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王晓蕾,曹正杰,杨强强,等. 川东地区龙潭组页岩气成藏地质条件与有利区评价[J]. 科学技术与工程, 2020, 20(20): 8139-8145.
王晓蕾,et al.Study on the Accumulation Conditions of Shale Gas in Longtan Formation in Eastern Sichuan Basin[J].Science Technology and Engineering,2020,20(20):8139-8145.
川东地区龙潭组页岩气成藏地质条件与有利区评价
Study on the Accumulation Conditions of Shale Gas in Longtan Formation in Eastern Sichuan Basin
投稿时间:2019-09-29  修订日期:2020-04-02
DOI:
中文关键词:  川东地区  龙潭组 页岩气  成藏条件
英文关键词:shale  gas accumulation  condition longtan  formation eastern  sichuan basin
基金项目:
                             
作者单位
王晓蕾 lvliang University
曹正杰 中国石油青海油田分公司采油二厂
杨强强 中国石油青海油田分公司采油二厂
毛 芮 中国石油青海油田分公司采油二厂
宁 闯 吕梁学院
王鸿宇 吕梁学院
赵 权 吕梁学院
梁家林 吕梁学院
王 真 吕梁学院
陈嘉欣 吕梁学院
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中文摘要:
      为查明川东地区龙潭组泥页岩成藏地质条件,通过对泥页岩沉积环境、有机质丰度、泥页岩厚度、有机质热演化程度、储集空间类型及孔渗性分析。结果表明:川东地区龙潭组富有机质泥页岩形成于浅水陆棚及深水陆棚还原性沉积水体,泥页岩厚度以宣汉-开江-云阳地区为中心向四周减薄,泥页岩平均厚度在50m以上,有机质丰度介于0.47%~12.3%,平均含量为3.86%,宣汉-开江-云阳一带有机质平均含量最高。有机质显微组分主要为镜质组及惰质组,干酪根δ13Cker介于-25.4‰~-22.1‰,表明干酪根类型为Ⅲ型,有机质来源主要为高等植物。有机质成熟度呈现区域性差异变化,华蓥山地区有机质镜质体反射率介于0.84%~1.46%,平均为1.09%,处于低成熟阶段,其它地区有机质镜质体发射率介于2.23%~3.14%之间,平均为2.73%,处于过高-成熟阶段,生烃强度大,显示了良好的生烃条件。储层粘土矿物含量普遍较高,主要储积空间为无机质孔隙及微裂缝,有机质孔少量发育,龙潭组泥页岩总孔体积及比表面积相对较高,其中中孔对总孔体积及比表面积的贡献最大,渗透率适中,裂缝的存在有效改善储层渗透性。综合生烃条件及储积条件认为川东地区东北部的宣汉-开江-云阳地区为龙潭组泥页岩为勘探的最有利区。
英文摘要:
      In order to find out the geological conditions of shale formation in Longtan Formation in eastern Sichuan, the sedimentary environment, abundance of organic matter, thickness of shale, degree of thermal evolution of organic matter, type of reservoir space and porosity and permeability of shale are analyzed. The result shou that the organic rich shale of Longtan Formation in east sichuan province was formed in shallow and deep water shelf reductive sedimentary bodies, The thickness of mud shale is thinner around Xuanhan-Kaijiang -Yunyang area. The average thickness of mud shale is more than 50m, and the abundance of organic matter is between 0.47% and 12.3%, with an average content of 2.86%. The average content of organic matter in xuanhan-kaijiang-yunyang area is the highest, The microscopic components of organic matter are mainly vitrinite and inertinite. Kerogen δ13Cker ranges from -25.4 ‰ to -22.1 ‰, indicating that kerogen type is type III, and the source of organic matter is mainly higher plants. Organic matter maturity varies regionally, The Ro of organic matter in Huaying Mountain area is between 0.84% to 1.46%, with an average of 1.09%, which is in the low mature stage. The Ro organic vitrinite in other areas is between 2.23% to 3.14%, with an average of 2.73%. It is in the stage of excessive to mature, and the hydrocarbon generation intensity is high, which shows good hydrocarbon source conditions. The clay mineral content of the reservoir is generally high, the main storage space is inorganic pores and micro fractures, and the organic pores is little development. The total pore volume and specific surface area of shale in Longtan Formation are relatively high, and the contribution of mesoporous to the total pore volume and specific surface area is the largest, the permeability is moderate, and the existence of fractures effectively improves reservoir permeability. Based on the hydrocarbon generation conditions and storage conditions, it is considered that the Xuanhan-Kaijiang-Yunyang area in the northeast of eastern Sichuan is the most favorable area for exploration of the shale of Longtan formation..
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