准噶尔盆地南缘柴窝堡凹陷泥页岩地球化学和矿物学特征研究

发布时间：2018-05-04 06:55

本文选题：柴窝堡凹陷 + 泥页岩　；参考：《地质力学学报》2017年04期

【摘要】：利用XRD、Rock-eval和气相色谱—质谱仪对准格尔南缘柴窝堡凹陷上石炭统、上二叠统及下侏罗统的泥页岩进行了地球化学和矿物学特征分析。有机地球化学实验结果指示,柴窝堡凹陷石炭纪至二叠纪经历了较长时期的淡水—微咸水沉积环境,有机质来源具有相似的母源输入特征,干酪根类型具有II型混合母质特征;有机质热演化特征表明,下侏罗统泥页岩处于低熟阶段,上石炭统与上二叠统泥页岩具有机质丰度较高、有机质类型丰富、热演化处于成熟—高成熟阶段等特点;矿物学特征显示,上二叠统泥页岩长石、石英等脆性矿物含量为73%,粘土矿物次之,指示其脆性指数较高,具有较好的可压裂性和粘土表面吸附性。结合前人认识,预测该段泥页岩中可能蕴藏着一定规模的页岩气资源,具有较好的页岩气资源前景和勘探潜力。
[Abstract]:The geochemical and mineralogical characteristics of the upper Carboniferous Upper Permian and Lower Jurassic mud shale in Chaiwopu sag of the southern margin of Zhungeer are analyzed by using XRDX Rock-eval and gas chromatography-mass spectrometer. The experimental results of organic geochemistry indicate that the Carboniferous to Permian period in Chaiwupu sag has experienced a long period of fresh water and brackish water sedimentary environment, the organic matter source has similar characteristics of mother source input, and the kerogen type has the characteristics of type II mixed parent material. The characteristics of organic matter thermal evolution indicate that the lower Jurassic shale is in low maturity stage, and the upper Carboniferous and Upper Permian shales are characterized by high organic matter abundance, rich organic matter types and thermal evolution at the mature to high maturity stage. The mineralogical characteristics show that the upper Permian shale feldspar and quartz contain 73 brittle minerals, followed by clay minerals, indicating that its brittleness index is higher, and it has good fracturing ability and clay surface adsorbability. Combined with the previous understanding, it is predicted that there may be shale gas resources on a certain scale in the shale shale, which has a good prospect of shale gas resources and exploration potential.
【作者单位】：中国地质科学院地质力学研究所;北京大学地球与空间科学学院;中国科学院油气资源研究重点实验室/甘肃省油气资源研究重点实验室;
【基金】：国家自然科学基金项目(41072106) 中国科学院西部行动计划项目(KZCX2-XB3-12)
【分类号】：P618.13

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