Establishment method of beach-bar sandstone microfacies identification model
A beach-bar sandstone and pattern recognition technology, applied in the field of oil exploration and development of oil and gas reservoir identification, can solve problems such as narrow application range and achieve the effect of large changes in physical properties
Active Publication Date: 2016-05-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The expert system used in this method is empirical, and it is feasible for the identification of sedimentary microfacies in low-permeability siltstone reservoirs, but the scope of application is narrow
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Embodiment 1
[0072] 1. Establish a beach-bar sandstone microfacies recognition model
[0073] (1) Obtain the lithology identification parameters of model logging
[0074] Set the primary logging lithology identification parameters according to the logging curve of a certain block, and identify the logging lithology based on the primary logging lithology identification parameters, and then compare whether the logging lithology is consistent with the logging lithology, and logging in When the lithology is inconsistent with the logging lithology, repeat the above steps until the logging lithology is consistent with the logging lithology, thereby obtaining the model logging lithology identification parameters.
[0075] (2) Establish qualitative standard microphase library and quantitative standard microphase library
[0076] According to logging curves, model logging lithology parameters and / or logging lithology, cluster analysis is used to jointly divide the small layers in the microfacies interval. ...
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The invention relates to a beach bar sandstone microfacies recognition mode establishment method and the application of a beach bar sandstone microfacies recognition mode in microfacies recognition. The beach bar sandstone microfacies recognition mode establishment method is a method that a well log combined with geological logging data recognizes the sedimentary microfacies, firstly, lithological characters are recognized accurately according to the well log, then the well log and the lithological characters are combined to divide a small layer in a geologic microfacies interval, a curve numerical value and a form numerical value of the small layer are extracted, finally the beach bar sandstone sedimentary microfacies is divided accurately according to the curve numerical value, the form numerical value and the lithological characters, and then a beach bar sandstone sedimentary microfacies modeled recognition standard library and the beach bar sandstone microfacies recognition mode are established. The beach bar sandstone microfacies recognition mode is adopted, the beach bar sandstone sedimentary microfacies modeled recognition standard library is based on, and the curve numerical value and the form numerical value of the well logging are combined, so that the beach bar sandstone sedimentary microfacies is recognized accurately. The beach bar sandstone microfacies recognition mode establishment method can be suitable for all beach bar sandstone sedimentary microfacies division, and can provide a criterion for reservoir properties and oil content.
Description
Technical field [0001] The invention belongs to the technical field of petroleum exploration and development oil and gas reservoir identification, and relates to a method for establishing beach bar sandstone microfacies recognition mode, and specifically, relates to a beach bar sandstone microfacies recognition model based on a beach bar sandstone standard microfacies library Establish method. Background technique [0002] The beach-bar facies strata can be divided into littoral-shallow lacustrine facies clastic beach bars and marine carbonate reef beaches from the sedimentary types. The littoral-shallow lake facies clastic beach bars are called beach bar sandstones. [0003] Beach-bar sandstone is characterized by large physical changes and strong heterogeneity. Most of the beach-bar sandstones present thin interbeds, and some are even tight layers, making oil and gas exploration difficult. The distribution law of oil and gas has a certain relationship with sedimentary microfacie...
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IPC IPC(8): E21B49/00E21B47/00
Inventor 廖东良赵文杰陆黄生刘江涛杨明清王卫王志战吴海燕张元春
Owner CHINA PETROLEUM & CHEM CORP