The present study aims at characterizing the sedimentological and petrophysical properties of the Middle-Late Miocene Mt Messenger reservoir in Taranaki Basin, New Zealand. It is a detailed study based on availability of sedimentological (petrography, SEM and XRD), well log data (gamma ray, neutron, density, sonic, shallow and deep resistivity, PEF and RFT logs), in addition to conventional and special core analysis data for Mt Messenger reservoir.

The Mt Messenger Formation is considered onshore fan units of low resistivity clastic rocks with high percentage of metamorphic lithic fragments. From the RFT logs, it is composed of two or three compartments partially separated from each other by some tight zones. The reservoir zones are represented by thin beds of well sorted very fine to silty-grained litharenite; sometimes is feldspathic, argillaceous and/or micaceous with very good intergranular porosity of average reaches to 25%. Petrographically and petrophysically four reservoir rock types (RRTs) or hydraulic flow units (HFUs) can be assigned, each with its diagnostic petrophysical properties and storage and flow capacities. The reservoir quality increases to the south at Ngatoro-2 well, where a total of gas- and oil-bearing 5 prospective thin beds are recognized, which are mostly composed of litharenite with very good porosity (21–27.8%) and permeability (63–368 md). Its reservoir quality index (RQI) and flow zone indicator (FZI) indicates fair to good reservoir quality (0.544 = RQI ≤ 1.151 μm, and 1.972 = FZI ≤ 3.049 μm). Presence of argillaceous and/or micaceous materials in addition to the silt-sized grains decreased the reservoir quality from RRT1 samples which are characterized by fair to good reservoir properties (homogeneous pore size distribution, 0.18 = R₃₅ ≤ 1.32 μm) to the RRT4 samples which are considered slightly tight reservoir (slightly heterogeneous pore size distribution, 4.44 = R₃₅ ≤ 9.97 μm).

本研究旨在表征新西兰塔拉纳基盆地中新世中期Mt Messenger储层的沉积学和岩石物理特性。这是一项详细的研究，除了常规和特殊岩心分析之外，还根据沉积学（岩相学，SEM和XRD），测井数据（伽马射线，中子，密度，声波，浅和深电阻率，PEF和RFT测井）的可用性进行了详细研究。信使山水库的数据。

Mt Messenger岩层被认为是具有高变质岩屑碎屑的低电阻率碎屑岩的陆上扇单元。从RFT日志来看，它由两个或三个隔室组成，它们之间由一些紧密的区域部分分隔开。储层区以薄层床为代表，该层床的分类非常细，至粉质粒状锂长石。有时是长石质，泥质和/或云母质，具有非常好的晶间孔隙度，平均可达25％。在岩石学和岩石物理方面，可以分配四种储层岩石类型（RRT）或液压流动单元（HFU），每种类型都具有其诊断岩石物理特性以及存储和流动能力。在Ngatoro-2井的南部，储层质量提高，在那里总共识别出5个含油气的潜在薄层，它们主要由具有良好孔隙率（21–27.8％）和渗透性（63–368 md）的锂锰矿组成。其储层质量指数（RQI）和流区指标（FZI）表示中等至良好的储层质量（0.544 = RQI≤1.151μm，而1.972 = FZI≤3.049μm）。除粉粒大小的颗粒外，还存在泥质和/或云母质的物质降低了RRT1样品的储层质量，RRT1样品的特征是具有中等至良好的储层性质（孔径分布均匀，0.18 = R₃₅  ≤1.32μm）至被认为稍紧贮存器（略异构孔径分布，4.44 = R的RRT4样品₃₅  ≤9.97微米）。