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DMR Porosity Can Better Estimate Tight Gas Sand Porosity

机译:DMR孔隙率可以更好地估算致密气砂孔隙率

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摘要

Karotažni dijagrami nuklearne magnetske rezonancije (NMR) razlikuju se od uobičajenih dijagrama neutronske, zvučne, karotaže gustoće i karotaže metodom otpora, jer NMR mjerenja daju samo informacije o fluidima u stijeni i uglavnom su neosjetljivi na svojstva matične stijene. Glavni zadatak procjene parametara je točan izračun šupljikavosti i propusnosti stijene te ispravna identifikacija prirode i količine sadržanih fluida (voda, nafta, plin). Cilj ovog članka je predstaviti empirijsku metodu u kojoj su kombinirani gustoća i NMR šupljikavost i provjereni u odnosu na jezgru. Ta nova šupljikavost je nazvana DMR šupljikavost (gustoća - magnetska rezonancija). U prošlosti su se mjerenja neutron/gustoća koristila za određivanje šupljikavosti stijene. Dok se s time postižu prihvatljivi rezultati u čistim kapljevinom ispunjenim litološkim jedinicama (pijesci), djelovanje litologije, sadržani ugljikovodik (plin) i heterogenost formacije u glinovitim pijescima povećavaju nepouzdanost izračunatih šupljikavosti. Tehnika kod koje se koristi kombinacija NMR vremena slabljenja (relaxation time - vrijeme gubitka koherentne energije protona u stijeni) i podaci volumne te|ine, opisani u ovom članku, značajno smanjuju nepouzdanost dobivenih parametara karotaže zbog isključivanja neutronske karotaže. Zbog toga nije potrebno označavanje i korekcija gustoće fluida za područja prodiranja.%Nuclear magnetic resonance (NMR) logs differ from conventional neutron, density, sonic and resistivity logs because the NMR measurements provide information only on formation fluids and are generally insensitive to matrix properties. The main task of formation evaluation is to calculate accurate formation porosities, permeabilities and identify properly the nature and amount of saturating fluids (water, oil, gas). The focus of this paper is to present an empirical method in which density and NMR porosities are combined and calibrated to core. The new porosity is termed DMR (density-magnetic resonance) porosity. Historically, neutron/density measurements have been used to derive formation porosity. While this yields acceptable results in clean liquid-filled lithologies (sands), the effects of lithology, hydrocarbon fill (gas), and formation heterogeneity in shaly sands increases the uncertainty in computed porosities. The technique of using combined NMR relaxation times and bulk density data described in this paper significantly reduces uncertainty in derived logging parameters through elimination of the neutron log. This removes the need to characterize, and correct for flushed zone fluid densities. This paper describes the application of DMR technique in cored wells in the Obaiyed field; Western Desert, Egypt and it discuss the results obtained, limitations and benefits, along with the data acquisition requirements. Field examples demonstrate the importance of the (DMR) technique in place of the use of NMR or conventional logs separately in determining formation porosity and gas saturation in tight gas sand reservoirs.
机译:核磁共振(NMR)测井图与常规中子图,声音,密度测井和电阻测井图不同,因为NMR测量仅提供有关岩石流体的信息,并且通常对母体岩石特性不敏感。估算参数的主要任务是准确计算岩石的孔隙率和渗透率,以及正确识别所含流体(水,油,气)的性质和量。本文的目的是提供一种结合密度和NMR孔隙率并针对核进行验证的经验方法。这种新的孔隙率称为DMR孔隙率(密度-磁共振)。过去,中子/密度测量已用于确定岩石孔隙度。尽管在纯液体填充的岩性单元(砂)中获得了可接受的结果,但岩性的作用,烃(气)含量和粘土砂中地层的不均一性增加了所计算孔隙率的不可靠性。本文所述的结合NMR衰减时间和体积重量数据的技术,由于排除了中子测井,大大降低了获得的测井参数的不可靠性。因此,不需要对渗透区域的流体密度进行标记和校正。%核磁共振(NMR)测井曲线与常规中子,密度,声波和阻力测井曲线不同,因为NMR测量仅提供有关地层流体的信息,并且通常对基质特性不敏感。地层评估的主要任务是计算准确的地层孔隙度,渗透率,并正确识别饱和流体(水,油,气)的性质和数量。本文的重点是提出一种结合密度和NMR孔隙率并校准到岩心的经验方法。新的孔隙度称为DMR(密度磁共振)孔隙度。从历史上看,中子/密度测量已用于得出孔隙的形成。尽管这在干净的充满液体的岩性(砂)中产生了可接受的结果,但岩性,岩性填充(气)和页岩砂中地层非均质性的影响增加了计算孔隙度的不确定性。本文所述的结合使用NMR弛豫时间和堆积密度数据的技术通过消除中子测井,显着降低了导出测井参数的不确定性。这消除了表征和校正冲洗区流体密度的需要。本文介绍了DMR技术在Obaiyed油田带芯井中的应用。埃及西部沙漠及其讨论了获得的结果,局限性和好处以及数据采集要求。现场实例表明,在确定致密气砂储层中的地层孔隙度和气体饱和度方面,(DMR)技术的重要性代替了单独使用NMR或常规测井。

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