Analysis of reservoir-forming conditions and key controlling factors of Huagang Formation in the central anticlinal belt of Xihu Sag of East China Sea—Taking the reservoir H3 for example
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摘要: 近年来，西湖凹陷中央背斜带渐新统花港组油气勘探取得重要突破，发现多个大中型含油气构造，在不同的含油气构造中，气藏的气柱高度及圈闭充满度差别大，说明不同的含油气构造具有不同的成藏主控因素。基于三维地震及多口钻井资料，从烃源岩、圈闭条件、储盖组合配置关系等方面，以H3气藏为例，通过对典型气藏的解剖，对H3气藏的成藏条件进行研究，分析了不同构造气藏的成藏主控因素。结果表明，中央背斜带油气主要来自于始新统煤系烃源岩，渐新统花港组具备良好的圈闭条件及储盖组合配置关系，油气成藏主控因素为有效的输导体系，而良好的后期保存条件则是控制油气富集程度（油气充满度）的重要因素。Abstract: A great breakthrough in oil and gas exploration has been made recently from the Huagang Formation in the central anticline belt of the Xihu Sag. Several medium to large oil and gas fields have been discovered. However, the gas column height and fullness ratio of trap differs from each other which suggests that every reservoir has its own key controlling factors. Based on seismic and drilling data, this paper selects the H3 reservoir as a case to study the accumulation conditions of source rocks, traps and combination of reservoir-cap systems. Also this paper sums up the key controlling factor of each reservoir by dissecting four typical reservoirs. The results show that the oil and gas accumulated in H3 reservoir come from the source rocks in Pinghu Formation; the reservoir and caprocks matched each other excellently, and the key factors to control oil and gas accumulation are the effective migration system and fault sealing, and the reservoir preservation condition has great influence on hydrocarbon accumulation.
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Keywords:
- H3 reservoir /
- key controlling factors /
- Huagang Formation /
- central anticline belt /
- Xihu Sag
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图 1 西湖凹陷中央背斜带位置图及地层柱状图
Figure 1. The structural location of central anticlinal belt and the integrated stratigraphic column of Xihu Sag
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图 2 中央背斜带天然气C5-7系列化合物三角图
Figure 2. C5-7 components of natural gas of the central anticlinal belt
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图 3 中央背斜带天然气甲烷含量与重烃含量关系图
Figure 3. The relationship between CH4 and heavy hydrocarbon in natural gas of central anticlinal belt
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图 4 中央背斜带H1-H3砂层组储盖组合配置关系剖面图
Figure 4. Profile of reservoir-cap combination in H1-H3 sand groups of central anticlinal belt
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图 6 中央背斜带平湖组含油气系统事件图（测线位置见图1）
Figure 6. The oil and gas system events of Pinghu Formation of central anticlinal belt
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图 8 D构造西侧主控断层SGR图
Figure 8. The SGR diagram of controlling fault in the west of D structure
表 1 中央背斜带天然气、烃源岩碳同位素值
Table 1 Statistical table of carbon isotope value of natural gas and source rock in central anticlinal belt
碳同位素值/‰（样品数） 丁烷 花港组泥 花港组煤 平湖组泥 平湖组煤 G构造 −27.3（8） −26.7（5） − −26.4（2） − H构造 −23.7（3） −25.6（3） −24.5（1） − − C构造 −24.0（1） −26.2（19） −25.7（2） − − A构造 −27.1（9） − − − − B构造 −27.0（6） −26.4（4） − −25.8（7） −25.7（2） 
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表 2 H1-H3砂层组地层岩性统计
Table 2 The statistical table of lithology form sand group H1 to H3
A1 B1 C1 D1 E1 F1 G1 H1 H2 H3 H1 H2 H3 H1 H2 H3 H1 H2 H3 H1 H2 H3 H1 H2 H3 H1 H2 H3 地层厚度/m 173 110 135 195.5 126.7 143.5 143.5 152.6 193 257 131 185 267 254 255 254 271 265 188.5 280.5 256 砂岩厚度（粉砂及以上）/m 25 27.5 56.5 64.5 30.54 66 30.5 12 84 87 40 139 71 120.5 98 90 65 179 48 84.5 191.5 砂岩百分含量/% 14 25 42 33 24 46 21 8 43 34 31 75 27 47 38 35 24 68 25 30 75 泥岩厚度/m 140.5 62 61.5 128 128 72.5 93.5 107.5 88 168 81 37 150 107 122 129 143 75 130.5 171.5 58.5 泥岩百分含量/% 81 56 46 65 60 51 65 70 46 65 62 20 56 42 48 51 53 28 69 61 23
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表 3 中央背斜带典型构造油气藏参数
Table 3 Statistical table of carbon isotope value of natural gas and source rock in central anticlinal belt
构造名称 圈闭面积/km2 圈闭幅度/m 气水界面深度/m 综合解释结论 含气面积/km2 气柱高度/m 充满度/% 气水关系 气藏类型 B 32.0 140 −2781 气层 11.42 50 35.7 层状底水 构造气藏 C 23.6 50 − 水层 − − − − − D 12.4 20 − 含气水层 − − − − − F 42.65 232 −3812.2 气层 42.65 232 100 层状边水 构造气藏
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