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The main goal of this paper is to design and develop a new technique and software tool that help automatic lithofacies segmentation from well logs data. Lithofacies is a crucial problem in reservoir characterization and our study intends to prove that techniques like wavelet transform modulus maxima lines (WTMM) and detrended fluctuation analysis (DFA) approaches allow geological lithology segmentation from well logs data. On the one hand, WTMM prove to be useful for delimitation of each layer. We based on its sensitivity on the presence of more than one texture. On the other hand, DFA is used to enhance the estimation of the roughness coefficient of each facies. We have used them jointly to segment the lithofacies of boreholes located in the Algerian Sahara. Obtained results are encouraging to publish this method because the principal benefit is economic. 相似文献
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通过岩心观察、常规测井和成像测井等资料,对库车坳陷大北克深地区白垩系巴什基奇克组辫状河三角洲沉积储层特征进行了精细研究。结果表明辫状河三角洲前缘发育的水下分流河道、河口坝等构成了主要的骨架砂体类型。通过岩心刻度测井建立了一套较完整的岩性和沉积构造识别模式。在此基础上建立了不同沉积微相的测井识别与划分标准,并探讨了不同沉积微相对储层物性的控制。然后根据粒度中值和成分成熟度指数将沉积微相进一步细分为水下分流河道中砂岩、水下分流河道细砂岩等不同的岩性岩相类型,并分别建立了粒度中值和成分成熟度指数的测井评价模型。在此基础上以成像测井为主,辅以常规测井和岩心资料及粒度参数和成分成熟度指数,实现单井连续的岩性岩相识别与划分。研究成果可为后续沉积储层精细评价乃至天然气勘探开发综合研究奠定基础。 相似文献
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Electrical borehole image logs yield high-resolution information about variations in micro-resistivity along the borehole wall. To interpret these variations in terms of sedimentary structures and lithofacies types, calibration with real rock is needed. Normally, the only real rock available is core, and this only provides one-dimensional information. In this paper, the interpretation of fluvial facies types from borehole image logs was established by direct comparison with outcrops. Four fluvial facies associations were established in an outcrop study of a low net-to-gross fluvial succession: (i) meandering rivers, (ii) braided rivers, (iii) crevasse deltas, and (iv) crevasse splays. The lithofacies characteristics and palaeocurrent distributions of each fluvial facies association were established. Two 200 m deep wells were drilled behind the cliff face outcrops. One well was cored to a depth of 150 m and borehole image logs were recorded in both wells. The wells were correlated with the outcrop. The borehole image logs were analysed by their vertical colour succession and the dipmeter pattern. Image log facies were established, and these were interpreted in terms of the fluvial facies associations encountered in the corresponding outcrops. The study of borehole image logs yields a set of diagnostic criteria for a detailed fluvial facies interpretation and the establishment of depositional trends, and thus provides a powerful tool for the direct interpretation of fluvial facies in a reservoir setting. 相似文献
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The main goal of this paper is to identify heterogeneities from well logs data using the wavelet-based multifractal analysis. Firstly, the wavelet transform modulus maxima lines method is applied with a moving window of 128 samples to the raw well logs data. After that, the generalized fractal dimensions that correspond to the three first moments of the function of partition are estimated. Application to synthetic and real well logs data of the main and pilot Kontinentales Tiefbohrprogramm de Bundesreplik Deutschland wells shows that the information and the correlation dimensions can be used for heterogeneities analysis and lithofacies segmentation form well logs data. 相似文献
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R. Thilagavathi S. Chidambaram M. V. Prasanna S. Pethaperumal 《Arabian Journal of Geosciences》2014,7(9):3715-3729
