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业已发现,白垩纪的发育砂岩可生产无水石油超过5000桶/天。利用测井资料求得的这些砂岩平均含水饱和度为10～60%,其电阻率指数为100～2.5。产水层常常含有残余油,它们的电阻率比值变化范围在1.0到2.0之间。因此,根据测井资料不能可靠地评价生产层,而必须进行生产测试。岩心的矿物和岩石物理详细分析资料表明,在高含水饱和度的含油薄砂层中存在着两种岩石类型:一种岩石含有中等数量的高岭土,其渗透率为达西量级;另一种岩石大量孔
It has been found that Cretaceous developing sandstones produce more than 5,000 barrels of dry oil per day. The average water saturation of these sandstones obtained from logging data is 10-60%, and the resistivity index is 100-2.5. Aquifers often contain residual oils, and their resistivity ratios range from 1.0 to 2.0. Therefore, based on the logging data can not be reliably evaluated production layer, and must be production testing. Detailed analysis of the mineral and rock physics of the core shows that there are two types of rock in the oil-bearing thin sand layer of high water saturation: one rock contains a moderate amount of kaolin, which has a permeability on the order of Darcy; Rock a lot of holes