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冀中坳陷北部上古生界煤系烃源岩生烃特征及发育的主控因素
李熹微, 刘海涛, 宁才倍, 王元杰, 李奔, 陈红锦, 窦连彬, 韩红涛, 甘华军, 蒋恕, 王波, 伏莉莎, 田宁
PDF(6782 KB)
PDF(6782 KB)
冀中坳陷北部上古生界煤系烃源岩生烃特征及发育的主控因素
The Hydrocarbon Generation Characteristics of the Upper Paleozoic Coaly Bearing Source Rocks and Its Main Controlling Factors in the North of the Jizhong Depression
冀中坳陷位于渤海湾盆地西部，其古生界石炭‒二叠系煤系烃源岩具有很大的资源潜力，已在苏桥‒文安地区发现了与石炭‒二叠系煤系烃源岩有关的油气藏.但是目前对冀中坳陷古生界不同层段煤系烃源岩的生烃特征及其发育的主控因素认识不清，影响了下一步油气勘探决策.在前人研究基础上，对冀中坳陷东北部石炭‒二叠系煤系烃源岩有机地化特征进行分析，并挑选太原组和山西组煤样进行高温高压生烃动力学热模拟实验研究，探讨煤系源岩的生烃潜力和生烃机理，总结其发育的主控因素.研究结果表明，研究区内煤系烃源岩有机丰度高，具有较好的生烃潜力；太原组煤系烃源岩的有机质类型以Ⅱ2型和Ⅱ1型为主，山西组煤系烃源岩以Ⅱ2型和Ⅲ型为主，多处于成熟阶段；太原组煤的生油气能力强于山西组，但山西组煤生气的活化能更低，更容易生成气；煤系烃源岩发育受沉积环境、古气候与古植物因素的控制，太原组煤主要形成于瀉湖泥炭沼泽成煤环境，山西组煤主要形成于三角洲平原泥炭沼成煤环境.综合以上研究建立了研究区的聚煤模式.该成果对该区的油气资源潜力评价具有重要的参考作用.
Jizhong depression is located in the west of Bohai Bay basin. Its Carboniferous-Permian coaly source rocks have great resource potential, of which related oil and gas reservoirs have been explored in Suqiao-Wen'an area in the depression. However, the hydrocarbon generation characteristics and petroleum resource potential of the coaly source rocks still remain unclear in the Jizhong depression, which seriously affects the oil and gas exploration. On the basis of previous research, in this paper it makes a detailed analysis of organic geochemical characteristics of the Carboniferous-Permian coaly source rocks. The hydrocarbon generation potential and mechanism of selected coaly source rocks from Taiyuan Formation and Shanxi Formation are also explored by the experiment of high temperature and high pressure hydrocarbon generation kinetics. The research shows that the organic abundance of coal source rocks in the study area is high, indicating good hydrocarbon generation potential. The organic matter types of Taiyuan Formation are mainly type II2 and type II1, and the organic matter types of Shanxi Formation are mainly type II2 and type III, which are mostly in the mature stage.The oil and gas generation capacity of Taiyuan Formation is stronger than that of Shanxi Formation, but the activation energy of coal in Shanxi Formation is lower and it is easier to generate gas. The development of coal-bearing source rocks is controlled by sedimentary environment, paleoclimate and paleoplant factors. The coal of Taiyuan Formation is mainly formed in the coal-forming environment of lagoon peat swamp, and the coal of Shanxi Formation is mainly formed in the coal-forming environment of delta plain peat swamp. On this basis, a coal accumulation model suitable for the study area has been established. This study plays an important supporting role in the evaluation of oil and gas resource potential in the study area.
冀中坳陷 / 上古生界 / 煤系烃源岩 / 地化特征 / 生烃动力学 / 聚煤模式 / 沉积学 / 油气地质.
Jizhong depression / Upper Paleozoic / coaly source rock / geochemical characteristics / hydrocarbon generation kinetics / coal accumulation mode / sedimentology / petroleum geology
P631
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