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 i

s 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.