鄂尔多斯盆地神府地区太原组致密砂岩储层特征及成岩演化

发布时间：2018-04-10 23:36

本文选题：储层特征 + 致密砂岩　；参考：《岩性油气藏》2017年06期

【摘要】：为阐明鄂尔多斯盆地神府地区太原组砂岩储层特征及其致密化成因,利用铸体薄片、扫描电镜、阴极发光及高压压汞等资料,分析胶结物及其与碎屑颗粒的胶结、交代作用,并研究了储层成岩序列、各类胶结物与孔隙的含量、孔隙度的演化过程等。结果表明:神府地区太原组储层以中—粗岩屑砂岩和长石岩屑砂岩为主,孔隙度为0.20%~12.00%,平均为6.95%,渗透率为0.10~5.00 m D,平均为0.91 m D,属于典型的低孔—特低孔、特低渗的致密砂岩储层;孔隙结构主要为小孔细喉和小孔微喉型;在孔隙演化中压实作用使孔隙度减少约15.5%,胶结作用减少孔隙约10.4%,溶蚀作用增加孔隙约4.41%,计算现今平均孔隙度为7.17%,与实测平均孔隙度6.95%相当。早期压实作用与晚期碳酸盐胶结作用是研究区储层致密的主要原因,而溶蚀作用有利于各类次生孔隙的发育,是改善储层孔渗性的关键因素。
[Abstract]:In order to elucidate the sandstone reservoir characteristics and densification factors of Taiyuan formation in Shenfu area, Ordos Basin, the cementation and metasomatism of the cementation and metasomatism of the cement and clastic particles were analyzed by using the data of casting thin sheet, scanning electron microscope, catholuminescence and high pressure mercury pressure.The diagenetic sequence of reservoir, the content of cemented matter and pore, and the evolution process of porosity are also studied.The results show that the reservoirs of Taiyuan formation in Shenfu area are mainly medium-coarse lithic sandstone and feldspathic lithic sandstone, the porosity is 0.20 ~ 12.00, the average is 6.95, the permeability is 0.10 ~ 5.00 mm D, and the average is 0.91 mm D, which is a typical tight sandstone reservoir with low porosity and very low permeability.The pore structure is mainly microlarynx and microlarynx.In the evolution of porosity, compaction reduces porosity by 15.5a, cementation reduces porosity by 10.4, dissolution increases porosity by about 4.41, and the average porosity is 7.17, which is equivalent to the measured average porosity of 6.95%.Early compaction and late carbonate cementation are the main reasons for reservoir compactness in the study area, while dissolution is beneficial to the development of various secondary pores and is the key factor to improve reservoir porosity and permeability.
【作者单位】：中海油能源发展股份有限公司工程技术分公司;
【基金】：中海油能源发展股份有限公司重大专项“非常规油气评价实验配套核心技术研究”(编号:HFKJ-CJFZ-1302)资助
【分类号】：P618.13

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