四川盆地元坝地区上二叠统海相凝灰沉积储层特征

doi:10.11743/ogg20220412

Abstract

Abstract:

The study focuses on the petrological characteristics， reservoir space characteristics and diagenesis of the Upper Permian marine tuffaceous deposits in Yuanba area， Sichuan Basin based on thin section observation， analysis of scanning electron microscope （SEM） and energy dispersive spectroscopy （EDS）， X-ray diffraction analysis， and mercury intrusion porosimetry （MIP） test. The research results indicate that the tuffaceous deposits interbedding with organic mudstones and carbonaceous mudstones are in laminae of 0.1-10.0 mm thick， and sandwiched within biogenetic limestones or marlstones， which can be classified into tuff， sedimentary tuff and tuffaceous sedimentary rocks. Under the joint effect of seawater and hydrotherm， the tuffaceous deposits have been altered by diagenetic effects such as recrystallization， cementation， metasomasis， dissolution and filling， resulting in a variety of secondary rock types. Acidic hydrotherm can dissolve tuffs and water-rock reaction serves to reproduce an alkaline environment resulting in filling or metasomasis of ferrodolomite/dolomite， gypsum， and a small amount of albite and barite. At the same time， the alkaline environment is also favorable for the formation and preservation of illite or mixed-layer illite/smectite， which in turn stimulates the formation of micrometer-scale dissolved pores in tuffs and nanometer-scale intercrystal pores in authigenic clay. In addition， the directionality of detrital and authigenetic clay minerals， and the existence of laminae in the tuffaceous deposits are conducive to the formation of bedding-parallel fractures， which have effectively improved the reservoir property of the rocks.

Key words: petrological feature, diagenesis, reservoir space, tuffaceous deposit, Upper Permian, Yuanba area, Sichuan Basin

CLC Number:

TE122.2

Fang Xiang, Qian Xiao, Xiantao Yu, Hengxu Huang, Xiang Zhu. Reservoir characteristics of the Upper Permian marine tuffaceous deposits in Yuanba area， Sichuan Basin[J]. Oil & Gas Geology, 2022, 43(4): 889-901.

Figures/Tables 14

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Table 1

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Table 6

Fig.8

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测试点号	元素的原子数百分比/%
测试点号	C	O	Mg	Al	Si	K	Ca	Ti	Fe	Na	Mn	S	Cl
Spot 1	24.06	60.99	3.61	0.21	0.29	—	7.02	—	3.70	—	0.12	—	—
Spot 2	11.84	60.95	0.85	9.33	13.78	2.28	0.42	0.28	0.27	—	—	—	—
Spot 3	19.19	55.96	0.55	7.39	10.62	1.61	—	—	—	0.34	—	—	—
Spot 4	14.38	47.33	0.86	12.11	19.72	4.73	—	—	0.87	—	—	—	—
Spot 5	85.88	11.02	0.12	0.50	1.07	0.14	—	—	—	—	—	0.11	0.09
Spot 6	13.04	58.38	—	0.52	0.78	—	13.49	—	0.20	—	—	13.59	—

岩石类型	样品深度/m	矿物成分含量/%
岩石类型	样品深度/m	粘土矿物	石英	斜长石	方解石	白云石*	菱铁矿	黄铁矿	重晶石	石膏	硬石膏
粘土化和云化有机质晶屑-玻屑凝灰岩	6 935.5	47.2	20.8	5.5	1.2	10.1	0.7	13.1	0.3	0.2	0.9
含凝灰有机质泥岩	6 936.3	43.2	24.6	3.9	0.8	20.8	0.5	5.1	0.3	—	0.8

岩石类型	样品深度/m	粘土矿物类型及相对含量/%
岩石类型	样品深度/m	蒙脱石	伊/蒙混层粘土	伊利石	高岭石	绿泥石	绿/蒙混层粘土	%S
粘土化和云化有机质晶屑-玻屑凝灰岩	6 935.5	—	74	26	—	—	—	10
含凝灰有机质泥岩	6 936.3	—	72	28	—	—	—	10

