The Source and Natural Gas Lateral Migration Accumulation Model of Y8-1 Gas Bearing Structure, East Deep Water in the Qiongdongnan Basin
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摘要: 综合钻井天然气地球化学、地震资料，分析了琼东南盆地深水东区Y8-1构造天然气成因、来源及侧向运聚模式.天然气轻烃C6、C7组成分析表明，Y8-1构造天然气既有别于松东凹陷北坡的油型气，也不同于深水L17-2气田的煤型气.根据天然气乙烷、丙烷碳同位素特征，判断Y8-1构造天然气具有煤型气和油型气混合成因特征.选择盆地东部典型煤型气、油型气作为端元，计算得到Y8-1构造天然气中煤型气占53.3%、油型气占46.7%，分别来源于松南-宝岛凹陷下渐新统崖城组陆源海相烃源岩、始新统湖相烃源岩，两套烃源岩均具备生成成熟-高成熟天然气的地质条件.松南-宝岛凹陷中烃源岩生成的天然气沿断裂、构造脊、砂岩层侧向长距离运移，在Y8-1崖城组、花岗岩基岩圈闭中聚集成藏.Abstract: Based on the geochemical analyses of natural gases and seismic exploration data,the genesis,sources and lateral migration accumulation of Y8-1 bearing structure were comprehensively analyzed in the East deep water of the Qiongdong Basin. The analyses of C6,C7 light hydrocarbons show that the natural gas of the Y8-1 bearing structure is different from oil-type gas in the northern slope of Songdong sag,and coal-type gas of L17-2 gas field in the deepwater as well. According to the ethane and the propane carbon isotope,the natural gas in the Y8-1 bearing structurehas the mixing characteristics of coal-type gas and oil-type gas. The typical coal-type gas and the oil-type gas in the east Qiongdongnan Basin are selected to be end elements,the natural gas ethane carbon isotope of the Y8-1 bearing structure is calculated as coal-type gas for 53.3% and oil-type gas for 46.7% in the natural gas. The Y8-1 mixing source gas derived from the terrestrial marine source rock of Lower Oligocene Yacheng formation and Eocene lacustrine source rock in Songnan-Baodao sag respectively,and both sets of source rocks have geological conditions for the formation of mature-high mature natural gas. The natural gas generated from the source rocks in the Songnan,Baodao sags migrates along the tectonic ridges,faults,and sandstone carriers for a long distance,thenaccumulatedin the Yacheng formation and granite basement traps in the Songnan low-uplift,East deep water of the Qiongdong Basin.
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Key words:
- genesis of the natural gas /
- light hydrocarbon /
- carbon /
- mixing source gas /
- east deep water /
- Qiongdongnan Basin
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图 2 琼东南盆地及邻区天然气乙烷碳同位素（δ13C2）和丙烷碳同位素（δ13C3）相互关系
