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Lithology and Basic Reservoir Characteristics

机译：岩性和基本储层特征

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摘要

Reservoirs in Pinedale Field exist in the Lance Formation and the upper portion of the Mesaverde Group (Ericson Sandstone, upper Rock Springs Formation). Production comes from very fine-medium grained, non-marine sandstones with varying degrees of natural fracturing. Gross sandstone within the Lance Formation, the primary reservoir interval, is as much as 1,600 ft. Pay definition is commonly based on log data (Fig. 3.1). Experience has shown that sandstones with gamma ray values < 65 API units, density porosity > 8% and RT levels > 40 ohms will produce at economic rates after treatment. Using these limits, operators have defined net pay of 100-500 ft in wells drilled to date. Water saturation in these sands is usually less than 35%. A type log for a productive well in the Mesa area (north Pinedale Field) is shown in Fig. 3.1. Marked on this log are the Cretaceous-Tertiary boundary and the top of sustained gas flare within the upper Lance. Also indicated are a number of higher quality gas-bearing sands. This log includes approximately 1,400 ft of the upper Lance (～900 ft within the reservoir portion of the formation) and shows the high degree of interbedding between sands of varying quality, siltstones and shales.
机译：Pinedale油田的储层存在于Lance组和Mesaverde组上部（Ericson砂岩，上部Rock Springs组）。产品来自具有中等程度压裂程度的中细粒非海洋砂岩。兰斯组内的毛砂岩（主要储集层段）高达1600英尺。储层定义通常基于测井数据（图3.1）。经验表明，经过处理后，伽马射线值小于65 API单位，密度孔隙率大于8％，RT值大于40欧姆的砂岩将以经济的速度生产。使用这些限制，运营商已经定义了迄今为止已钻探的井中100-500英尺净收入。这些沙子中的水饱和度通常小于35％。图3.1显示了Mesa地区（北Pinedale油田）生产井的类型测井。在该测井曲线上标出的是白垩纪-第三纪边界以及上兰斯内持续的火炬顶。还指出了许多高质量的含气砂。该测井记录包括大约1400英尺的上兰斯（地层储层内约900英尺），并显示了不同质量的砂，粉砂岩和页岩之间的高度夹层。

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