有限空间温压共控热模拟油气产物地球化学特征

doi:10.11764/j.issn.1672-1926.2019.07.014

Abstract

Abstract:

Hydrocarbon generation reaction is comprehensively affected by temperature, static pressure, and pore pressure of strata in the limited pore space of the source rocks, and the thermal simulation experiment is a useful method to model hydrocarbon generation of organic matter. However, many thermal simulation experiments are limited by instrumentation, and only consider the effect of temperature, which is obviously different from the actual geological conditions. Here, the Hetaoyuan Formation mudstone of Well B215 in Biyang Depression is selected as samples to conduct simulation experiment of temperature and pressure co-controlling in finite space and that of only temperature-controlled, respectively. The oil and gas products under the two experiments have been analyzed by group composition, isotope, GC, GC-MS. The results indicate that: (1) The saturated hydrocarbons from residual oil can be preserved at a higher evolution stage under the condition of temperature and pressure co-control in finite space; (2) Under the same simulation temperature, the parameters Pr/Ph, Pr/C₁₇ of the residual oil saturated hydrocarbons are higher in temperature and pressure co-control thermal simulation experiment, while the parameters C₂₉ 20S/(20S+20R) and C₂₉ ββ/（αα+ββ） etc. of residual oil steroids and terpenoids are smaller than those of temperature-controlled experiment; (3) The value of carbon isotope δ¹³C of hydrocarbon gas under the thermal simulation of temperature and pressure co-control in finite space is higher than that of temperature-controlled thermal simulation. The above phenomena are mainly caused by the existence of high-pressure pore fluid, which delays the process of thermal maturation and crude oil cracking under the simulation experiment of temperature and pressure co-control in finite space. Therefore, the potential overpressure and formation water in the study area should be considered when conducting thermal simulation experiment, since it directly affects the geological applicability of the simulation results.

Key words: Temperature and pressure co-control in finite space, Temperature-controlled, Thermal simulation, residual oil, Geochemistry

CLC Number:

TE122.1⁺13

Han ZHAO, Zhong-liang MA, Lun-ju ZHENG, Jing-qiang TAN, Qun LI, Zhang-hu WANG, Chuan-xiang NING. Geochemical characteristics of hydrocarbon products under thermal simulation of temperature and pressure co-control in finite space[J].Natural Gas Geoscience, 2020, 31(1): 73-83.

Figures/Tables 9

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序号	埋深/m	温度/℃	有限空间温压共控热模拟				温控热模拟
序号	埋深/m	温度/℃	静岩压力/MPa	最低地层流体压力/MPa	最高地层流体压力/MPa	Ro /%	加水量/mL	实际体系压力/MPa	R_O /%
1	1 500	275	34.50	15.00	22.50	0.35	6.0	4.10	0.34
2	1 700	300	39.10	17.00	25.50	0.41	6.0	6.60	0.39
3	2 000	325	46.00	20.00	30.00	0.53	6.0	9.80	0.48
4	2 261	350	52.00	22.61	33.92	0.81	6.0	11.40	0.92
5	2 400	360	55.20	24.00	36.00	0.98	6.0	14.20	1.01
6	2 500	370	57.50	25.00	37.50	1.42	6.0	15.10	1.45
7	2 800	380	64.40	28.00	42.00	1.67	6.0	15.90	1.61
8	3 000	400	69.00	30.00	45.00	2.06	6.0	18.30	2.04
9	4 000	425	92.00	40.00	60.00	2.40	6.0	22.20	2.61
10	5 000	450	115.00	50.00	75.00	2.76	6.0	23.10	3.10
11	6 500	500	149.50	65.00	97.50	3.18	6.0	34.70	3.38

Geochemical characteristics of hydrocarbon products under thermal simulation of temperature and pressure co-control in finite space

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