细粒沉积岩岩相组合特征及评价——以苏北盆地高邮凹陷阜宁组二段深层为例

doi:10.13809/j.cnki.cn32-1825/te.2024386

Abstract

Abstract:

Shale in continental lacustrine basins has the characteristics of diverse lithofacies types and complex vertical superposition. On the basis of lithofacies type classification, the classification of lithofacies combination types and the selection of favorable combination are of great significance for identifying the “sweet spot” layers and areas of shale oil. The second member of the Funing Formation in Gaoyou Sag is a key area and stratigraphic unit for shale oil exploration in Subei Basin. Its lithofacies types have thin single layers and frequent vertical variations. Therefore, the research on the classification and evaluation of lithofacies combination types is still in the preliminary stage. Taking the well HY7 in the deep second member of the Funing Formation in Gaoyou Sag as the research object, methods including core observation, thin section identification, whole-rock X-ray diffraction analysis, and major and trace element analysis were employed. Based on lithofacies type identification and vertical sedimentary environment evolution analysis, the lithofacies combination type classification and development patterns were investigated. By comparing the evaluation parameters of different lithofacies combination types, the favorable combination types were optimized and selected. The results showed that the well HY7 in the second member of Funing Formation was mainly composed of mixed rock facies and felsic rock facies, with layered or laminated felsic-calcareous/dolomitic mixed rocks being the most developed. The sedimentary environment of the second member of the Funing Formation vertically showed early dry-late wet climate, early shallow-late deep water depth, early high-late low salinity, early high-late low provenance supply, and early low-late high productivity, which could be divided into six evolution stages. Considering sedimentary cycle changes in each evolution stage, the vertical superposition relationships of different lithofacies types, and their thickness proportions, seven main lithofacies combination types were identified. Among them, the interbedded combination of layered or laminated felsic-argillaceous mixed rocks and felsic-calcareous/dolomitic mixed rocks had the highest thickness proportion and was the most favorable combination type. The lithofacies assemblages dominated by layered/laminated carbonate rocks and felsic-calcareous/dolomitic mixed rocks could serve as good reservoir layers.

Key words: fine-grained sedimentary rock, lithofacies combination, Subei Basin, Gaoyou Sag, second member of Funing Formation

CLC Number:

TE122

YANG Baoliang,YU Wenquan,DUAN Hongliang, et al. Characteristics and evaluation of lithofacies combination of fine-grained sedimentary rocks: A case study of deep second member of Funing Formation in Gaoyou Sag, Subei Basin[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(1): 153-161.

Figures/Tables 7

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Table 1

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岩相组合代号	岩相类型	发育层段	厚度比/%	ω（TOC）/%	S₁/ (mg/g)	S₁+S₂/ (mg/g)	含油饱和指数/(mg/g)	孔隙度/%	力学脆性指数
Ⅰ	块状黏土质长英细粒岩、长英质-黏土质混积岩	Ⅰ 亚段	11.66	1.58	0.85	4.59	54.59	3.71	30.75
Ⅱ	块状或层状长英质-灰质或白云质混积岩夹薄层长英质-黏土质混积岩	Ⅱ、Ⅳ亚段	16.84	1.14	0.99	3.71	111.13	2.88	55.56
Ⅲ	层状碳酸盐岩、长英质-灰质或白云质混积岩互层	Ⅲ亚段	4.90	0.69	1.07	2.88	150.43	3.32	60.84
Ⅳ	层状或纹层状的黏土质长英细粒岩或长英细砂岩、长英质-黏土质混积岩、长英质-灰质或白云质的混积岩，灰质或白云质英细粒岩互层	Ⅴ亚段	14.70	0.51	0.66	1.46	121.86	2.57	45.45
Ⅴ	层状或纹层状长英质-黏土质混积岩、长英质-灰质或白云质混积岩互层	Ⅳ亚段	6.92	1.19	1.01	4.31	101.54	4.00	52.60
Ⅵ	层状或纹层状长英质-灰质或白云质混积岩、灰质或白云质长英细粒岩夹薄层长英细粒岩、长英质-黏土质混积岩	Ⅳ、Ⅴ亚段	30.22	0.70	1.12	2.35	140.19	3.01	54.67
Ⅶ	层状或纹层状的黏土质长英细粒岩或长英细粒岩夹薄层长英质-灰质或白云质混积岩、长英质-黏土质混积岩	Ⅴ亚段	14.77	0.85	1.09	3.02	136.36	3.07	47.82

Characteristics and evaluation of lithofacies combination of fine-grained sedimentary rocks: A case study of deep second member of Funing Formation in Gaoyou Sag, Subei Basin

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