There are some salutatory harriers in the horizontal direction of pay zone,which maybe hinder the propagation of hydraulic fracture or change the propagation direction of hydraulic fracture,as a result,the effect of hydraulic fracturing may be discounted.

During a geo-steering drilling to horizontal-well reservoir,pay zone often changes very suddenly resulted in a bit offset.

To the problem of the formation not producing water at pre-fracture and producing water at post-fracture,it is very important that the forecast at pre-fracture time for producing water layer of the well whose oil productivity is smaller than that at pre-fracture because of too much of water production.

In order to appreciate oil layer, production test means for low-productivity zone on different well condition is suggested clearly, several points for oil testing and its evaluation are proposed to supply reference for selecting proper .

Theoretical equation for calculating attitude of stratum in buried hill has been established by using structure geometry, so that the space distribution of buried hill strata can be quantitatively described.

During the research,it is found that there are two types of high-production gas pay in electric property.