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

摘要/Abstract

摘要：

五峰组—龙马溪组海相优质页岩是目前国内唯一实现页岩气商业开采的页岩层。以重庆武隆地区黄莺乡剖面为例,通过野外观察和实测,结合室内实验分析,研究海相优质页岩地层、沉积、地化等特征及其相互关系。结果表明：①黄莺乡剖面自下而上出露五峰组黑色硅质页岩、观音桥段深灰色介壳泥质灰岩、龙马溪组黑色页岩,整体反映由深水陆棚到闭塞浅海再到深水陆棚的沉积环境;②出露地层生物地层连续完整,可识别出凯迪阶—鲁丹阶WF2—LM5笔石带,笔石种类、含量、保存特征等与沉积环境密切相关;③武隆地区处于深水陆棚成烃中心,优质页岩厚度大,静态指标优越,页岩生烃强度大,具备良好的页岩气富集物质基础;④武隆地区①—④小层的页岩气成藏条件和富集条件较好,是页岩气勘探开发甜点段。

关键词: 优质页岩, 沉积环境, 页岩气, 五峰组—龙马溪组, 武隆黄莺乡剖面

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

中图分类号:

TE122

何希鹏,高玉巧,马军等. 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[J]. 油气藏评价与开发, 2022, 12(1): 95-106.

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.

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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