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选择了塔里木盆地11条地震解释剖面,采用二维模拟方法,结合构造演化特征,恢复了震旦纪以来的地热史和生烃 史。部分井点的结果对比显示,模拟结果与实测数据基本一致。研究表明,震旦纪至现今的热演化可分为四个阶段:即震旦 纪一奥陶纪高热流(“热盆”)热演化阶段;志留纪至晚古生代热衰减、“热盆”向“冷盆”过渡的热演化阶段;中生代稳定热演 化(低热流“冷盆”)阶段;新生代岩石圈挠曲热演化阶段。模拟了塔里木盆地内三大套生油岩系的生烃史,并结合构造演化 史分析了油气聚集的有利地区和构造带。
Eleven seismic interpretation sections of the Tarim Basin were selected and the geothermal history and hydrocarbon generation history since Sinian were restored by using two-dimensional simulation method combined with tectonic evolution. Comparison of the results of some well points shows that the simulation results are basically consistent with the measured data. The study shows that the thermal evolution from the Sinian to the present can be divided into four stages: the thermal evolution stage of the Sinian-Ordovician high heat flux (“hot pot”); the thermal attenuation of the Silurian to Late Paleozoic, the “hot pot” The “cold basin” transitional thermal evolution stage; the Mesozoic stable thermal evolution (low heat flow “cold basin”) stage; the Cenozoic lithospheric flexural thermal evolution stage. The hydrocarbon generation history of the three major oil-bearing rock series in the Tarim Basin was simulated. Based on the tectonic evolution history, favorable areas and tectonic belts of hydrocarbon accumulation were analyzed.