RESEARCH ON BIOGENIC GAS GENERATION SIMULATION EXPERIMENTS ON DIFFERENT TYPES OF ORGANIC MATTER

In order to study the biogenic methane generating abilities and characteristics of different type of organic matter,six samples of four types of organic matter are selected to take biogenic gas generation simulation experiments.The analyzing result of gas products shows that the differences of biogenic methane product potential among different organic matters are great.Gas generating potential difference between algae and peat is a hundred times.The distribution of high qualifies organic matter such as algae in the biogenic gas source rock and its contribution in gas reservoir formation should be paid more attentions.The biogenic transformation rates of different organic matters are distinguished greatly,so it is worth paying some attentions when evaluating biogenic gas source rock.In addition,the carbon isotope ratio of biogenic methane is doubly controlled by the isotopic fraction effect and the carbon isotope ratio of mother material,and the distribution range is large.The isotope value of biogenic carbon dioxide is obviously heavy.It is suggested many parameters such as methane carbon isotope,carbon isotope of carbon dioxide and gas composition should be comprehend together when identifying the origin of gas reservoir.