鄂西地区寒武系牛蹄塘组页岩孔隙特征与控制因素研究
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中国地质大学(北京)能源学院

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中图法分类号 TE132 P624; 文献标识码 A

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中国地质调查局鄂西页岩气示范基地拓展区战略调查项目(DD20189812)资助


Pore characteristics and controlling factors of Cambrian Niutitang Formation shale in Western Hubei
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School of Energy Resources,China University of Geosciences,Beijing

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    摘要:

    为明确鄂西地区寒武系牛蹄塘组页岩孔隙特征与控制因素,运用X射线衍射、扫描电镜、低温液氮吸附实验,定性划分页岩微观孔隙类型,并对其孔径分布和比表面积进行定量表征,结合页岩基础地质特征,探讨了孔隙发育的主控因素。结果表明:研究区牛蹄塘组页岩干酪根以Ⅱ1为主,TOC和RO值较高,有利于生烃;孔隙度总体较低,渗透率区域差异性大,推测微裂隙发育差异可能是造成渗透率差异的原因;粘土矿物中伊利石含量较多,脆性指数均较大,一般在60%以上;通过扫描电镜观察,将研究区牛蹄塘组页岩孔隙类型分为粒间孔、粒内孔、晶间孔、有机孔、溶蚀孔和微裂缝;低温液氮吸附曲线均属于Ⅱ型吸附等温线,孔径主要集中于30-60nm之间,比表面积主要由孔径≤5nm的孔隙所提供,主要孔隙形态为墨水瓶孔和平行板状孔;分析孔隙发育主控因素,明确了总有机碳含量、热成熟度和粘土矿物对研究区牛蹄塘组页岩孔隙发育有较强的控制作用。

    Abstract:

    In order to clarify the pore characteristics and controlling factors of Cambrian Niutitang Formation shale in Western Hubei, X-ray diffraction, scanning electron microscopy and low-temperature liquid nitrogen adsorption experiments were used to qualitatively classify the micro pore types of shale, and quantitatively characterize the pore size distribution and specific surface area. Combined with the basic geological characteristics of shale, the main controlling factors of pore development were discussed. The results show that: the shale kerogen of Niutitang Formation in the study area is mainly Ⅱ1, with high TOC and RO values, which is conducive to hydrocarbon generation; the overall porosity is low, and the regional difference of permeability is large, so it is speculated that the difference of microfracture development may be the reason for the difference of permeability; the illite content in clay minerals is more, and the brittleness index is larger, generally more than 60%; through the observation of scanning electron microscope, the research results are as follows The pore types of Niutitang Formation shale are intergranular pore, intragranular pore, intergranular pore, organic pore, dissolution pore and microfracture; the low-temperature liquid nitrogen adsorption curve belongs to type II adsorption isotherm, the pore size is mainly between 30-60nm, the specific surface area is mainly provided by pores with pore size ≤ 5nm, and the main pore forms are ink bottle pore and parallel plate pore; the main controlling factors of pore development are analyzed, and the results show that the main pore types of Niutitang Formation shale are intergranular pore, intragranular pore, intergranular pore, organic pore, dissolution pore and microfracture It is confirmed that the total organic carbon content, thermal maturity and clay minerals have strong control on the pore development of Niutitang Formation shale in the study area.

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符芳亮,许浩,郭景震,等. 鄂西地区寒武系牛蹄塘组页岩孔隙特征与控制因素研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-03-06
  • 最后修改日期:2021-06-04
  • 录用日期:2021-06-07
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