页岩油吸附烃与游离烃资源评价方法的研究

China has abundant oil shale resource potential. As one of the main types of unconventional oil and gas, the evaluation of adsorbed hydrocarbons and free hydrocarbons in shale is a hotspot at Home and Abroad, also is the difficulty to evaluate unconventional oil and gas resources. At present, there is no generally applicable method to evaluate shale oil resources. In this study, the Permian shale, Junggar Basin, China as the reasearch object, taking “polymer solution theory” as the guidance, swelling experiment as a means, the simulation experiment of hydrocarbons generation-retention and adsorption experiment of mineral particles were studied. Combining the specific thermal evolution history to reproduce the ability of hydrocarbons generation-retention and evolution process of shale in the geological history, establishing the kinetics model of hydrocarbons generation–retention-expulsionit, obtaining the content of adsorbed hydrocarbons and free hydrocarbons in shale. It is established a reliable and generally applicable method and experimental techniques to evaluate shale oil resources, which is provided theoretical basis for evaluation and practical exploration of unconventional oil and gas resources.

我国具有丰富的页岩油资源潜力，作为非常规油气能源的主要类型之一，泥页岩中吸附烃和游离烃的定量评价是国内外研究的热点之一，也是非常规油气资源评价的难点。目前，并没有普遍适用于页岩油资源评价的方法。本项目拟以准噶尔盆地二叠系地层的泥页岩为研究对象，生烃动力学为基础，“聚合物溶解理论”为指导、溶胀实验为手段，开展泥页岩中有机质（干酪根）的生-留烃模拟实验和泥页岩中无机质（矿物颗粒）对页岩油的吸附实验；结合具体的热演化史再现地质历史时期泥页岩的生-留烃能力与演化过程，建立泥页岩的生-留-排烃动力学模型，获取页岩油吸附态、游离态的量。旨在建立一套可靠的普遍适用于页岩油资源评价的方法和实验技术，为非常规油气的资源评价和实际勘探提供理论依据。

本项目以准噶尔盆地二叠系地层的泥页岩为研究对象，以生烃动力学为基础，“聚合物溶解理论”为指导、溶胀实验为手段，开展了热解残余干酪根留烃动力学和组分分异的研究，结合总烃及族组分生烃动力学过程，建立了泥页岩的生-留-排烃动力学模型，预测了准噶尔盆地东南缘二叠系芦草沟组泥页岩中游离烃和吸附烃的量。实验及模拟数据表明现阶段准噶尔盆地东南缘二叠系芦草沟组泥页岩中游离烃为289.18 mg/g TOC，其中游离的饱和烃、芳烃和NSOs分别为167.50 mg/g TOC、45.14 mg/g TOC和76.54 mg/g TOC，吸附烃量为35.42 mg/g TOC，其中吸附的饱和烃、芳烃和NSOs分别为10.12 mg/g TOC、11.90 mg/g TOC和13.40 mg/g TOC。此研究模型不仅可以预测生-留-排烃时间以及游离烃和吸附烃的量，而且可以预测油气组分的分异，可为泥页岩的生-留-排烃的研究提供新的方法和实验技术。