莺琼盆地高温超压环境有机质热演化及成烃模式探讨

方法 针对莺琼盆地的成藏地质条件，对其温压环境及地化指标进行了综合分析。目的 研究莺琼盆地的有机质热演化及成烃模式。结果 莺琼盆地的演化机制在盆地内大的热传导背景下主要受地温梯度和演化时间控制；在盆地内热流体活动强烈的地区，源岩的演化得到明显的加强，同时，盆地普遍超压的特点减缓了超压层内有机质的成熟速率，使本来在无超压抑制作用已进入疹变质阶段的源岩保持在有利的生气带内，从而拓宽了生烃窗的范围，扩大

Thermal evolution and hydrocarbon-generating model of organic matter in high temperature and overpressure setting of Yingqiong basin.

Method\ The temperature and pressure settings and geochemical indicators under the reservoir forming geologic conditions in Yingqiong basin are comprehensively studied. Purpose\ To study the thermal evolution and hydrocarbon-generating model of organic matters. Result\ The evolution mechanism in the basin with large-scale thermal conduction background is mainly controlled by geothermal gradient and evolution time. The source rock evolution is obviously enhanced in the area of the basin where intense activity of thermal fluid exists while overpressures through the whole basin slow the maturation rate of organic matter in the overpressure zones. As a result, the source rock, which are not subjected to overpressure inhibition and has developed into penemetamorphic stage, remains within the favorable gas-generating zones so that the range of hydrocarbon potential and petroleum exploration realms are expanded. Conclusion\ Basin exploration direction can be determined to a certain degree and petroleum plays can thus be discovered only on the basis of full understanding of the source rock evolution characteristics and hydrocarbon-generating model in Yingqiong basin.