Distinction Between Oil Expulsion History and Gas Expulsion History |
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| Authors: | Bojiang Fan Xiongqi Pang Xiaoming Zhang Jian Zhang |
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| Institution: | (1) Research Center of Basin and Reservoir, China University of Petroleum, Beijing, 102249, People’s Republic of China;(2) State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, No. 18, Fuxue Road, Changping district, Beijing, 102249, People’s Republic of China;(3) Jidong Oil Company, Petrochina, Tangshan, 063004, Hebei, People’s Republic of China |
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| Abstract: | The process of organic matter transformation into oil and gas is also a balance process of hydrocarbon transformation. This
article probes to distinguish the oil expulsion history from gas expulsion history based on the hydrocarbon generation, hydrocarbon
residual, and hydrocarbon expulsion processes of the source rocks. In this method, the first step is to study the hydrocarbon
expulsion rate by means of hydrocarbon generation potential method; the second step is to study the oil generation rate by
means of the heating–pressuring experiment method; the third step is to study the oil residual rate by means of the mathematical
method. The difference between the values of oil generation rate and oil residual rate is defined as the oil expulsion rate,
while that between the values of hydrocarbon expulsion rate and the gas expulsion rate is defined as the gas expulsion rate.
Then, combined with the geological parameters of source rocks, the oil and gas expulsion history can be obtained. This study
on Es1 Source rocks, Nanpu Sag, Bohai Bay Basin, China shows that the primary expulsion period of Es1 source rocks is Guantao–Minghuazhen period. |
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