Abstract: This paper makes analysis and comparison of the recovery effcts between horizontal wells and vertical wells in volcanic reservoir using modern reservoir engineering and numerical simulation techniques, based on geological characteristics of Carboniferous volcanic reservoir in Shixi oilfield, Junggar basin. And the feasibility by using horizontal well for development of such an oilfield has been demonstrated. In addition, the study presents geologic design, productivity analysis and reasonable productivity by horizontal well process. The comparison of field performance data showed that horizontal well is well suitable for development of natural fractured volcanic reservoirs with deep, low permeability, block and bottom water as well as abnormal high pressure and determination of horizontal well productivity is accepted to be reliable and feasible in methodology.

Key words: Junggar basin, volcanie rock, horizontal well, numerical simulation, productivity prediction, development effect