Geophysical logs provide a strong mechanism for interpretation and determination of the depositional environments, facies and also help in interpretations of hydrogeologic units. Spontaneous potential (SP) and resistivity logs can be used as an indicator of textural parameters. Pondicherry region has a complicated geology and with formation of different ages. The boreholes (BH) of this region are examined for litholog, SP and resistivity from four different BH locations, viz, Ariyankuppam, Chinnaverampattinam, Thavalakuppam and Nallavadu. These locations were studied and interpreted by using the shapes of the curves to identify the depositional environments, and this was later compared with the vertical litholog profile. Comparing the variation of these logs, the lateral variation of sedimentary facies was also attempted. The average resistivity values of Ariyankuppam, Chinnaverampattinam, Thavalakuppam and Nallavadu are 42.4, 30.4, 50.4 and 28.3?Ωm, respectively. Majority of the resistivity values corresponds from fine- to medium-grained sand, clayey pebbles, fine to very coarse sand and clayey sand with lignite. Frequency of resistivity values in each BH were identified for determining the dominant representative grain size. The study has pointed out the lithological variation of the system laterally and vertically using geophysical well logs. 相似文献
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准噶尔盆地阜东斜坡区侏罗系测井沉积相研究 总被引：4，自引：4，他引：4
本文就准噶尔盆地阜东斜坡区侏罗系测井沉积相研究进行了探讨。主要应用常规测井资料、地层倾角测井资料及成像测井资料为核心的测井相序列去分析和判断沉积类型以及沉积相。经过ANN岩相处理，看出典型的三角洲沉积岩相序列自下而上依次为三角洲前缘远砂坝、河口砂坝、分流间湾、水下分流河道、分之河道及分之河道间，将其结果与录井剖面对比，符合率非常高，为区域上关键井的相序分析及沉积体系分析提供了连续的较准确的岩相依据。通过古水流系统的确定，看出研究区侏罗系八道湾组-三工河组沉积时期的物源主要来自北部克拉美丽山以北地区。南部北三台地区以南存在次要物源。最后综合利用常规测井处理解释的岩性剖面、岩心刻度下处理出来的沉积学倾角解释成果（沉积构造和古水流）和ANN岩相处理解释成果，建立起了阜东斜坡区关键井目的层段的测井沉积亚、微相模型。 相似文献
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KELD RØMER RASMUSSEN WERNER BAI 《Boreas: An International Journal of Quaternary Research》1987,16(4):393-404
During a search for unpolluted resources, new wells have been drilled to a deep confined aquifer in central Jutland. Since little is known about the extent and vulnerability of the deep reservoir, geophysical logging was used to supplement hydraulic well-testing. Gamma-ray, SP and resistivity logs were recorded in the boreholes. Gamma-logs were also recorded in two cased wells. Analysis of the logs, combined with information from samples, shows an unconfined aquifer of quartz and mica sand to a depth of about 55 m at Grindsted. Below this level there is a 40 m thick aquitard with an apparent southerly dip. The aquitard is composed of interbedded sand, silt and clay. The deep confined aquifer extends from 95 to 110 m below the surface at Grindsted. Both the aquitard and the deep aquifer are provisionally dated as Early/Middle Miocene. The electrical logs discriminate well between sand, silt and clay beds. If a suitable mud is used in the well it is possible to calculate the formation water resistivities in good agreement with water samples obtained after completion. From the resistivity logs formation factors were calculated in the range 3–5 using no-invasion departure curves. The high content of heavy mineralsin the Tertiary deposits makes it impossible to obtain precise lithological information from the gamma-ray log. On the other hand this log provides clear markers for identifying the hydrogeological units in the well-bores. 相似文献
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本文叙述了在辽宁阜新煤盆地艾友矿区,利用视电阻率、自然伽玛、伽玛—伽玛测井曲线分析沉积环境的成果,着重总结了冲积扇、扇三角洲、湖泊以及河流等环境的测井曲线特征。在此基础上,根据该区100多个钻孔的测井曲线,作出了艾友矿区沙三段地层的含砂率等值线图和煤层等厚图。通过分析这些成果图件得出了该矿区聚煤带和富煤带的分布规律。这些研究成果对于煤田的预测和勘探具有普遍意义。 相似文献
