Oil and source correlation and its geological significance of Fengcheng 1 well block in Wuxia fault zone, Junggar Basin
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摘要: 随着准噶尔盆地西部隆起乌夏断裂带常规油气勘探进入后期,近两年来该区下二叠统风城组页岩油勘探取得重大突破。在不断深化研究风城组常规油藏和页岩油藏富集规律的过程中,发现以前对风城1井区油源认识存在不妥之处,之前勘探工作者们认为该井区原油均来自风城组烃源岩。为此,对该区现有探井二叠系烃源岩及原油的各类有机地球化学分析数据开展了系统分析整理,应用油气源对比地球化学理论和石油地质理论,主要利用烃源岩与原油的色谱、色谱—质谱和碳同位素数据,再结合单井模拟烃源岩热演化史结果,重新对比该井区各个出油层系的油源。研究结果发现,下二叠统佳木河组下部灰黑色、黑色泥岩段厚约95 m,沉积环境和母质类型与风城组相似,但前者母质类型相对偏向腐殖型,有机质丰度普遍较高,为一套高成熟偏腐泥型好—优质烃源岩。风城1井风城组一段上部成熟原油源于风城组烃源岩,下部两个油层和风城011井佳木河组油层的高熟原油主要来自佳木河组烃源岩,其次混有少量来自风城组烃源岩的烃类,而非只源于风城组。推测佳木河组烃源岩在空间上有较大分布范围,可为乌夏断裂带常规油气成藏提供一定量的油气资源,故该区应加强佳木河组烃源岩厚度展布研究,从而为寻找新的油气勘探领域提供依据。Abstract: As the conventional oil and gas exploration in the Wuxia fault zone of the western uplift of the Junggar Basin enters its later stages, great breakthroughs have been made in shale oil exploration of the Lower Permian Fengcheng Formation in the past two years. In the process of exploring the accumulation patterns of conventional and shale oil reservoirs in the Fengcheng Formation, it was found that previous understanding of the oil sources in Fengcheng 1 well block was inaccurate. Earlier researchers believed that crude oil in this well block was solely derived from the source rocks of the Fengcheng Formation. To reevaluate this understanding, various organic geochemical data from Permian source rocks and crude oil in existing exploration wells of this area were systematically analyzed. By applying the geochemical oil and source correlation theory and petroleum geology theory, and using chromatography, chromatography-mass spectrometry, and carbon isotope data from source rocks and crude oil, the study reexamined the oil sources in various oil-producing formations in the well block, combined with single-well simulations of source rock thermal evolution history. The results showed that the lower gray-black and black mudstone section of the Lower Permian Jiamuhe Formation, with a thickness of approximately 95 m, had a sedimentary environment and parent material type similar to those of the Fengcheng Formation. However, the parent material type in the Jiamuhe Formation was relatively more humic, with higher organic matter abundance, making it a highly mature humic type, good to high-quality source rocks. The mature crude oil in the upper part of the first member of the Fengcheng Formation in Fengcheng 1 well originated from the source rocks of the Fengcheng Formation. The highly mature crude oil in the two lower oil layers and the Jiamuhe Formation oil layer in Fengcheng 011 well mainly sourced from the source rocks of the Jiamuhe Formation, with a small contribution from the source rocks of the Fengcheng Formation, rather than exclusively from the source rocks of the Fengcheng Formation. It is speculated that the source rocks of the Jiamuhe Formation have a wide spatial distribution range and can provide substantial oil and gas resources for conventional oil and gas accumulation in the Wuxia fault zone. Therefore, it is recommended to strengthen the research on the thickness distribution of source rocks of the Jiamuhe Formation in this area, providing a basis for identifying new oil and gas exploration fields.
