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为了明确临清坳陷东部上古生界煤系烃源岩的生烃演化过程,对煤系烃源岩的热演化特征、生烃演化与构造-埋藏的时空匹配关系进行了动态分析。研究结果表明,临清坳陷东部上古生界煤系源岩具有多期次的生、排烃过程:初次生烃过程具有区域一致性,主要发生在印支期中三叠世末期,但生烃量有限;主要生烃过程发生在燕山期和喜马拉雅期,现今进入生烃门限的深度在4 000 m左右。临清坳陷东部可以划分出中隆新隆、中坳新隆、中坳新坳等3种不同类型的盆地叠合单元,对于上古生界煤成气藏勘探而言,应在盆地叠合单元详细区划的基础上,重点在中坳新坳型叠合单元寻找那些主力二次生烃期较晚(古近纪末或新近纪—第四纪),且后期构造变动相对较弱的地区。
In order to clarify the hydrocarbon generation and evolution of the Upper Paleozoic coal measures in eastern Linqing Depression, the dynamic evolution of the thermal evolution characteristics, hydrocarbon generation evolution and tectonic-burial relationship of the coal-based source rocks was analyzed. The results show that the Upper Paleozoic coal-bearing source rocks in the eastern part of Linqing Depression have multiple stages of hydrocarbon generation and expulsion processes. The primary hydrocarbon generation processes are regionally consistent and occur mainly in the middle Triassic during the Indosinian Period. However, hydrocarbon generation The main hydrocarbon generation processes occur in the Yanshanian and Himalayan periods, and the current depth of hydrocarbon generation threshold is about 4 000 m. In the eastern part of Linqing Depression, three different types of basin superimposed units such as Zhonglong Xinlong, Zhongao Xinlong and Zhongao Xin Au can be distinguished. For exploration of Upper Paleozoic coal gas reservoirs, they should be superimposed in the basin On the basis of the detailed zoning of units, the focus is on finding the areas where the main secondary hydrocarbon generation period is late (Paleozoic or Neogene-Quaternary) and the later tectonic changes are relatively weak .