Age determining method for curtain fluid movement history under low temperature background condition (0 to 60 DEG C)

Abstract

The invention relates to an age determining method for curtain fluid movement history under a low temperature background condition (0 to 60 DEG C). The age determining method comprises the following steps: step 100: measuring the temperature of an existing conducting passage; step 200: selecting apatite mineral from a conducting system based on the measured temperature; step 300: performing a fission track chronology test on the selected apatite; step 400: analyzing the thermal history overlaying process in the conducting system based on the test result; step 500, analyzing the fluid active stage and the age based on the analyzing result. Compared with the conventional type of the age determining methods, the age determining method provided by the invention is higher in precision and resolution, cannot be limited by authigenic mineral formed by fluid movement, overcomes the non-uniform catching problem of the fluid, expands the fluid research object, provides various temperature limitations for fluid movement history, and objectively provides possibility for distinguishing fluid movement in various curtains and various stages.

Description

technical field [0001] The patent of the present invention relates to a dating method of fluid episodic fluid activity history, in particular, relates to a dating method of fluid episodic fluid activity history under low temperature background conditions (0-60°C). Background technique [0002] There are two flow modes of subsurface fluid, steady state and unsteady state. Take the article "New Development of Petroleum Non-Darcy Seepage" published in "Petroleum Drilling and Production Technology" Volume 25, Issue 5, Page 40-42 in 2003 Model" as an example, it is considered that steady flow refers to a continuous seepage process, and the parameters of the fluid do not change with time, so the migration of fluid can be described by Darcy's law. Corresponding to it is unsteady-state fluid activity, which refers to the flow process in which underground fluid suddenly starts to flow rapidly and ends in a short period of time. Various parameters of the fluid change with time, usuall...

AI Technical Summary

Problems solved by technology

Wan Junwei and others emphasized the method of using trace elements or rare gas isotopes in fluids for dating in "The Theory and Practice of Isotope Hydrology" published by China University of Geosciences Press. The precondition is that "Fluid is in a closed system", and the frequent fluid mixing of overpressure fluid breaks the relatively closed environment in different fluid dynamic systems, leading to the failure of the isotope dating method using trace components and rare gases in the fluid

[0012] In summary, existing techniques cannot be applied to accurate dating of episodic fluid activity histories of overpressured fluids

The reason is: the fluid flow rate of the episodic fluid activity driven by overpressure is large and the duration is very short; the overpressure fluid generally manifests as multi-phase and multi-episode activities, and the multi-phase and multi-episode fluid activities will lead to multiple authigenic minerals. period or inherited development, the age of authigenic minerals reflects the comprehensive age of multi-episode fluid activities, but cannot distinguish the age of each episode of fluid activity; fluids with overpressure fluid episodic activities generally accompany abnormally high and high pressure, after entering the overlying relatively low-temperature and low-pressure formation, a strong boiling effect will occur, resulting in the formation of fluid inclusions (boiling inclusions) captured by authigenic minerals that cannot represent the actual temperature and pressure conditions for fluid formation; overpressure fluid Frequent fluid mixing breaks the relatively closed environment in different fluid dynamic systems, leading to the failure of dating methods using trace components and noble gas isotopes in fluids

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