Reservoir Evaluation and Development ›› 2020, Vol. 10 ›› Issue (1): 43-48.doi: 10.13809/j.cnki.cn32-1825/te.2020.01.007

• Method and Theory • Previous Articles     Next Articles

Microseismic monitoring technology of shale gas block in the southern part of Pingqiao

HUANG Xiaozhen1,GU Hongtao2   

  1. 1. Research Institute of Exploration and Development, Sinopec East China Oil and Gas Company, Nanjing, Jiangsu 210011, China
    2. Nanchuan Shale Gas Project Department, Sinopec East China Oil and Gas Company, Chongqing 408400, China
  • Received:2019-03-01 Online:2020-02-26 Published:2020-02-04

Abstract:

How to accurately describe the distribution state of fractures formed by hydraulic fracturing in horizontal wells, the volume of reservoir transformation and the main control factors of fracture formation is one of the key technologies in shale gas development. Microseismic monitoring in the 10th to 15th fracturing section of shale gas well JY×-1 in the south of Pingqiao is carried out by means of devolving high precision geophone in adjacent well JY×-2. According to the monitoring results, the fracture development of each section of fracturing is described, and the distribution characteristics of fractures in six sections after fracturing. The main fractures are artificial fractures, whose half length is 250 m, width is 210 m, and height is 85 m. The stimulated reservoir volume(SRV) is 2 187×10 4 m 3. There is a certain coincidence in the single fracturing section. The main fracture direction is 60° north of east, which is basically consistent with the direction of the maximum principal stress. Fracturing barrier is the main factor of fracture asymmetry development. Combined with the analysis of 3D seismic curvature attribute, it is considered that the natural closed fracture in the reservoir is the barrier of micro-fracture extension, which affects the extension direction and length of micro-fracture, and also leads to the increase of construction pressure.

Key words: shale gas of the southern part of Pingqiao, microseismic monitoring, hydraulic fracturing of horizontal well, fracturing barrier, microfracture by fracturing

CLC Number: 

  • TE357