岩浆侵入体热作用对烃源岩生烃影响的定量表征
——以松辽盆地南部英台断陷为例

Thermal influence of magma intrusion on hydrocarbon generation of source rock:Taking south Yingtai Fault Depression of Songliao Basin as an example

王民 王岩 卢双舫 于占清 刘大为 陈国辉

中国石油大学（华东）非常规油气与新能源研究院，山东 青岛 266580 东北石油大学地球科学学院，黑龙江 大庆 163318

文中利用钻井、测井、地震等资料识别出英台断陷深层存在岩浆侵入体，结合热量守恒原理和化学动力学模型定量评价岩浆侵入体对烃源岩生烃的促进作用。实验及模型模拟结果显示，随着观察点与岩浆￣围岩接触面距离的减小，围岩中有机质的成熟度逐渐升高，Ro由原来的1.6%升高到2.1%，TOC，H/C，O/C值逐渐降低，氯仿沥青“A”则先增后降。在2套侵入体之间，围岩中TOC则先增大后降低。在侵入体热影响范围内，有机质生气转化率迅速增长，在较短的时间内，增至80%以上。本次研究表明，将化学动力学模型、埋藏史模型和热传导模型结合起来，可以很好地研究存在岩浆活动盆地内烃源岩生油气过程。

Based on the systematic research of drilling, logging and seismic data, magmatic intrusions were identified and the thermal effect of hydrocarbon generation was appraised quantitatively combined with the conservation of energy and the chemical kinetic theory. Experiment and model simulation results indicate that the maturity of organic matter in surrounding rock gradually increases with the decreasing distance from contact surface. Ro increases from 1.6% to 2.1%, the H/C, O/C and TOC values decrease gradually. Chloroform bitumen "A" increases firstly, then decreases. Between two intrusions, the TOC values also increases firstly, then decreases. The gas generation TR increases quickly in the metamorphism range, for example, it can be increase from 0 to 80% during a short period. Study shows that the combination of kinetic model, burial model, thermal conduction model and normal thermal model can be a useful tool to study the hydrocarbon generation process of source rock in magmatic activity basin.

10.6056/dkyqt201402008