The formation environment and developmental models of argillaceous dolomite in the Xingouzui Formation, the Jianghan Basin
The formation environment and developmental models of argillaceous dolomite in the Xingouzui Formation, the Jianghan Basin
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江汉盆地新沟嘴组泥质白云岩形成环境及发育模式
DOI：
10.1016/j.marpetgeo.2015.06.011
复制
发表时间：
2015-11
影响因子：
4.2
通讯作者：
Shiqiang Wu
中科院分区：
文献类型：
--
作者：
Wenhao Li;Shuangfang Lu;Haitao Xue;Pengfei Zhang;Shiqiang Wu
江汉盆地新沟嘴组泥质白云岩中发现页岩油资源，为油气勘探开辟了新的领域。研究泥质白云岩形成的环境，揭示了盆地页岩油形成和分布的细节。通过对石油勘探基础地质资料的详细分析，结合有机岩石学和地球化学方法，探讨了雅角—新沟隆起和陈沱口凹陷泥质白云岩的形成环境和发育模式。结果表明：雅角—新沟隆起和陈郭口凹陷泥质白云岩TOC平均值超过1.0%，达到较好的烃源岩标准；陈托口凹陷泥质白云岩有机质类型明显优于雅角—新沟隆起。烃源岩有机质成熟度较低。在陈托口凹陷泥质白云岩中发现了来自藻类的三环萜烷、孕烷和均孕烷，而在雅角—新沟隆起未发现这些化合物。此外，在上述两个区域分别检测到褐藻质和孢子质。因此，陈沱口凹陷的湖泊生产力相对于雅角—新沟隆起较高。Pr/Ph、Fe2+/Fe3+、伽马蜡烷/ c30藿烷数据显示泥质白云岩发育于缺氧环境，水体分层较好。缺氧环境是控制泥质白云岩形成的主要因素。陈托口凹陷中央带是湖泊生产力较高、有机质保存条件较好的地区，是形成易生油的泥质白云岩的最有利地带。
Shale oil resources are found in the argillaceous dolomite in the Xingouzui Formation of the Jianghan Basin, revealing a new field for petroleum exploration. Studying the environment in which argillaceous dolomite forms reveals details regarding the formation and distribution of shale oil in the basin. By combining a detailed analysis of the basic geological data from petroleum exploration with methods based on organic petrology and geochemistry, the formation environment and developmental models of argillaceous dolomite in the Yajiao–Xingou Uplift and Chentuokou Sag are discussed. The results are as follows: the average TOC values in the argillaceous dolomite exceed 1.0% in the Yajiao–Xingou Uplift and Chentuokou Sag, reaching better source rock standards. The type of organic matter of the argillaceous dolomite from the Chentuokou Sag is obviously better than that in the Yajiao–Xingou Uplift. The maturity of organic matter in the source rocks is lower. Tricyclic terpanes, pregnane and homopregnane, which originated from algae, are detected in the argillaceous dolomite in the Chentuokou Sag, while these compounds are not found in Yajiao–Xingou Uplift. In addition, the alginite and sporinite are respectively detected in the two areas described above. Therefore, the lake productivity is higher in the Chentuokou Sag relative to the Yajiao–Xingou Uplift. The Pr/Ph, Fe2+/Fe3+and gammacerane/C30hopane data reveal that argillaceous dolomite developed in an anoxic environment with better water column stratification. The anoxic environment is the major factor controlling the formation of argillaceous dolomite. The central belt of the Chentuokou Sag was where the lake productivity was higher and preservation conditions of organic matter were excellent, making it the most favorable zone for forming argillaceous dolomite that tends to generate oil.
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DOI：
--
发表时间：
2015
期刊：
Journal of Palaeogeography
影响因子：
--
作者：
Mlr Key
通讯作者：
Mlr Key
影响因子：
1.8
作者：
Bian Rui-kang
通讯作者：
Bian Rui-kang
影响因子：
3.5
作者：
G. Demaison;G. T. Moore
通讯作者：
G. Demaison;G. T. Moore
影响因子：
3.9
作者：
G. Eglinton
通讯作者：
G. Eglinton
影响因子：
4.2
作者：
Detain Yan;Hua Wang;Q. Fu;Zhonghong Chen;Jinyou He;Zhan Gao
通讯作者：
Detain Yan;Hua Wang;Q. Fu;Zhonghong Chen;Jinyou He;Zhan Gao