Thermal Simulation Experiment for Hydrocarbon Generation: A Case Study of Jurassic Coal from the Southern Margin of Junggar Basin

doi:10.19657/j.geoscience.1000-8527.2021.159

Abstract

Abstract:

Gold tube-autoclave thermal simulation system was used to study the generation and evolution of oil and gas from the coal (Badaowan and Xishanyao formations)in the southern margin of Junggar Basin.It is of great significance for the oil-gas resource evaluation and source study in the southern basinal margin.Thermal simulation experiment of coal shows that the oil generation potential of the Badaowan Formation coal is significantly higher than that of the Xishanyao Formation coal.The maximum oil yield of Badaowan and Xishanyao Formation coal is 60.13-83.27 mg/g (R_o(vitrinite reflectance)=1.07%) and 27.14-62.14 mg/g (R_o=0.96%), respectively.The gaseous hydrocarbon yields of Badaowan and Xishanyao Formation coal are similar, both having high gas generation potential and wide gas generation window.At R_o=0.90%, coal starts to crack into gas.At R_o=1.07%-1.65%, coal is in the rapid moisture generation stage, and the gas yield is about 50% of the maximum gas yield.At R_o>1.65%, coal is in the stage of kerogen crack into dry gas.At R_o=3.60%, gas generation by coal is basically over, and the maximum gas yield of 92.23-141.26 mg/g.The thickness of Badaowan Formation coal seam in the Aika structural belt in the western part of the southern margin is 10-20 m, and R_o=~1.0%. The local coal is at the peak of oil generation, with the oil yield being 57.10-81.19 mg/g.Moreover, the organic carbon content of coal is high.Therefore, we considered that the local coal has potential to form oil reservoirs with gas caps.Jurassic coal seams in the Huomatu anticline and Changji-Urumqi area in the middle section of the southern margin are thick (up to 60 m), with its R_o=1.3%-2.0%.The local coal is in the dry gas generation stage, with gas yield of 60.21-104.27 mg/g.Based on the above analysis, we suggested that the coal in the middle section of the southern basinal margin has potential to form condensate gas reservoirs and dry gas reservoirs.

Key words: coal, natural gas, thermal simulation, Junggar Basin, liquid hydrocarbon, carbon isotope

CLC Number:

LI Erting, MA Wanyun, LI Ji, MA Xinxing, PAN Changchun, ZENG Lifei, WANG Ming. Thermal Simulation Experiment for Hydrocarbon Generation: A Case Study of Jurassic Coal from the Southern Margin of Junggar Basin[J]. Geoscience, 2022, 36(05): 1313-1323.

Figures/Tables 9

Table 1 Geochemical parameters of Jurassic coal from the southern margin of Junggar Basin

样号	层位	地区	岩性	TOC/%	HI/(mg/g)	T_max/℃	R_o/%
JC1	J₁b	四棵树凹陷	煤	62.39	171	428	0.39
JC2	J₁b	四棵树凹陷	煤	62.21	155	424	0.42
JC3	J₁b	阜康地区	煤	73.23	194	440	0.76
JC4	J₁b	阜康地区	煤	70.81	190	448	0.74
JC5	J₁b	阜康地区	煤	80.28	187	453	0.72
JC6	J₂x	石河子地区	煤	73.33	141	432	0.58
JC7	J₂x	昌吉地区	煤	65.89	203	424	0.49
JC8	J₂x	昌吉地区	煤	63.60	210	425	0.50
JC9	J₂x	乌鲁木齐地区	煤	69.61	156	439	0.68

Fig.1 Curve of measured Ro and thermal simulation temperature of Jurassic coal from the southern margin of Junggar Basin

Fig.2 Comparison of Eazy% Ro and formula calculation Ro of coal under different temperature simulation conditions

Fig.3 Relationship between oil yield and Ro of Jurassic coal from the southern margin of Junggar Basin

Fig.4 Relationship between C6-C14 yield and Ro of Jurassic coal from the southern margin of Junggar Basin

Fig.5 Relationship between the gas yield and Ro of Jurassic coal from the southern margin of Junggar Basin

Fig.6 Relationship between dryness coefficient of gas and Ro of Jurassic coal from the southern margin of Junggar Basin

Fig.7 Relationship between carbon isotopes of gas and Ro of Jurassic coal from the southern margin of Junggar Basin

Table 2 Geochemical parameters of natural gas in the southern margin of Junggar Basin

气田/藏	干燥系数	相态	δ¹³C₁/‰	公式计算R_o/%
霍10井区气藏	0.88~0.94	油藏	-35.8~-33.5	0.95~1.24
玛河气田	0.90~0.97	凝析气藏	-34.3~-32.5	1.13~1.39
呼图壁气田	0.94~0.96	凝析气藏	-32.8~-30.5	1.33~1.74
齐古气藏	0.96~1.00	干气藏	-33.5~-29.3	1.24~2.00

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