Characteristics and classification of the Paleogene reservoirs in Huagang Formation of Gas Field N, East China Sea Basin
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摘要:
东海陆架盆地西湖凹陷古近系花港组储层为典型的低孔、低渗储层。基于大量岩心物性、粒度、薄片、压汞等资料，对N气田目的层储层岩性、物性和孔隙结构特征进行精细评价。结果表明：N气田花港组储层岩性以细砂岩为主，矿物成分构成稳定，以石英为主，黏土含量低，岩性较纯；随着埋藏变深，孔隙变差，粒间孔减少，溶蚀孔增加，孔喉半径减小，连通性变差；局部发育砂砾岩，且渗透率大于细砂岩一个数量级以上，可作为甜点储层开发。基于实验和试油资料统计结果，建立了一套适用于花港组储层的综合分类评价标准，包含孔隙度、渗透率、饱和度和地质特征4类储层重要参数，分类结果特征鲜明，分类依据科学可靠，为该区域低孔、低渗储层勘探开发提供依据。
Abstract:The Paleogene Huagang Formation in the N gas field of Xihu Sag in the East China Sea Basin is a typical tight reservoir of low-porosity and low-permeability. Based on a large number of testing data for core property, particle size, thin section and mercury testing, the lithology, physical properties and pore structures of the reservoirs in the gas field N are carefully studied in this paper. The Huagang Formation is dominated by fine quartz sandstone with little clay. With the increase in burial depth, the intergranular pores decrease, the dissolution pores increase, and the porosity becomes worse in general, as the pore throat diameter is reduced and the connectivity deteriorated. Glutenite sometimes occurs locally, the permeability of which is more than one order higher than that of the fine sandstone, and thus becomes sweet areas for oil production. Based on the statistical results of testing data, a comprehensive evaluation standard specially applicable to the Huagang reservoir is established, which contains four important reservoir parameters, namely porosity, permeability, saturation and geological features. The classification results are distinctive and reliable. Facts prove that it is an effective tool for exploration and development of tight low-porosity and low-permeability reservoirs in the region.
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表 1 N气田花港组储层矿物成分统计
Table 1. Mineral composition of Huagang reservoir in gas field N
% 层位 石英 长石 岩屑 胶结物 钾长石 斜长石 火成岩 变质岩 沉积岩 方解石 白云石 黏土 其他 花港组上段 64.15 7.79 10.05 6.70 8.17 3.02 1.34 0.23 6.49 1.01 花港组下段 63.60 7.74 9.52 6.79 9.19 3.16 2.24 0.44 7.06 0.93 
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表 2 东海盆地N气田古近系花港组低渗储层分类标准
Table 2. The classification standard of Huagang low porosity and low permeability reservoir in gas field N of East China Sea Basin
储层分类 Ⅰ（中高渗） Ⅱ（低渗） Ⅲ1（特低渗） Ⅲ2（特低渗） Ⅳ（超低渗） 渗透率 空气渗透率/mD ＞10 10～1 1～0.5 0.5～0.2 ＜0.2 覆压渗透率/mD ＞7 7～0.24 0.25～0.1 0.1～0.026 ＜0.026 孔隙度 总孔隙度/% ＞15 15～10 10～6 ＜6 可动孔隙度/% ＞12 12～8 8～4 ＜4 饱和度 束缚水饱和度/% ＜35 35～50 50～65 ＞65 地质特征 分选 中、中-差 中-差、差 差 差 差 接触方式 点、点-线 点-线、线 线-点、线 线-点、凹凸-线 线、凹凸-线 孔隙类型 原生粒间孔
少量粒间溶孔原生粒间孔
粒间溶孔大量粒间溶孔
粒内溶孔
少量原生粒间孔大量粒间溶孔
粒内溶孔
铸模孔粒间溶孔
粒内溶孔岩性 中砂岩
砂砾岩砂砾岩
含砾砂岩细砂岩
含砾砂岩细砂岩
粉砂岩粉砂岩
细粉砂岩
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