盆地岩浆侵入的热演化及其对生油窗的影响

在考虑岩浆侵入体的基本物理特征以及冷却过程中结晶潜能释放的条件下，建立了温度场的函数表达式，实现了对岩浆侵入热活动的数值模拟，阐述了岩浆在冷却过程中的温度分布和变化规律及影响因素，并利用时间-温度指数分析岩浆侵入对生油窗的影响。分析认为，岩浆侵入体热演化分为两个阶段，第一阶段侵入体较快速冷却，同时围岩温度缓慢上升，随后侵入体温度缓慢下降与围岩温度相近；岩浆的侵入加快有机质的成熟并使生油窗的深度变浅。

Thermal Evolution of Magma Intrusion and Its Effect on Oil-Generating Window in Sedimentary Basin

Magma intrusion in a sedimentary basin can lead to the change of the geothermal history of the basin, accelerate the maturation of the organic matters and influence the generation and preservation of oil and gas. Considering the fundamental physical properties of magma intrusion and the latent heat effect in magmatic cooling, the functional relation about the change in temperature site is established, the thermal evolution modeling of magma intrusion with VB program is finished, expounding the distribution, changed rule and influential factors of the temperature within the magmatic cooling as well as effect of magma intrusion on oil-generating window using timetemperature index (ITT). The modeling results indicate that: The magmatic cooling history can be divided into fast cooling stage and slow cooling stage. In the first stage, the magma intrusive body cools rapidly while the enclosing bed is heated simultaneously, followed by the temperature of magma intrusive body being closed to that of enclosing bed. In the second stage, the temperature of the magma intrusive body is close to that of enclosing bed, and it cools slowly. Magma intrusion can accelerate hydrocarbon maturation and shoal the depth of oil-generating window.