珠江口盆地礁灰岩储层特征精细表征

珠江口盆地L油田礁灰岩储层中裂缝及溶孔发育，储层非均质性强，给储层评价及油田生产带来了极大困难。随钻电阻率成像测井能够提供高分辨率电阻率图像，能够准确把握储层沉积和构造特征。将随钻高分辨率电阻率成像测井引入对礁灰岩岩石类型判别、裂缝精细评价、次生溶蚀综合分析及产能主控因素研究中。结果表明，高分辨电阻率成像技术能够准确分辨礁灰岩储层的岩石类型，精确评价储层裂缝类型及裂缝特征，并对次生溶蚀进行了定性及定量精细分析。最后综合所有电阻率成像解释成果探讨了礁灰岩储层产能的主控因素，相关评价结果与油田的生产和控水技术的作业认识吻合。随钻高分辨率电阻率成像的综合分析应用，既能够达到储层精细表征的目的，又为L油田调整井控水设计提供了强有力的依据，并对同类油藏储层精细描述具有较大的推广价值。

Fine Characterization of Reef Limestone Reservoirs in Pearl River Mouth Basin,South China Sea

The reef limestone reservoir of L Oilfield is characterized by strong heterogeneity with the development of fractures and dissolution pores,which brought out big challenge for reservoir evaluation and production.Logging while drilling(LWD)image logging can provide resistivity images with high resolution,which can give decision-makers an in-depth understanding on the sedimentary and structural characteristics of reservoirs.The high-resolution resistivity image is utilized for the first time to identify reef limestone category,evaluate fracture,analyze secondary dissolution porosity and investigate productivity controlling factors.The results show that rock types of reef limestone can be distinguished accurately by high-resolution resistivity image data.Moreover,fracture types and characteristics can be evaluated precisely by LWD image.Furthermore,qualitive and quantitative analysis of dissolution pores are carried out based on LWD image logging.In addition,the main control factors of reef limestone reservoir productivity are discussed based on all the interpretation results.All related evaluation results are consistent with the operation output of oilfield production and water control technology.The comprehensive analysis of highresolution resistivity imaging not only achieve the obj ective of fine characterization of reef limestone reservoir,but also provide a strong reference for the design of reef limestone reservoir completion plan and give decision-makers a specific interpretation model for similar oil/gas field.