Abstract:

The development of geostress profile has opened a new field for log data application.According to the analysis of the geostress field of 4 wells in XL Gasfield in West Sichuan,the rock dynamic parameters,the 3-D principal stress,the direction of horizontal stress field,the common engineering pressure and sand producing index of the reservoir in Shaximaio Formation of XL Gasfield in West Sichuan have following characters:1.the development degree of porosity and fractures can effect reservoir dynamic property;2.3-D principal stress could usually satisfy the following relational expression:σ_H>σ_V>σ_h,the horizontal stress and breakdown pressure of fracture developed horizon are usually lower than that of country rock,but the slump pressure is higher than that of the country rock;3.horizontal principal stress basically coincides with horizontal principal stress of regional tectonics in West Sichuan excepting particular horizons;4.sand producing index is high and there is no sand produced.

Key words: geostress, log, rock dynamic parameter, engineering pressure,reservoir exploitation