鄂尔多斯盆地临兴地区下石盒子组不同粒级砂岩成岩演化及孔隙定量研究

发布时间：2018-03-23 00:19

本文选题：鄂尔多斯　切入点：下石盒子组　出处：《沉积学报》2017年01期 　论文类型：期刊论文

【摘要】：利用鄂尔多斯盆地临兴地区下石盒子组铸体薄片、扫描电镜、阴极发光、包裹体分析,地球化学等资料,通过统计与计算等方法,对研究区下石盒子组不同粒级砂岩的岩石学特征,成岩演化序列以及埋藏过程中孔隙的定量演化进行研究。结果表明:1岩石学组成中,粗砂岩刚性颗粒含量高,塑性颗粒则多集中在细砂岩中;粗砂岩中硅质胶结、碳酸盐胶结含量较高,中、细砂岩以高岭石胶结为主。2成岩演化阶段中,粗砂岩经历的成岩作用较为完全,而细砂岩在早成岩B期就已经基本致密化,中砂岩则为二者的过渡型。3二叠世—中晚三叠世为准同生—早成岩B阶段,成岩作用以压实为主,其对细砂岩孔隙度影响最大;晚三叠世—中侏罗世为中成岩A阶段,成岩作用以溶蚀和胶结为主,粗砂岩溶蚀作用较强,孔隙度较高,细砂岩基本不发育溶蚀和胶结作用;中侏罗世之后,成岩阶段达到了中成岩B,以亚铁碳酸盐胶结为主,粗砂岩受到胶结作用较强,降低了一定孔隙度,但物性依然较好,粗、中、细砂岩最终孔隙度分别为11.07%、6.08%及2.60%。综上所述,粗砂岩由于压实作用较弱,溶蚀作用较强,可以形成良好的储集空间,中砂岩主要受控于压实和胶结作用的双重影响,形成次一级的储集空间,而细砂岩以压实破坏为主,物性相对最差。
[Abstract]:By means of statistical and computational methods, the shallow-Shihezi formation of the Lower Shihezi formation, Ordos Basin, was used to cast thin sheet, scanning electron microscope, cathodoluminescence, inclusion analysis, geochemistry and so on. The petrological characteristics, diagenetic evolution sequence and quantitative evolution of pores in the buried process of different grained sandstone in Xiashihezi formation are studied in the study area. The results show that the content of rigid grains in coarse sandstone is high in the petrological composition of 1: 1. The content of siliceous cementation and carbonate cementation in coarse sandstone is relatively high, and the diagenesis of coarse sandstone is relatively complete during the diagenetic evolution stage of kaolinite cementation, which is dominated by kaolinite cementation. The fine sandstone has been densified basically in the early diagenetic stage B, while the middle sandstone is the transitional type of stage B of the Permian to the middle and late Triassic. The diagenesis is dominated by compaction, which has the greatest influence on the porosity of fine sandstone. The late Triassic-Middle Jurassic is the stage A of middle diagenesis, the diagenesis is dominated by dissolution and cementation, the dissolution of coarse sandstone is stronger, the porosity of coarse sandstone is higher, and the fine sandstone has not developed dissolution and cementation, and after the Middle Jurassic, The diagenetic stage reached the middle diagenetic B, mainly ferrous carbonate cementation, the coarse sandstone was strongly cemented, and the porosity was decreased, but the physical properties were still good. The final porosity of the fine sandstone was 11.076.08% and 2.60%, respectively. In summary, the final porosity of the fine sandstone is 11.076.08% and 2.60% respectively. Due to weak compaction and strong dissolution, coarse sandstone can form a good reservoir space. The medium sandstone is mainly controlled by the dual effects of compaction and cementation, forming a secondary reservoir space, while the fine sandstone is dominated by compaction failure. Physical properties are relatively the worst.
【作者单位】：低渗透油气田勘探开发国家工程实验室;甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室;中国科学院大学;中国石油长庆油田分公司勘探开发研究院;青岛地质工程勘察院;中国科学院兰州文献情报中心;正元地理信息有限责任公司山东分公司;
【基金】：低渗透油气田勘探开发国家工程实验室开放课题(2016GSKJ05-01) 国家自然科学基金(41502142) 中国科学院油气资源研究重点实验室开放基金(KFJJ2013-02);中国科学院西部行动计划(KZCX2-XB3-12) 甘肃省重点实验室专项(1309RTSA041)~~
【分类号】：P618.13

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