The mudstone fractured oil and gas reservoir is a kind of special unconventional reservoirs and its hydrocarbon mainly exists in fractures. This kind of reservoirs has industrial exploitation value due to the large reserves

but the complex geological condition leads to its poor develop effects. In order to reconstruct the geological condition and analyze the production capacity of the mudstone fractured oil and gas reservoir before fracturing

the core characteristics

downhole microseismic and dynamic information of production are fully considered. According to the characteristics and production of the development layer with mudstone fractures in Daqing area

and combined with the seismic and other structural research results

we established the fracture network model

which was constrained by the crack strength attribute. Based on the network model

the coupling model of the artificial fracture and natural fracture is established

so that to analyze the effect before and after fracturing. The results show that the fractured model can accurately describe the numbers and direction of the natural fractures

and estimate the oil and gas production before and after fracturing. The study is used as a method for evaluating the productivity of mudstone fractured oil and gas reservoirs in area A of Daqing

and to provide the basis for the fracturing construction of other wells in this zone.