Abstract: With rapid development of unconventional hydrocarbon exploration industry, fruitful results have been achieved in China's tight oil and gas exploration. Based on multi-year unconventional hydrocarbon exploration as well as characteristics of tight oil reservoirs in continental rift basins, tight oil reservoirs in China's continental basins can be preliminarily classified into tight sandstone reservoirs and special-lithology tight reservoirs; the latter include calcilutite tight reservoirs, rudstone tight reservoirs, tuff tight reservoirs and etc. As compared with conventional tight sandstone reservoirs, special-lithology tight reservoirs have special genesis and diversified reserving space types, which are difficult to predict using conventional geophysical methods. Through detailed research on calcilutite-calcirudite tight reservoirs in the lower part of Member 3 of Shahejie Formation, Shulu sag, hydrocarbon accumulation mode of special-lithology tight reservoirs was established. Multi-factor comprehensive analysis is required for exploration of special-lithology tight reservoirs. Meanwhile, it needs to summarize control factors for tight reservoir accumulation and establish applicable hydrocarbon accumulation modes for exploration areas, thus guiding the follow-up exploration and development.