Re-evaluation of hydrocarbon generation potential of the Upper Paleozoic coal-measure source rocks in the Hangjinqi area of Ordos Basin
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摘要: 鄂尔多斯盆地北缘杭锦旗地区上古生界是中国石化华北油气分公司天然气的重要增储上产领域。及时开展该地区上古生界煤系烃源岩的生烃潜力再评价研究，有利于为下步勘探部署提供参考。综合利用有机地球化学、有机岩石学等技术手段，结合地层孔隙热压生排烃物理模拟、TSM盆地资源评价数值模拟等新方法和勘探新资料，系统分析、对比研究区上古生界烃源岩的沉积环境、品质特征和展布特征，进而深入开展生烃潜力的再评价。杭锦旗断裂带以南地区上古生界烃源岩具有"品质好、演化程度高、厚度大"的总体特征，而断裂带以北地区则相反。基于物理模拟和数值模拟结果计算，杭锦旗地区上古生界煤系烃源岩的总生气量为15.922×1012 m3，断裂带以北地区生气强度一般小于10×108 m3/km2，而断裂以南地区生气强度主要分布于（15~35）×108 m3/km2，具备形成大中型气田的物质基础。Abstract: The Upper Paleozoic strata in the Hangjinqi area of the Ordos Basin are an important field to increase reserves and productions for the North China Oil and Gas Branch, SINOPEC. It is necessary to conduct a re-evaluation of hydrocarbon generation potential for the Upper Paleozoic coal-measure source rocks in time, which is favorable to provide theoretical support for further exploration and deployment. The organic geochemical and organic petrological approaches were carried out in this study and integrated with the physical simulation of hydrocarbon generation and expulsion from formation pore by thermal compression, numerical simulation of TSM basin resource evaluation and new exploration data, in order to systematically analyze and compare the sedimentary environment, quality and distribution of the Upper Paleozoic source rocks, and further to conduct the re-evaluation of hydrocarbon potential. The results indicated that the Upper Paleozoic source rocks of the south of the fault belts in the Hangjinqi area appeared to have characteristics of good quality, high evolution degree, and a great thickness, whereas those in the north part of the fault belts displayed the negative characteristics. As indicated by the physical and numerical simulation results, the Upper Paleozoic coal-measure source rocks in the Hangjinqi area displayed a total gas generation amount of 15.922×1012 m3. The gas generation intensity to the north of the fault belts was less than 1×109 m3/km2, whereas that to the south ranged (1.5-3.5)×109 m3/km2, which has provided a material basis for the generation of large and medium gas fields.
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图 1 鄂尔多斯盆地杭锦旗地区构造区带及岩心采样井位分布
Figure 1. Distribution of tectonic zones and wells for core sampling in Hangjinqi area, Ordos Basin
图 2 鄂尔多斯盆地杭锦旗地区J7井上古生界太原组、山西组相关微量元素及其比值
Figure 2. Contents and ratios of trace elements in source rocks from Upper Paleozoic Taiyuan and Shanxi formations in well J7, Hangjinqi area, Ordos Basin
图 3 鄂尔多斯盆地杭锦旗地区上古生界太原组、山西组暗色泥岩(a)、煤(b)有机质丰度分布
评价标准据参考文献[13]。
Figure 3. Distribution of organic matter abundance for dark mudstones (a) and coals (b) in Upper Paleozoic Taiyuan and Shanxi formations, Hangjinqi area, Ordos Basin
图 4 鄂尔多斯盆地杭锦旗地区上古生界太原组、山西组烃源岩干酪根碳同位素值分布
Figure 4. Distribution of carbon isotopic values of kerogen in source rocks from Upper Paleozoic Taiyuan and Shanxi formations, Hangjinqi area, Ordos Basin
图 5 鄂尔多斯盆地杭锦旗地区上古生界烃源岩Ro等值线
Figure 5. Ro contours of Upper Paleozoic source rocks in Hangjinqi area, Ordos Basin
图 6 鄂尔多斯盆地杭锦旗地区上古生界太原组、山西组煤层南北向连井剖面
剖面位置见图 1。
Figure 6. SN-trending well-connecting profiles of coal seams in Upper Paleozoic Taiyuan and Shanxi formations, Hangjinqi area, Ordos Basin
图 7 鄂尔多斯盆地杭锦旗地区上古生界暗色泥岩、煤层厚度等值线
Figure 7. Thickness contours of Upper Paleozoic dark mudstones and coal rocks in Hangjinqi area, Ordos Basin
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