华庆地区长6深水沉积低渗透砂岩储层特征

通过大量岩芯、铸体薄片、扫面电镜及物性资料分析，对鄂尔多斯盆地华庆地区长6段砂岩的沉积特征、岩石学特征、孔渗特征、成岩作用类型、孔隙结构及孔隙类型等进行了深入研究。研究表明，以深水浊积砂体为主的长6储层具有沉积物粒度偏细、成分成熟度较低、结构成熟度中等的岩石学特点；储集空间主要是原生粒间孔隙和次生溶蚀孔隙，孔隙结构以中、小孔细喉型为主。研究区孔隙度与渗透率具有较好的正相关性，为一套典型的低孔、低渗到特低孔、特低渗的储层。

ANALYSIS ON CHARACTERISTICS OF DEEPWATER SEDIMENTARY TIGHT SANDSTONE RESERVOIR OF CHANG 6 IN HUAQING AREA

The sedimentary characteristics，lithology characteristics，porositypermeability characteristics，diagenesis types，pore texture and pore types of the reservoir of the Change 6 formation in Huaqing area are studied through analyzing the core，thin sections，casting thin sections and physical property.The result indicates that the deepwater sedimentary sandstone reservoir of Chang 6 formation has the following characters  ultrafined grain size of the deposits，low comparative maturity and moderated textural maturity，the pore types include residual interparticle pores，and secondary dissolution pore.The pore structure is mainly composed by the micropore finethroat type.Between porosity and permeability of the investigated area，there are good positive correlations.It is a typical reservoir from low pore，low osmosis to extra low pore，extra low osmosis.