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利用岩心观察、薄片鉴定、扫描电镜和X衍射分析等,对渤南洼陷沙三段0—9砂组浊积砂体的碎屑成分、结构和填隙物等岩石学特征进行了分析,结合该层段的孔隙结构、储集物性等特征,研究了浊积砂体的岩石学特征对储层物性的影响。结果表明,研究区岩石类型以岩屑长石砂岩为主,成分成熟度较低,结构成熟度中等。浊积砂体的储层物性随着岩石成分成熟度、结构成熟度的增高而变好,而岩屑、填隙物含量的增加会使储集物性变差。因此,储集物性好的储层应具有石英含量高、岩屑含量和填隙物含量低、粒度大、分选系数小的特点。
The petrological characteristics such as detrital composition, structure and interstitial of the turbidite sand bodies in the 0-9 sand group of the Es 3 Member in the Bonan Sag are analyzed by core observation, thin slice identification, scanning electron microscopy and X-ray diffraction analysis. Combined with the characteristics of pore structure and reservoir properties in this interval, the influence of petrological characteristics of turbidite bodies on reservoir physical properties was studied. The results show that the rock types in the study area are mainly lithic feldspar sandstone with low maturity and medium maturity. The reservoir physical properties of turbidite sand bodies become better with the increase of maturity and structural maturity of rock components, and the increase of lithic fragments and interstitials will deteriorate the reservoir properties. Therefore, reservoirs with good reservoir properties should have the characteristics of high quartz content, low cuttings content and interstitial content, large particle size and small sorting coefficient.