Oil & Gas Geology ›› 2013, Vol. 34 ›› Issue (2): 274-280.doi: 10.11743/ogg20130221

Previous Articles    

Exploration potential of shale gas in Cen'gong block,southeastern Guizhou province

Nie Yongsheng1, Leng Jigao2, Han Jianhui3, Sun Li1, Shen Chungui4   

  1. 1. Institute of Sedimentary Geology, Chengdu, University of Technology, Chengdu, Sichuan 610059, China;
    2. China Energy Reserve Corporation, Beijing 100107, China;
    3. College of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    4. Qinghai Institue of Environment Geological Survey, Xining, Qinghai 810007, China
  • Received:2012-03-19 Revised:2013-03-16 Online:2013-04-28 Published:2013-05-02

Abstract:

The shale gas resources are rich in the Upper Yangtze platform,especially the Lower Cambrian Niutitang Formation.Cen'gong shale gas block is located within the Niutitang shale gas play on the Upper Yangtze platform.This paper systematically studied the structure,source rocks and reservoirs characteristics of the Niutitang Formation in Cen'gong block through stratigraphic correlation,laboratory test of reservoir rock sample and geochemical analysis of source rock samples and in combination with previous study results.The distribution of Niutitang Formation,reservoir physical property and thickness of source rocks were mapped.Further more,the resource volume of shale gas was calculated by using the gas content data obtained from testing in well Cenye 1 that the following results were obtained.The organic matters of the Niutitang Formation are mainly of typeⅠand typeⅡ1.The average organic matter content of the source rock is as high as 3.38%.The average Ro is calculated to be 3.56%,which reflects the source rock has entered high maturation stage.The reservoirs are characterized by low porosity-ultralow permeability and large specific surface area.The recoverable resource volume of shale gas is estimated at 7.19 billion cubic meters.The Minhe,Yangqiao and Daping areas of the Cen'gong block can be selected as favorable shale gas play fairways for further exploration and evaluation.

Key words: geological characteristics, shale gas, Niutitang Formation, Cen'gong block, southeastern Guizhou province, Upper Yangtze platform

CLC Number: