A STUDY ON THE OIL AND GAS SOURCE OF TONGHUA BASIN, EAST PERIPHERAL BASIN OF SONGLIAO:NWE EVIDENCE FROM TONGDI WELL 1
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摘要: 通化盆地是发育在中生代基底之上的断陷盆地,勘探程度低,在该盆地三棵榆树凹陷钻探的通地1井发现油气显示,但油气来源尚不清楚,制约着盆地后续油气资源勘探部署工作。本文通过对通地1井原油和岩心烃源岩生物标志化合物的特征分析对比,发现通地1井原油与下白垩统下桦皮甸子组和亨通山组黑色泥质烃源岩具有类似的生物标志化合物分布特征,推测三棵榆树凹陷原油主要来自下白垩统下桦皮甸子组烃源岩,也可能来自亨通山组烃源岩,这一成果扩展了通化盆地及周缘油气勘探领域,为通化盆地下一步油气基础地质研究和勘探部署提供重要依据。Abstract: Tonghua basin is a faulted basin developed on the Mesozoic basement with a relatively low exploration degree. Oil and gas was found in Tongdi well 1 in the Sankeyushu sag of Tonghua basin, however, the source of the oil and gas is not clear, which restricts the exploration and development of oil and gas resources in Tonghua basin and its peripheral basins. Based on the comparative analysis on the features of the crude oil in Tongdi well 1 and the biomarker of the core hydrocarbon source rock, it is found that the biomarker distribution features are similar between the crude oil in Tongdi well 1 and black muddy hydrocarbon source rocks of the lower Cretaceous Xiahuapidianzi formation and Hengtongshan formation. It is drawn the conclusion that the crude oil in the Sankeyushu sag is basically from the hydrocarbon source rocks of low Cretaceous Xiahuapidianzi or Hengtongshan formation. This finding broaden the oil and gas exploration filed in Tonghua basin and its surrounding basins, which also provides a great basis for the further study of the basic geological research and exploration of oil and gas in Tonghua basin.
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Key words:
- Tonghua Basin /
- Tongdi well 1 /
- Geochemical features /
- Oil-sources correlation
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图 1 通化盆地构造单元分布图(据韩欣澎等[1]修改)
Figure 1. The tectonic unit distribution map of Tonghua basin(modified by reference No.1)
表 1 通化盆地中生界地层简表(据韩欣澎等[1]修改)
Table 1. Mesozoic strata sketch map of Tonghua Basin (modified by reference No.1)
地层时代 岩性 界 系 统 组 厚度(m) 中生界 白垩系 下统 黑崴子组 49.16 土黄色泥质中粗砂岩、紫色砂砾岩 亨通山组 373.94 暗色泥岩、泥页岩、粉砂质泥岩, 夹少量灰色沉凝灰岩 下桦皮甸子组 751.9 黑色泥岩、泥页岩、灰黑色粉砂质泥岩、少量灰色沉凝灰岩 林子头组 225 砂岩、沉凝灰岩、灰褐色玄武岩夹黑色页岩、粉砂质页岩 鹰嘴砬子组 150 泥页岩、沉凝灰岩 果松组 偏碱性中基性火山岩 侏罗系 中统 侯家屯组 砾岩、粉砂岩、凝灰质粉砂岩 表 2 通化盆地亨通山组和下桦皮甸子组烃源岩有机质地化参数表
Table 2. Geochemical parameters of Hengtongshan formation and Xiahuapidianzi formation in Tonghua Basin
