鄂西地区下震旦统陡山沱组二段剖面特征及页岩气地质意义

doi:10.13809/j.cnki.cn32-1825/te.2022.01.015

摘要/Abstract

摘要：

随着黄陵背斜南翼下震旦统陡山沱组全球最古老页岩气的首次发现,该层系暗色页岩的含气性已获得证实。陡山沱组二段作为主力含气页岩层段分布广、沉积厚度大、页岩质量好。在鄂西地区选取典型的三斗坪镇头顶石村早震旦世剖面进行了地质测量,并针对陡山沱组二段开展小层划分和特征描述工作,证实该地区陡山沱组二段是一套具备生气潜力的白云质岩性组合。结合临近地质调查井秭地2井岩心资料及其测试分析数据,综合探讨了鄂西地区陡山沱组二段沉积特征、生烃条件和储层条件。认为该层段含气性受高演化程度的有机质丰度控制,依赖纳米级孔隙和微裂缝的吸附气是该常压层段页岩气的主要组成部分。

关键词: 页岩气, 资源潜力, 陡山沱组, 震旦系, 鄂西地区

Abstract:

With the first discovery of the world's oldest shale gas in Doushantuo Formation of the Lower Sinian in the southern wing of the Huangling anticline, the gas-bearing property of the dark shale has been confirmed. As the main gas-bearing shale bed, the second member of Doushantuo Formation has wide distribution, large sedimentary thickness and good shale quality. Based on the geological survey, and the layers division and characterization of the typical Early Sinian outcrop in Toudingshi Village, Sandouping Town, western Hubei, it is proved that the second member of Doushantuo Formation in this area is a set of dolomitic lithologic assemblage with potential for gas generation. Combined with the core data of the adjacent geological survey Well-ZD-2, the sedimentary characteristics, hydrocarbon generation and reservoir conditions are comprehensively discussed. Results show that the high evolutionary level of the kerogen controls the formation gas content. The adsorbed gas which depends on the Nanometer pores and micro-fractures, is the main component of shale gas in the normal formation pressure.

Key words: shale gas, resource potential, Doushantuo Formation, Sinian System, western Hubei

中图分类号:

TE132

李浩涵,包书景,张焱林,段轲,陈科,周志,宋腾,李飞. 鄂西地区下震旦统陡山沱组二段剖面特征及页岩气地质意义[J]. 油气藏评价与开发, 2022, 12(1): 171-180.

LI Haohan,BAO Shujing,ZHANG Yanlin,DUAN Ke,CHEN Ke,ZHOU Zhi,SONG Teng,LI Fei. Outcrop characteristics and shale gas geological significance of the second member in Doushantuo Formation of Lower Sinian in western Hubei[J]. Reservoir Evaluation and Development, 2022, 12(1): 171-180.

图/表 10

图1

图2

表1

头顶石剖面丈量数据"

