Method for establishing diagenetic paleo-fluid temperature correction map of marine carbonate rock reservoirs

Abstract

The invention discloses a method for establishing a diagenetic paleo-fluid temperature correction map of marine carbonate rock reservoirs. The method comprises: S1, selecting a plurality of carbonaterock samples according to core observation and analysis and processing the plurality of selected samples to obtain thin sheet and powder samples; S2, carrying out mineralogy analysis, fluid inclusionobservation, and cathodoluminescence observation on the thin sheet samples to obtain an analysis result, carrying out fluid inclusion homogenization temperature measurement on the thin sheet samples obtained in the S1, and carrying out carbon-oxygen coupled isotope determination on the powder samples; S3, processing and analyzing the homogenization temperature value and the carbon-oxygen coupled isotope temperature value by combining the analysis result in the S2; and S4, establishing a correction map of the fluid inclusion homogenization temperature and verifying the rationality and accuracyof the map. Therefore, the fluid inclusion homogenization temperature can be correct, thereby obtaining an accurate diagenetic paleo-fluid temperature.

Description

technical field [0001] The invention relates to the technical field of oil and gas geological exploration, in particular to a method for establishing a temperature correction plate for diagenetic paleofluids in marine carbonate reservoirs. Background technique [0002] In carbonate oil and gas reservoirs, complex water-rock reactions between diagenetic fluids and carbonate components lead to significant changes in pore space, thereby controlling the distribution of favorable reservoirs. Therefore, information exploration of diagenetic paleofluids has long important research topics. Among them, the temperature of diagenetic paleofluid is an important reference for analyzing the source and characteristics of paleofluid, and it is also an important research content of diagenesis of carbonate reservoirs, and plays an important role in the analysis of carbonate reservoirs. At present, the use of fluid inclusions for homogeneous temperature measurement is the mainstream method fo...

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Problems solved by technology

However, this method has certain limitations: the temperature obtained by using the fluid inclusion homogenization temperature measurement method is the temperature at which the gas and liquid phases begin to differentiate during the temperature and pressure drop process after the formation of carbonate mineral crystals, and this temperatures tend to be lower than the true paleofluid temperatures at which carbonate minerals formed

In some cases, the homogenization temperature of fluid inclusions can be used to approximate the paleofluid temperature when carbonate minerals were formed (such as estimating the burial depth when carbonate minerals were formed), but in the case where the temperature of diagenetic paleofluids needs to be accurately known However, (such as calculating the oxygen isotope composition of ancient fluids, tracing the source of fluids, etc.), using the homogenization temperature of fluid inclusions for calculation will lead to large errors in the analysis results

[0003] Although the coupled isotope testing technique can be used to analyze the temperature of paleofluids more accurately in recent years, this method requires high equipment precision, and the sample preparation is more demanding and costly, making it difficult to be widely used

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