Trapping pressure estimation of single gaseous inclusion using PVT simulation and its preliminary application in NE Sichuan, China. (January 2018)

• Record Type: Journal Article
• Authors: Wang, Yunpeng; Liao, Lingling; Geng, Ansong; Liu, Dehan
• Is Part Of: Marine and petroleum geology. Volume 89:Part 1(2018)
• Page Start: 225
• Page End: 231
• Publication Date: 2018-01
• Subjects: Trapping pressure -- Inclusion -- Fluid connectivity -- Gas reservoir -- Sichuan basin; Submarine geology -- Periodicals; Petroleum -- Geology -- Periodicals; Géologie sous-marine -- Périodiques; Pétrole -- Géologie -- Périodiques; Petroleum -- Geology; Submarine geology; Periodicals; Electronic journals; 551.468
• DOI: 10.1016/j.marpetgeo.2017.02.028
• Languages: English
• ISSNs: 0264-8172

Abstract

Abstract: In this paper, we proposed an alternative way to estimate volumetric vapour: liquid ratio of gaseous or light-petroleum inclusions without fluorescence using regularly-shaped inclusions to estimate volumetric vapour: liquid ratios through geometric methods. The method was applied to the inclusions from the rock samples of the Lower Triassic Feixianguan and Jialingjiang Formations, NE Sichuan (China). The trapping pressures of inclusion fluids were calculated by integrating PVT simulation software, volumetric liquid: vapour ratios determined by the proposed method and homogenization temperatures measured by microthermometry. Fluid densities and gas-oil ratios (GOR) were also estimated. The estimated trapping pressures and temperatures are slightly lower for the Jialingjiang formation (29.69–31.33 MPa, 93.5–105.2 °C) than for the Feixianguan Formation (31.02–34.38 MPa, 98–148 °C), and the trapping time of the inclusions in the Jialingjiang Formation and Feixianguan Formation were estimated at about 173–170 Ma and 178-168 Ma, respectively. The distribution of high pressures correlates with the presence of pyro-bitumen in the reservoir rocks, suggesting the migrated fluid is derived mainly from the secondary cracking of oil. The modeled fluid density and GOR correspond to a typical light oil or condensate, suggesting an origin for the trapped hydrocarbons as an intermediate product in this process. Highlights: A way to estimate volumetric liquid:vapour ratio of inclusions without fluorescence. Estimate L:V ratio of regularly-shaped inclusions through geometric methods. The estimated trapping P/T are slightly different for two formations in NE Sichuan. Modeled inclusion fluids correspond to a light oil/condensate via cracking of oil to gas.