How to restore the paleo-temperature and pressure of a reservoir during geological history?May. 7,2022
The formation of oil reservoirs has experienced a long evolution process, and temperature and pressure are two key parameters that controlled the evolution process of oil and gas. Previous studies show that geological paleo-fluid samples (fluid inclusions) enclosed in mineral lattice defects or cavities preserve paleo-temperature and pressure information during reservoir formation. However, due to the small size, complex composition and varied types of fluid inclusions, the reconstruction of paleo-temperature and pressure is still a challenging task.
In a paper named “Reconstruction of paleo-temperature and pressure of oil reservoirs based on PVTx simulation: problems, strategies and case studies” by XI Binbin, JIANG Hong, XU Jin, et al. (Wuxi Research Institute of Petroleum Geology, PEPRIS, SINOPEC), the authors reviewed that current researches are not suitable to simulate the paleo-temperature and pressure of secondary oil reservoirs. In order to solve the problem, a new method taking the accompanied methane-bearing aqueous inclusions instead of oil inclusions to reconstruct the paleo-temperature and pressure was introduced. A new method for paleo-temperature and pressure reconstruction of methane-bearing aqueous inclusions was established by comprehensively using various methods such as laser Raman spectroscopy, inclusion cooling and heating stage, and computer programming. This method was successfully applied to reconstruct the paleo-temperature and pressure of methane-bearing aqueous inclusions in well SN 1 in the southern Shuntuoguole area of the Tarim Basin.
Relevant research results were published in “Petroleum Geology & Experiment”, Volume 43, Issue 5, 2021 (doi: 10.11781/sysydz202105886), and a bilingual version is now online (http://jtp.cnki.net/bilingual/detail/html/SYSD202105019).
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