Method for representation and factor recognition of common carbonate rock diagenesis fabric features
A carbonate rock and fabric technology, which is used in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of multiple solutions of single geochemical data and complex structural components of carbonate rocks. , to achieve the effect of reliable identification, reliable conclusion and accurate interpretation
Active Publication Date: 2014-10-01
PETROCHINA CO LTD
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[0004] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a method for characterizing and identifying the origin of common diagenetic fabrics of carbonate rocks, aiming at the fact that the structural components of carbonate rocks are complex and a single geochemical data has multiple solutions. Problem, by micro-sampling the diagenetic fabric in carbonate rocks and performing various geochemical analyzes to realize the identification of the characterization and origin (diagenetic environment) of common diagenetic fabrics in carbonate rocks
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[0042] This example provides a method for characterization and genetic identification of common diagenetic fabrics of carbonate rocks, which is to perform characterization and genetic identification of common diagenetic fabrics on the reef limestone of the Permian Changxing Formation in the Longgang area of the Sichuan Basin. Specifically include the following steps (the process is as follows image 3 shown):
[0043] Step 1: Carry out purposeful sampling after core observation and description (the content of core observation and description is shown in Table 2), the sample is not smaller than 2cm×2cm×5cm, and the sample is photographed, Figure 1a This is the physical picture of a typical reef limestone sample. Two types of calcite cements can be seen in the sample by naked eye observation, radial axis-shaped calcite (arrow) and massive spargy calcite (BC) filling along the framework pores. Grind No. I flakes according to the requirements of table 1;
[0044] Step 2: Obser...
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Abstract
The invention relates to a method for representation and factor recognition of common carbonate rock diagenesis fabric features. The method includes the following steps that rock cores are observed, sampled and flaked; the diagenesis fabric types and periods of samples are determined under a microscope, and a petrology chart is formed; single-period diagenesis fabric is sampled or flakes are ground; multiple kinds of geochemical analysis is conducted on the diagenesis fabric, and then geochemical data are generated; the geochemical data are collected, a chart is drawn according to the data, and a geochemical chart is formed; based on the geological backgrounds of the samples, the petrology chart and the geochemical chart of the samples are comprehensively analyzed, and then the factors of the samples are reasonably explained. According to the method, the single-period diagenesis fabric serves as an experimental analysis unit, multiple kinds of experimental analysis is conducted on the single-period diagenesis fabric, and the method has the advantages that blindness of traditional total rock analysis is avoided, the purpose that carbonate rock diagenesis is objectively represented is achieved, and the result obtained based on petrology data and multiple geochemical data is more reliable.
Description
technical field [0001] The invention relates to a characteristic characterization and genetic identification method of common diagenetic fabrics of carbonate rocks, belonging to the technical field of rock analysis. Background technique [0002] The diagenetic environment of carbonate rocks is closely related to the formation and development of reservoirs, and the identification of diagenetic environments is of great significance to the evaluation and prediction of carbonate rock reservoirs. At present, there is no mature carbonate rock diagenetic environment identification technology at home and abroad. For many years, people have mainly interpreted carbonate rock diagenetic environment based on petrological and geochemical methods. This is also the only way to solve this problem. However, the traditional There are disadvantages in practical application of petrological and geochemical methods. First, due to the ancient age of carbonate rocks in my country, the characterist...
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Login to view more IPC IPC(8): G01N21/84G01N23/20G01N23/22G01N1/06
Inventor 沈安江寿建峰潘立银张杰乔占峰郑剑锋郑兴平王永生秦玉娟胡安平陆俊明王小芳
Owner PETROCHINA CO LTD
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