Molecular geochemical characteristics and hydrocarbon genesis of source rocks in Well LW21-A in ultra-deep water area of Pearl River Mouth Basin
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摘要:
珠江口盆地超深水区勘探程度低，珠四坳陷仅LW21-A井有油气发现，通过对其进行系统地特征分子地球化学测试与分析，揭示了所钻遇烃源岩的类型和发现油气的成因。该钻井揭示，文昌组和恩平组发育海相（海侵）泥岩和微咸水浅湖相（近海湖盆）泥岩；LW21构造气藏中存在海相（海侵）和湖相2类凝析油；LW21构造气藏中天然气主要成分为CO2，属于CO2气藏，含一定量烷烃气；CO2主要是无机幔源型成因气，烷烃气主要是油型气与海相生物气的混合型干气。这一认识对珠江口盆地超深水区珠四坳陷带的进一步评价和勘探决策具有重要意义。
Abstract:The ultra-deep water area of the Pearl River Mouth Basin remains poorly explored, from which only LW21-A well in the Zhusi Depression has oil and gas discovered. Through systematic molecular geochemical testing and analysis, the types of hydrocarbon source rocks encountered were specified and the genesis of oil and gas discovered were revealed. Result shows that the Wenchang Formation and Enping Formation of the well developed marine (transgression) mudstone and brackish shallow lake (offshore lake basin) mudstone. There are two types of condensate in LW21 structural gas reservoir: marine (transgressive) and lacustrine. The main component of natural gas in LW21 structural gas reservoir is CO2, which belongs to CO2 gas reservoir and contains a certain amount of alkane gas. CO2 is mainly inorganic mantle-derived genetic gas, alkane gas is mixed dry gas, mainly the mixture of oil-type gas and marine biogenic gas. This understanding is of great significance to the further evaluation and exploration decision of the Zhusi Depression zone in the ultra-deep water area of the Pearl River Mouth basin.
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表 1 LW21-A井泥岩样品CPI和BIT数据统计
Table 1. The CPI and BIT data of mudstone samples from Well LW21-A
层位 深度/m CPI BIT 恩平组 3 643～3 646 1.15 0.33 3 673～3 676 1.21 0.23 3 685～3 688 1.08 0.31 3 712～3 715 1.09 0.34 3 718～3 721 1.02 0.29 文昌组 3 790～3 793 1.06 0.32 3 808～3 811 1.16 0.29 3 838～3 841 1.08 0.34 3 853～3 856 1.05 0.29 3 868～3 871 0.98 0.14 3 898～3 901 1.05 0.22 3 910～3 913 1.02 0.24 3 934～3 937 1.11 0.07 3 964～3 967 1.02 0.29 4 006～4 009 1.00 0.28 
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表 2 LW21-A井PVT样品天然气组成特征
Table 2. Natural gas compositions of the PVT samples from Well LW21-A
样品编号 气体含量/（%V/V） C1-7/（%V/V） 干燥系数/% 甲烷 乙烷 乙烯 丙烷 丙烯 iC4 nC4 丁烯 iC5 nC5 C6 C7 H2 CO2 H2S O2 N2 CO BAG-3189m 30.9 0.58 - 0.24 - 0.034 0.036 - 0.01 0.005 - - 0.53 59.36 - - 8.4 - 31.81 97.15 BAG-3321m 2.82 0.06 - 0.03 - 0.004 0.003 - 0.001 - - - 0.01 92.41 - - 4.68 - 2.92 96.64 SC-3184.9m 35.04 0.68 - 0.28 - 0.042 0.043 - 0.012 0.004 - - 0.01 62.16 - - 1.73 - 36.1 97.06 SC-3321.2m 12.29 0.07 - 0.01 - 0.001 0.001 - - - - - 0.01 87.61 - - - - 12.37 99.34 SC-3370.1m 5.74 0.06 - 0.01 - 0.002 0.001 - - - - - 0.14 91.77 - - 2.27 - 5.81 98.74 注：“-”为无数据。
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