Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 29-39.doi: 10.12108/yxyqc.20180504

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Gas-bearing property and main controlling factors of Lower Cambrian shale in complex tectonic area of northwestern Hunan province: a case of well Ciye 1

MENG Fanyang1, CHEN Ke1, BAO Shujing1, LI Haohan1, ZHANG Cong1,2, WANG Jinzhu1   

  1. 1. Oil & Gas Survey, China Geological Survey, Beijing 100083, China;
    2. Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100029, China
  • Received:2017-09-10 Revised:2017-10-19 Online:2018-09-14 Published:2018-09-14

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Abstract: The lower Cambrian marine shales with large thickness and high organic content are widely developed in southern China,however the main controlling factors affecting shale gas-bearing property are still not clear. The shale of the Lower Cambrian Niutitang Formation in the complex tectonic area of northwestern Hunan province has a large thickness and medium depth,and the shale gas parameter well Ciye 1,which was drilled in the selected Cili Jinglongqiao syncline,has a thick shale thickness of 149 m. The core samples were taken to analyze total organic carbon(TOC) content,vitrinite reflectance,mineral composition and reservoir properties,revealing that the average TOC content of Niutitang Formation is 4.83%,the bottom high quality shale with TOC content more than 3% has a thickness of 37 m,and the average vitrinite reflectance of shale is 3.28%. The total shale gas content of Niutitang Formation measured by core direct desorption method reaches 0.859 m3/t,and the average methane content in natural gas composition is 78.23%. By analyzing the tectonic evolution characteristics of Cili area in northwestern Hunan,and comparing the key parameters of the Lower Cambrian shale in the surrounding drilling wells with well Ciye 1,the main controlling factors affecting the gas-bearing property of the Lower Cambrian shale in northwestern Hunan are tectonic preservation conditions and shale evolution degree. The palaeo uplifts in southern China such as Xuefeng uplift,Huangling anticline and Hannan old land with stable basement, good preservation conditions and low shale maturity,are the key areas for the further shale gas exploration in complex tectonic areas.

Key words: shale gas, gas-bearing property, controlling factors, Lower Cambrian, northwestern Hunan province

CLC Number: 

  • TE121
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