Shale Gas Exploration

Characteristics of normal-pressure shale gas reservoirs and evaluation of its favorable areas in Pengshui

  • Yongmin PENG ,
  • Shenxiang LONG ,
  • Xipeng HE ,
  • Jianxin TANG ,
  • Haikuan NIE ,
  • Yuqiao GAO ,
  • Gang XUE ,
  • Yudong FAN ,
  • Yulin LIU
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  • 1. Sinopec Petroleum exploration and Development Research Institute Co., Ltd, Beijing 100083, China
    2. Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China
    3. East China oil and gas branch of Sinopec, Nanjing 210019, Jiangsu, China
    4. Oil & Gas Survey of China Geological Survey, Beijing 100083, China

Received date: 2020-05-11

  Online published: 2020-09-24

Abstract

Based on geological, logging and experimental analysis data, normal-pressure shale gas reservoir of Upper Ordovician Wufeng Formation to Lower Silurian Longmaxi Member in Pengshui area has been researched by the established quantitative characterization method, and it is found that the reserving space of high-quality shale in ①—⑤ layers is mainly composed of organic pores and bedding joints. The arithmetic average aperture measured by FIB nanotechnology with higher resolution ranges is from 20 to 50 nm, being mainly mesopores. However, the volume weighted average aperture is 100 nm, being macropore. In terms of the measured pore volume, macropore is the main contributor to total volume and porosity. Core-scale fractures lead to the abrupt decrease or increase of gas logging and the migration of shale gas at layer-level. The new method, Maps, show that the bedding joints in layer① of well-Longye-1 are open and continuous with an opening width of 4.69 μm, and the opening width of bedding shear joint is 1.1~2.67 μm. The sum of plane porosity for bedding and bedding shear joints is 1.39 %, which accounts for about 1/3 of the total porosity of the sample. It confirms the important contribution of bedding fracture and natural tectonic fracture for shale gas reservoir spaces. Comparing with the overpressure shale gas reservoirs, the porosity of shale reservoir in normal-pressure area is slightly low, and the high-angle seam and bedding joints are more developed. A new parameters and criteria method for evaluating normal-pressure shale gas reservoirs has been established. By this method, favorable reservoir area of type I reservoir is of 620.22 km2 in layer ① to ⑤ of Wulong syncline.

Cite this article

Yongmin PENG , Shenxiang LONG , Xipeng HE , Jianxin TANG , Haikuan NIE , Yuqiao GAO , Gang XUE , Yudong FAN , Yulin LIU . Characteristics of normal-pressure shale gas reservoirs and evaluation of its favorable areas in Pengshui[J]. Petroleum Reservoir Evaluation and Development, 2020 , 10(5) : 12 -19 . DOI: 10.13809/j.cnki.cn32-1825/te.2020.05.002

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