Identification method of deposition and diagenetic integrated phase of clastic rocks

Abstract

The invention discloses an identification method of the deposition and diagenetic integrated phase of clastic rocks. The method comprises the steps of 1) defining the deposition and diagenetic integrated phase based on a rock core; and 2) identifying the deposition and diagenetic integrated phase by utilizing a logging curve. The invention brings forward the concept of the deposition and diagenetic integrated phase for the first time, and influence of original decomposition and post-stage diagenesis on reservoir physical properties and logging response are taken into consideration; the classification standard of the diagenetic phase in the deposition and diagenetic integrated phase is re-defined, the principle of classifying the diagenetic phase according to the absolute values of compacting, cementing and corroding effects to the reservoir physical properties is provided for the first time, and thus, classification of the diagenetic phase is more accurate; and the logging identification method, in which crossplot identification is carried out on the basis of Bayesian discrimination, of the deposition and diagenetic integrated phase is provided for the first time, and the correct rate of logging identification is obviously improved.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration, in particular to a clastic sedimentary diagenetic comprehensive facies identification method. Background technique [0002] Lithofacies refers to the rock or rock combination formed in a certain depositional environment, which is the material manifestation of the original deposition. Diagenetic facies refers to the current state of the original sediment after undergoing diagenesis such as dissolution, cementation and compaction, and it is a comprehensive expression of the type and intensity of diagenesis. Reservoir physical properties are controlled by reservoir lithofacies on the one hand, and different lithofacies have different properties such as grain structure, composition, and structure, resulting in different physical properties; on the other hand, controlled by reservoir diagenetic facies, the same lithofacies have different diagenetic Reservoirs of differen...

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Problems solved by technology

However, this division method has its own limitations: (1) The denominators of the formulas for calculating the apparent compaction rate, apparent cementation rate, and apparent dissolution rate are different, and the use of these three parameters to classify diagenetic facies often leads to results that differ from the actual ones. (2) The apparent compaction rate, apparent cementation rate and apparent dissolution rate have no corresponding relationship with their contribution to reservoir physical properties

At present, the logging identification of clastic rock reservoirs only considers the influence of a single lithofacies or diagenetic facies, without comprehensive consideration of the two, and the logging identification of lithofacies or diagenetic facies is only A single well logging identification method is used for discrimination, but multiple well logging identification methods are not combined for comprehensive identification

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