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首页> 外文会议>SPE/AAPG/SEG Unconventional Resources Technology Conference >Towards a More Accurate Gas-in-Place Model:Reconciling Gas Storage with Gas Production in the Marcellus Shale,Appalachian Basin,USA
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Towards a More Accurate Gas-in-Place Model:Reconciling Gas Storage with Gas Production in the Marcellus Shale,Appalachian Basin,USA

机译：走向更准确的燃气模型：在美国阿巴拉契亚盆地的Marcellus Shale中调和气体生产与天然气生产

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The highly productive nature of the Marcellus Shale has led to an interesting observation where individual well estimated ultimate recoveries(EURs)often exceed the calculated gas-in-place(GIP).These observations have led us to question our understanding of GIP,vertical and horizontal drainage,and our understanding of downhole pressure measurements.This paper presents our modification of the GIP estimate in an effort to achieve more accurate values which can lead to a better understanding of future Marcellus production and development.Here we focus on three aspects to improve GIP calculations:1)implementation of the Ambrose-Hartman correction to account for pore space occupied by adsorbed gas;2)we provide evidence that measured pore water is mostly of anthropogenic origin and should not be considered in effective porosity calculations,3)we provide evidence from outcrop observations for considering a dynamic pore pressure throughout the rock.Pressurized rotary sidewall cores were collected on a Marcellus well drilled under slightly overbalanced conditions to minimize the escape of gas.After measuring total gas evacuated from the cores,total uptake experiments were conducted to determine the storage capacity of the samples at varying pressures.Isotopic analysis of core water was used to determine the source of the water.Finally,field analysis of the occurrence of natural hydraulic fractures compared to total organic carbon(TOC)was used to estimate the variation of overpressure development at a bed scale.Total uptake experiments confirm the necessity of the Ambrose-Hartman correction to quantify the free GIP component.Analysis of core water indicates that the majority of water encountered in the Marcellus Shale results from the drilling and completion process with minimal evidence of mobile in situ water.Finally,the increased density of natural hydraulic fractures(NHFs)associated with increasing TOC indicates a strong relationship between overpressure development and TOC at the bed scale,suggesting the need to treat pore pressure as a dynamic value across the stratigraphic interval.When these three aspects are considered,GIP values increase substantially.
机译：Marcellus Shale的高度高效性质导致了一个有趣的观察，其中个性估计的最终恢复（EURS）通常超过计算的燃气原位（GIP）。这些观察结果导致我们质疑我们对吉普，垂直的理解水平排水，以及我们对井下压力测量的理解。本文提出了我们对GIP估计的修改，以实现更准确的价值观，这可以更好地了解未来的Marcellus生产和发展。我们专注于改进的三个方面GIP计算：1）实施Ambrose-Hartman校正，以解释吸附气体占用的孔隙空间; 2）我们提供了测量的孔隙水主要是人为原点，不应考虑有效的孔隙率计算，3）我们提供来自露天观察的证据，用于考虑整个岩石的动态孔隙压力。Checionalized旋转侧壁核心收集在Marcellus钻井下钻孔井下钻孔，以最大限度地减少气体的逃逸。测量从核心抽出的总气体，进行了总摄取实验以确定样品在不同压力下的储存能力。使用核心水分分析为了确定水的来源。最后，与总有机碳（TOC）相比，天然液压骨折发生的现场分析来估计床单中的过压发育的变化。滴注实验证实了ambrose的必要性-Hartman校正量化免费的GIP组件。核心水分析表明Marcellus页岩中遇到的大多数水从钻井和完井过程中产生了最小的，掌握原位水的依据。最后，天然液压骨折的增加的密度增加（NHFS）与增加TAC相关的NHF表示过压发展之间的牢固关系C在床单上，表明需要将孔隙压力视为地层间隔的动态值。当考虑这三个方面时，GIP值大幅增加。

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