黔北道真巴渔剖面五峰组—龙马溪组页岩地质特征

doi:10.13809/j.cnki.cn32-1825/te.2022.01.011

摘要/Abstract

摘要：

黔北地区道真巴渔剖面上奥陶统五峰组—下志留统龙马溪组一段地层出露较好,地层界限清晰完整。受全球海平面变化的控制,该剖面五峰组—龙马溪组一段自下而上发育含黏土硅质页岩、硅质页岩、含黏土硅质页岩、黏土质页岩和粉砂质页岩,与盆缘彭水地区和盆内焦石坝具有相似的纵向叠置特征。巴渔剖面五峰组—龙马溪组一段优质页岩岩性主要是含黏土硅质页岩、硅质页岩,具有与盆缘彭水地区和盆内焦石坝地区较为一致的有机质富集规律,TOC（总有机碳含量）与石英矿物含量呈正相关关系,与黏土矿物含量呈负相关关系。巴渔剖面五峰组—龙马溪组一段优质页岩总厚度26.1 m,低于盆缘彭水地区和盆内焦石坝地区,反映道真地区在上奥陶统五峰组—下志留统龙马溪组沉积时期沉积水体深度相对较浅。

关键词: 道真巴渔, 优质页岩, 硅质页岩, 页岩气, 五峰组—龙马溪组

Abstract:

The upper Ordovician Wufeng Formation and the first member of the lower Silurian Longmaxi Formation are well exposed in Bayu outcrop Daozhen, northern Guizhou, with clear and complete stratigraphic boundaries. Under the control of global sea level changes, the Wufeng Formation and the first member of the Longmaxi Formation develop clay-bearing siliceous shale, siliceous shale, clay-bearing siliceous shale, argillaceous shale and silty shale from bottom to top, which display similar longitudinal superimposition characteristics to the Pengshui area on the edge of the Sichuan Basin and Jiaoshiba area in the basin. Lithology of the organic-rich shale in Wufeng Formation and the first member of the Longmaxi Formation in Bayu outcrop of Daozhen is dominated by clay-bearing siliceous shale and siliceous shale, which have the same organic matter enrichment features as that in the Pengshui and Jiaoshiba area. Specifically, TOC is positively correlated with the content of quartz, and negatively correlated with the content of clay minerals. The total thickness of organic-rich shale in the Wufeng Formation and the first member of the Longmaxi Formation at this profile is 26.1 m, which is lower than that in the Pengshui and the Jiaoshiba area, reflecting a relatively shallow-water depositional environment in the Daozhen area.

Key words: Bayu village in Daozhen, organic-rich shale, siliceous shale, shale gas, Wufeng-Longmaxi Formation

中图分类号:

TE112

杜伟,彭勇民,龙胜祥等. 黔北道真巴渔剖面五峰组—龙马溪组页岩地质特征[J]. 油气藏评价与开发, 2022, 12(1): 130-138.

Wei DU,Yongmin PENG,Shengxiang LONG, et al. Geological characteristics of shale in Wufeng-Longmaxi Formation of Bayu outcrop in Daozhen, northern Guizhou[J]. Reservoir Evaluation and Development, 2022, 12(1): 130-138.

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样品位置	样品位置（m）	TOC （%）	黏土矿物（%）	石英矿物（%）	碳酸盐矿物（%）	其他矿物（%）
DZBY33	17.980	0.620 0	47	26	18	9
DZBY32	18.740	0.723 0	46	27	20	7
DZBY31	20.580	0.678 4	48	31	11	10
DZBY30	24.600	0.673 8	45	41	3	11
DZBY29	28.285	0.755 9	46	31	7	16
DZBY28	35.400	0.735 7	46	35	6	13
DZBY27	39.600	0.744 5	45	34	8	13
DZBY26	46.100	0.733 8	41	32	8	19
DZBY25	46.810	0.664 8	39	33	8	20
DZBY24	52.700	0.650 5	44	38	9	9
DZBY23	54.055	0.693 5	45	35	7	13
DZBY22	56.600	0.785 6	48	34	7	11
DZBY21	59.000	0.779 8	48	34	6	12
DZBY20	61.000	0.785 5	45	35	7	13
DZBY19	63.170	0.676 5	41	39	8	12
DZBY18	63.730	0.686 3	46	38	6	10
DZBY17	66.050	0.456 1	41	41	6	12
DZBY16	66.755	0.574 5	45	38	6	11
DZBY15	69.800	0.759 4	43	39	7	11
DZBY14	70.100	0.536 0	54	32	4	10
DZBY13	71.290	0.687 4	50	36	6	8
DZBY12	72.300	0.636 5	53	29	7	11
DZBY11	76.840	1.146 0	44	39	2	15
DZBY10	82.400	0.436 1	53	41	1	5
DZBY9	88.920	0.521 7	55	39	0	6
DZBY8	92.250	2.377 0	46	38	2	14
DZBY7	96.970	2.557 0	39	42	5	14
DZBY6	99.510	3.028 0	40	53	0	7
DZBY6	100.890	2.750 0	45	44	1	10
DZBY5	102.870	2.797 0	34	57	0	9
DZBY4	108.270	6.028 0	32	63	0	5
DZBY3	108.520	6.050 0	28	67	1	4
DZBY2	111.130	3.187 0	18	79	0	3
DZBY1	113.080	2.556 0	25	73	1	1