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经一定程度热演化的烃源岩当构造运动使其再次进入微生物作用带时，微生物能继续利用其有机质产生生物气，称之为后生式生物气。文章通过实验和地质论证证明其存在，并探讨了其地质意义。这一发现扩大了天然气勘探领域。认为在浅层煤层中可开发这种生物型煤层气，甚至可以利用微生物提高浅层煤层气的产量；我国南方碳酸盐岩裸露区和浅深区也可能发现这种生物气。

Study on Biogas in Bohaiwan Basin and Its Surroundings

While generating rocks, afterthrough thermal evolution to a certain degree, were put into the microbial action zone by tectogenesis, its organics we re made by the microbes into biogas, which is also called epigenetic biogas. The existance of epigenetic biogas was proved both by the experiments and geologica l analysis. Its geological significance is discussed here as well. Thus, gas exp loration area will be expanded to a large extent for the significant discovery. It is thought that this bio methane can also be developed in the shallow coal b ed and even microbes can be used to enhance the production capacity of shallow m ethane. This biogas will be possibly found in such areas like the naked zones or the shallow zones of carbonate rocks in South China.