准噶尔盆地中拐凸起侏罗系八道湾组储层特征及控制因素

发布时间：2018-07-15 11:11

【摘要】：综合中拐凸起侏罗系八道湾组岩心观察结果及薄片鉴定、扫描电镜、X-射线衍射等分析化验结果,研究其储层岩石学特征、孔隙类型、孔喉结构特征及物性特征等,结果表明:中拐凸起侏罗系八道湾组储层主要为中细砂岩,从八一段到八三段粒度渐粗,具有低成分成熟度、低泥质含量、低胶结物含量、中等结构成熟度特征;其储层类型主要为低孔低渗储层,少数为中孔中渗,主要发育原生粒间孔及残余粒间孔隙,其次为粒间溶孔,粒内溶孔发育程度低,呈现细喉道孔喉结构特征。以此为基础对储层物性的影响因素进行分析,结果显示:沉积微相是控制该区八道湾组储层发育的主要因素,粒级粗的砂岩往往物性更佳,是相对优质的储层;压实作用造成的原始孔隙损失占50%以上,是成岩过程中原生孔隙损失的主要因素,胶结作用造成的原始孔隙损失约为14%,是造成储层孔隙损失的次要因素;溶蚀作用造成了研究区内40%以上溶蚀孔隙的发育,对于储集性能的改善有极为重要的作用。
[Abstract]:Based on the core observation and thin section identification of the Jurassic Badaowan formation of the Zhongguai uplift, and the analysis results of scanning electron microscope (SEM) and X-ray diffraction (SEM), the petrological characteristics, pore types, pore throat structure and physical properties of the reservoir are studied. The results show that the reservoir of the Jurassic Badaowan formation in Zhongguai uplift is mainly medium fine sandstone with coarse granularity from Bayi formation to 83 member, with low composition maturity, low clay content, low cementation content and middle structure maturity characteristic. The reservoir types are mainly low porosity and low permeability, and a few are middle pore and middle permeability. Primary intergranular pore and residual intergranular pore are mainly developed, followed by intergranular dissolved pore and low developed degree of intragranular dissolved pore, showing fine throat pore throat structure characteristics. The results show that sedimentary microfacies are the main factors controlling the reservoir development of Badaowan formation in this area, and the coarse grain sandstone is usually better in physical properties and is a relatively high quality reservoir. The primary pore loss caused by compaction is more than 50%, which is the main factor of primary pore loss during diagenesis, and the original pore loss caused by cementation is about 14%, which is the secondary factor of pore loss in reservoir. The dissolution resulted in the development of more than 40% of the solution pores in the study area, which played an extremely important role in improving the reservoir performance.
【作者单位】：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;
【基金】：国家自然科学基金青年科学基金项目(编号:41503048)资助
【分类号】：P618.13

【相似文献】