Petroleum Exploration and Development >

2020 , Vol. 47 >Issue 3: 471 - 482

DOI: https://doi.org/10.1016/S1876-3804(20)60066-0

RESEARCH PAPER

Geological characteristics and development potential of transitional shale gas in the east margin of the Ordos Basin, NW China

  • Lichun KUANG ,
  • Dazhong DONG ,
  • Wenyuan HE ,
  • Shengming WEN ,
  • Shasha SUN ,
  • Shuxin LI ,
  • Zhen QIU ,
  • Xinwei LIAO ,
  • Yong LI ,
  • Jin WU ,
  • Leifu ZHANG ,
  • Zhensheng SHI ,
  • Wen GUO ,
  • Surong ZHANG
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  • 1. Science and Technology Management Department of China National Petroleum Corporation, Beijing 100007, China
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
    3. China Petroleum Consulting Center, Beijing 100724, China
    4. PetroChina Coalbed Methane Company Limited, Beijing 100028, China
    5. China University of Petroleum, Beijing 102249, China
    6. China University of Mining and Technology, Beijing 100083, China

Received date: 2019-12-26

  Revised date: 2020-03-20

  Online published: 2020-06-19

Supported by

China National Science and Technology Major Project(2017ZX05035);China National Science and Technology Major Project(2016ZX05041)

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Abstract

The shales in the 2nd Member of Shanxi Formation in the east margin of the Ordos Basin were deposited in a marine-nonmarine transitional environment during the Permian. Based on the recent breakthroughs in the shale gas exploration and theoretical understandings on the shale gas of the study area, with a comparison to marine shale gas in the Sichuan Basin and marine-nonmarine transitional shale gas in the U.S., this study presents the geological characteristics and development potential of marine-nonmarine transitional gas in the study area. Four geological features are identified in the 2nd Member of the Shanxi Formation in the study area has: (1) stable sedimentary environment is conductive to deposition of widely distributed organic shale; (2) well-developed micro- and nano- scale pore and fracture systems, providing good storage capacity; (3) high content of brittle minerals such as quartz, leading to effectively reservoir fracturing; and (4) moderate reservoir pressure and relatively high gas content, allowing efficient development of shale gas. The 2nd Member of Shanxi Formation in the east margin of Ordos Basin is rich in shale gas resource. Three favorable zones, Yulin-Linxian, Shiloubei-Daning-Jixian, and Hancheng-Huangling are developed, with a total area of 1.28×104 km2 and resources between 1.8×1012 and 2.9×1012m3, indicating a huge exploration potential. Tests of the 2nd Member of Shanxi Formation in vertical wells show that the favorable intervals have stable gas production and high reserves controlled by single well, good recoverability and fracability. This shale interval has sufficient energy, stable production capacity, and good development prospects, as evidenced by systematic well testing. The east margin of the Ordos Basin has several shale intervals in the Shanxi and Taiyuan formations, and several coal seams interbedded, so collaborative production of different types of natural gas in different intervals can be considered. The study results can provide reference for shale gas exploration and development and promote the rapid exploitation of shale gas in China.

Key words： shale gas; marine-nonmarine transitional shale; favorable area; collaborative production; Permian Shanxi Formation; Ordos Basin

Cite this article

Lichun KUANG , Dazhong DONG , Wenyuan HE , Shengming WEN , Shasha SUN , Shuxin LI , Zhen QIU , Xinwei LIAO , Yong LI , Jin WU , Leifu ZHANG , Zhensheng SHI , Wen GUO , Surong ZHANG . Geological characteristics and development potential of transitional shale gas in the east margin of the Ordos Basin, NW China[J]. Petroleum Exploration and Development, 2020 , 47(3) : 471 -482 . DOI: 10.1016/S1876-3804(20)60066-0

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