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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。
Based on the results of core observation and slice identification, scanning electron microscopy and X-ray diffraction analysis of core of Jurassic Badaowan Formation in Zhongguai, the petrological characteristics, pore types, pore-throat structure characteristics and physical properties of the reservoirs are studied. The results show that the middle Jurassic sandstones of Jurassic Badaowan Formation in Zhongguai Bulge are mainly sandstone, with gradual coarseness from August 1 to August 3 with low component maturity, low shale content and low cement content, medium Structure maturity characteristics; the reservoir type is mainly low porosity and low permeability reservoir, a small number of mesoporosity permeability, the main development of primary intergranular pores and residual intergranular pores, followed by intergranular dissolved pores, the degree of intragranular dissolution pores Low, showing fine throat pore throat structure characteristics. Based on this analysis, the influencing factors of reservoir physical properties are analyzed. The results show that sedimentary microfacies is the main factor controlling the development of the Badaowan Formation reservoir. The coarse grain size sandstone tends to be of better physical properties and is of relatively high quality ; The primary pore loss caused by compaction accounts for more than 50%, which is the primary factor of primary pore loss during diagenesis. The primary pore loss caused by cementation is about 14%, which is the secondary factor of reservoir pore loss. The dissolution The development of more than 40% dissolved pores in the study area is very important for the improvement of reservoir properties.