华庆地区长6储层四性关系及有效厚度下限研究
Research on the Four-Property Relation and Net Pay Cut-Off Thickness of Chang-6 Reservoir in Huaqing Region
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摘要: 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%。Abstract: The main body of Chang-6 reservoir in Huaqing region is delta deposition,with the lithology being mainly the fine sand stone.Four-property relation of target section in the region were studied by thin section,mercury penetration,logging,showing that①Chang-6 reservoir in the region belongs to typical low-porosity and low-permeanbility oil interval,②diversity between lithology and physical property controls the enrichment of the reservoir,and ③cut-off properties standard are thus determined with a porosity of 8% and a permeanbiliy of 0.08×10-3μm2,and ③the lower limit of electrical property is determined to be 16Ω·m and the acoustic time to be 215μs/m.
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