四川盆地东部华蓥山地区龙潭组页岩气储层特征
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摘要
为了探讨四川盆地东部华蓥山地区龙潭组海陆过渡相富有机质泥页岩的储层特征及其主控因素,开展了有机地球化学、矿物组成、孔隙结构参数等分析测试。结果表明,研究区泥页岩普遍具有较高的总有机碳含量,平均为3.16%;干酪根类型以Ⅲ型为主,镜质体反射率平均为1.2%,达到中—高成熟阶段;矿物组成中黏土较为富集,平均含量为66.24%,主要由伊/蒙混层和伊利石组成;孔隙类型以黏土矿物层间孔和微裂缝为主,有机质孔不发育。泥页岩具有较高的比表面积和孔体积,均值分别为27.47m~2/g和0.042cm~3/g,与我国南方古生界海相龙马溪组页岩相当。通过相关性分析发现,泥页岩比表面积和孔体积与总有机碳含量呈负相关关系,而比表面积和孔体积与黏土矿物含量之间具有显著的正相关性,说明无机孔隙是该套泥页岩孔隙空间的主要贡献者,而并非有机质孔。伊/蒙混层中包含的微孔和中孔、以及伊利石中存在的中孔和大孔是泥页岩孔隙系统的主要构成。
In order to reveal shale gas reservoir characteristics and controlling factors of the Longtan Formation transitional organic-rich shales in Huayingshan area,eastern Sichuan Basin,organic geochemistry,mineral composition,and pore structure parameters were analyzed.The results show that the Longtan Formation shales are characterized by high TOCcontents averaged at 3.16%.The kerogen type was mainly typeⅢ,and the average vitrinite reflectance value is 1.2%,reaching moderate to high maturity stage.The clay mineral is concentrated in the Longtan Formation shale,with an average content of 66.24%,which is mainly composed of I/S mixed layer and illite.The main pore space is composed mainly of interbedded pores related to clay minerals and microcracks,and the organic matter pores are not developed.These shales usually have a high specific surface area and pore volume,with mean values of 27.47m~2/g and 0.042cm~3/g,respectively,which is approximate to the marine Longmaxi Formation shales in southern China.The specific surface area and pore volume have a negative relationship with TOCcontent,but have a significant positive relationship with clay mineral content,illustrating inorganic matter pores are the main contributor to shale pore space other than organic matter pores.The micro-to mesopores presenting in I/S mixed layer and meso-to macropores in illite are the main components to construct pore system of shales.
In order to reveal shale gas reservoir characteristics and controlling factors of the Longtan Formation transitional organic-rich shales in Huayingshan area,eastern Sichuan Basin,organic geochemistry,mineral composition,and pore structure parameters were analyzed.The results show that the Longtan Formation shales are characterized by high TOCcontents averaged at 3.16%.The kerogen type was mainly typeⅢ,and the average vitrinite reflectance value is 1.2%,reaching moderate to high maturity stage.The clay mineral is concentrated in the Longtan Formation shale,with an average content of 66.24%,which is mainly composed of I/S mixed layer and illite.The main pore space is composed mainly of interbedded pores related to clay minerals and microcracks,and the organic matter pores are not developed.These shales usually have a high specific surface area and pore volume,with mean values of 27.47m~2/g and 0.042cm~3/g,respectively,which is approximate to the marine Longmaxi Formation shales in southern China.The specific surface area and pore volume have a negative relationship with TOCcontent,but have a significant positive relationship with clay mineral content,illustrating inorganic matter pores are the main contributor to shale pore space other than organic matter pores.The micro-to mesopores presenting in I/S mixed layer and meso-to macropores in illite are the main components to construct pore system of shales.
引文
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