Research method for stratum paleofluid salinity evolution history

Abstract

The invention provides a research method for stratum paleofluid salinity evolution history. The research method includes steps of S1, judging stratum rock cement sequences and screening samples with developed multi-period cement and abundant stored fluid inclusion; S2, selecting the fluid inclusion with different sequences and carrying out homogenous temperature and salinity tests to obtain a plurality of homogenous temperature and salinity data; S3, combining the homogenous temperature and salinity data with burial history, determining corresponding relations between earth temperature evolution and geological time and drawing salinity trend lines varied with the geological time according to the obtained homogenous temperature and salinity data of the multiple pieces of fluid inclusion soas to obtain the paleofluid salinity evolution history. The research method for the paleofluid salinity evolution history has the advantages that the research method is easy to implement, the continuous paleofluid salinity evolution history can be established by the aid of the research method, and relational chart plates with double horizontal coordinates which are the temperatures and the geological time and vertical coordinates which are salinity are proposed and are used for depicting the paleofluid salinity evolution history.

Description

technical field [0001] The invention relates to the field of oil and gas geological exploration, in particular to a research method for the evolution history of formation ancient fluid salinity. Background technique [0002] In petroleum basins, formation paleofluids often control tectonic activities and reservoir diagenesis, and play an important role in the formation and evolution of reservoirs and the process of hydrocarbon accumulation. At present, the research on the characteristics of formation paleofluids mainly adopts analysis methods such as inclusions, elements, and isotopes. Among them, the uniform temperature and salinity characteristics of inclusions are the key points in the study of paleofluids. is of great significance. In terms of the characterization of the salinity evolution history of paleofluids, previous studies have firstly measured the temperature and salt of multiple inclusions, and then analyzed the formation geological time of each inclusion accor...

AI Technical Summary

Problems solved by technology

This research method is difficult to establish a continuous paleo-fluid salinity evolution history, and it is necessary to obtain the formation time of each inclusion separately in combination with the burial history, which is cumbersome to operate and requires a lot of time and energy to realize.

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