摘要
广安地区碎屑岩油气藏是目前勘探开发的热点。通过岩心观察、薄片鉴定、X衍射分析、扫描电镜分析等手段,得出了区内凉高山组砂岩属于灰质胶结超低孔低渗极致密储层;区内成岩阶段划分为同生期、早成岩A—B期、中成岩A—B期;强烈持久的成岩作用导致储层致密化,其中强烈的机械压实作用减少砂岩的孔隙,碳酸盐矿物的胶结作用使孔隙度和渗透率显著减少。
Oil and gas accumulation in Guang＇ an is a hot point of oil and gas exploration in Siehuan at present. Drilling core observation, rock section study, X- ray diffraction analysis and SEM observation indicate that the Lianggaoshan Formation is composed of dense calcareous sandstone with super- low porosity and super- low permeability. The diagenesis may be divided into syngenesis, eodiagenesis A - B and mesediagenesis A - B stages. Long- term and intense diagenesis resulted in the compaction of the reservoir, especially, intense mechanical compaction led to the decrease in the porosity, while cementation of carbonate minerals obviously reduced the porosity and permeability.
出处
《四川地质学报》
2007年第3期179-183,共5页
Acta Geologica Sichuan
关键词
凉高山组
致密砂岩
四川广安
dense sandstone
Lianggaoshan Formation
Guang＇an, Sichuan
