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黔西北燕子口地区五峰组—龙马溪组泥页岩储层特征
兰叶芳,吴海枝,任传建,孟中能,周汝贤
0
(贵州工程应用技术学院矿业工程学院,贵州毕节551700)
摘要:
在野外地质露头剖面测量和样品采集的基础上,通过铸体薄片鉴定、阴极发光、X射线衍射、扫描电镜、总有机碳含量和镜质组反射率等地球化学分析,结合区域地质背景和前人研究成果,探讨黔西北燕子口地区奥陶系五峰组—志留系龙马溪组泥页岩储层特征。结果表明:①研究区五峰组—龙马溪组主要沉积浅水—深水陆棚相的粉砂质页岩、云灰质页岩、泥质粉砂岩,烃源岩主要为五峰组以及龙马溪组下部黑色炭质/硅质页岩。②矿物组成主要由黏土矿物(22%~51%)、石英(21%~41%)和碳酸盐矿物(10%~35%)构成,含少量的黄铁矿和石膏,其中黏土矿物以伊/蒙混层和伊利石为主,总体具有脆性矿物含量高(平均值为59.4%),非均质性强,纵向变化大的特征。③储集空间主要为层间裂缝及溶蚀孔、顺层缝隙,尤以碳酸盐和长石溶蚀现象较明显,有机质孔不发育。④五峰组—龙马溪组总有机碳含量大于1%的中等以上的有效烃源岩的厚度约为20 m。⑤等效镜质组反射率约为2.5%,热演化程度高,处于过成熟的干气阶段,尚具备一定的生烃能力。
关键词:  泥页岩  储层  地球化学特征  五峰组—龙马溪组  燕子口地区  黔西北
DOI:10.13673/j.cnki.cn37-1359/te.2021.01.014
基金项目:贵州省科技合作计划项目“黔北奥陶—志留系页岩气聚集地质条件解剖及资源潜力评价”(黔科合LH字[2016]7050号)和“蚁群算法结合复杂水文地质条件的毕节地区煤矿突水灾害预测”(黔科合LH字[2017]7017号),贵州省科技计划项目“黔西北地区二叠系龙潭组页岩气富集关键地质因素与勘探潜力评价”(黔科合基础[2017]1407),贵州工程应用技术学院高层次人才科研启动基金(院科合字G2017006)。
Shale reservoir characteristics of Wufeng-Longmaxi Formation in Yanzikou area,northwestern Guizhou
LAN Yefang,WU Haizhi,REN Chuanjian,MENG Zhongneng,ZHOU Ruxian
(School of Mining Engineering,Guizhou University of Engineering Science,Bijie City,Guizhou Province,551700,China)
Abstract:
On the basis of the outcrop profile measurement and sample collection,through casting sheet identification,cathodoluminescence analysis,X-ray diffraction analysis,scanning electron microscopy analysis,geochemical analysis of total organic carbon content and vitrinite reflectance,the characteristics of shale reservoirs in the Ordovician Wufeng FormationSilurian Longmaxi Formation(Wufeng-Longmaxi Formation)were discussed combined with the regional geological background and previous research results in Yanzikou area,northwestern Guizhou with the following results obtained:①The rock types of Wufeng-Longmaxi Formation are dominated by silty shale,dolomitic/calcareous shale,and argillaceous siltstone deposited in shallow water-deep water shelf environment,and the black carbonaceous/siliceous shale in Wufeng Formation and lower Longmaxi Formation are potential source rocks. ②The mineral composition mainly includes clay minerals (22%-51%),quartz(21%-41%),and carbonate minerals(10%-35%),with a small amount of pyrite and gypsum,of which clay minerals mainly include illite/smectite mixed layer and illite. Generally,it has a large proportion of brittle miner? als(average 59.4%),strong heterogeneity,and great vertical variation. ③Reservoir space consists mainly of interlayer cracks,dissolution pores,and bedding fractures.Carbonate and feldspar dissolution phenomena are especially obvious,but organic pores are underdeveloped. ④The effective thickness of source rocks with a total organic carbon content of more than 1% in the Wufeng-Longmaxi Formation is about 20 m. ⑤The equivalent vitrinite reflectance of the Wufeng-Longmaxi Formation is around 2.5%,showing its high degree of thermal evolution. It is in the stage of overmature dry gas and is still capable of hydrocarbon generation.
Key words:  shale  reservoir  geochemical characteristics  Wufeng-Longmaxi Formation  Yanzikou area  northwestern Guizhou

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