丽水凹陷古新统储层成岩相测井识别与预测

基于普通薄片、铸体薄片、扫描电镜、阴极发光等资料,结合孔隙度与渗透率等物性资料,识别出东海陆架盆地丽水凹陷古新统储层经历的成岩作用主要有压实作用、胶结作用、交代作用和溶蚀作用,将研究区古新统储层成岩相划分为机械压实成岩相、压实-弱溶蚀成岩相、碳酸盐胶结成岩相和不稳定碎屑溶蚀成岩相等4种类型。通过对研究区古新统储层不同成岩相的自然伽马、自然电位、密度、声波时差和中子等测井曲线响应特征进行定性分析与定量研究,建立了不同成岩相测井交会识别标准图版,并对B A井进行了垂向上的成岩相识别与预测,其结果与实测物性、沉积相定性分析等结论一致性较好,验证了本文提出的成岩相测井识别与预测方法的准确性。

Logging identification and prediction of Paleocene reservoir diagenetic facies in Lishui sag

Based on normal thin sections,casting thin sections,scanning electron microscope analysis,cathodeluminescence and other data,combined with porosity,permeability and other physical properties,it is identified that the diagenesis of Paleocene reservoir in Lishui sag of East China Sea Shelf basin mainly includes compaction,cementation,metasomatism and dissolution.The diagenetic facies of Paleocene reservoir in the study area are divided into four types:mechanical compaction,compaction-weak dissolution,carbonate cementation and unstable clastic dissolution diagenetic facies.According to the qualitative analysis and quantitative research on the log response characteristics of natural gamma ray,natural potential,density,acoustic travel time and neutron well logging curves of different Paleocene reservoir diagenetic facies in the study area,the standard logging crossplot for different diagenetic facies is established;and the vertical diagenetic facies of Well B A are identified and predicted,the results are consistent with the measured physical properties and qualitative analysis of sedimentary facies,which verifies the accuracy of the logging identification and prediction method of diagenetic facies proposed in this paper.