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    冯伟明, 林家善, 李嵘, 赵瞻, 彭军, 余谦, 杨平, 曹竣锋, 翟昆, 刘伟, 叶定南. 上扬子垭紫罗裂陷槽北西段GWD2井下石炭统旧司组暗色页岩发育特征及其对生烃中心的约束[J]. 中国地质. DOI: 10.12029/gc20221228001
    引用本文: 冯伟明, 林家善, 李嵘, 赵瞻, 彭军, 余谦, 杨平, 曹竣锋, 翟昆, 刘伟, 叶定南. 上扬子垭紫罗裂陷槽北西段GWD2井下石炭统旧司组暗色页岩发育特征及其对生烃中心的约束[J]. 中国地质. DOI: 10.12029/gc20221228001
    FENG Weiming, LIN Jiashan, LI Rong, ZHAO Zhan, PENG jun, YU Qian, YANG Ping, CAO Junfeng, ZHAI Kun, LIU Wei, YE Dingnan. Development characteristics of Lower Carboniferous Jiusi Formation dark shale in well GWD-2 and it’s constraint to hydrocarbon generation center in the northwest of Yadu-Ziyun-Luodian aulacogen, the upper Yangtze Platform[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20221228001
    Citation: FENG Weiming, LIN Jiashan, LI Rong, ZHAO Zhan, PENG jun, YU Qian, YANG Ping, CAO Junfeng, ZHAI Kun, LIU Wei, YE Dingnan. Development characteristics of Lower Carboniferous Jiusi Formation dark shale in well GWD-2 and it’s constraint to hydrocarbon generation center in the northwest of Yadu-Ziyun-Luodian aulacogen, the upper Yangtze Platform[J]. GEOLOGY IN CHINA. DOI: 10.12029/gc20221228001

    上扬子垭紫罗裂陷槽北西段GWD2井下石炭统旧司组暗色页岩发育特征及其对生烃中心的约束

    Development characteristics of Lower Carboniferous Jiusi Formation dark shale in well GWD-2 and it’s constraint to hydrocarbon generation center in the northwest of Yadu-Ziyun-Luodian aulacogen, the upper Yangtze Platform

    • 摘要:研究目的】上扬子垭紫罗裂陷槽内广泛分布下石炭统旧司组暗色泥页岩,其厚度变化大,该裂陷槽北西段旧司组暗色泥页岩发育特征和生烃中心展布并不清楚。【研究方法】通过对GWD2井旧司组的测录井以及岩芯观察、岩石薄片鉴定、干酪根类型显微鉴定、有机碳含量、镜质体反射率测定等资料的综合分析,对旧司组的地层-沉积相、暗色泥页岩分布和有机地化特征进行了详细研究。【研究结果】 ①该井下石炭统旧司组地层厚度大,钻厚1148.67m,按照岩石组合特征可细分为2个段以及5个亚段; ②泥页岩主要分布在旧一段,以三角洲-浅水陆棚相沉积为主,泥页岩累积厚度525m,TOC≥1%泥页岩累积厚度大,可达425m; ③该井旧司组暗色泥页岩TOC值集中在1%~2%区间内,有机质类型为Ⅱ 2型和Ⅲ型干酪根,有机质处于过成熟早期阶段; ④旧司组沉降中心呈NW-SE向长条状展布,生烃中心与沉降中心分布一致,TOC≥ 1%的泥质岩烃源岩厚度可达300m以上,生烃中心具有泥质烃源岩厚度巨大、有机质类型较好、热演化程度较高的生烃条件。【结论】垭紫罗裂陷槽北西段生烃中心下石炭统旧司组泥页岩的生烃强度和总生烃量相当可观,且具有较好的天然气勘探潜力。

       

      Abstract: This paper is the result of Shale gas geological survey engineering. Objective Dark shales in Lower Carboniferous upper are widely distributed in the Yadu-Ziyun-Luodian aulacogen, the upper Yangtze Platform, and its thickness varies greatly. In particular, the development characteristics and hydrocarbon generation center distribution of the dark shale of the Jiusi Fr in the northwest section of the rift aulacogen are not clear. Methods The strata, sedimentary facies, dark shale distribution and organic geochemical characteristics of Jiusi dark shale in well GWD-2 are studied in detail by the logging, core observation, rock thin-section identification, kerogen type microscopic identification, TOC, vitrinite reflectance measurement and other experimental test data. And the following research results were obtained. Results First, the drilling thickness of Jiusi Fr in the well GWD-2 is 1148.67m, according to the characteristics of rock combinations, the Lower Carboniferous Jiusi Fr can be divided into two members and five sub members, Second, the dark shales are mainly distributed in the first member of Jiusi Fr, which are mainly composed of tidal flat by delta and shallow shelf facies deposits, the cumulative thickness of shale is 525m, the cumulative thickness of shale with TOC value greater than 1% is 425m. Third, The TOC value of Jiusi shale of the well is concentrated in the range of 1%~2%, the type of organic matter is mainly type II2 kerogen and III kerogen, the organic matters are in the early stage of over maturity. The last, it is predicted that the subsidence center of Jiusi Fr is distributed in a long strip with NW-SE direction, and the distribution of hydrocarbon generation center is consistent with the subsidence center. The thickness of argillaceous source rock with TOC value greater than 1% can reach more than 300m. The hydrocarbon generation center has the hydrocarbon generation conditions of argillaceous source rock with huge thickness, good organic matter type and high degree of thermal evolution. Conclusions It is concluded that the shale of Lower Carboniferous Jiusi Fr in the hydrocarbon generation center of the northwest section of Yadu-Ziyun-Luodian aulacogen has considerable hydrocarbon generation intensity and total hydrocarbon generation, and has good natural gas exploration potential.

       

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