巴喀油田八道湾组低渗透砂岩储层特征研究

A Study on the Characteristics of Low Permeability Sandstone Reservoirs of Badaowan Formation in Baka Oilfield

通过大量岩芯、铸体薄片、扫面电镜及物性资料分析,对巴喀油田八道湾组砂岩的沉积特征、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研究。研究表明,八道湾组储层具有沉积物粒度较粗、成分成熟度和结构成熟度低的岩石学特征,储集空间主要是粒内溶蚀孔、少量剩余粒间孔和微裂缝。研究区孔隙度与渗透率具有较好的正相关性,为一典型的低孔、低渗到特低孔、特低渗的储层。

The sedimentary characteristics, lithology characteristics, porosity-permeability characteristics, diagenesis types, pore texture and pore types of the reservoir of Badaowan formation in Baka oilfield are studied through analyzing the core, thin sections, casting thin sections and physical property. The result indicates that the reservoir of Badaowan formation has the following characters： coarse grain size of the deposits, low compositional maturity and low textural maturity, and the pore types include Intragranular dissolved pores, a few remaining intergranular pore and microfracture. Between porosity and permeability of the investigated area, there is good positive correlation. It is a typical reservoir of low pore, low osmosis to extra low pore, extra low osmosis.