重庆市武隆区黄莺乡五峰组—龙马溪组剖面沉积特征及地质意义

doi:10.13809/j.cnki.cn32-1825/te.2022.01.008

Abstract

Abstract:

At present, the Wufeng-Longmaxi Marine high quality shale is the only case that has been commercially exploited in China. Taking Huangying section in Wulong District, Chongqing as an example, the characteristics of sedimentary geochemistry and their interrelationship of Marine high quality shale are studied by the field observation and field measurement combined with laboratory experiment analysis. The results show that: firstly, the black siliceous shales of Wufeng Formation and dark gray shell argillaceous limestone of Guanyinqiao Formation are exposed from bottom to top in Huangying section, which reflects the sedimentary environment from deep water shelf to shallow sea and then to deep water shelf. Secondly, the biostratigraphy of outcrop layer is continuous and intact, and the Kaidian-Rudan WF2-LM5 graptolite zone can be recognized. The graptolite type, content and preservation characteristics are closely related to the sedimentary environment. Thirdly, the Wulong area is located in the hydrocarbon generation center of the deepwater shelf. The high-quality shale has large thickness, superior static index, high hydrocarbon generation intensity and good material basis for shale gas enrichment. Fourthly, Wulong area is the sweet spot of both shale gas exploration and development because of the good accumulation and enrichment conditions of shale gas in small layer ①—④.

Key words: high quality shale, sedimentary environment, shale gas, Longmaxi-Wufeng Formation, Huangying section of Wulong

CLC Number:

TE122

Xipeng HE,Yuqiao GAO,Jun MA, et al. Sedimentary characteristics and geological significance of outcrop in Wufeng-Longmaxi Formation, Huangying Town, Wulong District, Chongqing[J]. Reservoir Evaluation and Development, 2022, 12(1): 95-106.

Figures/Tables 11

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阶	V/(V+Ni)	Al/(Al+Fe +Mn)	Al/Ti	沉积相
鲁丹阶	0.71~0.97 0.90	0.14~1.00 0.75	7.00~18.56 10.59	深水陆棚相
赫南特阶	0.97	0.59	7.36	闭塞浅海相
凯迪阶	0.88~0.97 0.92	0.54~1.00 0.87	9.50~13.16 10.59	深水陆棚相

层号	层厚（m）	手持GR（API）	TOC（%）	孔隙度（%）	石英（%）	黏土（%）	R_o（%）
⑤	8.92	166.20~206.91 206.91	3.08~4.44 3.58(21)		45.10~58.00 52.03(21)	31.7~43.4 36.63(21)
④	8.74	216.46~330.48 248.04	3.71~5.58 4.55(23)		39.10~61.10 54.38(23)	22.10~36.10 31.02(23)	3.06(1)
③	13.78	218.78~279.71 241.31	4.23~5.56 4.88(39)	4.41(1)	45.2~72.8 66.12(39)	19.9~45.1 25.20(39)	2.48~2.69 2.57(5)
②	1.36	268.20~340.96 288.47	5.32~5.53 5.43(3)		64.8~71.2 68.03(3)	22.4~28.3 25.33(3)	2.37~2.52 2.45(2)
①	6.83	120.23~246.06 197.97	3.82~7.38 4.88(23)	7.49(1)	6.10~82.00 66.31(23)	8.20~45.90 25.51(23)	2.45~2.59 2.59(5)

层号	层厚（m）	TOC （%）	孔隙度（%）	石英含量（%）	黏土含量（%）	R_o （%）
黄莺乡	32.7	3.95	5.59	61.02	28.70	2.60
LY1	31.0	4.36	4.21	62.56	25.59	2.58
LY2	35.0	4.49	4.46	57.07	23.67	2.95
LY3	35.0	3.56	3.25	54.01	25.06	3.13

Sedimentary characteristics and geological significance of outcrop in Wufeng-Longmaxi Formation, Huangying Town, Wulong District, Chongqing

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