试论碳酸盐岩天然气地球化学的研究方向

虽然多年来油气勘探的实践说明碳酸盐岩可以成为烃源岩，但对于碳酸盐岩的成烃机理和评价标准尚无定论。作者认为，这主要是碳酸盐岩的生烃过程与泥岩的重烃过程不同引起的：碳酸盐岩一般先成岩而后生烃，泥岩一般则先生烃而后成岩。作者根据四川盆地碳酸盐岩天然气地球化学的研究现状，提出今后碳酸盐岩油气地球化学研究的主要方向有：1、碳酸盐岩烃源岩生烃机理研究；2、碳酸盐岩天然气有效运聚系统研究；3、碳酸盐岩气藏地球化学研究，并提出了相应的主要研究内容。

ON THE RESEARCH DIRECTION OF NATURAL GAS GEOCH- EMISTRY IN CARBONATE ROCK

Petroleum exploration has proved that carbonate rock is an important source rock but the mechanism of hydrocarbon generation carbonate rock have remained unclear.It is caused by the different way of hydrocarbon generation between carbonate and clay rock.Generally, diagensis is earlier than hydrocarbon generation in carbonate rock and later than hydrocarbon generation in clay rock.Based on the research of natural gas geochemistry in Sichuan basin,it is suggested that the most important research direction of petroleum geochemistry in carbonate rock includes evaluation of carbonate source rock,effective migration and accumulation system of natural gas,and gas reservoir geochemistry in carbonate rock.