Earth Science Frontiers ›› 2016, Vol. 23 ›› Issue (2): 29-38.DOI: 10.13745/j.esf.2016.02.004

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Analyses on the shale gas exploration prospect of the Niutitang Formation in northeastern Guizhou Area.

  

  • Received:2015-09-15 Revised:2015-11-09 Online:2016-03-15 Published:2016-03-15

Abstract:

The shale gas resources are rich in the northeastern Guizhou area, especially in the Niutitang Formation. Based on the former failed drilling wells, combined with abundant analytical data of outcrops and cores, this study systematically investigated the geological characters of the Niutitang Formation in the northeastern Guizhou area and further implemented the resource potential in the study area. The following understandings are obtained. The kerogen types of organic matter are mainly of typeⅠand typeⅡ1, of the Niutitang Formation in the northeastern Guizhou area. The TOC content is high, with an average value of 3.52%. The average value of Ro is 3.58%, which reflects that the source rock has entered high maturation stage. The reservoirs are characterized by low porosityultralow permeability and high specific surface area. The results show that the brittle and clay minerals are averaged at 64.2% and 19.6%, respectively. The high siliceous contents and great brittleness is favorable for reservoir alteration. The recoverable resource of shale gas is estimated at 0.12 billion cubic meters. Areas including Cen gong, Yanhe, Xiushan, Dejiang, Kaili, etc. can be selected for further exploration and evaluation in the northeastern Guizhou area.

Key words: shale gas, exploration prospect, Niutitang Formation, northeastern Guizhou Area, Upper Yangtze platform

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