台缘微生物礁结构特点及储集层主控因素——以塔里木盆地阿克苏地区下寒武统肖尔布拉克组为例

发布时间：2018-06-11 20:22

本文选题：微生物礁 + 凝块石　；参考：《石油勘探与开发》2017年03期

【摘要】：基于5条野外露头剖面、162块薄片、12块扫描电镜(SEM)样品及52套孔渗物性数据等资料,分析塔里木盆地阿克苏地区下寒武统肖尔布拉克组台缘微生物礁的结构特点及储集层主控因素。台缘由小型微生物礁群组成,单一礁体可分为前礁相、礁前相、礁脊相、礁后相,镜下可见礁岩具有不同的显微结构。微生物礁发育微生物结构储集空间和非生物结构储集空间,前者包括窗格孔、格架孔、铸模孔及超大溶孔,后者包括微裂缝和缝合线。孔渗数据统计结果表明:于提希剖面微生物礁孔隙度基本小于5%,渗透率一般小于1.0×10~(-3) μm~2,主要为特低孔特低渗储集层,而苏盖特布拉克剖面孔隙度多为3%~10%,渗透率为(0.1~50.0)×10~(-3) μm~2,整体跨度较大,且礁内物性非均质性较强,主要为低—中孔、低—中渗储集层。说明不同微生物礁的物性特征具有较大的差异,同一微生物礁内亦具有明显的储集非均质性。古地貌特征控制微生物礁的发育,沉积作用控制相带的展布及原生孔隙的发育,而溶蚀作用受控于古地貌特征和沉积作用,最终决定微生物礁储集层孔隙的演化。
[Abstract]:Based on the data of 162 thin sheets and 12 SEM SEM samples from 5 outcrops in the field, and 52 sets of pore and osmotic properties data, etc. The structural characteristics and reservoir control factors of microbe reefs in the platform margin of the Lower Cambrian Sholburak formation in Aksu area of Tarim Basin are analyzed. The single reef body can be divided into the front reef facies, the reef front facies, the reef ridge facies, the reef rear facies. The reef rock has different microstructure under the mirror. Microbial reef developed microbial structure storage space and abiotic structure storage space, the former includes pane hole, lattice hole, mold hole and super solution pore, and the latter includes micro-crack and suture line. The statistical results of pore and permeability data show that the porosity of microbe reef is less than 5 and the permeability is generally less than 1.0 脳 10 ~ (-3) 渭 m ~ (-2) in Yushi profile, which is mainly very low porosity and low permeability reservoir. The porosity of Sugait-Blak section is 3 ~ 1010, permeability is 0.1 ~ 50.0 脳 10 ~ (-3) 渭 m ~ (-2), the whole span is large, and the heterogeneity of physical properties in the reef is strong, mainly low to medium porosity and low to medium permeability reservoir. The results show that the physical properties of different microbial reefs are different, and the reservoir heterogeneity is also obvious in the same microbial reef. Paleogeomorphic features control the development of microbial reefs, sedimentary processes control the distribution of facies belts and the development of primary pores, while dissolution is controlled by paleogeomorphic characteristics and sedimentary processes, which ultimately determines the evolution of pores in microbial reefs.
【作者单位】：中国石油勘探开发研究院;北京大学地球与空间科学学院;中国石化石油勘探开发研究院;
【基金】：国家油气重大专项(2016ZX05004-001) 中国石油天然气股份有限公司勘探开发研究院院级超前基础研究项目(2015yj-09)
【分类号】：P618.13

【相似文献】