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我国一些含油气盆地的油气形成和演化常与岩浆活动有一定的关系。岩浆余热对沉积岩及其有机质的热演化影响较为复杂。岩浆活动的规模、时间、方式以及岩浆岩体的形态、物质成分乃至围岩(沉积岩)的热学性质、构造形态等等因素,对油气形成和演化都具有一定影响。 本文不拟全面讨论各种方式的影响,而只就岩浆冷却过程中所释放的热量对围岩温度和围岩中有机质的影响这一问题作一些探讨。
The formation and evolution of oil and gas in some petroliferous basins of our country are often related to the magmatism. The magmatic residual heat has a more complicated influence on the thermal evolution of sedimentary rocks and their organic matter. The size, time and mode of magmatism, as well as the shape and composition of magmatic rocks and the thermal properties and tectonic features of the surrounding rocks (sedimentary rocks) have an impact on the formation and evolution of oil and gas. This article does not intend to fully discuss the impact of various modes, but only discusses the issue of the heat released during magma cooling affecting the surrounding rock temperature and the organic matter in the surrounding rock.