| 正安地区五峰组-龙马溪组页岩储层特征及控制因素 |
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| 引用本文： | 张福,黄艺,蓝宝锋,李龙,刘婷,刘睿,江定川.正安地区五峰组-龙马溪组页岩储层特征及控制因素[J].地质科技通报,2021,40(1):49-56. |
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| 作者姓名： | 张福 黄艺 蓝宝锋 李龙 刘婷 刘睿 江定川 |
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| 作者单位： | 贵州乌江能源集团有限责任公司;贵州省土地矿产资源储备局;西南石油大学地球科学与技术学院 |
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| 基金项目： | 国家自然科学基金项目41702157贵州省地勘基金项目GZMC-ZG20192014-4 |
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| 摘 要： | 四川盆地以东的复杂构造变形带拥有巨大的页岩气资源潜力,但目前勘探开发不足。为了支撑复杂构造变形带的页岩气勘探开发,针对复杂构造变形带内正安地区五峰组-龙马溪组页岩钻井岩心,开展了矿物学、有机地球化学、岩石学分析测试,探讨了页岩储层特征及主控因素。正安地区五峰组-龙马溪组页岩储层石英质量分数高达60%~80%,以硅质页岩为主,脆性程度高。石英主要是无机成因,包括原生碎屑石英沉积和黏土矿物转化而成的次生石英。原生碎屑石英、层状黏土颗粒的压实脆裂增大了孔隙空间,但次生石英的沉淀、充填减小了矿物颗粒间的骨架孔隙。正安地区五峰组-龙马溪组页岩储层总w(TOC)高达5.8%,有机质中无定形腐泥组大于80%,沥青反射率介于2.6%~3.1%,有机质热解而成的有机孔显著增大了孔隙度,但有机孔隙后期遭受构造挤压变形,多坍塌成狭长的多边形。
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| 关 键 词： | 有机孔 无机孔 复杂构造变形带 五峰组-龙马溪组页岩 |
| 收稿时间： | 2019-11-21 |
Characteristics and controlling factors of shale reservoir in Wufeng Formation-Longmaxi Formation of the Zheng'an area |
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| Zhang Fu,Huang Yi,Lan Baofeng,Li Long,Liu Ting,Liu Rui,Jiang Dingchuan.Characteristics and controlling factors of shale reservoir in Wufeng Formation-Longmaxi Formation of the Zheng'an area[J].Bulletin of Geological Science and Technology,2021,40(1):49-56. |
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| Authors: | Zhang Fu Huang Yi Lan Baofeng Li Long Liu Ting Liu Rui Jiang Dingchuan |
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| Affiliation: | (Guizhou Wujiang Energy Group Co.LTD,Guiyang 563400,China;Bureau of Land and Mineral Resources Reserves of Guizhou Province,Guiyang 550008,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China) |
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| Abstract: | The complex tectonic deformation zone in the east of the Sichuan Basin has a great potential of shale-gas resources, but has not been commercially exploited yet.This paper utilizes the mineralogical, organic chemical, and petrologic data of the Wufeng Formation-Longmaxi Formation shale cores, which was deposited in the transition zone of deep-shallow continental shelf and is currently located on the Zheng'an area in the complex tectonic deformation zone, to uncover the characteristics and main controlling factors of gas-shale reservoir in the tectonic deformation zone.The Wufeng Formation-Longmaxi Formation shale samples in the Zheng'an area have a high quartz component, which ranges from 60% to 80% and contributes a high brittleness index.Quartz in the Wufeng Formation-Longmaxi Formation shale is dominant by inorganic origins, including the primary clastic quartz deposition and the secondary quartz from clay diagenesis.The cracking of primary clastic quartz grains or bending of laminated clay under tectonic compaction increases pore space; whereas the filling of secondary quartz into the pore space between mineral grains decreases the bulk porosity.The Wufeng Formation-Longmaxi Formation shale samples in the Zheng'an area have a total organic carbon(TOC) content up to 5.8%, a content of amorphous organic matter more than 80%, and a bitumen reflectance of 2.6%-3.1%.The cracking of organic matter generated number of organic pores, which improved the bulk porosity first and then was compacted and collapsed to be long and narrow polygons. |
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| Keywords: | organic pore inorganic pore complex tectonic deformation zone Wufeng Formation-Longmaxi Formation shale |
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