层位 TOC(%) HC(×10-6) S1+S2(mg/g) 氯仿沥青"A"(%) Ro(%) 有机质类型 K1h 1.09(32) 2233.4(20) 2.53(32) 0.07(20) 1.054(16) Ⅰ-Ⅱ1型 0.49~3.49 12~10379 0.07~5.88 0.0038~0.1228 0.972~1.127 K1x 1.40(15) 2382.57(7) 2.37(15) 0.077(8) 1.133(13) Ⅰ型,局部Ⅱ型 0.67~3.6 4~9886 0.08~6.13 0.003~0.2109 0.986~1.399 表 3 通化盆地通地1井烃源岩和原油饱和烃色谱参数表
Table 3. The saturated hydrocarbon chromatogram parameters of hydrocarbon source rocks and crude oil in Tongdi well 1, Tonghua Basin
深度/m 层位 Ts/Tm CPI nC21-/nC22+ Pr/Ph Pr/nC17 Ph/nC18 洗油1 289.41~289.52 K1h 1.19 1.17 0.74 0.55 0.23 0.28 洗油2 327.46~327.52 K1h 1.14 1.07 0.95 0.74 0.16 0.15 洗油3 367.62~367.75 K1h 2.04 1.12 0.94 0.65 0.14 0.16 洗油4 387.88~388.18 K1h 1.20 1.18 1.01 0.52 0.24 0.28 洗油5 418.17~418.53 K1h 2.21 1.15 0.96 0.82 0.21 0.18 洗油6 423.15~423.29 K1h 1.22 1.17 0.69 0.63 0.28 0.27 烃源岩1 215.30~215.48 K1h 0.57 1.25 1.16 0.95 0.43 0.40 烃源岩2 220.87~221.02 K1h 0.56 1.19 1.04 0.93 0.42 0.39 烃源岩3 294.80~294.94 K1h 2.13 1.10 1.10 0.78 0.14 0.18 烃源岩4 312.34~312.43 K1h 1.17 1.10 0.75 0.65 0.19 0.27 烃源岩5 331.90~332.01 K1h 1.22 1.14 0.89 0.61 0.23 0.33 烃源岩6 426.84~426.91 K1x 1.11 1.18 0.88 0.76 0.19 0.23 烃源岩7 431.47~431.54 K1x 0.85 1.17 1.27 0.73 0.15 0.17 烃源岩8 587.24~587.36 K1x 0.95 1.06 1.18 0.58 0.30 0.51 表 4 通化盆地通地1井烃源岩和原油中甾萜烷参数表
Table 4. The parameters of the steroid and terpane in hydrocarbon source rocks and crude oil in Tongdi well 1 in Tonghua Basin
深度/m 层位 四环萜烷/三环萜烷 伽马蜡烷/C30藿烷 C35/(C31~C35)生藿烷指数 Ts/(Ts+Tm) C31生藿烷22S/(22S+22R) C27甾烷相对含量 C28甾烷相对含量 C29甾烷相对含量 C29甾烷20S/(20S+20R) C29甾烷ββ/(ββ+αα) 洗油1 289.41~289.52 K1h 0.041 0.24 0.06 0.56 0.57 0.33 0.25 0.43 0.39 0.36 洗油2 327.46~327.52 K1h 0.037 0.24 0.05 0.66 0.59 0.30 0.28 0.42 0.47 0.46 洗油3 367.62~367.75 K1h 0.033 0.12 0.05 0.67 0.59 0.34 0.24 0.41 0.46 0.42 洗油4 387.88~388.18 K1h 0.024 0.24 0.06 0.55 0.59 0.29 0.30 0.40 0.49 0.50 洗油5 418.17~418.53 K1h 0.031 0.12 0.06 0.69 0.60 0.32 0.28 0.40 0.49 0.43 洗油6 423.15~423.29 K1h 0.031 0.14 0.05 0.55 0.61 0.27 0.28 0.45 0.47 0.42 烃源岩1 215.30~215.48 K1h 0.057 0.23 0 0.36 0.56 0.22 0.29 0.49 0.29 0.26 烃源岩2 220.87~221.02 K1h 0.049 0.24 0 0.36 0.59 0.24 0.26 0.50 0.28 0.25 烃源岩3 294.80~294.94 K1h 0.032 0.35 0.08 0.68 0.56 0.34 0.25 0.41 0.48 0.50 烃源岩4 312.34~312.43 K1h 0.023 0.52 0.08 0.54 0.58 0.40 0.27 0.33 0.46 0.50 烃源岩5 331.90~332.01 K1h 0.032 0.33 0.08 0.55 0.60 0.30 0.31 0.39 0.47 0.48 烃源岩6 426.84~426.91 K1x 0.042 0.38 0.07 0.53 0.60 0.35 0.27 0.38 0.42 0.38 烃源岩7 431.47~431.54 K1x 0.040 0.22 0.06 0.46 0.59 0.24 0.33 0.43 0.45 0.41 烃源岩8 587.24~587.36 K1x 0.016 0.26 0 0.49 0.58 0.31 0.31 0.38 0.50 0.54 -
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