Method for generating dolomite reservoir geochemical plate

Abstract

The invention provides a method for generating a dolomite reservoir geochemical plate. The method comprises the following steps: selecting a dolomite sample according to a core structure, and preparing the selected dolomite sample into sample pieces; carrying out electronic probe microanalysis, laser carbon oxygen isotope analysis, strontium isotope analysis and rare earth element analysis on thesample pieces to generate analysis data; determining the genetic type of the dolomite reservoir according to the sample pieces; and generating a geochemical plate according to the analysis data and the genetic type. By utilizing the dolomite reservoir geochemical plate in the invention, the genetic type of the dolomite reservoir can be accurately and rapidly identified; compared with the traditional method, the genesis of the reservoir is more accurate and reliable, and the reservoir formation mechanism and master control factors can be known deeply.

Description

technical field [0001] The present invention relates to the research technology of reservoir geology in petroleum and natural gas geological exploration, in particular to the research technology of dolomite reservoir, and specifically relates to a method for generating a geochemical plate of dolomite reservoir. Background technique [0002] Dolomite is a very important oil and gas reservoir. Among the carbonate reservoirs in North America, dolomite reservoirs account for more than 80%, and the global proportion exceeds 50% (Zenger et al., 1980). In recent years, the exploration of marine carbonate rocks in China has also made continuous breakthroughs. In particular, many large oil and gas fields have been discovered in dolomite reservoirs, revealing that dolomite reservoirs have great potential. Dolomite accounts for a very large proportion of carbonate rocks. Dolomite developed from the Sinian to the Lower Ordovician is as thick as 2,000 meters. However, due to the late sta...

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Problems solved by technology

The traditional classification of dolomite reservoir types is mainly devoted to the description of characteristics, dividing dolomite into microcrystalline, powder crystal, fine crystal, coarse crystal, etc. The advantage of this method is that it can objectively describe the characteristics of the reservoir, but the sampling for geochemical analysis is carried out on the core scale, and the sample may contain multiple fabrics, and each fabric The causes of formation of dolomite reservoirs may be different, and it is impossible to guarantee that all experimental analyzes are combined for the same fabric. This is not conducive to a clear understanding of the genetic mechanism of dolomite reservoirs, and the formation environment revealed is not clear enough. Therefore, the genesis of dolomite reservoirs and Insufficient power to reveal the law of developmental distribution

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