Thermal effect of intrusive rock on hydrocarbon generation from organic matter
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- 作者：Min Wang ; Shuangfang Lu ; Shumin Chen ; Jianzhong Li…
- 关键词：Thermal effect ; Intrusive rock ; Hydrocarbon generation ; Thermal conduction model ; Kinetic model ; Yingtai Fault Depression ; Songliao Basin
- 刊名：Arabian Journal of Geosciences
- 出版年：2015
- 出版时间：January 2015
- 年：2015
- 卷：8
- 期：1
- 页码：39-56
- 全文大小：1,939 KB
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文摘
Igneous intrusions may contain sufficient heat that can have an effect on the generation of hydrocarbons from the source rock. This model is tested in the Yingtai Fault Depression of the southern Songliao Basin, where intrusive rocks are abundant. A heat conduction model and kinetic models of hydrocarbon generation are calibrated by using the hydrocarbon yield data from pyrolysis experiment and vitrinite reflectance values of source rocks adjacent to intrusive rocks. Our analysis shows that the intrusive rock contributes to the hydrocarbon generated from organic matter in the neighboring rock nearby the intrusive rock. For instance, as the distance to the contact surface is decreased, the maturity of the organic matter of neighboring rock increases gradually, H/C and TOC decreases gradually. The results have revealed that the extents affected by intrusive rocks with different thicknesses at various initial temperatures are basically not more than twice of the thickness of the intrusive rock. For multiple intrusive rocks, the extent and the degree of the thermal effect during a contemporaneous emplacement and emplacement at different stages are obviously different. The extent and degree of the thermal effect during contemporaneous emplacement are normally large. The degrees of thermal effect are different for neighboring rocks with different initial maturity, which is affected by the intrusive rock with the same parameters (such as thickness or initial temperature). Setting 0.9?% as the maturity (Ro) limit, at maturity less than 0.9?%, the Ro thermal effect (increment amount of Ro) increases as the initial maturity of the neighboring rock rises. At maturity of more than 0.9?%, it decreases as the initial maturity of neighboring rock rises. The results of the geological application have shown that the hydrocarbon generation history of source rock in an area with intrusive rocks can be solved effectively by an integrated use of the heat conduction model and the kinetic model of hydrocarbon generation.