序号	地层单元						分层描述	采样位置
序号	系	统	组	段	斜距（m）	真厚度（m）	分层描述	采样位置
25	震旦系	下统	陡山沱组	二段	4.50	1.20	为浅灰色中—厚层粉晶白云岩,可见磷质结核发育
24					5.50	1.40	为浅灰色中—厚层粉晶白云岩夹炭质页岩。该层发育小型正断层,错断23—24层, 断面产状210 °∠32 °,断面两侧岩层未见明显变形,断距约50 cm
23					8.00	2.30	灰黑色炭质页岩
22					19.00	5.40	深灰色薄—中层粉晶白云岩夹炭质页岩,前者单层厚度4~20 cm
21					17.50	5.00	灰黑色炭质页岩
20					2.50	0.70	深灰色中层状粉晶白云岩,单层厚度12~18 cm
19					7.00	2.00	灰黑色炭质页岩
18					14.00	4.00	深灰色中层状粉晶白云岩,单层厚度25~35 cm
17					10.00	1.60	灰黑色炭质页岩
16					9.00	1.50	深灰色薄层粉晶白云岩夹深灰色炭质泥质白云岩,前者单层厚度4~10cm	样品3
15					8.00	1.90	深灰色薄—中层粉晶白云岩、泥晶白云岩夹灰黑色碳质泥质白云岩,发育磷质结核
14					25.00	3.10	层岩性均为深灰色薄层泥质白云岩,单层厚度2~8 cm。根据磷质结核的发育程度,可细分为3层：0~8 m为14-1层（厚度1.2m）,8~11 m为14-2层（厚度0.4m）,11~22 m为14-3层（厚度1.6 m）。其中14-2层发育磷质结核,磷质结核长轴沿层面方向定向排列,砾径约1~2 cm,水平层理清晰可见
13					22.00	1.00	深灰色薄—中层泥质白云岩,单层厚度4~18 cm
12					50.00	4.60	深灰色薄层炭质泥质白云岩,单层厚度4~8 cm
11					27.00	2.30	深灰色薄—中层纹层状含炭泥-微晶白云岩,单层厚度5~15 cm	样品2
10					24.00	0.90	灰黑色薄层状炭质泥质白云岩,单层厚度2~6 cm
9					16.00	1.40	浅灰色薄—中层微晶白云岩与灰黑色炭质泥质白云岩互层。前者单层厚度6~18 cm
8					10.00	0.80	浅灰色炭质泥质白云岩
7					20.00	1.60	深灰色薄—中层粉晶白云岩夹炭质页岩。粉晶白云岩以中层为主,夹少量薄层,单层厚度8~20 cm
6					20.00	1.60	灰黑色炭质纹层状泥—微晶白云岩,单层厚度2~4 cm	样品1
5					29.50	4.60	深灰色中层状灰质白云岩夹炭质白云质页岩。前者单层厚度10~25 cm
4					6.00	1.50	为陡山沱组二段浅灰色薄层含黄铁矿含藻砂屑含灰质微晶白云岩,单层厚度2~8 cm
3				一段	4.50	1.40	浅灰色厚层粉晶白云岩,单层厚度大于70 cm, 含燧石条带
2					4.00	1.20	灰白色薄层粉晶白云岩、泥晶白云岩,单层厚度5~10 cm,水平层理发育
1					5.00	0.70	为陡山沱组一段浅灰色厚层块状含砾藻砂屑白云岩,砾石大小混杂,砾径在8~18 cm,分选较差,磨圆较差,岩层表面可见硅质纹层,砂屑白云岩单层厚度50~120 cm
平行不整合
0	南华系	上统	南沱组		18.00	2.50	为南沱组灰绿色块状含冰碛砾砂泥岩,中粗砂砾岩。粉砂砾岩,夹灰绿色块状冰碛含泥质粉砂砾岩。砾石含量较少,10 %以下,分选较差,2~25 cm不等,磨圆较好。

