塔里木盆地深层奥陶系走滑断裂区与非走滑断裂区储层流体超压演化差异特征与成藏机制

doi:10.11743/ogg20250315

Abstract

Abstract:

The deep Ordovician reservoirs in areas with and without strike-slip faults in the Tarim Basin exhibit significant difference in fluid pressure evolution characteristics. Existing exploration practices have shown areas without strike-slip faults hold significant potential for deep hydrocarbon exploration and exploitation. However， there is a lack of systematic studies on the hydrocarbon accumulation and overpressure evolution processes in these areas. In this study， we examine these processes in areas with and without strike-slip faults within the Fuman oilfield based on log data， reservoir characteristics， paleo-pressure reconstruction from fluid inclusions， and the calcite U-Pb isotopic dating. The results are as follows. First， the areas without strike-slip faults in the Tarim Basin underwent three critical pressure evolution stages， namely normal pressure， weak overpressure， and strong overpressure in sequence. On the other hand， the areas with strike-slip faults in the basin also experienced three critical pressure evolution stages： normal pressure， weak overpressure， and normal pressure in sequence. Second， during the Middle-to-Late Caledonian， crude oil charging occurred for reservoirs in these areas， resulting in weak overpressure. In the late stage， numerous pores and fractures are formed in carbonate reservoirs in these areas under tectonic fracturing combined with the dissolution of fluids migrating along faults. The interconnected reservoirs facilitate the redistribution of overpressure within the connected fault systems. As a result， the formation pressure in these areas was gradually reduced to be normal. Third， in the areas without strike-slip faults， the formation pressure increased rapidly to strong overpressure during the Early Yanshanian due to two factors： the lateral migration of deep gas from oil cracking to the Ordovician reservoirs along faults and unconformities and the tectonic compression. The overpressure has been maintained up to now. Fourth， hydrocarbon accumulation in the areas without strike-slip faults followed a sequence characterized by early-stage oil generation， late-stage gas invasion， and lateral adjustment.

Key words: fluid inclusion, overpressure evolution, U-Pb isotopic dating, fault-controlled hydrocarbon accumulation, formation fluid, Ordovician, Tarim Basin

CLC Number:

TE122.2

Yifan XUE, Haitao ZHAO, Yahao HUANG, Zhigang WEN, Yukun LIU, Yintao ZHANG, Zhanfeng QIAO, Tao LUO. Differential fluid overpressure evolution and hydrocarbon accumulation mechanisms of deep Ordovician reservoirs in areas with and without strike-slip faults， Tarim Basin[J]. Oil & Gas Geology, 2025, 46(3): 926-943.

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区域	井号	主干断裂带	距主干断裂带距离^a/km	压力系数^b
非断裂区	GL2	F_I10	20.2	1.68
	FY104	F_I9	6.3	1.89
	HD23	F_I13	4.2	2.01
	YM9	F_I7	3.1	1.62
	YK101	F_I14	3.2	1.26
	YK1	F_I14	5.8	1.45
	YM8	F_I9	3.4	1.31
断裂区	YM5	F_I7	0	1.09
	FY101	F_I9	0	1.09
	HD251	F_I12	0	1.07
	HD201-H6	F_I15	0	1.08
	GL301H	F_I5	0	1.07
	GL305H	F_I5	0	1.01
	FY202	F_I11	0	1.14
	MS1-H1	F_I17	0	1.16
	MS1	F_I17	0	1.11

井号	荧光颜色	油包裹体均一温度/℃	气/液比/%	伴生盐水包裹体均一温度/℃	捕获压力/MPa	捕获深度/m	压力系数
YM5	绿色	56.4	9.1	72.4	31.5	2 635	1.21
YM5	绿色	58.2	6.4	75.1	33.6	2 587	1.29
YM5	绿色	56.1	8.9	74.3	34.5	2 618	1.33
YM5	绿色	57.2	12.3	74.9	33.3	2 665	1.28
YM5	绿色	55.4	4.9	72.8	33.3	2 579	1.28
YM5	蓝白色	78.2	7.5	98.4	32.5	3 146	1.05
YM5	蓝白色	76.5	8.2	97.6	34.0	3 123	1.10
YM5	蓝白色	77.4	9.6	102.5	36.8	3 531	1.05
YM5	蓝白色	79.3	5.8	98.3	32.7	3 125	1.06
YM5	蓝白色	76.8	5.9	104.5	37.3	3 542	1.07
YM5	蓝白色	74.8	6.4	97.1	32.8	3 127	1.06
FY102	绿色	62.4	8.8	84.9	37.0	3 025	1.23
FY102	绿色	64.4	9.4	82.8	38.7	3 018	1.29
FY102	绿色	63.3	9.6	83.4	38.6	2 990	1.29
FY102	绿色	66.9	5.7	85.6	40.1	2 986	1.34
FY102	绿色	64.8	12.5	87.1	39.4	3 008	1.31
FY102	蓝白色	75.9	10.5	98.3	34.4	3 153	1.11
FY102	蓝白色	76.4	9.7	99.8	34.3	3 068	1.10
FY102	蓝白色	76.3	6.4	103.6	37.5	3 128	1.16
FY102	蓝白色	75.9	7.5	104.9	38.0	3 072	1.09
GL2	绿色	86.4	6.8	96.8	42.4	3 523	1.21
GL2	绿色	85.2	8.4	106.4	41.3	3 525	1.18
GL2	绿色	87.2	7.5	108.7	42.5	3 448	1.25
GL2	绿色	87.1	10.1	113.5	42.2	3 459	1.24

甲烷伸缩振动峰拉曼位移/cm^-1	气包裹体密度/（g/cm³）	伴生盐水包裹体均一温度/℃	捕获压力/MPa	压力系数
2 911.03	0.268 4	133.5	86.79	1.74
2 911.02	0.268 9	133.5	87.14	1.74
2 911.01	0.269 4	133.5	87.50	1.75
2 911.03	0.268 4	133.5	86.79	1.74
2 911.05	0.267 4	133.8	86.18	1.72
2 911.05	0.267 4	133.8	86.18	1.72
2 911.12	0.264 0	133.8	83.75	1.68
2 911.05	0.267 4	133.8	86.18	1.72
2 911.06	0.267 0	133.8	85.83	1.72
2 911.09	0.265 5	135.6	85.40	1.71
2 911.10	0.265 0	135.6	85.06	1.70
2 911.08	0.266 0	135.6	85.75	1.72
2 911.08	0.266 0	135.6	85.75	1.72
2 911.07	0.266 5	135.6	86.10	1.72

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Differential fluid overpressure evolution and hydrocarbon accumulation mechanisms of deep Ordovician reservoirs in areas with and without strike-slip faults， Tarim Basin

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