Reservoir Characteristics and Distribution Rule of Weathering Volcanic Crust: A Case Study of the Carboniferous Volcanic Rock in Zhongguai Uplift, NW Junggar Basin

Abstract

Abstract:

Weathering volcanic crust reservoir has become an important and new field of oil and gas exploration, its characteristics and distribution rule are of great important theoretical and practical significance to the oil and gas exploration in volcanic rocks. Through comprehensive research of well drilling, cores, logs, seismic and laboratory analyses, weathering volcanic crust reservoir characteristics and distribution rule have been comprehensively studied from the volcanic rock formation environment in Zhongguai uplift, Junggar Basin. The result shows that volcanic rocks formed in the island-arc environment, and lithology is mainly andesite and tuff. The weathering crust structure of volcanic rocks can be divided into four layers: weathered clay layer, strong weathered zone, weak weathered zone and dense non weathered zone. The strongly weathered zone is the best of the four-layer structures, which is the main reservoir development zone. Reserving space mostly contains secondary pores and fractures, and the fracture has a better effect on reservoir seepage capacity. The development of reservoir is affected by lithology and lithofacies, tectonic movement, weathering and leaching, and fault(fracture). Carboniferous system volcanic oil-gas is mainly distributed along the three zones(close to fault zone, structural high part zone, beneficial lithofacies development zone), one side(near the plane of unconformity).

Key words: weathering crust reservoir, Carboniferous volcanic, Zhongguai uplift, Junggar Basin

CLC Number:

TE122.2

FAN Cunhui, WU Qiang, DENG Yusen, LI Hu, HAN Yutian. Reservoir Characteristics and Distribution Rule of Weathering Volcanic Crust: A Case Study of the Carboniferous Volcanic Rock in Zhongguai Uplift, NW Junggar Basin[J]. Geoscience, 2017, 31(05): 1046-1058.

Figures/Tables 13

Fig.1 The location map of study area

Fig.2 TAS diagram of volcanic rocks

Fig.3 Vertical structure of weathering volcanic crust(well 597,1∶2000)

Fig.4 Pore types and characteristics of reservoirs

Fig.5 Types and characteristics of reservoir fractures

Fig.6 FMI characters of fracture with different attitude in volcanic rocks

Fig.7 Filling degree contrast figure of different angle fractures

Fig.8 The relationship between reservoir porosity and permeability in volcanic rocks

Table 1 Comparison of different ancient landform units and oil-gas shows

古地貌	井号	日产量			层位	试油结果
古地貌	井号	油/t	气/10⁴m³	水/m³	层位	试油结果
残丘及其边缘地带	JL10	17.28	0.313		C	油层
	JL10	20.16	0.244	27.84	C	油水同层
	K021	66.38	0.76	—	C	油层
	H56A	29.3	0.375	18.19	C	油水同层
	H019	105.96	2.14	—	C	油气层
	JL11	17.61	1.47	26.29	C	油气层
	JL5	0.016	—	—	C	油水同层
缓坡	596	4.04	0.023	4.6	C	油水同层
	573	96.38	0.832	—	C	油层
	JL6	5.3	—	63.2	C	油水同层
	574	14.6	0.095	—	C	油层
	561	4.52	5.514	—	C	含气水层
陡坡	G10	—	0.032	59.3	C	气水同层
	G10	0.003	0.098	26.8	C	气水同层
	G6	—	—	5.2	C	水层
沟槽	G26	—	—	—	C	干层
沟槽	G150	—	—	—	C	干层
溶坪、洼地	未钻探

Fig.9 Well-tie profile of the Carboniferous volcanic crust in Zhongguai uplift

Fig.10 The relationship between volcanic rock porosity and top depth away from the carboniferous

Fig.11 Oil and gas migration profile of the Carboniferous volcanic crust in Zhongguai uplift[18]

Fig.12 Oil and gas distribution of the Carboniferous volcanic crust in Zhongguai uplift

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