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yi ji fan ying fang cheng de jin si jie ji qi zai you qi ding liang yu ce zhong de ying yong
Author(s): 
Pages: 99-112
Year: Issue:  2
Journal: Oil & Gas Geology

Keyword:  干酪根一级反应方程初次运移近似解定量预测方法速率因数碳质残渣地表温度油气预测时间间隔;
Abstract: The thermal evolution of the carbon atoms which can gradually trans-migrate from kerogen into bitumen and are called potential carbon or avail- able carbon by the author is considered as an unimolecular 1st-order re-action:V=-dB/dt=KB=aBexp(-E/RT ) (1)ln(B_p/B_0)=-sum from i=1 to p integral from (t_(i-1))~(t_i) K_idt=-sum from i=1 to p S_i (4)S_i=aΔt_i·exp(-E/RT_i) (T_i=const) (5)S_i=(1.95a Δt_i)/(ΔT_i){(T_i~2)/(E+3.07 T_i)e~(-E/RT_i)-(T_(i-1)~2)/(E+3.07 T_(i-1))e~(-E/RT_(i-1))}(T(?)const) (8)The cracking of liquid bitumen(“crude oil”)may be described byfollowing equations:V~*=dq/dt=K~*y=a~*y·exp((-E~*)/(RT)) (10)V~*=K~*(1-α_i-q_(i-1)-0.5 V_(i-1)~*Δt_i)/(1+0.5 K~*Δt_i) (16)Δq_i=0.5(V_i~*+V_(i-1)~*) Δt_i (15)q_i=q_(i-1)+Δq_i (13)y_i=1-α_i-q_i (11)Herein the symbol y shows the carbon of liquid bitumen in source rock,q is the carbon in gas and carbonic residue,a=B/B_0 is called residualratio of available carbon,a is ca. 3.292×10~7/m.y.,E is ca.15,950 cal/mol,a~* is ca.8×10~(25)/m.y.,E~* is ca.50,000 cal/mol.After putting them into practise,we found out that the equations pro-posed in this paper are helpful in quantitative prediction of petroleum.
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