用测井曲线形态分析油藏沉积环境

不同的沉积环境具有不同的水动力特点,故不同沉积环境中形成的砂岩体或沉积层序在粒度、分选性以及泥质含量等方面便具有不同的特征。由于测井曲线可以反映这些特征沿钻孔剖面的变化情况,因此测井曲线可以提供沉积环境方面的重要信息。显然,如果预先掌握了测井曲线的形态与砂岩体或沉积层序的特征之间的关系,就可以利用这些关系来对新获得的测井曲线作出正确的地质解释,从而为分析沉积环境提供有价值的资料。     

松辽盆地兴城地区营城组火山岩岩性的测井识别方法

综合岩心、薄片、扫描电镜、地球化学等多种分析测试手段,对研究区火山岩岩石类型进行了划分。以各种岩性测井为基础,分析不同岩性在各种测井曲线或成像图上的响应特征,进而应用交会图、聚类分析及成像测井等手段建立岩性识别模式,有效地识别研究区火山岩不同岩性,总结出适合研究区火山岩岩性测井识别方法。实践证明,应用效果较好。     

复杂岩性砂岩储层岩性分类渗透率计算方法

RE地区沉积环境多样,砂岩储层存在多种岩性,常规渗透率评价模型难以满足渗透率计算精度要求。主要目的层岩性包含石英砂岩、凝灰质砂岩和泥质砂岩三种岩性,不同岩性岩石所含胶结物和胶结方式差异大,致使物性差异明显。文中首先通过测井曲线识别储层的三种主要岩性,再分别建立了不同岩性储层渗透率计算模型,渗透率计算结果符合精度要求。     

石油工业专业基础知识系列讲座 第四讲地球物理测井

勘探开发石油必须钻井，需认识油层，直接的办法就是从井中把地下油层的岩石取上来，加以分析研究。但这样做很费时，也很费钱。所以，在实际工作中，除在油田勘探开发初期，钻为数有限的取心井外，主要采用一种间接认识油层的方法，即地球物理测井。岩石的地质特性与物理性质有着很密切的关系。当岩石的地质性质变化时，它的物理性质也相应发生变化。所以人们通过对地下岩石的各种物理性质的测量，可以间接认识岩石的各种地质性质。在油气勘探与开发过程中，研究储集层的物理特性和含于其中油、气、水的物理特性技术称为地球物理测井。其内…     

模式聚类识别碳酸盐岩台地浅滩岩相

由于不同沉积环境形成的岩石类型,也就是岩相,其矿物成分、结构、构造、生物含量等存在差异,次生改造作用差别也较大,进而造成储层孔隙结构和物性差别较大,而这些因素形成的物理性质差异可在各种测井上出现差别响应。为此,根据已形成的随井深沉积环境变化而引起岩石物理变化的连续电相剖面,再通过数理统计聚类分析建立起测井岩相的数学模型,最后根据误差判断将电相剖面转化为测井岩相剖面,从而达到利用测井信息定型识别岩相的目的。该方法建立的测井相和岩相关系模型,具有应用参数多、岩相细分、定量化程度高等特点,能较好地识别出碳酸岩复杂的岩相,识别结果与取芯剖面对比,精度达到87％,说明该方法是可行的。     

井震结合技术进行沉积相及沉积微相划分

运用井震结合技术进行沉积相沉积微相划分。根据不同的测井方法所能呈现岩石的岩性、物性、流体性质上探测能力的差别,地层在不同的测井组合曲线上的差异,对测井相进行分析。选取合适的测井方法进行组合,得出砂体沉积规律,结合地震多参数属性分析,通过水动力和物源供应的变化,进行沉积相、沉积微相划分。     

HQ油田东部长6储层岩性研究

本文采用HQ油田东部地区部分关键井测井、地质、岩心资料,进行资料整理和综合分析,利用自然电位测井和自然伽马测井方法研究长6储层中岩性变化,有效地反映出该区特低渗透储层不同岩石物理相形成的地质特征及其分布规律。     

