鄂西宜昌地区下古生界五峰组-龙马溪组页岩气储层发育特征与勘探潜力

doi:10.11743/ogg20210110

石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (1): 107-123.doi: 10.11743/ogg20210110

鄂西宜昌地区下古生界五峰组-龙马溪组页岩气储层发育特征与勘探潜力

蔡全升^1,²(), 陈孝红^2,*(), 张国涛², 张保民², 韩京³, 陈琳², 李培军², 李炎桂⁴

1. 长江大学地球科学学院, 湖北武汉 430100
2. 中国地质调查局武汉地质调查中心, 湖北武汉 434025
3. 中国石化勘探分公司勘探研究院, 四川成都 610041
4. 中国地质科学院, 北京 100037

收稿日期:2019-05-22 出版日期:2021-02-28 发布日期:2021-02-07
通讯作者: 陈孝红 E-mail:cqsh0713@163.com;yccxiaohong@163.com
作者简介:蔡全升(1988-), 男, 博士、助理研究员, 沉积地质学。E-mail: cqsh0713@163.com
基金资助:
中国地质调查局项目(DD20179615);国家科技重大专项(2016ZX05034001-002);湖北省自然科学基金项目(2018CFB330)

Characteristics and exploration potential of the Wufeng-Longmaxi shale gas reservoirs of Lower Paleozoic in Yichang area, western Hubei Province, China

Quansheng Cai^1,²(), Xiaohong Chen^2,*(), Guotao Zhang², Baomin Zhang², Jing Han³, Lin Chen², Peijun Li², Yangui Li⁴

1. School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China
2. Wuhan Institute of Geology and Mineral Resources, China Geological Survey, Wuhan, Hubei 434025, China
3. Research Institute of SINOPEC Petroleum Exploration Branch Company Ltd., Chengdu, Sichuan 610041, China
4. Chinese Academy of Geological Sciences, Beijing 100037, China

Received:2019-05-22 Online:2021-02-28 Published:2021-02-07
Contact: Xiaohong Chen E-mail:cqsh0713@163.com;yccxiaohong@163.com

摘要/Abstract

摘要：

近年来，鄂西宜昌地区上奥陶统五峰组-下志留统龙马溪组页岩气勘探取得了一系列重要发现和突破。为进一步明确该区五峰组-龙马溪组页岩气勘探潜力，文章在前人研究的基础上，利用钻井及野外露头资料，结合地震、测井和分析测试数据，对宜昌地区五峰组-龙马溪组页岩气储层发育特征、优质储层分布及勘探潜力等进行了深入研究。结果表明，宜昌地区五峰组-龙马溪组下部黑色富有机质页岩储层岩石类型丰富，普遍具有高硅(石英平均含量>50%)、高碳(TOC平均为2.47%)、高成熟度(R_o普遍大于2%)、低孔(普遍低于5%)和特低渗(平均为0.19×10^-3 μm²)特征，储层含气性较好，平均含气量超过2.0 m³/t。优质储层主要集中在五峰组和龙马溪组黑色页岩下部，对应于凯迪阶WF2-WF3笔石带和鲁丹阶LM2-LM3笔石带，厚度约11 m，与四川焦石坝和长宁地区相比，该区优质储层厚度偏薄。最后通过保存条件和经济性评价分析，认为鄂西宜昌东部斜坡区五峰组-龙马溪组页岩气保存条件相对较好，埋藏较浅，地质资源量超过1 200×10⁸ m³，具有良好的勘探潜力。

关键词: 勘探潜力, 页岩气, 储层特征, 五峰组, 龙马溪组, 宜昌地区

Abstract:

During the past few years, several shale gas discoveries were made in the Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation in Yichang of western Hubei Province, China.The shale gas potential of the formations was then explored by combining the previous studies with updated analyses of drilling data and outcrops, geophysical information and testing results.A summary of the development characteristics, reservoir distribution and resource potential of the formations shows that the targeted dark, organic-rich rocks at the lower part of the formations have high quartz content (more than 50% on average) and TOC(2.47% on average), and high maturity (R_o of more than 2% in general), low porosity (less than 5% in general), extra-low permeability (0.19×10^-3 μm² on average), and relatively high gas content (2.0 m³/t on average).Quality reservoirs are mostly distributed in the lower part (about 11 m thick) of the black rocks and can be corresponded to the WF2-WF3 Katian graptolite zone and LM2-LM3 Rhuddanian graptolite zone.The reservoirs are thinner than high-quality reservoirs in Jiaoshiba and Changning areas, Sichuan Province.However, judging by their preservation conditions and economy, we propose that the rocks in the slope of eastern Yichang with their shallower burial depth, relatively better preservation conditions as well as a geological reserve of over 1 200×10⁸ m³, are worthy of further exploration.

Key words: exploration potential, shale gas, reservoir characteristics, Wufeng Formation, Longmaxi Formation, Yichang area

中图分类号:

TE122.2

蔡全升,陈孝红,张国涛,等. 鄂西宜昌地区下古生界五峰组-龙马溪组页岩气储层发育特征与勘探潜力[J]. 石油与天然气地质, 2021, 42(1): 107-123. doi: 10.11743/ogg20210110 Quansheng Cai,Xiaohong Chen,Guotao Zhang,et al. Characteristics and exploration potential of the Wufeng-Longmaxi shale gas reservoirs of Lower Paleozoic in Yichang area, western Hubei Province, China[J]. Oil & Gas Geology, 2021, 42(1): 107-123. doi: 10.11743/ogg20210110

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地层			矿物含量/%
地层			石英	长石	碳酸盐矿物	粘土矿物
统	组	阶	最小~最大	最小~最大	最小~最大	最小~最大
统	组	阶	平均	平均	平均	平均
下志留统	龙马溪组	埃隆阶	18.26~68.83	3.14~18.13	0~16.19	7.54~75.13
		埃隆阶	40.41	7.62	3.23	45.84
		鲁丹阶	44.45~93.78	1.74~15.6	0~5.46	0~46.28
		鲁丹阶	72.26	8.43	1.43	18.31
上奥陶统	五峰组	赫南特阶	42.5~86.01	4.17~11.85	0~8.13	9.82~32.67
		赫南特阶	68.43	7.79	2.25	20.45
		凯迪阶	34.56~100	0~11.62	0~4.28	0~53.12
		凯迪阶	73.54	5.74	1.56	19.46

剖面位置	层位	样品个数	地层TOC/%
剖面位置	层位	样品个数	分布范围	平均值
鄂宜页2井	五峰组-龙马溪组	30	0.32~5.53	2.41
鄂宜页3井	五峰组-龙马溪组	16	0.36~5.13	2.15
荷花横石	龙马溪组	18	0.93~6.38	2.90

储层品质	TOC/%	脆性指数/%	含气性/(m³·t^-1)	沉积环境
Ⅰ类(优质储层)	>2.5	>50	>2	深水硅质陆棚
Ⅱ类(次优储层)	1.5~2.5	40~50	1~2	深水泥质陆棚
Ⅲ类(差储层)	0.5~1.5	30~40	0.5~1	深/浅水泥质陆棚
Ⅳ类(非储层)	< 0.5	< 30	< 0.5	浅水泥质陆棚

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鄂西宜昌地区下古生界五峰组-龙马溪组页岩气储层发育特征与勘探潜力

Characteristics and exploration potential of the Wufeng-Longmaxi shale gas reservoirs of Lower Paleozoic in Yichang area, western Hubei Province, China

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