南堡凹陷高尚堡油田深层储层成岩作用及孔隙演化

Diagenesis and porosity evolution of deep Es32+3 Formation in Gaoshangpu Oilfield,
Nanpu Sag

 高阳 张建丽 李海燕 于兴河

中国地质大学（北京）能源学院，北京 100083 中国石化中原油田分公司信息化管理处，河南 濮阳 457001 中国石油大学（北京）地球科学学院，北京 102249）

School of Energy Resources, China University of Geosciences, Beijing 100083, China Information Management Center, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China College of Geosciences, China University of Petroleum, Beijing 102249, China)

利用薄片、扫描电镜、X衍射等多种分析、测试手段，对高尚堡地区深层沙河街组三段2+3亚段（Es32+3）的储层成岩作用与孔隙演化进行了系统研究。结果表明：储层主要经历了压实、胶结、溶解等成岩作用，目前处于早成岩B期与中成岩A期成岩阶段。由于塑性组分含量高，储层早期经历强烈的压实作用，原始孔隙度损失约20.8%；胶结物以碳酸盐为主。伴随有机质的热演化，早成岩B期开始长石等易溶矿物在有机酸的选择性溶解作用下发生溶蚀，开始出现石英次生加大与自生高岭石沉淀，同时蒙脱石向伊利石与绿泥石转化，伊/蒙混层由无序向有序过渡。中成岩A期砂岩原始孔隙已残留较少，长石、岩屑的溶解作用则贡献7.5%的次生孔隙，促成深层有利储层的发育。

 The diagenesis and porosity evolution are studied systematically by using the thin-section, SEM, and X-ray analysis. The results show that compaction, cementation and dissolution are the main diagenetic types of Es32+3. The present diagenetic stages of Es32+3 are classified as early stage B and middle stage A. Due to the abundance of plastic components, the primary porosity loss reaches 20.8%, as a result of compaction. Featured as carbonate cement, cementation shows relatively little impact on the reservoir. in the early stage B, feldspar dissolution is promoted by the release of organic acids, followed by quarts growth and authigenic kaolinite deposition. Meanwhile the montmorillonite changes to the illite and chlorite, and illite-montmorillonite mixed-layer tends to be in order. In the middle stage A, the primary porosity remains less, while the dissolution of feldspars and fragments contributes 7.5% of the secondary pores, which leads to the development of the favorable reservoir in deep formation.

10.6056/dkyqt201606005