有约束岩性剖面测井识别技术

传统的测井曲线能够科学的反映出岩层中岩石的颗粒大小粗细情况以及岩石中的颗粒成分。如果能够对单井所在岩层的沉积情况有足够的认识,会对减少通过测井资料来认识岩性的多解性有很大的帮助。在地形分布上有的盆地有凹陷地带,形成的大多是多物源沉积环境,岩层沉积状况也以砂岩、砾岩等混杂沉积状况,所以能够基本认定为砾岩岩性剖面为粗颗粒沉积序列,其余为细颗粒沉积序列。根据实践中对一定数量的探井岩性资料进行分析能够认定粗颗粒沉积区和细颗粒沉积区,以此为基础建立相应的交汇图识别图版具有相当高的相似性。经过验证该方法对解决连续岩性剖面对过渡岩层测井信息反映不充分的问题。     

自然伽马能谱在NDx井的应用

自然伽马能谱测井能把自然放射性中的铀、钍、钾同位素有效地区分开来,利用U、TH、K三条分量曲线较好的解决了NDx井岩性识别、计算地层中的泥质含量、识别高自然伽马放射性储层、定性分析地层沉积环境、评价生油岩的问题。     

潜山岩石类型与测井响应关系研究

潜山油藏采用录井资料识别储层岩性难度比较大,并且具有一定的片面性。因此,本次研究利用测井曲线特征定性识别岩性,而后采用"岩芯刻度测井"的方法定量识别岩性。建立了不同岩石的识别标准,实现了定性定量识别储层岩性,有效指导潜山油藏地质特征研究,为油藏高效开发奠定基础。     

PREDICTION OF PRESSURE BUILD UP IN A MICRO CAPILLARY DUE TO PARTICLE RETENTION

A single capillary model is proposed to predict the increase in pressure drop due to the particle deposition. The model is based on mass balance and trajectory analysis considering physical force (London—Van der Waals), hydrodynamic force (gravity and drag) and electrokinetic force (double layer). The validity of the model was tested experimentally by simulating a micro-capillary of radius 34.37 μm and circulating bentonite suspension at different flow rates and concentrations. The model is valid for predicting the pressure build up due to smooth deposition of particles with minimal surface energy.     

Importance of the density gradient effects in modelling electro deposition process at a rotating cylinder electrode

The rotating cylinder electrode configuration is one of the most used electrochemical configurations for electrochemical processes study. It is often used with turbulent flow regime for industrial application such as intensive corrosion or electro deposition processes. It can also be used for laminar regimes but in this case it can appear superposition between forced convection and natural free convection. This natural free convection is generally due to density gradient from electrode to bulk, due to electro deposition or to evolving bubbles. The hydrodynamic regime is then said mixed.There is few knowledge concerning the mixed hydrodynamic and the main goal of the present work is to show the qualitative and quantitative effects and differences between purely forced convective flow and purely free natural flow.     

Natural organic matter fouling due to foulant–membrane physicochemical interactions

An extended DLVO (XDLVO) force analysis was introduced to predict natural organic matter (NOM) fouling in ultrafiltration (UF) membrane processes. Ultrafiltration membrane fouling experiments were performed using two NOM extracts from real waters and two commercial polymeric UF membranes. The hydrodynamic force by permeation drag and three interfacial forces of XDLVO (van der Waals, electrostatic, acid–base energy) were used for the force analysis. Acid–base interaction forces between NOM and UF membranes were dominant in short range (separation distances < 5 nm) and appear to determine the potential of NOM deposition. Relative extents of flux decline were successfully predicted using the short-range force analyses.     

微纳米颗粒受自然对流影响运动沉积特性

引言固体颗粒在流体内的运动及沉积是大气环境、河床、水文地质等自然界中普遍存在的现象,也在煤燃烧、化工制药、建筑、冶金等许多工业领域中广泛存在,因此,很早就受到关注[1-3]。一般情况下,对不同颗粒度的颗粒运动与沉积应有不同的研究方法,如微纳米颗粒可能需要考虑布朗力,而大颗粒可以忽略,大颗粒可能需要考虑颗粒的形态,     

Kinetics of Colloidal Particle Deposition to a Solid Surface from Pressure Driven Microchannel Flows

Kinetics of colloidal particles deposition onto a solid surface in hydrodynamic flows was studied. A phenomenological mathematical model was presented to analyze the particle deposition from pressure‐driven flows in a parallel‐plate microchannel. The two‐dimensional mass transport equation incorporating hydrodynamic convection, particle diffusion, gravity force and DLVO colloidal forces (i.e., the van der Waals and electrical double‐layer forces) was solved numerically using a finite difference method to obtain the dimensionless particle deposition rates expressed by the Sherwood number. The numerical predictions of the Sherwood number were compared with the results of videomicroscopic experiments conducted under various physicochemical conditions including electrolyte concentration, particle size and hydrodynamic flow intensity in terms of the Reynolds number, and reasonable good agreement was found.     

