四川盆地下寒武统烃灶动态演化分析

发布时间：2018-02-28 19:45

本文关键词： 烃灶动态演化成烃成藏下寒武统四川盆地　出处：《石油实验地质》2017年03期 　论文类型：期刊论文

【摘要】：四川盆地下古生界海相烃源岩具有早熟、过熟的特点,烃灶形式转换(即干酪根热解型烃灶演变为古油藏裂解型烃灶(简称油灶))及由此导致的接力供烃是高—过成熟下古生界层系高效成藏的关键。因此,烃灶动态演化分析及准确定位是勘探选区的基础工作。通过对四川盆地构造、沉积演化和热体制的分析,应用TSM盆地模拟系统,在烃源岩埋藏史、热演化史、生烃史分析基础上,刻画了下寒武统牛蹄塘组烃源岩干酪根型烃灶的空间展布,再结合地史时期的古构造、流体势、有效储层的分析,用成藏概率法对"古油灶"进行了定位,实现了对烃灶的动态连续追踪。结果表明,牛蹄塘组烃源岩生、排烃高峰为加里东和海西期,烃灶中心位于川西南资阳—宜宾—赤水、盆地东缘的秀山—利川和川东北盆缘一带;至晚印支期(T3)末,伴随烃源岩普遍达到过成熟,且由于前期大量的生排烃,干酪根烃灶的供烃能力逐渐衰竭,取而代之的是前期形成的古油藏(古油灶)的接力供烃。资阳—重庆—宜宾及盆地南缘、北缘和东北缘是古油灶分布概率最高的地区。
[Abstract]:The Lower Paleozoic marine source rocks in Sichuan Basin are precocious and overmature. The transformation of hydrocarbon stove form (that is, kerogen pyrolysis type hydrocarbon cooker to paleoreservoir pyrolysis type hydrocarbon stove) and the resulting relay hydrocarbon supply are the key to the high and over-mature Lower Paleozoic reservoir formation. Dynamic evolution analysis and accurate location of hydrocarbon stoves are the basic work of exploration district. Through the analysis of the structure, sedimentary evolution and thermal system of Sichuan Basin, the TSM basin simulation system is used to analyze the burial history and thermal evolution history of hydrocarbon source rocks. Based on the analysis of hydrocarbon generation history, the spatial distribution of kerogen hydrocarbon stoves in source rocks of Niutetang formation of Lower Cambrian is described. Combining with the analysis of paleotectonics, fluid potential and effective reservoirs in the geological history period, the "paleooil stoves" are located by using the method of reservoir forming probability. The dynamic continuous tracing of hydrocarbon stoves has been realized. The results show that the peak of hydrocarbon generation and hydrocarbon expulsion in Niulitang formation is Caledonian and Hercynian, and the center of hydrocarbon foci is located in Ziyang, Yibin and Chishui in southwest Sichuan. At the end of the late Indosinian period, Xiushan-Lichuan and northeastern Sichuan basin margin in the eastern margin of the basin, accompanied by overmature hydrocarbon source rocks, and the hydrocarbon supplying capacity of kerogen stoves was gradually depleted due to a large amount of hydrocarbon generation and expulsion in the early stage. Instead of the relays of the paleooil reservoirs formed in the early stage, Ziyang-Chongqing-Yibin and the southern margin of the basin, the northern margin and the northeast margin are the areas with the highest distribution probability of paleooil stoves.
【作者单位】：中国石化石油勘探开发研究院无锡石油地质研究所;
【基金】：中国石化科技部项目(P11087)资助
【分类号】：P618.13

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