Controlling Factors of Thick Glutenite Reservoir Accumulation in Hetao Basin: A Case Study of Jihua-2X Reservoir, Linhe Sag

doi:10.19657/j.geoscience.1000-8527.2021.058

Abstract

Abstract:

In the Meso-Cenozoic Hetao Basin, the early-stage wells have oil and gas shows but there is no substantial exploration breakthrough. The discovery of thick glutenite reservoir layer of Jihua-2X indicates good exploration prospect in the basin. To understand the hydrocarbon accumulation characteristics and delineate favorable exploration targets in the basin, we took the Jihua-2X reservoir as a research target. The major controlling factors on the accumulation of thick glutenite reservoir layers was clarified by analyzing the Jihua-2X reservoir, which is located in the eastern wing of the Jilantai tectonic belt (west of the Linhe depression). It is an inherited nose structure controlled by the Langshan branch fault. The oil-bearing sandstone is the fan delta sandbody in the Paleogene Linhe Formation and Cretaceous Guyang Formation. The Jihua-2X reservoir is well-developed and has high degree of enrichment. Matured source rocks of the Guyang Formation in the sub-sag area with high hydrocarbon expulsion power is necessary for hydrocarbon accumulation in the Jihua-2X trap. Furthermore, fan delta reservoir with high sand-strata ratio and successive nose structure, and interconnected migration pathway was likely the key for hydrocarbon accumulation in the Jihua-2X trap. Our results can provide a geological foundation for future exploration in the Hetao basin.

Key words: thick glutenite reservoir, nose structure, controlling factors of reservoir accumulation, Jihua-2X reservoir, Linhe Depression

CLC Number:

TE122.3

WANG Huilai, SUN Ruina, ZHANG Ruifeng, LIU Xiheng, LIU Jing, TIAN Sisi, XIAO Jinxia. Controlling Factors of Thick Glutenite Reservoir Accumulation in Hetao Basin: A Case Study of Jihua-2X Reservoir, Linhe Sag[J]. Geoscience, 2021, 35(03): 861-870.

Figures/Tables 10

Fig.1 Location and distribution of structural units in the Linhe Depression, Hetao Basin

Fig.2 Top structural map of K1g1 II of the Jihua-2X reservoir

Fig.3 Integrated column diagram of the Paleogene and Cretaceous strata, well Jihua 2-4X

Fig.4 Oil reservoir profile in the Jihua-2X block

Table 1 Integrated evaluation of the K1g1 source rocks in the Linhe Depression

地层	井号	生油岩
地层	井号	厚度/m	有机碳/%	生油潜量/(mg/g岩石)	氯仿沥青“A”/%	总烃含量/10^-6	评价
下白垩统	松探1	57	$0.14 ~ 3.55 1.29 (33)$	$(0.03 ~ 19.87) 5.41 (31)$	$0.5249 ~ 1.3163 0.902 (6)$		中等-好
	临华参1	248	$(0.54 ~ 1.69) 0.87 (34)$	$(0.2 ~ 4.75) 2.1 (34)$	$(0.006 ~ 0.588) 0.16 (15)$	$(524.37 ~ 957.71) 741.04 (3)$	中等
	JHZK9	84	$(0.19 ~ 4.08) 1.33 (32)$	$(0.15 ~ 24.2) 6.86 (31)$	$(0.054 ~ 1.373) 0.618 (12)$		中等-好
	松5	101	$(0.05 ~ 1.2) 0.48 (6)$	$(0.05 ~ 2.72) 0.83 (6)$	$(0.0015 ~ 0.1593) 0.063 (2)$		差-中等
	吉华14X	97	$(0.61) 0.61 (1)$				差
	吉华18X	160	$(0.22 ~ 1.04) 0.59 (14)$	$(0.26 ~ 3.5) 1.45 (14)$			中等-差
	吉华30	115	$(0.16 ~ 0.77) 0.39 (18)$	$(0.17 ~ 2.25) 0.73 (18)$			差
	吉华28X	135	$(0.2 ~ 1.05) 0.41 (17)$	$(0.20 ~ 3.94) 1.07 (17)$			差

Table 1 Integrated evaluation of the K1g1 source rocks in the Linhe Depression

地层	井号	生油岩
地层	井号	厚度/m	有机碳/%	生油潜量/(mg/g岩石)	氯仿沥青“A”/%	总烃含量/10^-6	评价
下白垩统	松探1	57	$0.14 ~ 3.55 1.29 (33)$	$(0.03 ~ 19.87) 5.41 (31)$	$0.5249 ~ 1.3163 0.902 (6)$		中等-好
	临华参1	248	$(0.54 ~ 1.69) 0.87 (34)$	$(0.2 ~ 4.75) 2.1 (34)$	$(0.006 ~ 0.588) 0.16 (15)$	$(524.37 ~ 957.71) 741.04 (3)$	中等
	JHZK9	84	$(0.19 ~ 4.08) 1.33 (32)$	$(0.15 ~ 24.2) 6.86 (31)$	$(0.054 ~ 1.373) 0.618 (12)$		中等-好
	松5	101	$(0.05 ~ 1.2) 0.48 (6)$	$(0.05 ~ 2.72) 0.83 (6)$	$(0.0015 ~ 0.1593) 0.063 (2)$		差-中等
	吉华14X	97	$(0.61) 0.61 (1)$				差
	吉华18X	160	$(0.22 ~ 1.04) 0.59 (14)$	$(0.26 ~ 3.5) 1.45 (14)$			中等-差
	吉华30	115	$(0.16 ~ 0.77) 0.39 (18)$	$(0.17 ~ 2.25) 0.73 (18)$			差
	吉华28X	135	$(0.2 ~ 1.05) 0.41 (17)$	$(0.20 ~ 3.94) 1.07 (17)$			差

Fig.5 Contour map of the E3l3 and K1g1 source rocks in the Hetao Basin

Fig.6 Biomarker characteristics of crude oil and source rocks in the Linhe Depression

Fig.7 Tectonic evolution profile in the downthrown block of Langshan branch fault (profile location in Fig.8)

Fig.8 Guyang Formation sedimentary facies in the Jilantai tectonic belt

Fig.9 Oil reservoir profile in the Jihua-2X block

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