Calculation of the current density distribution of submicron copper electroplating based on uneven adsorption of poly(ethylene glycol)

Uneven adsorption of polyethylene glycol (PEG) along a submicron feature enabling the occurrence of void-free deposition has been identified and we have developed a simplified 1-D model to explain the phenomenon based on the distribution of hydrodynamic driving force along the trench depth. We also verified this new model based on the uneven PEG adsorption via an electrochemical quartz crystal microbalance study. The model shows that with only moderate PEG concentration, void-free deposition can be realized. Some parameters used in the modeling were developed from chronopotentiometry and rotating disc electrode experiments.     

Fabrication of textured alumina by orienting template particles during electrophoretic deposition

(0 0 1)-Textured α-alumina has been processed by electrophoretic deposition (EPD) and templated grain growth. The mechanism of platelet template orientation during EPD was examined with respect to the impact of the electric field force, gravity and hydrodynamic force in two different deposition cells with vertically or horizontally positioned deposition electrodes. A sharp (0 0 1) ‘fibre texture’ was obtained after templated grain growth during sintering of a deposit formed from a stirred 5 vol% platelet containing suspension in a vertical deposition cell. The texture was characterized by means of the Lotgering factor, texture index and electron backscattering diffraction (EBSD).     

Analysis of non‐Brownian particle deposition from turbulent liquid‐flow

The deposition of non‐Brownian particles from turbulent liquid‐flow onto channel walls is numerically analyzed. The approach combines Lagrangian particle tracking with a kinematic model of the near‐wall shear layer. For nonbuoyant particles, direct interception is the main deposition mechanism and the deposition velocity scales as the particle diameter (in wall units) to the power of 1.7. When wall/particle hydrodynamic interactions are taken into account, the deposition velocity is significantly reduced and the correction factor scales as the cubic root of the wall roughness to particle diameter ratio. For buoyant particles, sedimentation is usually the predominant deposition mechanism and the hydrodynamic interactions significantly affect the deposition velocity when the drainage characteristic time driven by buoyancy is of the order of the particle residence time close to the wall. Last, a wall‐function for the suspended particles is proposed. © 2015 American Institute of Chemical Engineers AIChE J, 62: 891–904, 2016     

Particle-Substrate Collisions, Particle Rebound and Removal

Recent progress in particle capture and rebound and its effect on the adhesion force is reviewed in this paper. Particles rebound when the incident velocity is greater than a characteristic critical velocity. Lower impaction velocity particles experience elastic and plastic deformation. Recent models for particle rebound and capture are discussed and evaluated in terms of their restrictive assumptions and results. Recent experimental data of particle rebound and capture is also discussed, as is the hydrodynamic removal of captured particles. The removal of particles occurs when the applied hydrodynamic removal force overcomes the adhesion force. The effect of adhesion-induced deformation on the removal of particles is introduced and discussed.     

地下水人工补给过程中流速对多孔介质胶体堵塞的影响机理

通过一系列室内砂柱模拟实验,研究了流速对胶体在饱和多孔介质中滞留-迁移行为的影响;运用COMSOL软件模拟,拟合实验数据后得到表征胶体沉积的关键参数。结果表明：流速增大缩短了胶体在多孔介质中的滞留时间,并增强水动力拖拽力,导致介质对胶体的吸附量减少,有利于胶体的迁移;回灌时间的延续造成的多孔介质渗透系数降低,可通过瞬间增大流速使渗透系数在较短时间内恢复,然而随后形成新的吸附渗透性仍会降低。水源离子强度、介质粗糙度等因素会影响胶体迁移的流速效应。在相同条件下,吸附系数随着离子强度的增大而增加,随着流速的增大而增加。综合来看,离子强度的增加可抵消一部分水动力拖拽力的影响,提高胶体在多孔介质中滞留的概率;介质表面粗糙度的增加,可削弱水动力拖拽力作用,同时增加胶体与介质的吸附、沉积点位和接触面积,导致胶体易于在多孔介质中发生滞留并可能进一步导致介质堵塞。