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利用普通薄片、铸体薄片、扫描电镜、物性分析、测井解释和粒度分析等资料,对松辽盆地大安油田下白垩统泉头组四段特低渗—超低渗储集层成岩作用类型、成岩作用强度及其影响因素等进行了研究。结果表明:(1)压实作用是导致大安油田泉四段特低渗—超低渗储集层物性变差最主要的成岩作用。研究区储集层压实程度为中等,压实破坏程度与储集层复合砂体厚度、分选系数、泥质含量等参数具有较好的相关性。(2)胶结作用是研究区储集层物性变差的又一重要因素。区内胶结作用强度较弱,胶结作用减孔率与相对构型界面的位置、石英绝对含量、碎屑组分含量和杂基含量等因素具有明显的相关性。(3)溶蚀作用对区内储集层物性的改善程度相对较小。溶蚀作用增孔率与复合砂体厚度、杂基含量具有一定的相关性。压实、胶结、溶蚀作用对储集层物性改造程度影响因素的分析结果,反映砂体的垂向叠置关系、河道厚度规模、水动力强度等沉积特征对成岩作用类型及其强度有一定的控制作用。
The diagenesis types of the ultra-low permeability and ultra-low permeability reservoirs in the fourth member of the Lower Cretaceous Quantou Formation in Daan Oilfield, Songliao Basin, are studied by using ordinary thin slices, cast thin slices, scanning electron microscopy, physical properties analysis, log interpretation and particle size analysis , Diagenetic intensity and its influencing factors were studied. The results show that: (1) Compaction is the most important diagenesis which leads to the deterioration of physical properties of ultra-low permeability and ultra-low permeability reservoirs in the fourth member of Quan’an Oilfield. The degree of compaction of the reservoir in the study area is moderate, and the degree of compaction failure has a good correlation with the parameters of reservoir sandbodies thickness, sorting coefficient and shale content. (2) Cementation is another important factor for the deterioration of reservoir physical properties in the study area. The cementation strength in the area is weak, and the porosity-reduction rate of cementation has obvious correlation with the relative position of interface, the absolute content of quartz, the content of debris and the content of hetero-impurity. (3) Dissolution effect on reservoir properties in the area to improve the relatively small degree. Porosity of dissolution and the thickness of complex sand body and the content of miscellaneous group have a certain correlation. The result of compaction, cementation and dissolution on the influencing factors of physical property alteration of the reservoir reflects the vertical superimposition of sand bodies, the sedimentary characteristics such as river channel thickness scale and hydrodynamic strength, which have a certain influence on the diagenesis type and intensity Control effect.