华庆地区长6储层四性关系及有效厚度下限研究

华庆地区长6储层主体为三角洲相沉积,储层主要为细砂岩。本次研究通过薄片鉴定、压汞、测井等资料,对研究区目的层位的"四性"关系进行了研究,认为长6储层属于典型的低孔低渗油层,岩性、物性的差异控制了储层油藏的富集程度,确定了储层物性下限的标准:孔隙度为8%,渗透率为0.08×10-3μm2;电性下限电阻率为16Ω.m,声波时差为215μs/m。通过对储层参数定量解释模型的优化,提高了储层参数计算精度,避免了有效厚度的漏失;并利用测井方法、压汞资料和密闭取心方法综合确定了长6油藏含油饱和度储量计算取值为71%。

Research on the Four-Property Relation and Net Pay Cut-Off Thickness of Chang-6 Reservoir in Huaqing Region

The main body of Chang-6 reservoir in Huaqing region is delta deposition,with the lithology being mainlythe fine sandstone.Four-property relation of target section in the region were studied by thin section,mercury penetration,logging,showing that ① Chang-6 reservoir in the region belongs to typical low-porosity and low-permeanbility oil interval,② diversity between lithology and physical property controls the enrichment of the reservoir,and ③ cut-off properties standard are thus determined with a porosity of 8% and a permeanbiliy of 0.08×10^-3μm^2,and ③ the lower limit of electrical property is determined to be 16 Ω·m and the acoustic time to be 215 μs/m.Via optimizing the reservoir parameters of quantitative interpretation model,the calculation accurancy of the reservoir parameters increases,whichavoided the loss of effective thickness.Finally,in combination with logging method,mercury penetration data,and pressure coring,the research also confirms that the oil-saturation of Chang-6 reservoir is calculated as 71%.