塔里木盆地富满油田走滑断裂带通源性评价

doi:10.11743/ogg20240315

Abstract

Abstract:

The formation of hydrocarbon reservoirs in the Tarim Basin is significantly influenced by strike-slip fault zones， whose connectivity with source rocks is vital for hydrocarbon migration and accumulation. The 3D seismic data helps us to assess the connectivity of source rocks with the F_Ⅰ17 strike-slip fault zone in block Ⅱ of the Fuman oilfield using both a discrete element model （DEM） for Riedel shear structures and a perfectly plastic medium- stress ascending function model. The findings reveal that the drag-point depth （h） of the en echelon faults of F_I17 during the Late Hercynian obtained by theoretical calculation is far less than that measured by the Riedel shear DEM. This discrepancy suggests that the strike-slip faults of F_Ⅰ17 originated from T-tensional rupturing rather than R-shear rupturing. The average depths of source rocks connected to the F_I17 reach up to 9-18 km， suggesting that this fault zone acts as an immediate channel for the migration of hydrocarbons generated by the underlying source rocks of the Yurtus Formation at a burial depth of over 10 km to the overlying fault-karst （or fractured karst） traps of the Ordovician to form reservoirs. The depth （H） of source rocks connected to the F_I17 zone increase from north to south. Parameters of the fault-controlled hydrocarbon reservoirs of F_I17 zone， such as crude oil density， natural gas dryness coefficient， and hydrocarbon charging stages and their respective contributive degrees， are closely associated with the connectivity of F_I17 zone with source rocks. Thereby， such connectivity plays a role in controlling hydrocarbon accumulation， with the controlling effects varying with the order， along-strike segmentation， activity intensity， and strike-slip fault-cut strata. The connectivity of the F_I17 with source rocks changes significantly along the fault strikes， which affects the efficiency of vertical hydrocarbon transport.

Key words: connectivity with source rocks, ancient source rock, ultra-deep sequence, strike-slip fault, Fuman oilfield, Tarim Basin

CLC Number:

TE121.2

Yanqiu ZHANG, Honghan CHEN, Xiepei WANG, Peng WANG, Danmei SU, Zhou XIE. Assessment of connectivity between source rocks and strike-slip fault zone in the Fuman oilfield， Tarim Basin[J]. Oil & Gas Geology, 2024, 45(3): 787-800.

Figures/Tables 15

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分段	雁列断裂长度（L）/m	雁列角（ω）/（°）	雁列断裂间隔（S）/m	雁列断裂深度（h）/m
分段	雁列断裂长度（L）/m	雁列角（ω）/（°）	雁列断裂间隔（S）/m	计算值	计算平均值	实测平均值
A段	4 367.33	32.91	1 417.89	525.74	448.07	2 555.4
	3 712.23	37.90	813.64	279.57
	3 852.83	35.03	1 352.08	482.31
	4 780.14	37.17	1 390.97	481.91
	4 424.17	37.72	1 358.06	467.56
	2 578.52	35.50	1 274.30	451.34
B段	2 405.03	54.28	320.07	100.64	88.45	2 102.0
	3 227.64	55.21	281.18	88.20
	2 485.79	55.47	251.27	78.77
	1 893.51	53.62	251.27	79.15
	2 366.14	49.42	299.13	95.50
C段	3 197.73	47.73	355.97	114.41	142.34	2 074.0
	3 724.20	47.32	499.55	160.84
	4 005.38	48.43	361.95	116.00
	4 056.24	46.87	559.38	180.46
	3 987.44	45.34	430.75	139.99
D段	2 734.07	55.43	1 423.87	446.39	513.85	3 932.6
	3 323.36	49.90	1 758.90	560.58
	4 816.03	44.04	1 633.26	534.57

参数	符号及单位	取值
断裂区域内介质密度	ρ，kg/m³	2 400.00
重力加速度	g，m/s²	9.80
断裂区域内摩擦系数	μ_φ，无量纲	1.19
断裂面内摩擦系数	μ_f，无量纲	0.32
脆性地层区域内聚力	C₀，KPa	16 507.00
断裂面内聚力［据公式（3）计算］	C_1（_K_v=0.75），kPa	9 478.58
	C_1（_K_v=0.55），kPa	6 081.40
	C_1（_K_v=0.35），kPa	3 901.79
	C_1（_K_v=0.15），kPa	2 503.36
雁列断裂深度	h，km	2.50
雁列断裂间隔	S，km	0.75
内摩擦角	φ=2 （45°-ω），（°）	据ω计算
岩石完整性系数	K_v，无量纲	按表1取值

断裂分段	雁列断裂长度（L）/km		雁列断裂深度（h）/km		雁列角（ω）/rad		雁列距离（S′）/km		雁列断裂平均间隔（S）/km
断裂分段	范围	平均值	范围	平均值	范围	平均值	范围	平均值	S=S′ sinω
A段	4.367 3	3.952 5	2.176 3	2.537 3	0.574 1	0.628 7	1.417 9	1.267 8	0.745 6
	3.712 2		2.676 0		0.661 1		0.813 6
	3.852 8		2.745 8		0.611 1		1.352 1
	4.780 1		2.609 7		0.648 4		0.391 0
	4.424 2		2.535 5		0.658 0		1.358 1
	2.578 5		2.588 8		0.619 3		1.274 3
B段	2.405 0	2.475 6	2.002 9	2.102 0	0.946 9	0.935 0	0.320 1	0.280 6	0.225 8
	3.227 6		2.154 2		0.963 1		0.281 2
	2.485 7		2.237 5		0.967 6		0.251 3
	1.893 5		2.013 3		0.935 4		0.251 3
	2.366 1		—	—	0.862 1		0.299 1
C段	3.197 7	3.794 2	2.018 1	2.074 0	0.832 6	0.822 3	0.356 0	0.441 6	0.323 5
	3.724 2		2.166 2		0.825 5		0.499 6
	4.005 4		2.203 2		0.844 8		0.362 0
	4.056 2		1.908 5		0.817 6		0.559 4
	3.984 2		—	—	0.790 9		0.430 8
D段	3.901 1	4.181 6	3.581 9	3.932 6	0.966 9	0.868 6	1.423 9	1.605 4	1.225 5
	3.827 8		3.761 3		0.870 5		1.758 9
	4.816 0		4.454 5		0.768 3		1.633 3

断裂分段	地层完整系数（K_v）	通源深度（H）/km
断裂分段	地层完整系数（K_v）	范围	平均值
A段	1.00	8.60	9.18
	0.95	9.01
	0.90	9.38
	0.85	9.72
B段	1.00	16.56	18.17
	0.95	17.71
	0.90	18.74
	0.85	19.66
C段	1.00	14.91	16.04
	0.95	15.72
	0.90	16.43
	0.85	17.08
D段	1.00	14.55	15.10
	0.95	14.94
	0.90	15.29
	0.85	15.61

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[15]	Jianzhang LIU, Zhongxian CAI, Changyu TENG, Heng ZHANG, Chen CHEN. Coupling relationship between formation of calcite veins and hydrocarbon charging in Middle-Lower Ordovician reservoirs in strike-slip fault zones within craton in Shunbei area， Tarim Basin [J]. Oil & Gas Geology, 2023, 44(1): 125-137.

Assessment of connectivity between source rocks and strike-slip fault zone in the Fuman oilfield， Tarim Basin

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