The cracking gas from crude oil and its significance in gas exploration.
The cracking gas from crude oil and its significance in gas exploration.
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DOI：
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发表时间：
2001
影响因子：
7.5
通讯作者：
Zhaoping Meng
中科院分区：
文献类型：
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作者：
Zhaoping Meng
本文通过对生烃理论和古油藏演化过程的探讨，提出了石油裂解气这一课题。这里，石油裂解气的含义只是与油藏的演化有关，当埋藏较深时，原油会裂解成天然气和沥青。石油裂解气是在特殊的地质条件下产生的；例如，塔里木盆地和田河气田的天然气就是深层储层原油因晚期构造运动而裂解的产物。塔北隆起东部桑塔木气田和和田河气田的天然气均来源于寒武系烃源岩，但两种天然气的生成过程不同。塔北隆起东部天然气主要由干酪根裂解形成，和田河气田天然气主要由石油裂解形成。因此，两种气体除了成熟度相似外，在成分和同位素方面存在明显差异。例如，和田河气田天然气的非烃类气体含量高于塔北隆起东部，甲烷同位素比值较轻。
In this paper, the topic about the cracking gas from oil is put forward through the discussion on the theory of hydrocarbon generation and the evolution process of Palaeo oil reservoirs. Here, the meaning of the cracking gas from oil is just related to the evolution of an oil reservoir, when it is buried deeply the crude oil will be cracked to gas and bitumen. The cracking gas from oil just takes place under special geological conditions; for example, the gas of Hetianhe field in Tarim basin is the cracking product of the crude oil in deep buried reservoir because of late tectonic movement. Both the gases from Sangtamu field in eastern Tabei Uplift and from Hetianhe field are derived from Cambrian source rocks, but the generation process for the two gases is different. The gases from eastern Tabei Uplift are mainly formed by kerogen cracking and the gases from Hetianhe field mainly formed by oil cracking. So there are obviously differences for the two gases in the components and their isotopes except the similar maturity. For example, the non hydrocarbon gas content is higher and the methane isotopic ratio is lighter for the gases from Hetianhe field than that from eastern Tabei Uplift.