东北石油大学学报2012，Vol.36Issue(5)：22-28,7.DOI:10.3969/j.issn.2095-4107.2012.05.005
鄂尔多斯盆地延长气田山西组致密砂岩储层特征
Characteristics of tight sandstone of Shanxi formation reservoir in the Yanchang gas field, Ordos basin
摘要
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 are-nite 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 intercrys-tal 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.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Key words
Ordos Basin/ Yanchang gas field/ Shanxi formation/ tight sandstone/ low porosity and low permeability reservoirs/ reservoir characteristics/ densification/ optimization分类
能源科技引用本文复制引用
赵佳楠,姜文斌..鄂尔多斯盆地延长气田山西组致密砂岩储层特征[J].东北石油大学学报,2012,36(5):22-28,7.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) （2009GYXQ-15）
