Taking the low permeability reservoirs in the Jishan sandbody of Huimin Sag,Jiyang Depression as examples,together with limited data of well tests,the geochemical evaluation method for the reservoirs has been proposed as follows:Firstly,Rock-Eval provides hydrocarbon-content information to determine sketchily oil layers,water layers and oil-water layers,and the marginal values of ST are 4.

P layer in G oilfield is a structural-lithologic reservoir controlled chiefly by lithology with many oil-water layers.

This paper analyzes the current development status and production performance in Hongnan reservoir,proposed comprehensive treatment plan and commingled production of oil and water.

The paper briefly introduces the classification,features and the relative design and construction problems of the drainage on the same floor;and mainly advocates the wall concealed drainage mode,and puts forward ideas and suggestions to solve the problems in the practical project.