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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第42卷

期数:

2020年第03期

页码:

329-341

栏目:

基础地质与矿产地质

出版日期:

2020-05-15

文章信息/Info

Title:

Geological Conditions and Exploration Potential of Lower Cambrian Niutitang Formation Marine-facies Shale Gas in the Northern Margin of Upper Yangtze Platform, China

文章编号:

1672-6561(2020)03-0329-13

作者:

王宁¹; 许锋¹; 王喆¹; 段俊²; 李华兵¹; 高骏¹; 谢青¹

(1. 陕西省地质调查院 陕西省矿产地质调查中心,陕西 西安 710068; 2. 长安大学 地球科学与资源学院,陕西 西安 710054)

Author(s):

WANG Ning¹;  XU Feng¹;  WANG Zhe¹;  DUAN Jun²;  LI Hua-bing¹;  GAO Jun¹;  XIE Qing¹

(1. Shaanxi Mineral Resources and Geological Survey, Shaanxi Institute of Geological Survey, Xi'an 710068, Shaanxi, China; 2. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China)

关键词:

页岩;  勘探潜力;  下寒武统;  牛蹄塘组;  海相;  储层;  含气性;  上扬子地台

Keywords:

shale;  exploration potential;  Lower Cambrian;  Niutitang Formation;  marine facies;  reservoir;  gas-bearing;  Upper Yangtze platform

分类号:

P618.13; P624

DOI:

10.19814/j.jese.2019.11020

文献标志码:

A

摘要:

基于野外露头和钻井岩芯采样分析,对上扬子地台北缘下寒武统牛蹄塘组黑色页岩分布特征、地球化学特征、储层特征、含气性特征及顶底板条件等进行系统研究,并与中国南方地区下寒武统海相页岩展开对比分析,明确页岩气成藏地质条件和勘探潜力。结果表明:上扬子地台北缘下寒武统牛蹄塘组页岩发育且厚度大,具有“四高一中”特点,即高脆性、高总有机碳、高孔隙度、高含气量、适中热演化程度,显示良好的页岩气形成地质条件; 相比中国南方地区下寒武统海相页岩,上扬子地台北缘牛蹄塘组页岩具备足够的生烃物质基础和较高的脆性,并且富有机质页岩厚度大,热演化程度低,孔隙度和含气量高,勘探效果较好; 综合考虑优质页岩的厚度、埋深、保存等条件,认为回军坝—麻柳镇一带是上扬子地台北缘牛蹄塘组海相页岩气下一步勘探的最有利地区。

Abstract:

Based on the analysis results of field outcrops and drilling cores, the Lower Cambrian Niutitang Formation black shale in the northern margin of Upper Yangtze platform was systematically studied and compared with the strata in southern China, including the characteristics of distribution, geochemistry, reservoir, gas-bearing and the conditions of roof and floor. Then, the geological conditions and exploration potential of shale gas accumulation were clarified. The results show that the shale is developed with large thickness and characteristics of high brittleness, high TOC, high porosity, high gas content and moderate thermal evolution, showing good conditions for shale gas development; compared with Lower Cambrian marine-facies shales in southern China, the Niutitang Formation shale in the northern margin of Upper Yangtze platform has quite sufficient hydrocarbon-generating materials and high brittleness, but thicker shale, lower thermal evolution, higher gas contents and porosity, indicating better prospects for shale gas exploration; considering the thickness, depth and preservation conditions of good quality shale comprehensively, the Huijunba-Maliuzhen area is the favorable exploration for the marine-facies shale gas of Niutitang Formation in the northern margin of Upper Yangtze platform.

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备注/Memo

备注/Memo:

收稿日期:2019-11-14; 修回日期:2020-03-17; 网络首发日期:2020-05-07投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(41802081); 陕西省公益性地质项目(20170104)
作者简介:王 宁(1990-),女,河北高碑店人,助理工程师,E-mail:15991982877@163.com。

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更新日期/Last Update: 2020-05-27