黔北地区下寒武统黑色页岩沉积特征及页岩气意义

Sedimentary characteristics and shale gas significance of Lower Cambrian black shale in Qianbei Area

 梁超 姜在兴 郭岭 杨镱婷

中国地质大学（北京）能源学院，北京 100083

School of Energy Resources, China University of Geosciences, Beijing 100083, China

以沉积学、层序地层学、石油天然气地质学为理论基础，以野外实测剖面分析、地化元素分析、薄片观察等为手段，采用“点—线—面”三位一体的方法，对黔北地区沉积特征进行分析。黔北地区下寒武统牛蹄塘组沉积环境为浅海沉积，主要沉积体系类型有浅水陆棚和深水陆棚。古地貌整体为西北高、东南低的特点，物源区主要来自研究区西北部，少量来自西南部。下寒武统黑色页岩普遍发育，厚度在工区东南部最大，可达200 m。宏观上的黑色页岩广泛发育、厚度大、颜色深，微观上富含有机质且硅质质量分数较高。结合宏观、微观2方面，认为工区东南部为页岩气勘探重点区域。

 On the theoretical basis of sedimentology, sequence stratigraphy, oil and gas geology, to the analysis of measured field profiles, geochemical elements and microscopically slice observation as the means, and using the trinity method of point- line- face, this article analyzes the sedimentary characteristics of Qianbei Area. The sedimentary environment of Lower Cambrian Niutitang Formation is shelf deposition and the main sedimentary systems include shallow shelf and deepwater shelf. Overall, the paleogeomorphology has the characteristics of high in northwest and low in southeast. Provenances come mainly from the northwest and a few from the southwest in research area. The Lower Cambrian black shale develops widely. The thickness of the black shale is biggest in southeast area, reaching 200 m. From macroscopic view, the black shale extensively develops, the thickness is very large and its color is pure. From microscopic view, the black shale gas is rich in organic matter and the microscopic silicon content is high. Combined with the macro and micro respects, it is considered that the southeast area is the key area for shale gas exploration.

10.6056/dkyqt201201005