摘要
岩心观察和铸体片鉴定证实,花土沟油田藻灰岩储层发育,储层岩石类型主要为藻纹层灰岩、藻叠层灰岩、亮晶生屑灰岩、亮晶鲕粒灰岩、陆屑泥晶灰岩、藻泥晶灰岩、藻团粒灰岩等,形成于湖盆中某单一藻类勃发时期,沉积过程受陆源碎屑影响较大,成岩阶段只经历了准同生成岩阶段和浅埋藏阶段,成岩作用较弱,对孔隙度影响不大。孔隙类型主要为受到淡水淋滤溶蚀作用和构造作用而形成的次生孔隙,孔隙结构杂乱,无明显规律性。藻灰岩既是生油岩,又是储集岩体,形成自生自储式油藏的条件非常有利。
Core observation and casting thin section identification have confirmed algal limestone reservoirs in Huatugou oilfield,with reservoir rocks mainly consisting of algal laminar limestone,algal stromatolite limestone,sparry bioclastic limestone,oosparite,terrigenous clastic micrite,algal micrite,and algal lump limestone,which were formed in a single algal blooming period in the lake basin and influenced by terrigenous clastic during sedimentary process. The diagenetic stage involves only the penecontemporaneous diagenetic stage and the shallow burial stage,showing weak diagenesis effect on porosity. The pore types mainly constitute secondary porosity formed by fresh water leaching dissolution and tectonic action. The pore structure is disordered,showing no obvious regularity. The algal limestone had served as both source rock and reservoir rock,formed very favorable conditions for self-generation and self-preservation reservoirs.
出处
《特种油气藏》
CAS
CSCD
2010年第2期60-62,75,共4页
Special Oil & Gas Reservoirs
基金
高等学校博士学科点专项科研基金(20060489002)
关键词
花土沟油田
藻灰岩
储层特征
成岩作用
Huatugou oilfield
algal limestone
reservoir characteristics
diagenesis
