Sedimentary facies quantitative recognition method based on lithologic statistics

Abstract

The invention discloses a sedimentary facies quantitative recognition method based on lithologic statistics. The method comprises the following steps: data collection: collecting the lithologic logging data of an exploratory well in a work area and known sedimentary facies data; data processing: taking a continuously uninterrupted stratum section corresponding to one sedimentary facies type on a single well as a calculation unit, eliminating the calculation units with the thicknesses of smaller than 20 m, eliminating ineffective rock stratums in each calculation unit, and dividing remaining rock stratums as two types of sandstone and mud rock; parameter calculation: calculating the two parameters, such as sandstone frequency and sandy ground ratio, of each calculation unit respectively; and establishment of a sedimentary facies quantitative recognition plate: according to the parameter calculation result of each calculation unit, carrying out cultellation on a sandstone frequency-sandyground ratio intersection map, and then drawing different sedimentary facies types of recognition areas according to the sedimentary facies types and cultellation positions of the calculation units.According to the method, the work efficiency and accuracy rate of sedimentary facies recognition work are improved greatly; and the method has the advantages of high speed, low cost, high efficiency and little influence on subjective interference.

Description

technical field [0001] The invention relates to a method for quantitative identification of sedimentary facies in the petroleum exploration industry. In particular, it relates to a quantitative identification method of sedimentary facies based on lithological statistics. Background technique [0002] Sedimentary facies analysis is the basic geological work in the field of oil and gas exploration, and it is also an indispensable part of the work for reservoir prediction research. In the current research work, we have mastered the use of sediment analysis method, paleoenvironment restoration method, logging facies analysis method, seismic facies analysis method and other technical methods to divide sedimentary system types and identify sedimentary subfacies and microfacies . These research methods are based on typical facies markers, mainly rely on a large number of analytical tests, core observations and high-quality seismic data, or make subjective judgments based on the g...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a sedimentary facies quantitative identification method based on lithology statistics that can effectively solve the problems of strong data dependence, slow timeliness, and large subjective influence factors in the identification of lower sedimentary facies

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