Characteristics of gas reservoir and controlling factors for gas accumulation in the Huagang Formation in Y Structure, Xihu Sag
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摘要: 以常规和非常规油气成藏理论为指导，结合储层、流体等测试分析结果，开展西湖凹陷Y构造花港组气藏特征及成藏主控因素研究。结果表明：① 花港组垂向上符合中下部致密砂岩气、上部常规天然气藏的分布序列；② 常规气藏气水关系正常，受断盖配置对沿断裂运移油气的封闭作用和断层侧向封堵能力影响，油气主要在区域盖层之下的断背斜顶部富集；③ 致密气藏具叠覆跨越源储组合关系，含气饱和度低，无明显气水界面，属先致密后成藏类型，不同部位含气性受构造幅度和储层物性共同控制。本次研究丰富和完善了西湖凹陷常规-非常规天然气序列成藏规律，并为致密砂岩气的勘探提供理论指导。Abstract: Following both the conventional and unconventional oil and gas accumulation theories, and upon the basis of the experimental and testing results of the reservoirs and fluids, this paper studied the characteristics of gas reservoirs and the controlling factors on hydrocarbon accumulation in the Huagang Formation in the Y structure of Xihu Sag. And the following research results are obtained. ① there is a vertical distribution pattern of gas accumulation from the middle and lower tight sand gas to upper conventional reservoir gas in the Huagang Formation of the study area. ② Influenced by the sealing of matched fault and cap rock system to oil-gas migration through faults and by lateral migration, the conventional gas reservoirs with a normal gas-water contact are formed and distributed at the top of fault-anticline traps below the regional caprock. ③ The tight sand reservoirs are characterized by separated source-reservoir system, low gas saturation, complex gas-water relationship, and antecedent tight sand reservoir. Reservoirs which have different porosity and located in different structural heights have different gas saturation. The result has an important significance for the study of the accumulation models of the conventional and unconventional gas reservoirs in the Xihu Sag and will provide a guidance for exploration of the tight sand gas.
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Keywords:
- tight sand reservoir /
- controlling factor /
- Xihu Sag /
- Huagang Formation
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图 2 Y构造SE向气藏剖面（a）、H3含气面积图（b）及H3沉积相分布图（c）
Figure 2. SE-direction gas reservoir profile（a）, the gas bearing area of H3（b）, and the depositional facies distribution of H3（c）of Y structure
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图 3 研究区花港组储层及流体分布特征
Figure 3. Distribution of reservoirs and fluids in the Huagang Formation of Y Structure
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图 4 研究区花港组储层孔喉特征
Figure 4. Pore-throat characteristics of the Huagang Formation reservoir in Y structure
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图 5 研究区花港组储层致密化与油气充注关系图
Figure 5. Relationship between sandstone reservoirs densification and hydrocarbon charging in the Huagang Formation of Y structure
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图 6 研究区花港组常规气藏与断层-盖层关系
Figure 6. Relationship between fault-caprock system and the conventional gas reservoirs in the Huagang Formation of the study area
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图 7 研究区花港组致密气藏含气饱和度与储层物性和构造幅度关系
Figure 7. Relationship between physical properties or structural amplitude and gas saturation of the tight sandstone gas reservoirs in Huagang Formation of the study area
表 1 研究区断裂特征
Table 1 Fault features of Y structure
断层 性质 期次 断距/m 断裂产状 区内延伸
长度/km断开
层位T20 T23 T24 T25 T30 走向 倾向 F1 正断层 断陷期-反转期 25～50 10～25 25～75 25～150 NE SE 20.8～49.6 T23-T34 F2 逆断层 反转期 25～150 50～175 75～150 75～125 NE SE 46.9～53.7 T23-T30 F3 正断层 断陷期 10～25 25～75 NNE SEE 7.3～41.2 T25-T34 
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表 2 研究区花港组致密气藏物性、幅度和含气饱和度特征
Table 2 Characteristics of physical properties, structural amplitude and gas saturation for the tight sandstone gas reservoirs in the Huagang Formation of the study area
构造单元 井名 层位 序号 深度/m 幅度/m 孔隙度/% 渗透率/10-3 μm2 含气饱和度/% A区 YY1 H5 1 4648.3 160 7.8 0.33 40.5 2 4660.1 8.5 0.44 42 均值 8.2 0.39 41.3 YY1 H6 1 4787.3 150 7.1 0.25 40 YY1 H7 1 4848.8 170 7 0.24 49 YY1 H8 1 4961.7 220 7.1 0.25 40 2 4995.3 7.1 0.24 40 3 4999.4 7 0.24 40 4 5036.7 7 0.24 46 5 5068.9 7.1 0.25 41.4 6 5086 7 0.24 40 均值 7.1 0.24 41.2 B区 YY2 H5 1 4611.8 20 7.6 0.3 49.7 YY2 H6 1 4659.1 40 7.8 0.32 55 2 4672.5 7.9 0.34 50 3 4679.5 7.6 0.31 48.9 4 4703.6 7.7 0.31 50.2 均值 7.8 0.32 51 YY2 H7 1 4801.6 100 7.6 0.3 59.8 2 4806.8 7.4 0.28 49.6 3 4837.3 8 0.35 44.6 均值 7.7 0.31 51.3
YY2H9 1 5070.8 270 7.8 0.33 51.8 2 5088.6 7.7 0.32 43.9 3 5099.2 8.1 0.38 52.9 均值 7.9 0.34 49.5
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