Efficient development of Zhongjiang gas reservoir is faced with four difficulties: the meticulous channel depiction

the establishment of high-yield enrichment mode

the formulation with development technology policy

and corresponding engineering fracturing technology. For the narrow channel sand bodies

the multi-domain and multi-attribute fine description and accurate reservoir prediction technology are used

and the spatial distribution characteristics of multi-stage and overlapping channel sand bodies are well described. It can depict the channel sand bodies of the thinnest 8 m and the narrowest 50 m

and the sedimentary time sequence of each channel sand body is also very clear. An improved three-parameter pre-stack inversion technique based on ray parameter domain is used to realize the high-precision quantitative prediction of thin-layer

the predicted error of reservoir thickness and porosity is less than 10 %. By establishing an effective combination model of source rock fault and channel sand

with high ancient and modern structures or high ancient and low modern structures

and good reservoir physical properties

it is expected to obtain high and stable production of gas wells in these areas. By using the techniques of 3D deployment of well groups

well pattern optimization and horizontal well optimization design

the production degree of tight sandstone gas reservoir in narrow channel is greatly enhanced

and the investment cast is saved. By using the integrated horizontal well fracturing technology

the single well test gas production is steadily increased

and the transformation effect is increased to 10.6 times before implementation. High-efficiency development technology of tight sandstone gas reservoir formed by narrow channel enables efficient exploration and development of the Zhongjiang Gas Field

the largest gas field of Sinopec in western Sichuan

with an annual gas production of more than 1 billion cubic meters.