Nanchuan Block is rich in shale gas resources

and the proven reserves of Pingqiao and Dongsheng structural belts are nearly 2 000×10

8

m

3

mainly in normal pressure shale gas reservoir

with complex structure and stress

and relatively poor resource quality. Affected by the preservation conditions

burial depth

in-situ stress

complex structure

uneven fracture development and fracturing effect

the productivity of single wells on the same platform is quite different

and the test production

productivity and single well EUR of some wells have not been able to meet the expectation

all t

hese above greatly limit the scale production and benefit development. By the comparative analysis of production effects of typical wells in geology

development and engineering

it is considered that formation pressure coefficient

development degree of natural fracture network

local complex structure and in-situ stress are the main factors affecting normal pressure shale gas development in resource implementation area. The pressure coefficient represents the driving energy of the formation

and a certain degree of natural fracture network can effectively improve the development effects. The local complex structure leads to a low drilling rate of high-quality shale

and the stress increase caused by extrusion deformation

deepening burial depth and excessive angle between horizontal section azimuth and minimum principal stress azimuth will limit the complexity of artificial fracture network to a certain extent. According to the plane difference distribution characteristics of main controlling factors

the basis of improving the development effects of normal pressure shale gas is to select the best from sweet spot and adjust the local optimization.