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表 1 准噶尔盆地乌夏断裂带风城1井区探井及邻井试油成果与原油物性对比
Table 1. Comparison of oil testing results and crude oil properties between exploration wells and adjacent wells in Fengcheng 1 well block, Wuxia fault zone, Junggar Basin
井号 层位 顶深/m 底深/m 日产油/t 日产气/104 m3 气油比 原油密度/(g/cm3) 原油黏度(50 ℃)/(mPa·s) 含蜡量/% 凝固点/℃ 风城1 P1f3 3 119 3 134 0.07 0 0 0.92 1 229.98 3.76 9 风城1 P1f1 3 960 3 976 8.96 0.073 81 0.90 261.67 3.73 -10 风城1 P1f1 4 194 4 272 109.80 3.320 302 0.83 3.71 3.45 -16 风城1 P1f1 4 307 4 319 12.40 0.237 191 0.85 7.56 3.13 -10 风城011 P1f1 3 852 3 864 28.35 0.631 223 0.90 69.92 3.69 -14 风城011 P1j 4 095 4 108 1.39 0 0 0.85 8.47 3.91 -6 玛页1 P1f1 4 877 4 937 16.03 0 0 0.88 24.11 4.75 -4 玛页2 P1f3 3 861 3 904 8.45 0 0 0.91 229.28 5.65 -12 玛页2 P1f1 4 659 4 912 17.29 0 0 0.84 6.26 3.72 -2 风南14 P1f1 4 391 4 458 10.14 0.077 76 0.90 59.74 3.26 -24 风南409 P1f3 4 475 4 522 10.04 0 0 0.92 326.31 6.33 -4 玛54X P1f2 4 488 4 800 47.69 0.236 49 0.92 312.48 4.47 -12 夏203 P1f2 4 773 4 796 2.98 0 0 0.89 40.79 5.74 -8 表 2 准噶尔盆地乌夏断裂带风城1井区探井与邻井原油链烷烃参数对比
Table 2. Comparison of crude oil alkane parameters between exploration wells and adjacent wells in Fengcheng 1 well block, Wuxia fault zone, Junggar Basin
井号 层位 顶深/m 底深/m 主峰碳 Pr/Ph Pr/nC17 Ph/nC18 ΣnC21-/ ΣnC22+ ΣnC21+nC22/ ΣnC28+nC29 CPI γ/β-胡萝卜烷 β-胡萝卜烷相对含量 风城1 P1f3 3 119 3 134 iC19 1.01 1.43 1.96 0.75 1.76 1.15 0.17 2.08 风城1 P1f1 3 960 3 976 iC20 0.76 1.48 2.26 1.24 2.08 1.12 0.21 0.85 风城1 P1f1 4 194 4 272 iC20 0.97 1.41 1.78 2.17 2.43 1.05 0.33 0.76 风城1 P1f1 4 307 4 319 iC20 0.93 1.42 1.94 1.90 2.39 1.03 0.30 0.67 风城011 P1f1 3 852 3 864 iC20 0.78 1.52 2.34 1.09 1.95 1.08 0.15 0.83 风城011 P1j 4 095 4 108 iC20 0.82 1.38 1.48 1.69 2.46 1.04 0.79 0.50 玛页1 P1f2-3 4 579 4 852 iC20 0.78 1.14 1.02 1.35 1.81 0.24 0.51 玛页1 P1f1 4 877 4 937 iC20 0.69 1.34 2.17 0.91 1.31 0.97 0.20 1.42 玛页2 P1f1 3 861 3 904 iC19 1.06 1.07 1.47 1.30 1.67 1.10 0.16 1.17 玛页2 P1f3 4 659 4 912 iC20 0.74 1.10 1.82 2.39 2.01 1.05 0.23 0.72 风南14 P1f1 4 391 4 458 iC20 0.88 1.50 1.96 1.70 2.06 1.12 0.18 0.82 玛54X P1f2 4 488 4 800 iC20 0.82 1.17 1.48 1.49 1.75 1.09 0.29 0.54 表 3 准噶尔盆地乌夏断裂带风城1井区探井原油成熟度参数
Table 3. Maturity parameters of crude oil from exploration wells in Fengcheng 1 well block, Wuxia fault zone, Junggar Basin
井号 层位 顶深/m 底深/m 原油密度/ (g/cm3) ΣnC21-/ ΣnC22+ ΣnC21+nC22/ ΣnC28+nC29 CPI 三环/五环萜烷 C29甾烷20S/ (20S+20R) αββ/ΣC29甾烷 原油成熟度 风城1 P1f3 3 119 3 134 0.918 3 0.75 1.76 1.15 0.33 0.31 0.31 低成熟 风城1 P1f1 3 960 3 976 0.902 1 1.24 2.08 1.12 0.78 0.46 0.45 成熟 风城1 P1f1 4 194 4 272 0.826 8 2.17 2.43 1.05 2.56 0.47 0.60 高成熟 风城1 P1f1 4 307 4 319 0.847 3 1.90 2.39 1.03 1.92 0.47 0.60 高成熟 风城011 P1f1 3 852 3 864 0.897 5 1.09 1.95 1.08 0.74 0.43 0.37 成熟 风城011 P1j 4 095 4 108 0.850 7 1.69 2.46 1.04 2.18 0.47 0.55 高成熟 -
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