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吴 松,胡忠贵,邱小松,等. 鄂东通山地区下寒武统牛蹄塘组富有机质页岩矿物组成及意义[J]. 科学技术与工程, 2020, 20(29): 11867-11874.
WU Song,Qiu Xiao-song,et al.Mineral Composition and it’s Significance of Organic-rich Shale of Lower Cambrian Niutitang Formation in Tongshan Area, Eastern Hubei[J].Science Technology and Engineering,2020,20(29):11867-11874.
鄂东通山地区下寒武统牛蹄塘组富有机质页岩矿物组成及意义
Mineral Composition and it’s Significance of Organic-rich Shale of Lower Cambrian Niutitang Formation in Tongshan Area, Eastern Hubei
投稿时间:2019-08-29  修订日期:2020-06-25
DOI:
中文关键词:  页岩气  中扬子地区 鄂东地区  牛蹄塘组 矿物特征
英文关键词:shale  gas middle  yangtze area  eastern hubei  area niutitang  formation mineral  characteristics
基金项目:湖北省教育厅科学技术研究计划重点项目(D20171302);十三五国家科技重大专项(2016ZX05007002);大学生创新创业训练计划项目(2018016)
                 
作者单位
吴 松 长江大学油气资源与勘探技术教育部重点实验室&
长江大学地球科学学院
胡忠贵 长江大学油气资源与勘探技术教育部重点实验室&
长江大学地球科学学院
邱小松 中国石油勘探开发研究院
李世临 中石油西南油气田公司重庆气矿
李胡蝶 长江大学地球科学学院
刘淑芬 长江大学地球科学学院
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中文摘要:
      中扬子作为南方重要页岩气资源勘探开发接替区,正逐渐成为研究的热点,但不同地区、不同层系认识程度不一。为了对研究程度较低的鄂东通山地区下寒武统牛蹄塘组富有机质泥页岩的沉积及矿物特征的初步认识,为该区页岩气的进一步勘查研究与评价提供指导。通过野外实测界水岭和珍珠口剖面并选取露头样品进行X射线衍射分析,结果表明:通山地区下寒武统牛蹄塘组矿物成分较为复杂、类型多样,石英含量最高,含量为31.9%~47.2%,平均42.1%,黏土矿物含量在18.3%~21.9%之间,平均20.6%,酸盐岩矿物中以方解石含量变化最大,含量在1.3%~27.5%之间,平均值为15.1%;长石平均含量为12.0%,主要成分为斜长石,微晶矿物石膏在样品中普遍存在;黏土矿物主要成分为伊利石,平均含量达63.9%,其次为绿泥石和伊/蒙混层,只有或者极少含量的高岭石,不含蒙脱石,沉积及埋藏成岩过程中水介质沉积总体处于缺氧的还原环境,已进入晚成岩阶段;脆性矿物含量在62.3%~76.3%之间,平均69.73%,脆性指数在0.74~0.81之间,平均0.77,脆性指数与脆性矿物含量有着很好的对应性;矿物组成及含量与周边及北美、威远、涪陵页岩气田有着很好的对比性,参考北美及焦页1井储层优选条件,认为研究区下寒武统牛蹄塘组具备页岩气藏的形成和保存的基础地质条件,有着很好的可压裂性,具备一定的开采潜力。
英文摘要:
      Middle Yangtze area, as the important replacement area about shale gas exploration and development in In southern China, is gradually becoming a research hot-spot. however, Have different research levels in different regions and strata. In order to have a preliminary understanding about sedimentary and mineral characteristics of the Lower Cambrian Niutitang Formation organic-rich shale, which research level is low relatively in the Tongdong area ,so provide a guidance for further exploration and evaluation of shale gas in this area. Selected outcrop samples for X-ray diffraction analysis from survey Jieshuiling and jieshuoling profiles. The results showed that the mineral composition of the Lower Cambrian Niutitang Formation in Tongshan area is complex and diverse, with the highest quartz content, between 31.9%~47.2%, average 42.1%, and clay mineral content between 18.3%~21.9%, average 20.6. %, the calcite content is varies the most in the acid rock minerals, the content is between 1.3% ~ 27.5%, the average value is 15.1%; the average content of feldspar is 12.0%, the main component is plagioclase, the gypsum of microcrystalline mineral is ubiquitous in samples; the main component of clay minerals is illite, with an average content of 63.9%, followed by chlorite and yum mixed layer, only a few kaolinite and no montmorillonite in these samples, it indicates that the sediments in the sedimentary and burial diagenesis are generally in hypoxic reduction climate, and have entered the late diagenetic stage. The brittle mineral content is 62.3%~76.3%, with an average is 69.73%, and the brittleness index is 0.74 ~0.81, with an average is 0.77, the brittleness index has a good correspondence with the brittle mineral content; The mineral composition and content are in good contrast with the surrounding shale gas fields and North American, Weiyuan and Fuling. Refer to the optimal conditions of shale gas reservoirs in North America and Jiaoye 1 well, Conclusion can be reach that the Lower Cambrian Niutitang Formation in the study area has the basic geological conditions for the formation and preservation of shale gas reservoirs, It has a good fractureability and has has the potential to exploit in some extent.
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