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通过岩石薄片、铸体薄片、扫描电镜、X-射线衍射等多种分析测试方法,对西湖凹陷中央隆起带古近系花港组储层特征及成岩孔隙演化特征进行了详细研究。研究表明:研究区古近系花港组砂岩类型主要为长石岩屑质石英砂岩,其成分成熟度和结构成熟度均为中等;成岩作用是控制该区储层物性的关键因素,其中压实作用和胶结作用主要为破坏性成岩作用,溶蚀作用则为建设性成岩作用,其形成的次生孔隙极大地改善了储层物性;古地温、有机质镜质体反射率等资料显示,北部宁波—嘉兴地区成岩演化进程稍快,花港组埋深大于3 600m开始进入中成岩B期,而南部天外天—黄岩地区总体上仍为中成岩A期,因而南部较北部具有更良好的储集条件。
The characteristics of the Huaguang Formation reservoir and the evolution of diagenetic porosity in the Central Uplift of the Xihu Sag have been studied in detail by means of rock thin slices, cast thin slices, scanning electron microscopy and X-ray diffraction. The results show that the sandstone types of the Huayang Formation in the Paleogene in the study area are mainly feldspar-bearing quartzite sandstones, and their maturity and structural maturity are medium. Diagenesis is the key factor that controls the reservoir physical properties. The pressure The main action and cementation are mainly damaging diagenesis, and the dissolution is constructive diagenesis. The formation of secondary porosity greatly improves reservoir physical properties. Paleo-geothermal and organic matter vitrinite reflectance data show that the northern part of Ningbo - The evolution of diagenesis in Jiaxing is slightly faster. The burial depth of Huagang Formation is larger than 3 600m and begins to enter the middle diagenetic stage B, while the southern Tianweidian-Huangyan area is still generally diagenetic stage A, so the southern part has a better reservoir than the northern part condition.