EVALUATION ON THE HYDROCARBON GENERATION POTENTIAL OF UPPER PERMIAN LINXI FORMATION IN WESTERN SLOPE OF SONGLIAO BASIN: Evidence from JBD-2 Well
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摘要:
对松辽盆地西部斜坡区中部吉白地2井上二叠统林西组的烃源岩发育特征及有机地球化学特征进行了系统研究.结果表明，该区上二叠统林西组暗色泥岩、板岩发育，单层最大厚度为29 m，累计厚度达138.42 m.有机碳含量为0.01%~2.10%，平均为0.62%，整体为中等烃源岩范畴，有机质丰度较高.应用干酪根碳同位素、干酪根元素法综合分析，判断其有机质类型以Ⅱ型干酪根为主，部分为Ⅲ型干酪根.镜质组反射率与伊利石结晶度分析表明烃源岩热演化达到高成熟-过成熟阶段，整体处于成岩作用阶段.综合评价认为该区上二叠统林西组具备一定的生烃潜力，且以生气为主，具有一定的页岩气资源前景.
Abstract:The paper studies the development and organic geochemical characteristics of source rocks from Upper Permian Linxi Formation in JBD-2 well in central western slope of Songliao Basin. The results show that dark mudstone and slate are developed with the maximum thickness of 29 m for single layer and cumulative thickness of 138.42 m. With high organic abundance, TOC of 0.01%-2.10% (averagely 0.62%), the formation generally belongs to medium grade source rock. Applying the carbon isotope and element composition of kerogen for comprehensive analysis, it is inferred that the organic type is Ⅱ-type kerogen dominated, with Ⅲ-type kerogen partly. The analyses of vitrinite reflectance(Ro) and illite crystallinity indicate the thermal evolution of source rocks reaches the high mature-over mature stage, and the whole is in the diagenesis stage. It is concluded from comprehensive evaluation that the Upper Permian Linxi Formation has certain hydrocarbon generation potential, mainly gas, and certain prospect for shale gas resource.
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Key words:
- hydrocarbon generation potential /
- source rock /
- Upper Permian /
- Linxi Formation /
- Songliao Basin
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表 1 松辽盆地西部斜坡区吉白地2井林西组烃源岩地球化学测试分析数据表
Table 1. Geochemical analysis data of Linxi Formation source rocks in JBD-2 well
深度/m 岩性 总有机碳TOC/% 氯仿沥青“A”/% 生烃潜量S1+S2/10-3 HI/10-3 最高峰温Tmax/℃ H/C O/C 干酪根碳同位素δ13C/‰ Ro /% 1879.65 黑色炭质泥岩 2.1 0.021894 0.32 19 434 / / -23.714 2.73 1881.85 黑色炭质泥岩 2.05 0.019483 0.14 7 447 0.13 0.01 -23.662 / 1896.88 黑色炭质泥岩 1.69 0.012338 0.04 2 442 0.13 0.02 -22.881 1.39 1897.95 黑色炭质泥岩 0.897 0.008147 0.12 6 300 0.43 0.08 -23.325 / 1917.7 灰黑色泥岩 0.0165 0.005303 0.07 13 436 / / -23.439 / 1919.91 灰黑色泥岩 0.0148 0.004545 0.16 31 326 / / -26.237 / 1921 灰黑色泥岩 0.041 0.005576 0.06 8 546 / / -28.632 3.14 1922 灰黑色泥岩 0.0104 0.004717 0.03 5 525 / / -26.038 / 1923 灰黑色泥岩 0.746 0.054696 0.15 12 433 0.44 0.12 -26.239 / 1924.04 灰黑色泥岩 1.1 0.007393 0.03 2 370 0.88 0.04 -26.006 3.63 1925.29 灰黑色泥岩 0.492 0.004762 0.12 10 351 0.58 0.09 -26.843 / 1926 灰黑色泥岩 0.802 0.003232 0.03 1 390 0.99 0.08 -26.465 3.02 1927 灰黑色泥岩 0.842 0.00547 0.06 3 440 0.79 0.14 -24.859 / 1928.2 灰黑色泥岩 0.861 0.002925 0.03 2 350 0.49 0.09 -24.631 3.35 1992.7 灰黑色板岩 0.0106 0.004215 0.09 7 408 / / -25.221 / 1993.7 灰黑色板岩 0.0251 0.003203 0.06 10 543 / / -25.257 2.87 1994.8 灰黑色板岩 0.0199 0.004915 0.06 8 450 1.02 0.12 -26.094 3.29 1995.5 灰黑色板岩 0.0118 0.007427 0.01 3 409 / / -27.914 2.27 1996.6 灰黑色板岩 0.0228 0.009011 0.02 2 373 1.27 0.21 -26.631 4.13 分析测试单位:长江大学油气资源与勘探技术教育部重点实验室. 
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表 2 吉白地2井林西组烃源岩TOC>1.0%厚度统计表
Table 2. Thickness data of Linxi Formation source rocks with TOC>1.0% in JBD-2 well
层数 岩性 顶深/m 底深/m 厚度/m TOC/% 1 黑色碳质泥岩 1879 1898 19 $ \frac{{1.69 \sim 2.10 * }}{{1.95}} $ 2 灰黑色泥岩 1913 1929.26 16.26 1.10 *横线上为测试值范围, 横线下为平均值; n=3.
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表 3 吉白地2井林西组烃源岩伊利石结晶度数据表
Table 3. Illite crystallinity data of Linxi Formation source rocks in JBD-2 well
深度/m 岩性 伊利石结晶度KIΔ2θ/° 1 923 黑色泥岩 0.55 1 925 黑色泥岩 0.84 1 926 黑色泥岩 0.26 1 928 黑色泥岩 0.50 1 995 黑色泥岩 0.53
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