样品号	井深/m	薄片鉴定岩性	孔、缝类型在薄片中的面积比/%
样品号	井深/m	薄片鉴定岩性	铸模孔	凝灰质溶孔	（铁）白云石溶孔	炭屑残余孔	总面孔率	裂缝面缝率
		平均值/%	5.21	4.67	1.50	2.17	6.15	4.50
B0	6 934.72	含有机质含硅含凝灰生屑灰岩	1.00	—	—	—	1.00	—
B1	6 934.77	凝灰质炭质粉-细云岩（原岩为炭质凝灰岩）	6.00	—	—	—	6.00	—
B2-1	6 934.98	含云灰岩	—	—	—	—	—	—
B2-2	6 935.11	含凝灰有机质粉-细晶云岩	—	—	—	—	—	0.50
B2-3	6 935.16	含灰含有机质凝灰质云岩（原岩为有机质晶屑- 玻屑凝灰岩）	—	3.00	2.00	—	5.00	0.50
B3	6 935.22	含生屑含有机质含凝灰微晶云岩	—	—	—	—	—	2.50
B3-1	6 935.25	含膏凝灰质有机质不等晶云岩（原岩为含生屑有机质玻屑-岩屑凝灰岩）	—	—	—	—	—	5.00
B4	6 935.38	凝灰质有机质微-粉晶云岩	—	—	—	—	—	5.00
B5	6 935.50	含膏含凝灰炭质粉晶云岩（原岩为炭质玻屑凝灰岩）	—	—	—	—	—	4.00
B5-1	6 935.52	凝灰质有机质微-粉晶云岩	4.00	—	—	1.00	5.00	—
B5-2	6 935.54	含膏含有机质含凝灰细-粉晶云岩（原岩为有机质晶屑-玻屑凝灰岩）	—	—	—	—	—	10.00
B5-3	6 935.56	含膏炭质凝灰质云岩（原岩为炭质玻屑凝灰岩）	—	6.00	0.50	0.50	7.00	7.00
B6	6 935.69	含凝灰云质有机质泥岩	2.50	—	—	—	2.50	5.50
B6-1	6 935.72	含膏含炭云质玻屑凝灰岩	—	5.00	2.00	—	7.00	5.50
B7	6 936.01	含凝灰云质有机质泥岩	10.00	—	—	—	10.00	—
B8	6 936.53	含凝灰云质有机质泥岩	6.00	—	—	5.00	11.00	—
B9	6 936.75	含凝灰云质有机质泥岩	7.00	—	—	—	7.00	4.00

样品号	井深/m	岩性	孔隙度/%	渗透率/（10^-3 μm²）
B0	6 934.72	含有机质含硅含凝灰生屑灰岩	4.11	0.000 11
B2-1	6 935.06	含云灰岩	2.64	0.000 19
B2-3	6 935.16	含灰含有机质凝灰质云岩（原岩为有机质晶屑-玻屑凝灰岩）	7.29	0.000 11
B6	6 935.69	含凝灰云质有机质泥岩	10.01	0.015 50
B7-1	6 936.13	含凝灰云质有机质泥岩	11.60	0.000 39

Reservoir characteristics of the Upper Permian marine tuffaceous deposits in Yuanba area， Sichuan Basin

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样品号	井深/m	凝灰成分含量/%			非凝灰成分含量/%
样品号	井深/m	岩屑	晶屑	玻屑	有机质	泥质	方解石	（铁）白云石	自生石英	炭屑	石膏	钠长石	黄铁矿
B0	6 934.72	—	5	15	10	—	50	—	20	—	—	—	—
B1	6 934.77	5	—	20	—	—	5	40	—	30	—	—	—
B2-1	6 934.98	—	—	—	—	—	60	14	6	—	—	—	20
B2-2	6 935.11	—	—	10	30	—	—	50	—	—	—	—	10
B2-3	6 935.16	—	7	20	10	—	8	40	—	10	—	—	5
B3	6 935.22	15	—	15	15	—	—	50	5	—	—	—	—
B3-1	6 935.25	—	6	20	15	—	—	30	—	10	5	4	10
B4	6 935.38	—	—	25	20	—	—	40	—	15	—	—	—
B5	6 935.50	—	—	10	—	—	—	47	—	15	8	—	20
B5-1	6 935.52	—	—	25	10	—	—	35	—	10	—	—	20
B5-2	6 935.54	—	5	20	10	—	—	40	—	10	4	1	10
B5-3	6 935.56	—	3	24	—	—	—	30	—	35	6	2	—
B6	6 935.69	—	5	5	5	45	—	35	—	5	—	—	—
B6-1	6 935.72	—	5	32	10	—	—	35	—	10	6	2	—
B7	6 936.01	—	5	15	10	40	—	20	—	5	—	—	5
B8	6 936.53	—	5	15	10	40	—	15	—	10	—	—	5
B9	6 936.75	—	5	15	10	40	—	15	—	5	—	—	10

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[5]	Hui PAN, Yuqiang JIANG, Xun ZHU, Haibo DENG, Linke SONG, Zhanlei WANG, Miao LI, Yadong ZHOU, Linjie FENG, Yongliang YUAN, Meng WANG. Evaluation of geological sweet spots in fluvial tight sandstone gas： A case study of the first submember of the second member of the Jurassic Shaximiao Formation， central Sichuan Basin [J]. Oil & Gas Geology, 2024, 45(2): 471-485.
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[10]	Guangfu WANG, Fengxia LI, Haibo WANG, Tong ZHOU, Yaxiong ZHANG, Ruyue WANG, Ning LI, Yuxin CHEN, Xiaofei XIONG. Difficulties and countermeasures for fracturing of various shale gas reservoirs in the Sichuan Basin [J]. Oil & Gas Geology, 2023, 44(6): 1378-1392.
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[12]	Dongfeng HU, Zhihong WEI, Ruobing LIU, Xiangfeng WEI, Wei WANG, Qingbo WANG. Discovery of the Qijiang shale gas field in a structurally complex region on the southeastern margin of the Sichuan Basin and its implications [J]. Oil & Gas Geology, 2023, 44(6): 1418-1429.
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