石刚, 徐振宇, 郑红军, 殷启春, 滕龙, 周道容, 方朝刚, 邵威, 王佳龙, 黄正清. 下扬子地区“三气一油”钻探发现及成藏地质条件——以皖南港地1井钻探发现为例[J]. 地质通报, 2019, 38(9): 1564-1570.
    引用本文: 石刚, 徐振宇, 郑红军, 殷启春, 滕龙, 周道容, 方朝刚, 邵威, 王佳龙, 黄正清. 下扬子地区“三气一油”钻探发现及成藏地质条件——以皖南港地1井钻探发现为例[J]. 地质通报, 2019, 38(9): 1564-1570.
    SHI Gang, XU Zhenyu, ZHENG Hongjun, YIN Qichun, TENG Long, ZHOU Daorong, FANG Chaogang, SHAO Wei, WANG Jialong, HUANG Zhengqing. "Three-Gas-One-Oil" drilling findings and reservoir formation geological conditions in the lower Yangtze area: Exemplified by Gang Di 1 well in South Anhui[J]. Geological Bulletin of China, 2019, 38(9): 1564-1570.
    Citation: SHI Gang, XU Zhenyu, ZHENG Hongjun, YIN Qichun, TENG Long, ZHOU Daorong, FANG Chaogang, SHAO Wei, WANG Jialong, HUANG Zhengqing. "Three-Gas-One-Oil" drilling findings and reservoir formation geological conditions in the lower Yangtze area: Exemplified by Gang Di 1 well in South Anhui[J]. Geological Bulletin of China, 2019, 38(9): 1564-1570.

    下扬子地区“三气一油”钻探发现及成藏地质条件——以皖南港地1井钻探发现为例

    "Three-Gas-One-Oil" drilling findings and reservoir formation geological conditions in the lower Yangtze area: Exemplified by Gang Di 1 well in South Anhui

    • 摘要: 下扬子地区经历了多期构造运动,地质条件复杂,对油气保存条件产生了重要影响。页岩油气具有自生自储的特性,与常规油气相比,对保存条件的要求较低,在下扬子地区具备形成页岩油气藏的潜力。通过港地1井钻探,在下扬子地区二叠系大隆组和龙潭组获得了页岩油、页岩气、煤层气和致密砂岩气“三气一油”的发现,与常规油气“上气下油”不同,港地1井油气呈现“上油下气”式非常规油气储集方式。大隆组富有机质页岩厚度约70m,地层倾角10°~20°,现场解吸获取的页岩气样品甲烷含量达80%,有机质丰度为1.9%~2.3%,平均值约2.0%,有机质成熟度(Ro)为1%~1.25%,平均值约1.2%,具备生成页岩油气的良好基础。基于港地1井的钻探发现,认为下扬子地区构造运动影响弱、盆地规模小、保存条件好的“小而整”的坳陷或盆地具备形成页岩油气藏的地质条件。

       

      Abstract: In the lower Yangtze region, the tectonic movement is complicated and the geological conditions are complex, which has a great impact on the conditions of oil and gas accumulation and preservation. The shale has the characteristics of generating gas and storing gas. The requirements for preservation conditions are relatively lower than those for conventional oil and gas, which makes it possible to form a large oil and gas reservoir in lower Yangtze region. Through drilling the Gang Di 1 well, the authors revealed "Three-Gas-One-Oil" feature that includes shale oil, shale gas, coalbed gas and tight sandstone gas in Permian Dalong Formation and Longtan Formation in lower Yangtze region. It is different from conventional oil and gas storage in which gas is in the upper part and oil is in the lower part; therefore, the feature revealed by the authors is an unconventional oil and gas reservoir mode. It is observed that organic shale thickness is about 70m, and formation dip is about 10° ~25° in the core of GD1. The in situ desorption data show that methane content is about 80%. Experimental data show TOC is 1.9%~2.3%, about 2.0% on average; Ro is about 1%~1.25%, about 1.2% on average in the core of GD1. Based on GD 1 drilling discovery, the authors hold that the "small and whole" depression or basin has the geological conditions for forming shale oil and gas reservoirs with weak tectonic movement, small basin and good preservation conditions in the lower Yangtze region.

       

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