安塞特低渗储层钙质夹层识别及其对开发的影响

安塞特低渗储层钙质夹层发育,对油田开发具有负面影响。针对这一问题,通过岩心观察、滴水滴酸实验、CT扫描、高强度X-衍射、铸体薄片研究、测井曲线分析等综合手段进行研究,认识到钙质夹层具有高密度、低自然伽马、低声波时差、高电阻的特点,提出了一种有效的钙质夹层识别方法。在油田开发中,钙质夹层不但遮挡剩余油运移,而且形成水窜通道,为此需要采取油井地层深部处理措施或采用注水井分单砂体注水来提高和改善油藏开发效果。

Identification of calcareous intercalated layer and its impact on development of extra-low permeability reservoirs in Ansai oilfield

Calcareous intercalated layers in extra -low permeability reservoir have a negative effect on Ansai oilfield development .In order to solve this problem ,based on integrating core observation ,CT scan,high strength X-ray diffrac-tion （ XRD） ,casting thin sections ,and well log ,it was recognized that the calcareous intercalated layer has characteristics of high density ,low natural gamma ,low acoustic time and high resistance .As a result ,an effective identification method for the calcareous intercalated layer was proposed .In the oilfield development ,the calcareous intercalated layer can keep out remaining oil migration and lead to water channeling .Therefore,the formation deep treatment for production wells and the single sandbody water injection are need cd to improve reservoir development effect .