潜山缝洞型储层随钻快速评价方法——以珠江口盆地惠州26-6构造为例

A method for rapid evaluation while drilling for fractured reservoirs in buried hill:A case study of HZ 26⁃6 Structure,Pearl River Mouth Basin

随着南海东部地质认识的深入和勘探思路的转变,近年来在珠江口盆地惠州26-6构造中生界潜山油气勘探中获重大突破。研究表明,惠州26-6构造潜山储层以裂缝-孔洞型及裂缝型的蚀变闪长岩及蚀变花岗岩为主,储层特征十分复杂,目前主要依靠钻后测井、取心及实验分析等方法来评价储层有效性,在随钻过程中难以对储层进行快速、准确的评价,严重影响下一步勘探决策。通过对惠州26-6构造已钻井的录井、测井、测试资料进行分析,厘清了研究区中生界潜山储层的录井响应特征,优选综合录井地质参数和工程参数建立了中生界潜山缝洞型储层有效性录井评价标准,完善了基于综合录井资料的潜山储层有效性评价方法。实践应用表明,潜山储层有效性综合录井参数评价方法在研究区具有较好的适用性,该方法对珠江口盆地潜山缝洞型储层随钻快速评价有着重要的意义。

With the deepening of geological understanding and the change of exploration ideas in the eastern South China Sea,a major breakthrough has been made in the oil and gas exploration in the Mesozoic buried hill of HZ 26⁃6 structure in Huizhou Depression in recent years.The study shows that the buried hill reservoir of HZ 26⁃6 structure is mainly composed of altered diorite and granite with fracture⁃pore or fractured types.The reservoir characteristics are very complex,which makes it difficult to quickly and accurately evaluate the reservoir effectiveness while drilling by post⁃drilling logging,coring,experimental analysis and other methods,and seriously affects the decision of the next exploration.Based on the analysis of the well mud logging,logging and testing data of drilled wells in the HZ 26⁃6 structure,the logging response characteristics are clarified,and the effectiveness evaluation standard for the fracture⁃cave reservoir in the Mesozoic buried hill is established through optimizing the comprehensive geological and engineering parameters,which improves the effectiveness evaluation method based on the comprehensive logging data for fractured reservoirs in buried hill.The practical application shows that the effectiveness evaluation method for fractured reservoirs in buried hill with comprehensive logging parameters has good applicability in the study area,and this method is of great significance for the rapid evaluation fracture⁃cave reservoir in buried hill while drilling in Pearl River Mouth Basin.