Abstract:

Aiming at the difficulty of forecasting volcanic reservoirs, this paper depicts volcanic body on base of the rock-physical analysis and whole 3D high-resolution seismic data, making use of several technics, such as spectrum imaging basing on the wavelet changes, inversion simulation of anneal, well-constrained inversion, etc. The forecast of volcanic lithofacies, thickness of reservoir and reservoir parameters was realized. It suggests that there are 8 craters within the first member of Yingcheng Formation in  the Xincheng area, which control the distribution of volcanic rocks in this area. Developing conditions of volcanic reservoirs are mainly effected by the lithofacies, buried depth and  fracture. Erupted lithofacies are predominated, with more volcanic reservoirs in the shallow area or near the fracture area   with   thicker and better physical properties. Several deepwells, such as Xushen2，are drilled by those technics mentioned above, of which drilling results are consistent with the forecast very well. Drilling veracity is improved and multi-interpretation of reservoir forecast using seismic data is reduced. It is significant for guiding exploring-well deployment.

Key words: the northern Songliao basin, the Xingcheng area, volcanic, prediction of reservoir