| 雪峰山西侧北缘五峰组-龙马溪组含笔石页岩热成熟度特征 |
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| 引用本文： | 樊云鹏,刘岩,文志刚,王宗秀,张林炎,唐鹏海,徐耀辉,田永晶,陈吉,严刚.雪峰山西侧北缘五峰组-龙马溪组含笔石页岩热成熟度特征[J].地球科学,2019,44(11):3725-3735. |
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| 作者姓名： | 樊云鹏 刘岩 文志刚 王宗秀 张林炎 唐鹏海 徐耀辉 田永晶 陈吉 严刚 |
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| 作者单位： | 1.长江大学资源与环境学院, 湖北武汉 430100 |
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| 基金项目： | 中国地质调查局地质调查项目DD20160183中国地质调查局地质调查项目DD20160181国家自然科学基金项目41503034国家自然科学基金项目41672117国家油气重大专项2017ZX05001005-002-001油气资源与探测国家重点实验室开放课题PRP-Open/1509刘宝珺地学青年科学基金暨山东省沉积成矿作用与沉积矿产重点实验室开放基金项目DMSM2017084 |
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| 摘 要： | 五峰组-龙马溪组含笔石富有机质页岩是中国目前最成功和最重要的页岩气勘探目标.由于缺乏镜质体，该地层的成熟度一直存在争议.以雪峰山西侧北缘富含笔石的五峰组-龙马溪组页岩为例，采用笔石表皮体反射率来表征其成熟度特征.该套页岩笔石含量丰富，以非粒状笔石表皮体为主，其具有二轴晶光性特征，最大反射率（GRmax）和双反射率之间表现出正相关关系，成熟度越高的笔石表皮体表现出更强的各向异性.同时，该套地层中也含有丰富的沥青颗粒，其随机反射率与笔石表皮体的最大和随机反射率也呈现了正相关性，其各向异性更弱，但其成因复杂，且颗粒细小，测定较困难，因此，相对而言，作为热成熟指标，笔石表皮体反射率更占优势.雪峰山西侧北缘五峰组-龙马溪组含笔石页岩的成熟度较高，EqVRo值均为3.10%以上，达到了过成熟阶段，是页岩气勘探的有利区.
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| 关 键 词： | 页岩气 笔石表皮体反射率 五峰组-龙马溪组 热演化 油气地质 |
| 收稿时间： | 2019-04-27 |
Characteristics of Thermal Maturity of Graptolite-Bearing Shales in Wufeng-Longmaxi Formations on Northern Margin of Xuefeng Mountain |
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| Abstract: | The maturity of the Wufeng-Longmaxi Formation organic-rich shales with graptolites, which is now one of the most successful and important shale gas exploration targets in China, has been controversial due to the lack of vitrinite. In this paper, taking this formation shale located on the northern margin of Xuefeng Mountain as an example, the graptolite reflectance is used to represent the maturity characteristics. It is concluded that this shale is rich in graptolite, mainly composed of non-granular graptolites which have biaxial optical characteristics, and its maximum reflectance (GRmax) and bireflectance are positive. In addition, the higher the maturity of the graptolites, the greater the anisotropy of graptolite reflectance. At the same time, this formation is also rich in asphalt particles, and its random reflectance value is also positively correlated with the maximum and random reflectance of the graptolites, and its anisotropy is weaker than the former. However, the reflectance of asphalt particles is difficult to measure because of its complicated formation factor and smaller size. Relatively speaking, the graptolite reflectance is more dominant as a thermal maturity indicator. The Wufeng-Longmaxi Formation shales located on the northern margin of Xuefeng Mountain is a favorable area for shale gas exploration because of its high maturity. The equivalent vitrinite reflectance values (EqVRo) of this shale has reached more than 3.10%, reaching the over-mature stage. |
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