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A technique akin to Galton’s composite portraiture is suggested for creating a generalized image of a stratigraphic unit based on well log data from a group of well sections. The procedure begins with superimposing stratigraphically equivalent section points according to pairwise correlation models followed by weighted summation of similar logs. The superimposition highlights persistent common features of the sections, while their minor individual details become suppressed. A generalized model of the Bazhenov Formation in the Salym area has been constructed from gamma-ray, apparent resistivity, and self-potential logs. Radioactivity and resistivity anomalies, which are often used as constraints on the Bazhenov Formation boundaries, show a significant spatial discrepancy. According to the correlation, the formation volume in each well depends on the depth interval corresponding to the hypostratotype. The results were used to map the Bazhenov Formation thickness and its standard deviation, as well as average values of different logs. 相似文献
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Guo Jianhu Zeng Yunfu Zhai Yonghong Gao Zhenzhong Jianghan Petroleum Institute Jingsh Hubei Chengdu Institute of Technology Chengdu Sichuan Jianghan Petroleum Institute Jingsh Hubei Liu Xinzhu 《《地质学报》英文版》1997,71(3):328-343
The Carboniferous prototype sedimentary basin in the Tazhong (Central Tarimbasin) area is recognized as a compressive intracratonic depressional one. Three type Ⅰ sequenceboundaries and three type Ⅱ sequence boundaries can be identified in the CarboniferousSystem, which can accordingly be divided into five sedimentary sequences. These sequencespossess stratigraphic characters of the standard sequence and correspond to the depositionalstratigraphic unit of a third-order eustatic cycle. They can be regionally or globally correlatedwith each other. The framework of sequence stratigraphy of the intracratonict basin in thestudy area distinctly differs from that of the passive continental-margin basin in the lack ofdepositional systems of early-middle lowstand, poor development of the deeply incised valleyand condensed section of the maximum sea-flood, good development of type Ⅱ sequenceboundaries and coastal plain depositional systems coexisting with shelf-type fan deltas underwet climatic conditions, Which consequently led to the formation of a paralic lithofacies frame-work. 相似文献
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准噶尔盆地吉木萨尔凹陷二叠系芦草沟组岩性复杂,岩相多样,亟需建立配套的岩相测井识别方法。综合利用岩心薄片、常规测井与成像测井等资料对芦草沟组的岩性、沉积构造等特征进行研究,在此基础上进行岩相类型划分,并分析不同岩相的测井响应特征,建立岩相测井评价模型。结果表明,研究区主要由云质泥岩、泥质粉砂岩、粉砂质泥岩等岩性组成;根据岩心的矿物组成,考虑在岩心尺度上的可区分性、测井中的可识别性,划分出块状白云质泥岩相、平行/波状层理泥质粉砂岩相、块状泥岩相、块状泥晶白云岩相、平行层理粉砂岩相和波状/水平层理粉砂质泥岩相6种主要岩相类型。在此基础上通过岩心刻度测井资料建立岩相判别准则,并利用Kohonen神经网络方法实现单井岩相测井自动判别,划分结果与薄片匹配较好。研究成果可提高未取心井的岩相识别效率与精度,为该地区页岩油勘探提供一定的理论依据与方法支撑。 相似文献
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针对新疆某工区强非均质性岩溶缝洞型碳酸盐岩储层,提出了一种基于地震多属性优化与电成像测井信息融合的碳酸盐岩储层缝洞带识别评价与钻井轨迹优化设计方法。首先,利用相干体、蚂蚁体等多种地震属性与张量约束的稀疏脉冲反演结果综合实现缝洞发育带空间分布预测与雕刻,确定可能油气圈闭的分布范围;然后,基于数学形态学滤波方法,由电成像测井资料自动拾取井壁的裂缝和溶蚀孔洞分布,统计井壁裂缝倾向和倾角;再次,用工区内钻孔多臂井径资料计算的井筒崩落信息与电成像资料拾取的诱导缝信息预测工区的最大和最小主应力方向;最后,融合地震属性与电成像测井信息评价的缝洞分布结果,预测工区内走滑断裂带的最大主应力方向以NE—SW为主,局部为NW—SE,且以中高角度为主的裂缝走向与主应力近乎平行。采用预测主应力分布方法实现了沿NW—SE方向的大斜度井与水平井优化设计,钻遇了大规模优质储集体,获得了稳定油流,并以此为基础在周围打井若干口,极大地降低了深层勘探的钻井风险。 相似文献
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B. Obara 《Mineralogy and Petrology》2007,91(3-4):271-285
Summary The present paper is concerned with the development and application of an effective automatic algorithm of image analysis
in order to detect grain boundaries on microscope images of Redziny dolostone and Wisniowka quartzite. The algorithm utilises
sets of 6 colour images for each measurement field on thin sections, which are recorded using an optical polarizing microscope
in different polarization set-ups.
