Well pattern mature region underground river course sand body quick identification method

Abstract

The invention relates to a well pattern mature region underground river course sand body quick identification method. The method includes the following steps that: 1) stratum division and comparison are performed, and an isochronal stratigraphic comparison framework is established; 2) the sand body thicknesses contour line maps of each stratum are drawn; 3) under the constraint of the isochronal stratigraphic comparison framework, sedimentary microfacies interpretation is carried out based on a well logging curve pattern and rock debris data; 4) a sedimentary microfacies database is established with single strata adopted as basic units; 5) with any single stratum adopted as a research object, river course sand body identification is performed on each well on by one; 6) after all the wellsof the single stratum which is adopted as the research object all participate in comparison, river course sand body identification is performed on the next stratum until the river course sand body identification of all the single strata is completed; and 7), the identification results of all the wells of any single stratum are projected onto the sand body thickness contour line map of the single stratum according to the coordinates of the locations of the wells, with the sand body thickness contour line map adopted as a constraint, identified underground river course sand bodies are subjectedto plane combination.

Description

technical field [0001] The invention relates to the field of geological research of oil and gas field reservoirs, in particular to a method for quickly discriminating underground channel sand bodies in well pattern mature areas. Background technique [0002] In the late stage of oil and gas field development, the well pattern is relatively mature, and the enhanced oil recovery technology based on the study of the remaining oil (gas) distribution is the most critical challenge for oil and gas geologists, and the basis of the study of the remaining oil (gas) distribution is the underground channel Identified as a fine description of the core reservoir. [0003] In the late stage of oil and gas field development, there are abundant data that can be used for fine reservoir description, including drilling, well logging, mud logging, and seismic data. ) distribution prediction and the adjustment of EOR measures have laid a solid foundation. [0004] However, it should be noted t...

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Problems solved by technology

[0010] General oil and gas fields have a large number of wells in the later stage of development, some as many as tens of thousands of wells, which further aggravates the tediousness of research work and low work efficiency

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