Fig. 2. Correlation between ethane carbon isotope(δ13C2) and propane carbon isotope(δ13C3)of the varied natural gases in the Qiongdongnan Basin and adjacent basins
图 3 琼东南盆地天然气轻烃石蜡指数-庚烷值关系
Fig. 3. Relationship between paraffin index and heptane value of natural gas light hydrocarbon in Qiongdongnan Basin
图 4 松南-宝岛凹陷-Y8-1典型剖面5.5 Ma以来构造发育史
Fig. 4. Structural development history since the typical 5.5 Ma of Songnan-Baodao sag across Y8-1
图 5 （a）过Y8-1含气构造地震剖面；（b）Y8-1天然气侧向运聚模式
Fig. 5. (a)The seismic section crossing Y8-1;(b)Lateral migration-accumulation mode of Y8-1
表 1 琼东南盆地东部天然气组分、干燥系数与碳同位素特征
Table 1. Natural gas composition, dry coefficient and carbon isotope characteristics, East Qiongdongnan basin
区带 井号 井段（m） 测试层号 天然气组分(%) 干燥系数 碳同位素δ13C(‰) C1 C2~5 N2 CO2 C1/C1~5 C1 C2 C3 C4 CO2 松东凹陷北坡带 SF24-1-1 2 122.5 MDT 74.30 9.80 6.77 7.81 0.88 -47.06 -30.92 -29.96 -28.64 -7.61 宝岛凹陷北坡带 BF13-1-1 1 573.0 ~1 580.0 DST 86.14 10.24 2.46 0.72 0.89 -48.65 -30.53 -31.15 -27.82 -25.54 BF13-3-1 1 740.0 MDT 84.70 11.40 2.80 0.61 0.88 -48.91 -27.45 -27.93 -27.84 BF13-3S-1 1 967.5 MDT 82.48 8.09 6.67 1.18 0.91 -45.53 -30.39 -29.84 -28.09 -29.33 BF19-2-3 3 911.0 MDT 79.70 8.29 6.28 1.19 0.91 -35.98 -30.39 -28.57 -27.41 -6.23 3 934.5 MDT 72.93 3.73 3.84 18.72 0.95 -35.17 -30.67 -28.60 -27.30 -4.26 松南低凸起 Y8-1-1 2 880.5 MDT 89.90 2.97 6.11 0.59 0.97 -45.44 -27.64 -27.80 -7.82 2 895.6 MDT 89.77 2.99 6.13 0.69 0.97 -45.59 -27.83 -27.88 -8.03 松涛凸起 SF34-3-1 2 301.8 MDT 93.92 4.50 0.43 0.65 0.95 -46.55 -27.57 -27.50 -16.70 2 311.6 MDT 92.70 5.42 0.39 0.72 0.94 -46.54 -25.59 -26.22 -16.22 注：SF24-1-1:下中新统三亚组; BF13-1-1:中中新统梅山组; BF13-3-1:中中新统梅山组; BF13-3S-1:中中新统梅山组; BF19-2-3:上渐新统陵水组Ⅰ气组和上渐新统陵水组Ⅱ气组; Y8-1-1:下渐新统崖城组; SF34-3-1:下中新统三亚组 
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表 2 琼东南盆地东区、北部湾盆地天然气轻烃C6和C7系列分析数据表
Table 2. The C6 and C7 light hydrocarbon series of the east Qiongdongnan Basin and the Beibu Gulf Basin
井名 井深(m) 采样方式 C6系列(%) C7系列(%) 正构烷烃 异构烷烃 环烷烃 芳香烃 正构烷烃 异构烷烃 环烷烃 芳香烃 SF24-1-1 2 122.5 FMT 21.72 41.95 34.08 2.25 15.52 31.90 49.14 3.45 BF13-1-1 1 573.0~1 580.0 DST 23.08 47.12 29.81 0 13.64 31.82 54.55 0 1 577.3 MDT 20.75 48.11 31.13 0 12.00 30.00 58.00 0 BF13-3-1 1 740.0 MDT 25.00 56.43 18.57 0 14.63 43.90 41.46 0 BF13-3S-1 1 967.5 MDT 21.19 41.53 36.44 0.85 13.21 26.42 58.49 1.89 BF19-2-3 3 911.0 MDT 15.15 36.36 39.39 9.09 16.67 33.33 33.33 16.67 3 934.5 MDT 9.09 18.18 