The proposed method is based on an image pre-processing procedure that is focused on colour system transformation, followed
by rock grain boundaries segmentation using the image analysis methods for each colour image. For the image pre-processing
procedure, several colour system transformations were selected and compared. By using the alternative colour systems that
concentrate on colour information we are able to minimise the effects of internal micro-structures in the grain boundaries
segmentation procedure. The grain boundary maps obtained confirm that the use of an approximately perceptually uniform colour
system as an image pre-processing procedure can significantly improve the rock grain segmentation. This newly-developed method
may facilitate petrographical and stereological studies of rock structures. 相似文献
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塔里木盆地麦盖提斜坡西段石炭系生屑灰岩段旋回划分及意义 总被引：2，自引：0，他引：2
从露头剖面及钻井岩芯、电性特征入手,结合区域地质背景认为:麦盖提斜坡西段石炭系生屑灰岩段横向展布相对稳定,夹在上下两套泥岩(或膏质泥岩)之间,呈连续沉积过渡,电测曲线为低伽玛值、高电阻率值,形态总体呈箱形。生屑灰岩段在岩性、电性特征上均具明显的成段性,自下而上具有四次旋回性(相当于五级层序)。Ⅰ旋回层主要为灰质云岩夹膏质灰岩、泥质云岩,电阻率、自然伽玛曲线呈漏斗型,与下伏及上覆地层均呈突变过渡;Ⅱ旋回层主要为含泥灰岩、泥晶灰岩,自然伽玛、电阻率曲线均呈鼓型、箱型特征,与上覆地层呈突变过渡,电阻率曲线幅值相对较高;Ⅲ旋回层主要为泥晶灰岩、泥质灰岩、云质灰岩夹生屑灰岩,电阻率、自然伽玛曲线呈低幅度锯齿型,自然伽玛幅度相对较高,电阻率幅值相对较低,与上覆地层均呈渐变过渡;Ⅳ旋回层以白云岩、灰质云岩为主,电阻率及自然伽玛曲线呈复合钟型特征,与上覆地层均呈突变接触。地层精细划分对比有助于更好地认清生屑灰岩段在纵横向的变化规律,进一步突出有利储集区(琼002—群6井)及有利储集层段(Ⅳ旋回层),为下一步的勘探夯实理论基础。 相似文献
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Khurshed Akhtar 《Sedimentary Geology》1976,16(4):299-318
Special interest is attached to the Bhander Limestone because it is the only calcareous formation in the very thick elastic sequence of Precambrian age, designated informally as the “Upper” Vindhyan. The sedimentology of the Bhander Limestone was studied in the Mandalgarh-Singoli area of southeastern Rajasthan and adjoining Madhya Pradesh with a view to interpreting the depositional environments of the formation. This study has an important bearing on the exploration for oil in India and presents one of the few examples of Precambrian limestones of which thorough modern sedimentological analysis has been made.The Bhander Limestone comprises micritic limestones, crystalline dolostones, siltstones and shales that show desiccation structures (horizontal fenestrae, bird's-eye structures, mud cracks), very shallow small channels filled with flat-pebble breccia, algal lamination, palisade structure, and occasional ripple marks, ripple lamination and micro-cross-lamination. The major petrographic constituents are micrite, intraclasts, sparry-calcite cement, pseudospar and replacement dolomite. Seven environmentally significant microfacies have been recognized: micrite, silty micrite, graded micrite, dolomitized micrite, neomorphosed micrite, intrasparrudite and intramicrudite.The Bhander Limestone Formation has been divided vertically into four lithofacies: red argillaceous micritic limestones (lithofacies A), interlaminated blue micritic limestones and red dolomite (lithofacies B), olive calcareous shales (lithofacies C), and black micritic limestones (lithofacies D). Each lithofacies is characterized by certain megascopic sedimentary features and microfacies. The various lithofacies have been interpreted as representing deposition in the different subenvironments of a generally low-energy, marginal marine environment comprising tidal flats and lagoons. The vertical changes from one lithofacies to another are interpreted as reflecting the change from one subenvironment to another brought about by the landward shifting of the boundaries of these subenvironments in response to a transgression. 相似文献
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裂缝性碳酸盐岩裂缝的双侧向测井响应特征及解释方法 总被引：11，自引：0，他引：11
裂缝评价是裂缝性碳酸盐岩储层评价的关键, 其常规评价方法受到裂缝发育的不均匀性及储层各向异性的影响而存在诸多困难.采用三维数值算法, 利用宏观各向异性地层模型, 研究不同的裂缝参数条件下双侧向测井响应特征, 由此导出一种用于裂缝孔隙度计算的快速算法.分析表明, 裂缝的双侧向响应同裂缝孔隙度与孔隙流体电导率之间存在明显的线性关系, 裂缝的倾角造成双侧向测井曲线幅度差异的变化; 不同倾斜情况下, 将双侧向测井响应近似表示为岩石基岩电阻率、裂缝孔隙度、裂缝流体电导率的函数, 用于裂缝孔隙度的快速计算.实际资料处理表明, 利用双侧向依据该方法确定的裂缝参数同成像测井资料具有良好的对应性. 相似文献