field drilling site and not high in practicability.

Description

technical field [0001] The invention belongs to the technical field of rock type discrimination, in particular to a method for continuous interpretation of mixed fine-grained rock lithology and a modeling method for its model. Background technique [0002] Mixed deposition refers to the mixing of terrigenous clastics and carbonates in sedimentation, and is mainly divided into narrow and generalized mixed sediments. It also includes interbedded and interbedded deposits of terrigenous clastic rocks and carbonate rocks. In the 1980s, Mount proposed the concept of "mixed sediments" for the first time, and proposed four depositional modes: discontinuous mixing, phase mixing, in-situ mixing and source-site mixing. In the 1990s, Yang Chaoqing put forward the concept of "diamictite" and six characteristics of diamictite on this basis. Subsequently, scholars gradually carried out studies on mixed sedimentary models, diamictite classification, mixed sedimentary genesis mechanism and...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a modeling method for a continuous interpretation model of diastolic fine-grained rock lithology, so as to provide a continuous interpretation model of diamictic fine-grained rock lithology to solve the problem of existing diamictic fine-grained rock It is difficult and practical to discriminate the method in the oil field drilling site

[0007] Another purpose of the embodiments of the present invention is to provide a method for continuous interpretation of diacilized fine-grained rock lithology, so as to solve the problem of poor real-time discrimination of diacilminated fine-grained rock in existing methods for discriminating diacilized fine-grained rock Problems of oil and gas exploration and development speed and real-time drilling work efficiency

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