摘要
岩心及薄片观察显示,鄂尔多斯盆地天环北段奥陶系桌子山组和克里摩里组广泛发育白云岩储层,储层岩性主要为晶粒白云岩和颗粒白云岩,且属于埋藏白云岩化成因,储层储集空间类型主要包括晶间孔、晶间溶孔以及非组构选择性溶蚀孔洞和溶缝。成岩-孔隙演化分析表明,研究区白云岩储层主要由埋藏云化作用、表生岩溶作用和埋藏岩溶作用形成,且优质储层分布受岩相、白云岩厚度、岩溶古地貌及断裂等控制。克里摩里组白云岩储层主要分布于克里摩里组剥蚀线与铁克苏庙—马家滩一线地区,桌子山组白云岩储层主要发育在中央古隆起至乌拉力克组剥蚀线之间地区。研究区生储盖层配置关系良好,具备形成大型天然气藏的有利条件,局部构造如断层遮挡和褶皱是寻找有利勘探目标的重要方向。
The observation of cores and thin sections shows that dolomite reservoir widely developed in Zhuozishan formation andKelimoli formation of Ordovieian in north Tianhuan depression of Ordos Basin. The reservoir lithology is mainly crystalline grain dolo-mite and grain dolomite, and the dolomite belongs to the burial dolomitization origin. The storage space types of the dolomite reservoirinclude intergranular pore,intergranular dissolved pore, non fabric selective dissolved pore and dissolved fracture. According to the dia-genetic evolution analysis of the dolomite in Zhuozishan formation and Kelimoli formation, the dolomite reservoir in the study area wasformed mainly by dolomitization, supergene karstification and burial karstification, and the distribution of high-quality reservoir is con-trolled by lithofacies and dolomite thickness and paleokarst landform and faults. The dolomite reservoir of Kelimoli formation mainly dis-tributes in the area between the denudation line of Kelimoli formation and the connection line of Tiekesumiao with Majiatan, and the dol-omite reservoirs of Zhuozishan formation mainly developed in the area between central uplift and the denudation line of Kelimoli forma-tion. There is good source-reservoir-cap rock assemblage in the study area, and therefore there are the favorable conditions for forminglarge scale natural gas reservoirs. Local structures such as fault blocks and folds are favorable exploration targets.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2016年第1期1-9,共9页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
"十二五"国家攻关项目一级专题"海相碳酸盐岩沉积与有效储层大型化发育机理与分布研究"(二期)(编号:2011ZX05004-002)
关键词
白云岩储层
储层特征
储层分布
奥陶系
天环坳陷
鄂尔多斯盆地
dolomite reservoir
reservoir characteristic
reservoir distribution
Ordovician
Tianhuan Depression
Ordos Basin