表1

图3

表2

图4

图5

图6

图7

图8

参考文献 22

[1]	董大忠, 邹才能, 李建忠, 等. 页岩气资源潜力与勘探开发前景[J]. 地质通报, 2011, 30(2-3):324-336.
	DONG Dazhong, ZOU Caineng, LI Jianzhong, et al. Resource potential, exploration and development prospect of shale gas in the whole world[J]. Geological Bulletin of China, 2011, 30(2-3):324-336.
[2]	董大忠, 程克明, 王玉满, 等. 中国上扬子区下古生界页岩气形成条件及特征[J]. 石油与天然气地质, 2010, 31(3):288-308.
	DONG Dazhong, CHENG Keming, WANG Yuman, et al. Forming conditions and characteristics of shale gas in the Lower Paleozoic of the Upper Yangtze region, China[J]. Oil & Gas Geology, 2010, 31(3):288-308.
[3]	邹才能, 杜金虎, 徐春春, 等. 四川盆地震旦系-寒武系特大型气田形成分布、资源潜力及勘探发现[J]. 石油勘探与开发, 2014, 41(3):278-293.
	ZOU Caineng, DU Jinhu, XU Chunchun, et al. Formation, distribution, resource potential and discovery of the Sinian-Cambrian giant gas field, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2014, 41(3):278-293.
[4]	刘树根, 孙玮, 罗立志, 等. 兴凯地裂运动与四川盆地下组合油气勘探[J]. 成都理工大学学报(自然科学版), 2013, 40(5):511-520.
	LIU Shugen, SUN Wei, LUO Lizhi, et al. Xingkai taphrogenesis and petroleum exploration from Upper Sinian to Cambrian Strata in Sichuan Basin, China[J]. Journal of Chengdu University of Technology(Science & Technology Edition), 2013, 40(5):511-520.
[5]	刘洪林, 王红岩, 刘人和, 等. 中国页岩气资源及其勘探潜力分析[J]. 地质学报, 2010, 84(9):1374-1378.
	LIU Honglin, WANG Hongyan, LIU Renhe, et al. China shale gas resources and prospect potential[J]. Acta Geologica Sinica, 2010, 84(9):1374-1378.
[6]	张金川, 姜生玲, 唐玄, 等. 我国页岩气富集类型及资源特点[J]. 天然气工业, 2009, 29(12):109-114.
	ZHANG Jinchuan, JIANG Shengling, TANG Xuan, et al. Accumulation types and resources characteristics of shale gas in China[J]. Natural Gas Industry, 2009, 29(12):109-114.
[7]	李忠权, 刘记, 李应, 等. 四川盆地震旦系-威远—安岳拉张侵蚀槽特征及形成演化[J]. 石油勘探与开发, 2015, 42(1):26-33.
	LI Zhongquan, LIU Ji, LI Ying, et al. Formation and evolution of Weiyuan-Anyue extension-erosion groove in Sinian system, Sichuan Basin[J]. Petroleum Exploration and Development, 2015, 42(1):26-33.
[8]	李双建, 高平, 黄博宇, 等. 四川盆地绵阳—长宁凹槽构造演化的沉积约束[J]. 石油与天然气地质, 2018, 39(5):889-898.
	LI Shuangjian, GAO Ping, HUANG Boyu, et al. Sedimentary constraints on the tectonic evolution of Mianyang-Changning trough in the Sichuan Basin[J]. Oil & Gas Geology, 2018, 39(5):889-898.
[9]	汪泽成, 赵文智, 胡素云, 等. 克拉通盆地构造分异对大油气田形成的控制作用—以四川盆地震旦系—三叠系为例[J]. 天然气工业, 2017, 37(1):9-23.
	WANG Zecheng, ZHAO Wenzhi, HU Suyun, et al. Control of tectonic differentiation on the formation of large oil and gas fields in craton basins: A case study of Sinian-Triassic of the Sichuan Basin[J]. Natural Gas Industry, 2017, 37(1):9-23.
[10]	赵文智, 魏国齐, 杨威, 等. 四川盆地万源—达州克拉通内裂陷的发现及勘探意义[J]. 石油勘探与开发, 2017, 44(5):659-669.
	ZHAO Wenzhi, WEI Guoqi, YANG Wei, et al. Discovery of Wanyuan-Dazhou intracratonic rift and its exploration significance in the Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2017, 44(5):659-669.
[11]	魏国齐, 杨威, 张健, 等. 四川盆地中部前震旦系裂谷及对上覆地层成藏的控制[J]. 石油勘探与开发, 2018, 45(2):179-189.
	WEI Guoqi, YANG Wei, ZHANG Jian, et al. The pre-Sinian rift in central Sichuan Basin and its control on hydrocarbon accumulation in the overlying strata[J]. Petroleum Exploration and Development, 2018, 45(2):179-189.
[12]	刘静江, 李伟, 张宝民, 等, 上扬子地区震旦纪沉积古地理[J]. 古地理学报, 2015, 17(6):735-753.
	LIU Jingjiang, LI Wei, ZHANG Baomin, et al. Sedimentary palaeogeography of the Sinian in Upper Yangtze Region[J]. Journal of Palaeogeography(Chinese Edition), 2015, 17(6):735-753.
