Methodology and Results of Dynamic and Thermodynamic Simulation for Oil-Cracked Gas Pool of Puguang
Received date: 2010-02-08
Revised date: 2010-03-18
Online published: 2010-04-10
Based on data from kinetic experiment of oil-cracked gas, we designed the multi\|interval simulation of hydrocarbon accumulation and setup the thermodynamic model for overpressure\|induced fluid leakage and hydrostatic pressure balance and re-seal in this paper.By means of PVTsim software, we simulated fluid pressure curves of Puguang gas pool at different geological stages and discussed influence of fluid pressure on loss and storage of hydrocarbon reservoir.The simulation and calculation results inferred as follows: fluid pressure in oil pool was 25.2-49.8 MPa at 175-157Ma, and 54.6-150.64 MPa at 154-142 Ma in gas and oil pool; then when pressure coefficient was more than 2.4, fluid was leaked about 22.89% volume of hydrocarbon reservoir as far as equilibrium pressure for hydrostatic pressure and re-seal arrived at 62.13 MPa.At wet gas cracking stage (about 41-132 Ma), fluid pressure increased from 68.2 MPa to 170.9 MPa and pressure coefficient was more than 2.4, fluid was leaked again about 32.7% until equilibrium pressure for hydrostatic pressure and re-seal became 70.1 MPa.At 130-96 Ma, the gas pool was buried further, the temperature increased, associated with few amount of crude-cracked gas, the fluid pressure was increased to 86.62 MPa.The pressure for gas reservoir decreased to 56.9-61.0 MPa, due to basin uplift and temperature decrease since 90 Ma to present.The accumulative leakage of fluid was about 50.33% and storage was about 49.67% due to overpressure as mentioned above.The result of overpressure fluid simulated by PVTsim software has been proved by discovery of high density methane inclusions showing trapping pressure up to 155-165 MPa in reservoir samples.The simulation of pressure evolution in oil\|cracked gas pool was also similar to the measured PVT data for Puguang gas reservoir.
LIU De-Han, XIAO Xian-Ming, TIAN Hui, SHEN Jia-Gui . Methodology and Results of Dynamic and Thermodynamic Simulation for Oil-Cracked Gas Pool of Puguang[J]. Natural Gas Geoscience, 2010 , 21(2) : 175 -185 . DOI: 10.11764/j.issn.1672-1926.2010.02.175
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