塔里木盆地海相腐泥型天然气的成因判识

GENETIC DISCRIMINATION OF MARINE SAPROPELIC TYPE GAS IN TARIM BASIN

陈世加 马力宇 付晓文 林峰 罗玉宏

Chen Shijia Ma Liyu Fu Xiaowen Lin Feng Luo Yuhong

腐泥型天然气既可来自腐泥型于酪根的裂解,也可以来自腐泥型原油的裂解.于酪根直接裂解形成的天然气的C/C比值基本不变,原油裂解的天然气逐渐增大,乙烷和丙烷的碳同位素差（δC-δC）表现出与上述比值相反的变化规律.据此判断,塔北地区吉拉克、桑塔木、解放渠的天然气来自腐泥型于酪根的裂解,而轮南地区、英买力地区的天然气来自原油的裂解.

Sapropelic gas could be derived from the cracking of both sapropelic kerogen and sapropelic crude oil. The differences between these two different kinds of genetic gases are: 1 the value of C/C of the gas derived fron kerogen remains constant while that of the gas derived from crude oil increases gradually; the difference of carbon isotope of (δC-δ C) is opposite to the above memtioned values. It is considered that the gas in Jilak, Sangtamu and Jiefangqu regions in North Tarim Basin is derived from sapropelic kerogen while the gas in Lunnan, Yinmali regions is derived from crude oil.

10.11743/ogg20010202