火山岩岩相测井识别机理及方法——以徐家围子断陷深层火山岩为例

Mechanism and Method of Logging Identification of Volcanic Facies——By Taking the Deep Volcanic Rocks of Xujiaweizi Fault Depression for Example

火山岩岩相控制储层的储集类型。在徐家围子断陷深层火山岩勘探开发中,岩相研究是决定火山岩储层预测成败的关键之一,其识别精度低,制约了勘探开发的进程。测井资料具有信息丰富、精度高的优势,但应用测井资料识别火山岩岩相还没有成形的方法。以地质理论为指导,通过自然伽马、密度、中子、声波及成像测井对识别岩相的机理进行研究,选择敏感测井信息,建立适用于研究区的测井识别岩相流程和方法。应用该方法在研究区识别出5个相、11个亚相,经20口取心井验证,相的识别符合率为83.8%、亚相为74.2%,说明该套方法具有良好的应用前景。

Reservoir type was controlled by volcanic facies.In deep volcanic rock exploration and development in Xujiaweizi Fault Depression,lithologic facies study was one of the key factors in prediction of volcanic rock reservoirs,the predicting accuracy was low,which constrained the progress of exploration and development.Although logging data had an advantage of rich message and high precision,there was no matured logging interpretation method for identifying the volcanic facies.Based on gelogical theory,this paper selected sensitive logging response to establish logging identification method and technological process of volcanic facies,after the mechanism of volcanic facies interpretation is studied by natural gamma,density,neutron,acoustic wave and imaging logging data,this method is used to recognize 5types of volcanic facies,including 11 types of subfacies.It is proven by coring in 20 wells,the coincidence rate of lithofacies interpretation by logging data is 83.8%,the coincidence rate of subfacies interpretation is 74.2%,it is presented that the method has favorable application future.