| 鄂尔多斯盆地延长气田山西组致密砂岩储层特征 |
| |
| 作者姓名： | 赵佳楠 姜文斌 |
| |
| 作者单位： | 中国地质大学(北京)地球科学与资源学院;中国地质大学(北京)教育部海相储层演化与油气富集机理重点实验室 |
| |
| 基金项目： | 中国重点地区页岩气资源潜力及有利区优选项目(2009GYXQ-15) |
| |
| 摘 要： | 根据薄片鉴定、物性测试、压汞实验、X线衍射和扫描电镜分析等,研究鄂尔多斯盆地延长气田山西组致密砂岩储层特征.结果表明:延长气田山西组致密砂岩具特低孔低渗特性,储层的储集空间类型主要为碎屑颗粒内的粒内溶孔和粒间溶孔,次为裂缝.孔喉属细孔—微喉型,排驱压力大,孔隙结构差,孔渗相关性差.压实作用和胶结作用是导致砂岩致密化的主要因素,成岩作用早期的煤系地层有机酸性环境和成岩作用晚期的交代作用加速砂岩致密化,可溶性物质缺乏使得砂岩物性改善受阻.裂隙体系建立是改善储层物性的主要因素和转折点,使得溶蚀作用复强,溶蚀作用是储层优质化的"催化剂",能够提升储层储集油气能力.
|
| 关 键 词： | 鄂尔多斯盆地 延长气田 山西组 致密砂岩 低孔低渗储层 储层物性 致密化 优质化 |
Characteristics of tight sandstone of Shanxi formation reservoir in the Yanchang gas field,Ordos basin |
| |
| Authors: | ZHAO Jia-nan JIANG Wen-bin |
| |
| Institution: | 1.School of the Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;2.Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism of the Ministry of Education,China University of Geosciences(Beijing),Beijing 100083,China) |
| |
| Abstract: | The oil and gas reserves of Ordos Basin are huge.Yanchang gas field is located in Yishan Slope of the southeast of the Ordos Basin.The main pay zone reservoir is quartz sandstone,quartz arenite and litharenite.Identification of petrographic thin section,the data of X-ray diffraction and mercury penetration experiment and so on are involved to analyze the reservoir characteristics of tight sandstone of Shanxi Formation in Yanchang gas field.The reservoir is low porosity low permeability tight reservoir.The main types of reservoir space are intragranular dissolved pores of the clast and intercrystal dissolved pores.Pore throat is considered as pinhole or micro pore throat.The other reservoir characteristics are huge replacement pressure,bad pore structure and bad correlation of porosity and permeability.The main reasons,that sandstone reservoir is caused to be densification,are compaction and cementation.The factors of accelerating the densification are a coaly bearing acid environment at the early stage of diagenesis and metasomatism at the late stage of diagenesis.Besides,tight sandstone is obstructed to improve reservoir characteristics because of lack of dissolvable components.The principal factors of improving reservoir characteristics are the construction of fracture system,which cause reservoirs to be optimized.The promotive factors of improving reservoir characteristics are dissolution. |
| |
| Keywords: | Ordos Basin Yanchang gas field Shanxi formation tight sandstone low porosity and low permeability reservoirs reservoir characteristics densification optimization |
| 本文献已被 CNKI 等数据库收录！ |
|