27.27 45.45 6.25 6.25 31.25 56.25 Y8-1-1 2 880.5 MDT 12.82 46.15 30.77 10.26 11.43 31.43 48.57 8.57 2 895.6 MDT 13.33 44.44 28.89 13.33 12.50 32.50 45.00 10.00 L17-2-1 3 306.0 MDT 13.98 34.41 25.81 25.81 13.73 21.57 43.14 21.57 L18-1-1 2 819.9~2 846.7 DST 13.11 40.98 22.95 22.95 11.11 27.78 44.44 16.67 SF34-3-1 2 301.8 MDT 20.11 42.93 35.87 1.09 17.30 23.24 58.38 1.08 2 311.6 MDT 20.00 42.95 36.07 0.98 16.08 24.71 57.65 1.57 WZ1 2 137.5~2 265.8 DST3 29.53 42.13 27.95 0.39 19.63 23.36 56.07 0.93 WZ2 2 351.0~2 357.0 DST2 28.89 53.33 17.04 0.74 20.00 34.29 45.71 0 WZ3 2 459.0~2 473.5 DST2 28.85 48.72 18.59 3.85 20.45 31.82 43.18 4.55
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表 3 琼东南盆地主要含气构造天然气C7轻烃组成
Table 3. The Composition of C7 light hydrocarbon series of natural gas in Qiongdongnan basin
井名 深度(m) 地层 天然气C7轻烃组成 甲基环己烷指数(%) 成因类型 甲基环己烷(MCH)(%) 正庚烷（nC7）(%) 二甲基环戊烷(ΣDMCP)(%) SF24-1-1 2 122.5 下中新统三亚组 42.60 24.00 33.30 42.60 油型气 BF13-1-1 1 573.0~1 580.0 中中新统梅山组 40.00 20.00 40.00 40.00 油型气 1 577.3 40.00 17.10 42.90 40.00 油型气 BF13-3-1 1 740.0 中中新统梅山组 30.40 26.00 43.60 30.40 油型气 BF13-3S-1 1 967.5 下中新统三亚组 42.10 18.40 39.50 42.10 油型气 45.80 18.80 35.40 45.80 油型气 BF19-2-3 3 911.0 上渐新统陵水组二段Ⅰ气组 50.00 10.00 40.00 50.00 煤型气 3 934.5 上渐新统陵水组二段Ⅱ气组 50.00 16.70 33.30 50.00 煤型气 57.10 14.30 28.60 57.10 煤型气 60.00 20.00 20.00 60.00 煤型气 L17-2-1 3 306.0 上中新统黄流组 48.30 24.10 27.60 48.30 煤型气 L17-2-2 3 331.3 50.00 21.40 28.60 50.00 煤型气 L18-1-1 2 819.9~2 846.7 莺二段T29A气组 40.00 20.00 40.00 40.00 油型气 Y8-1-1 2 880.5 下渐新统崖城组 47.60 19.10 33.30 47.60 油型气 2 895.6 43.50 21.70 34.80 43.50 油型气 WZ1 2 137.5~2 265.8 流-段 33.30 25.90 40.70 33.30 油型气 WZ2 2 351.0~2 357.0 涠三段 34.80 30.40 34.80 34.80 油型气 WZ3 2 459.0~2 473.5 涠三段 35.71 32.14 32.14 35.71 油型气 注：甲基环己烷指数=MCH/(MCH+nC7+ΣDMCP)×100%
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表 4 Y8-1含气构造天然气混源比例计算表
Table 4. The calculation table of mixed source ratios of the natural gas in Y8-1 gas bearing structure
天然气组分 Y8-1气藏天然气碳同位素(‰) 湖相气端元：S24气藏 陆源浅海相气端元：L17气田 混源气藏天然气碳同位素(‰) 天然气组分含量m（%） 天然气碳同位素n (‰) 混合比例fh（%） 天然气组分含量x（%） 天然气碳同位素y (‰) 混合比例fq（%） 计算考虑天然气组分A 计算未考虑天然气组分B 乙烷 -27.74 4.45 -30.92 46.7 4.4 -24.93 53.3 -27.74 -27.73 丙烷 -28.84 3.36 -29.96 40.8 1.1 -23.38 59.2 -27.84 -26.06 注：丙烷同位素倒转偏轻，计算结果仅供参考，A=(m×n×fh+x×y×fq)/(m×fh+x×fq), B=n×fh+y×fq
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