Geochemical Characteristics and Oil Source Correlation of Paleo-Reservoirs in Biluocuo Area, Qiangtang Basin
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摘要: 羌塘盆地是一个大型中生代海相沉积盆地,盆地内发育多套烃源岩,并发现多处古油藏和油气显示,确定古油藏油源对油气勘探至关重要.为明确古油藏油源,对古油藏和烃源岩样品进行地球化学分析.研究表明古油藏可分为2类:Ⅰ类古油藏整体处于成熟-高成熟阶段,C24四环萜烷丰度较高,三环萜烷丰度低,C29规则甾烷占有一定优势,C29藿烷含量较高,体现出以陆源有机质贡献为主的特征.Ⅱ类古油藏整体处于低成熟-成熟阶段,以C23三环萜烷为主峰,低丰度C24四环萜烷,C27规则甾烷占优势,表明母质来源以低等水生生物为主.油源对比表明,两类古油藏来源于不同的烃源岩,Ⅰ类油藏来自于上三叠统扎那组烃源岩,Ⅱ类油藏主要为下侏罗统曲色组烃源岩的贡献.Abstract: Qiangtang basin is a large Mesozoic marine sedimentary basin, in which several sets of source rocks are developed, and many paleo-reservoirs and hydrocarbon indications are discovered. Determining the oil source of paleo-reservoirs is very important for oil and gas exploration. In order to clarify the oil source of the paleo-reservoir, geochemical analysis of oil and source rock samples is carried out in this paper. The results show that the paleo-reservoirs can be divided into two types: type Ⅰ paleo-reservoirs are in the mature-high mature stage in general with the high content of C24 tetracyclic terpane, the low tricyclic terpane abundance, C29 regular sterane with certain advantages in content, and high C29 hopane content, reflecting the contribution of terrigenous organic matter. Type Ⅱ paleo-reservoir is in the low mature-mature stage in general, with C23 tricyclic terpane as the main peak, low content of C24 tetracyclic terpane and the domination of C27 regular sterane, indicating the precursor was mainly lower aquatic organisms. The oil-source correlation result shows that the two types of paleo-reservoirs come from different source rocks. Type Ⅰ crude oil comes from the source rocks of Zhana Formation of Upper Triassic, and type Ⅱ crude oil is mainly contributed by the source rocks of Quse Formation of Lower Jurassic.
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Key words:
- Qiangtang basin /
- paleo-reservoir /
- source rock /
- biomarker /
- oil-source correlation /
- petroleum geology
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表 1 羌塘盆地烃源岩等级划分标准(据赵政璋等,2001修改)
Table 1. Classification standard of source rocks in Qiangtang basin (according to Zhao et al., 2001)
级别 碳酸盐岩烃源岩 总有机碳 氯仿沥青A 总烃 S1+S2 (%) (%) (10-6) (mg/g) 非烃源岩 < 0.10 < 0.03 < 100 < 1 较差烃源岩 0.10~0.3 0.03~0.05 100~200 1~2 中等烃源岩 0.3~0.7 0.05~0.10 200~500 2~5 好烃源岩 0.7~1.4 0.10~0.20 500~1 000 5~10 很好烃源岩 > 1.4 > 0.20 > 1 000 > 10 表 2 羌塘盆地毕洛错地区油藏链烷烃参数
Table 2. Parameters of alkanes in Biluocuo reservoir of Qiangtang basin