[13]	汪泽成, 刘静江, 姜华, 等. 中—上扬子地区震旦纪陡山沱组沉积期岩相古地理及勘探意义[J]. 石油勘探与开发, 2019, 46(1):39-51.
	WANG Zecheng, LIU Jingjiang, JIANG Hua, et al. Lithofacies paleogeography and exploration significance of Sinian Doushantuo depositional stage in the middle-upper Yangtze region, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2019, 46(1):39-51.
[14]	李文正, 张建勇, 李浩涵, 等. 鄂西—渝东地区克拉通内裂陷分布特征及油气勘探意义[J]. 天然气地球科学, 2020, 31(5):675-685.
	LI Wenzheng, ZHANG Jianyong, LI Haohan, et al. Distribution characteristics of intracratonic rift and its exploration significance in western Hubei and eastern Chongqing area[J]. Natural Gas Geoscience, 2020, 31(5):675-685.
[15]	杨平, 谢渊, 李旭兵, 等. 雪峰山西侧震旦系陡山沱组烃源岩生烃潜力及油气地质意义[J]. 中国地质, 2012, 39(5):1299-1309.
	YANG Ping, XIE Yuan, LI Xubing, et al. Hydrocarbon-generating potential of the source rocks of the Sinian Doushantuo Formation on the western side of the Xuefeng Mountain[J]. Geology in China, 2012, 39(5):1299-1309.
[16]	李浩涵, 宋腾, 陈科, 等. 鄂西地区（秭地2井)震旦纪地层发现页岩气[J]. 中国地质, 2017, 44(4):812-813.
	LI Haohan, SONG Teng, CHEN Ke, et al. The discovery of shale gas from Sinian Formation at ZD-2 well in western Hubei[J]. Geology in China, 2017, 44(4):812-813.
[17]	翟刚毅, 包书景, 王玉芳, 等. 古隆起边缘成藏模式与湖北宜昌页岩气重大发现[J]. 地球学报, 2017, 38(4):441-447.
	ZHAI Gangyi, BAO Shujing, WANG Yufang, et al. Reservoir accumulation model at the edge of Palaeohigh and significant discovery of shale gas in Yichang Area, Hubei Province[J]. Acta Geoscientica Sinica, 2017, 38(4) : 441-447.
[18]	翟刚毅, 包书景, 庞飞, 等, 武陵山复杂构造区古生界海相油气实现重大突破[J]. 地球学报, 2016, 37(6):657-662.
	ZHAI Gangyi, BAO Shujing, PANG Fei, et al. Breakthrough of the natural gas of Paleozoic Marine Strata in Wuling Mountain complex tectonic zone[J]. Acta Geoscientica Sinica, 2016, 37(6):657-662.
[19]	翟刚毅, 王玉芳, 刘国恒, 等. 鄂西地区震旦系—寒武系页岩气成藏模式[J]. 地质力学学报, 2020, 26(5):696-711.
	ZHAI Gangyi, WANG Yufang, LIU Guoheng, et al. Accumulation model of the Sinian-Cambrian shale gas in western Hubei Province, China[J]. Journal of Geomechanics, 2020, 26(5):696-711.
[20]	李浩涵, 陈科, 包书景, 等. 鄂西黄陵背斜南翼震旦系陡山沱组有利目标区页岩气资源潜力评价. 石油实验地质, 2019, 41(1):31-37.
	LI Haohan, CHEN Ke, BAO Shujing, et al. Evaluation of shale gas resources of the Sinian Doushantuo Formation in the southern Huangling anticline, western Hubei Province[J]. Petroleum Geology & Experiment, 2019, 41(1):31-37.
[21]	单长安, 张廷山, 郭军杰, 等. 中扬子北部上震旦统陡山沱组地质特征及页岩气资源潜力分析[J]. 中国地质, 2015, 42(6):1944-1955.
	SHAN Changan, ZHANG Tingshan, GUO Junjie, et al. Geological characteristics and resource potential of the Upper Sinian Doushantuo Formation shale gas in the north of middle Yangtze region[J]. Geology in China, 2015, 42(6):1944-1955.
[22]	李旭兵, 陈绵琨, 刘安, 等. 雪峰山西侧埃迪卡拉系陡山沱组页岩气成藏体系评价[J]. 石油实验地质, 2014, 36(2):188-193.
	LI Xubing, CHEN Miankun, LIU An, et al. Evaluation of accumulation system for shale gas of Doushantuo Formation in western Xuefeng Mountain[J]. Petroleum Geology & Experiment, 2014, 36(2):188-193.

序号	岩石类型	总有机碳含量（%）	镜质体反射率（%）	腐泥组（%）		壳质组（%）		腐殖无定形（%）	镜质组（%）	惰质组（%）	类型指数	类型	渗透率（10^-3 μm²）	孔隙度（%）	岩石密度（g/cm³）	全岩定量分析（%）
序号	岩石类型	总有机碳含量（%）	镜质体反射率（%）	无定形	藻质体	孢粉体	其他	腐殖无定形（%）	镜质组（%）	惰质组（%）	类型指数	类型	渗透率（10^-3 μm²）	孔隙度（%）	岩石密度（g/cm³）	黏土总量	石英	钾长石	斜长石	方解石	白云石	黄铁矿	菱铁矿	石膏
1	纹层状含炭泥—微晶白云岩	0.43	3.24	74						26	48	Ⅱ₁	0.000 68	2.38	2.46	7	35			2	54	2
2	纹层状含炭泥—微晶白云岩	0.69	3.21	80						20	60	Ⅱ₁	0.000 95	1.16	2.56	1	28			4	67
3	纹层状含炭含粉砂微—泥晶白云岩	0.35	2.91	76						24	52	Ⅱ₁	0.000 76	2.73	2.49	3	28				69