Abstract: Sulige gas field, a very rare low permeability, low pressure, and low abundance gas field, is composed of highly heterogeneous tight gas reservoirs. It is an exploration and development model of low permeability reservoirs in China. Because of the small acoustic impedance difference between mudstones and gas-bearing sandstones, and the influence of seismic resolution, the distribution of effective reservoirs in Sulige area cannot be clearly characterized using conventional post-stack inversion method. Targeting at the problems encountered in the exploration and development of low permeability sandstone reservoirs in Sulige gas field, a technical process and procedure relating to rock physics, multi-component seismic data processing, inversion, interpretation, and geological analysis is set up systematically, which contains well-controlled seismic data processing, fine event match of PP and PS, simultaneous inversion of PP and PS, and some other corresponding techniques. Different from single P-wave, multi-component exploration uses the introduction of converted wave seismic data as a constraint condition, to improve the stability of inversion, and signal to noise ratio of its results, thus improving accuracy of reservoir prediction. Its application in Sulige area has proved the effectiveness and feasibility of the techniques, and accumulated valuable experiences for exploration and development of similar oil/gas fields in future.

Key words: Sulige gas field, low permeability, multi-component exploration, reservoir prediction, rock physics, prestack simultaneous inversion