超深层碳酸盐岩层系硅质岩储层表征与评价——以塔里木盆地塔深6井为例

doi:10.11743/ogg20210302

Abstract

Abstract:

Thick chert reservoirs were revealed by Well Tashen 6 penetrating the Ordovician Penglaiba Formation in the Tarim Basin and have been the focus of research for reservoir development characteristics and storage capacity. Based on lithology and electrical response characteristics, the reservoirs were studied with detailed core observation and description, X-ray diffraction, microscopic petrology analysis, reservoir performance and other reservoir characterization and evaluation methods. The results show that the reservoirs have higher porosity than dolostone reservoirs of the same sequence, with an average porosity as high as 13.5% at a burial depth of more than 7 400 m. The reservoirs are mainly composed of microcrystalline quartz, with a content as high as 83.0%-93.7%, and a small amount of clay, calcite, dolomite and other minerals. The reservoir space is relatively uniformly distributed intercrystalline micropores in quartz crystals with a pore diameter mainly varying from 1 to 10 μm, followed by 0.1-1 μm, and main throat diameter ranging from 10 to 100 μm. The off-line nuclear magnetic resonance of pressure saturated crude samples shows that pores of 0.1-10 μm in diameter serve as the main storage space. And the greater the total porosity, the greater the total amount of crude oil that can be accommodated. The interbedded siliceous-dolomite, the micro-bedding structure, the high initial porosity and the symbiotic siliceous nodules, all indicate that the reservoirs are the co-product of sedimentation and diagenesis in relatively deep water area on the platform. Furthermore, the seismic reflection characteristics reveal that the reservoir body is about 300 m long from north to south and 200 m wide from east to west. The discovery of siliceous rock reservoirs is of great significance to understanding the internal structural differences of the Early Ordovician carbonate platform in the Tarim Basin.

Key words: nuclear magnetic resonance (NMR), Penglaiba Formation, chert reservoir, ultra-deep carbonate reservoir, Ordovician, Tarim Basin

CLC Number:

TE122.2

Yongli Liu, Donghua You, Haiying Li, Lijun Gao, Hong Jiang, Weifeng Zhang, Fang Bao. Characterization and evaluation of chert reservoirs in ultra-deep carbonate rock formations-A case study on Well TS 6 in the Tarim Basin[J]. Oil & Gas Geology, 2021, 42(3): 547-556.

Figures/Tables 14

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References 21

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样品号	矿物含量/%
样品号	粘土	石英	方解石	白云石	黄铁矿	其他矿物
TS6-2-1	5.2	84.9	7.8	0.6	0.9	0.6
TS6-2-2	7.8	85.2	5.6	0.1	0.7	0.6
TS6-14-1	9.0	86.7	3.2	0.5	—	0.6
TS6-14-2	4.4	93.7	0.4	0.5	0.7	0.3
1-5	4.8	83.0	10.1	0.1	1.8	0.2
2-1	3.3	91.8	3.7	0.5	0.5	0.2

样品号	总孔隙度/%	不同孔隙直径分布范围的孔隙体积占比/%
样品号	总孔隙度/%	< 0.1 μm	0.1~1 μm	1~10 μm	>10 μm
2-8	9.1	1.11	2.48	5.52	—
2-9-2	8.2	1.06	2.39	4.60	0.15
2-9-3	8.5	1.34	2.86	4.30	—
12	17.4	1.48	3.97	11.92	0.03
22	12.3	1.08	1.28	8.68	1.26
1	13.0	11.37(< 10 μm的孔隙体积占比)			1.63
24	12.8	9.84(< 10 μm的孔隙体积占比)			2.96

样品号	深度/m	岩性	孔隙度/%	渗透率/(10^-3 μm²)	备注
1	7 418.38	硅质岩(薄层)	13.0	0.05	井壁取心
2	7 418.68	硅质岩(薄层)	17.1	0.08	井壁取心
12	7 547.47	硅质岩(厚层)	17.4	0.13	井壁取心
13	7 548.00	硅质岩(厚层)	12.6	0.36	井壁取心
14	7 549.09	硅质岩(厚层)	12.3	—	井壁取心
16	7 554.19	硅质岩(厚层)	27.9	0.71	井壁取心
19	7 561.49	硅质岩(厚层)	11.0	0.03	井壁取心
21	7 571.48	硅质岩(厚层)	16.2	0.54	井壁取心
22	7 576.71	硅质岩(厚层)	12.3	0.09	井壁取心
24	7 592.65	硅质岩(厚层)	12.8	0.66	井壁取心
25	7 603.85	硅质岩(厚层)	10.2	0.13	井壁取心
2-8	7 442.60	硅质岩(薄层)	9.1	0.02	岩心
2-9-2	7 442.70	硅质岩(薄层)	8.2	0.02	岩心
2-9-3	7 442.75	硅质岩(薄层)	8.5	0.01	岩心
5	7 432.48	白云岩	4.5	0.01	井壁取心
9	7 491.18	白云岩	3.0	0.02	井壁取心
28	7 268.79	白云岩	1.6	0.09	井壁取心
29	7 716.48	白云岩	5.3	0.03	井壁取心
2-9-4	7 442.80	白云岩	1.3	0	岩心
2-9-5	7 442.85	白云岩	1.0	0	岩心

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Characterization and evaluation of chert reservoirs in ultra-deep carbonate rock formations-A case study on Well TS 6 in the Tarim Basin

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