大巴山北缘下寒武统页岩沉积特征及有利相带分析——以紫阳毛坝剖面为例

doi:10.13809/j.cnki.cn32-1825/te.2022.01.009

油气藏评价与开发 ›› 2022, Vol. 12 ›› Issue (1): 107-118.doi: 10.13809/j.cnki.cn32-1825/te.2022.01.009

大巴山北缘下寒武统页岩沉积特征及有利相带分析——以紫阳毛坝剖面为例

张烨^1,²(),余川^1,²(),张志平^1,²,韦国栋³,张华莲^1,²

1.页岩气勘探开发国家地方联合工程研究中心（重庆地质矿产研究院）,重庆401120
2.自然资源部页岩气资源勘查重点实验室（重庆地质矿产研究院）,重庆401120
3.西南石油大学地球科学与技术学院,四川成都610500

收稿日期:2021-03-22 发布日期:2022-03-24 出版日期:2022-02-26
通讯作者: 余川 E-mail:zhangye_sg@vip.163.com;yuchuan03041512@aliyun.com
作者简介:张烨（1976—）,男,博士,正高级工程师,主要研究方向为非常规油气勘探开发技术研究。地址：重庆市渝北区兰馨大道111号,邮政编码：401120。E-mail： zhangye_sg@vip.163.com
基金资助:
重庆市规划和自然资源局科技项目“页岩气开发地质稳定性安全评价与控制技术研究”(KJ-20200041)

Sedimentary characteristics and favorable facies of Lower Cambrian Shale in the northern margin of Mount Daba: A case study of Maoba Outcrop in Ziyang

ZHANG Ye^1,²(),YU Chuan^1,²(),ZHANG Zhiping^1,²,WEI Guodong³,ZHANG Hualian^1,²

1. National Joint Engineering Research Center for Shale Gas Exploration and Development, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
2. Key Laboratory of Shale Gas Exploration, Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China
3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2021-03-22 Online:2022-03-24 Published:2022-02-26
Contact: YU Chuan E-mail:zhangye_sg@vip.163.com;yuchuan03041512@aliyun.com

摘要/Abstract

摘要：

大巴山北缘下寒武统页岩气钻探显示良好,具有较好的勘探前景。该区下寒武统普遍发育了一套暗色页岩层系,但地层非均质性较强,区域上沉积相变较大。对该区下寒武统页岩沉积特征进行研究,分析其对有机质差异富集的影响,有助于进一步的勘探开发工作。以紫阳毛坝露头剖面及其实验测试资料为基础,从沉积相划分与对比、沉积模式分析、有利沉积相带分析等3个方面开展研究。将研究区下寒武统划分为次深海裂陷槽盆相、深水陆棚相、浅水陆棚相、台地边缘斜坡相4类沉积亚相;纵向上,水体由深变浅,碳质、硅质含量逐渐降低,黏土质、碳酸盐含量逐渐增高。研究区岚皋—镇坪地层小区下寒武统鲁家坪组下部深水陆棚相发育的暗色泥页岩,厚度大,总有机碳和脆性矿物含量均较高,是优质页岩发育的有利沉积相带。

关键词: 大巴山北缘, 下寒武统, 沉积模式, 页岩气, 差异富集

Abstract:

The drilling of Lower Cambrian shale gas in the northern margin of Mount Daba shows good prospect. A set of dark shale strata are generally developed in the lower Cambrian in this area, but the stratigraphic heterogeneity is strong, and the sedimentary facies change obviously in the region. It is helpful for the further exploration and development to the study shale sedimentary characteristics of the Lower Cambrian in this area and analyze its influence on the differential enrichment of organic matter. On the basis of outcrop section in Maoba of Ziyang and experimental data, the researches are carried out from three aspects: the division and correlation of sedimentary facies, the analysis of sedimentary mode and the analysis of favorable sedimentary facies zones. The Lower Cambrian in the study area can be divided into four sedimentary subfacies: sub abyssal rifting trough basin facies, deep water shelf facies, shallow water shelf facies, and platform edge slope facies. Longitudinally, the water body changes from deep to shallow, and the contents of carbonaceous and siliceous gradually decrease, while the contents of clayey and carbonate gradually increase. The dark mud shale developed in the lower Cambrian Lujiaping Formation deep water shelf facies in Langao-Zhenping stratigraphic district has the larger thickness and higher content of total organic carbon and brittle minerals, which is a favorable sedimentary facies belt for the development of high-quality shale.

Key words: northern margin of Mount Daba, Lower Cambrian, sedimentary mode, shale gas, differential enrichment

中图分类号:

TE122

张烨,余川,张志平等. 大巴山北缘下寒武统页岩沉积特征及有利相带分析——以紫阳毛坝剖面为例[J]. 油气藏评价与开发, 2022, 12(1): 107-118.

Ye ZHANG,Chuan YU,Zhiping ZHANG, et al. Sedimentary characteristics and favorable facies of Lower Cambrian Shale in the northern margin of Mount Daba: A case study of Maoba Outcrop in Ziyang[J]. Reservoir Evaluation and Development, 2022, 12(1): 107-118.

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沉积相类型	主要沉积岩性	发育厚度（m）	有机碳（%）	成熟度（%）	孔隙度（%）	渗透率（10^-3μm²）	脆性矿物（%）	黏土矿物（%）
次深海裂陷槽盆	深灰—灰黑色含碳硅质页岩夹灰质白云岩	28~110	0.8~1.5	2.5~4.1	0.5~1.2	0.002~0..008	70~85	7~15
深水陆棚	黑色碳质页岩夹硅质岩	130~290	2.2~9.6	2.4~3.9	0.7~1.9	0.002~0.015	50~63	10~26
浅水陆棚	深灰—灰黑色含碳粉砂质页岩	158~360	0.5~1.8	2.1~4.0	0.8~1.6	0.003~0.010	32~53	15~33
台地边缘	灰色灰质页岩、泥灰岩	112~195	0.2~0.7	2.2~3.8	0.6~2.1	0.003~0.016	25~41	14~35

大巴山北缘下寒武统页岩沉积特征及有利相带分析——以紫阳毛坝剖面为例

Sedimentary characteristics and favorable facies of Lower Cambrian Shale in the northern margin of Mount Daba: A case study of Maoba Outcrop in Ziyang

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