准噶尔盆地玛湖凹陷深层构造—热演化研究

项目名称： 准噶尔盆地玛湖凹陷深层构造—热演化研究

项目编号： No.41502236

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 饶松

作者单位： 长江大学

项目金额： 20万元

中文摘要： 构造—热演化是盆地动力学和石油地质学领域研究的重要内容。随着我国油气短缺逐年加大，以玛湖凹陷为代表的西部叠合盆地深层成为了我国最现实的油气后备储量接替区。然而，玛湖凹陷自石炭纪以来经历了多期复杂构造—热历史，早期热记录被后期热事件叠加改造，深层热史研究中缺乏系统的有效古温标、热史恢复方法单一，难于有效恢复研究区深层热历史，导致对深层烃源岩生烃期次认识不一，进而影响对深层油气成藏规律的正确认识，这已经制约着研究区深层油气勘探。因此，该项目拟系统测试不同类型、不同封闭温度的古温标，建立有效古温标剖面；通过低温热年代学和传统古温标的耦合反演，并对石炭纪岩浆作用、早—中二叠世岩石圈拉张减薄/挤压增厚等重要热事件辅以构造—热演化数值模拟，正反演相结合系统厘定研究区晚古生代以来的多期复杂热史。研究成果可以为正确认识玛湖凹陷晚古生代以来构造—热演化关系以及深层油气成藏演化规律提供重要科学依据。

中文关键词： 构造-热演化；深层；低温热年代学；热模拟；玛湖凹陷

英文摘要： Tectono-thermal evolution is an important aspect of the basin dynamics and petroleum geology. With the increasing petroleum shortage year by year, the deep zones of superimposed basins in western China are the most realistic zones to succeed the strategic reserves area of oil and gas. However, as an example, the deep zone in Mahu sag has experienced multi-phase complex tectono-thermal evolution history since the Carboniferous period, then the early thermal recording has superimposed and reformed by the late hot events. There are many issues on the tectono-thermal history reconstruction in the deep zone of Mahu sag, such as lack of sufficient and effective thermal indicator data, too simple method of thermal history reconstruction, which make it difficult to recover the thermal history of the study area. It leads to different understanding on periods of hydrocarbon generation, thereby affecting the correct understanding of the law of deep oil and gas accumulation, which has restricted the deep petroleum exploration. Therefore, the project intends to establish effective paleothermometers profile on the base of systemic testing of different types and different closure temperatures thermal indicator; then reconstruct the multi-phase thermal history since the Late Paleozoic of the Mahu sag by joint inversion of low-temperature thermochronology and traditional geothermometer, and tectono-thermal evolution numerical simulation of the Carboniferous large-scale magmatism and the lithospheric thinning/thickening during Early-Middle Permian. The results can provide important scientific basis for a correct understanding of tectono-thermal evolution relationship since the Late Paleozoic, and hydrocarbon accumulation in deep zone of Mahu sag.

英文关键词： Tectono-thermal evolution;Deep zone;Low-temperature thermochronology;Thermal simulation;Mahu Sag