Abstract: Lithologic exploration of Biogenic Gas are at the exploratory stage in Sanhu Depression. According to advantageous sedimentary belts of lithologic gas accumulation, this paper firstly analyze the parameters of rock physics, and then forward model the abnormity caused by gas to direct searching seismic abnormity. Secondly, combined with the tectonic background, select possible gas belts using sensitive seismic attributes. At last, fix the advantageous objective using many methods in the abnormal belts, such as spectrum decomposition, time-frequency analysis, prestack inversion, poststack technology to predict Quaternary biogenic gas abnormity inversion and so on. This paper build up a suite of in Sanhu Depresssion.