地区 样品编号 地层 CPI OEP ∑nC21-/ ∑nC22+ Pr/Ph Pr/C17 Ph/C18 德如日 DT-0065 S1 布曲组 1.36 0.90 1.25 0.39 0.71 1.25 DT-0065 S2 布曲组 1.10 0.99 0.89 0.59 0.69 1.05 DT-0125 S 布曲组 1.50 0.80 1.31 0.37 0.66 0.97 索日卡 DT-0109 S1 布曲组 1.05 0.99 0.37 0.43 0.90 0.47 DT-0109 S2 布曲组 1.01 1.01 0.72 0.50 0.46 0.69 DT-0109 S3 布曲组 1.19 1.01 0.63 0.47 0.50 0.79 DT-0223 S 布曲组 1.02 0.99 0.50 0.41 0.45 0.59 DT-0230 S 布曲组 1.01 0.91 0.44 0.38 0.85 1.18 DT-0270 S 布曲组 1.19 1.13 0.19 0.49 1.54 0.57 DT-0274 S 布曲组 1.08 0.97 0.66 0.47 0.51 0.83 桑嘎尔塘布 DT-0235 S 布曲组 1.11 0.85 0.66 0.41 1.15 1.57 DT-0257 S 布曲组 1.19 1.22 0.22 0.51 0.73 1.46 DT-0281 S 布曲组 1.15 1.07 0.18 0.43 0.94 0.65 AD17309 S 布曲组 0.93 0.95 0.10 0.78 1.93 1.86 AD17311 S1 布曲组 1.42 1.53 0.21 0.34 0.27 0.55 AD17312 S4 布曲组 1.12 1.25 0.69 0.61 0.18 0.35 PMSG02-2 S 布曲组 1.13 1.10 0.11 0.18 0.39 0.93 巴格底加日 AD17270-1S 布曲组 1.15 1.07 0.34 0.38 0.30 0.38 PMBG05-2S 布曲组 1.08 1.04 0.49 0.29 0.12 0.24 牙夏赛 PMYX10-1S 布曲组 1.00 1.17 0.46 0.41 0.27 0.42 表 3 羌塘盆地毕洛错地区油藏生标参数
Table 3. Parameters of reservoir biomarkers in Biluocuo area, Qiangtang basin
地区 样品编号 C21TT/ C23TT C24TeT/ C26TT Ga/ C30H Ts/ Tm C29-αββ/(αββ+ααα) C2920S/ (20S+20R) 德如日 DT-0065 S1 0.62 0.49 0.27 0.80 0.43 0.46 DT-0065 S2 0.77 0.56 0.21 0.61 0.38 0.43 DT-0125 S 0.61 0.51 0.32 0.71 0.42 0.46 索日卡 DT-0109 S1 0.43 5.19 0.11 1.20 0.43 0.39 DT-0109 S2 0.70 1.88 0.19 1.95 0.40 0.44 DT-0109 S3 0.59 2.36 0.15 1.07 0.39 0.42 DT-0223 S 0.80 2.07 0.27 3.38 0.39 0.43 DT-0230 S 0.61 1.25 0.14 0.50 0.41 0.45 DT-0270 S 0.47 1.34 0.17 1.57 0.42 0.43 DT-0274 S 0.51 1.69 0.14 1.26 0.29 0.26 桑嘎尔塘布 DT-0235 S 0.71 0.53 0.30 1.04 0.41 0.45 DT-0257 S 0.42 0.44 0.28 0.81 0.40 0.42 DT-0281 S 0.74 0.71 0.29 1.35 0.43 0.47 AD17309 S 0.31 0.51 0.19 0.95 0.43 0.45 AD17311 S1 0.49 0.54 0.15 0.96 0.41 0.43 AD17312 S4 0.46 0.64 0.17 1.12 0.47 0.50 PMSG02-2 S 0.25 0.49 0.21 0.89 0.43 0.47 巴格底加日 AD17270-1S 0.46 0.60 0.12 0.74 0.47 0.23 PMBG05-2S 0.43 0.80 0.21 1.22 0.45 0.49 牙夏赛 PMYX10-1S 0.50 3.87 0.09 0.33 0.41 0.36 表 4 羌塘盆地毕洛错地区烃源岩有机质丰度统计表
Table 4. Statistic of organic matter abundance of source rocks in Biluocuo area of Qiangtang basin
地层 总有机碳 产油潜率 氯仿沥青A 总烃 硫含量 评价 (%) S1+S2(mg/g) (%) (10-6) (%) 扎那组 0.80~24.60 0.94~26.18 0.010~0.544 452~1 732 0.03~0.16 中等—好 10.21 10.68 0.249 1 219 0.11 曲色组 0.28~9.07 0.06~78.99 0.002~1.407 24~3 545 0.10~0.68 差—优质 4.59 28.46 0.363 1 534 0.39 注:$\frac{{0.28 - 9.07}}{{4.59}}$表示$\frac{{最小值 - 最大值}}{平均值}$. 表 5 羌塘盆地毕洛错地区烃源岩生标参数
Table 5. Biomarker parameters of source rocks in Biluocuo area, Qiangtang basin
样品编号 地层 Pr/Ph C21TT/C23TT C24TeT/C26TT Ga/C30H DT-0019 S 曲色组 0.63 0.07 0.51 0.23 DT-0021 S1 曲色组 0.70 0.10 0.61 0.23 DT-0021 S2 曲色组 0.64 0.12 0.49 0.27 DT-0022 S 曲色组 0.74 0.20 0.50 0.05 DT-0023 S1 曲色组 0.60 0.25 0.79 0.12 DT-0023 S2 曲色组 0.61 0.21 0.65 0.12 DT-0026 S1 曲色组 0.69 0.34 1.01 0.06 DT-0026 S2 曲色组 0.58 0.27 0.59 0.11 DT-0136 S1 曲色组 0.69 0.17 0.51 0.30 DT-0136 S2 曲色组 0.65 0.18 0.53 0.28 BL-01 曲色组 0.49 0.19 0.54 0.12 BL-02 曲色组 0.54 0.17 0.49 0.13 BL-03 曲色组 0.38 0.18 0.54 0.10 BL-04 曲色组 0.48 0.19 0.54 0.12 BL-05 曲色组 0.48 0.19 0.55 0.12 AD17303 S 曲色组 0.37 0.18 0.52 0.12 AD17389 S 曲色组 0.48 0.14 0.47 0.26 AD17020 S1 扎那组 2.96 1.56 3.00 0.04 AD17020 S2 扎那组 2.26 2.54 4.70 0.03 AD17021 S1 扎那组 8.57 1.27 1.44 0.13 -
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