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鱼卡是柴达木盆地北缘的主要煤田,其地质勘探投入了较大的工程量,其中测井工作发挥了很重要的作用.经研究表明,含煤地层在测井上具有特殊的响应特征,其中煤层表现为低密度、低伽玛和高电阻的特征.此外,根据测井响应特征还可以确定煤层的性质和厚度,符合率达到95%以上,精确确定了含水层的性质和厚度.并在煤层对比,岩体物理性质分析,以及煤层顶、底板板压、强度预测等方面都发挥了重要作用. 相似文献
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在同一地区,各个钻孔的测井资料存在着一定的内在联系,不同的岩性,在各种测井参数曲线上有不同的响应特征.在高陂矿区,根据高放射性可以确定16#及18#煤层顶板的主要标志层为砂质泥岩;利用多孔参数曲线对比,可以确定各煤层位,厚度变化及断层性质. 相似文献
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煤层层滑构造会引发煤层性质变化,进而影响煤矿安全开采。为此基于层滑构造发育的地质特征,应用反射波运动学以及动力学研究方法,对煤矿已揭露地质信息与地震剖面进行对比,研究煤层层滑构造的地震响应特征。通过分析层滑构造在不同地震属性下弹性波运动学及动力学特征及其变化规律,确立不同地震信息响应特征与层滑构造之间的关系。基于层滑构造所引发的煤层变化及地震响应变化规律,利用多信息融合技术解释区域内煤层厚度变化规律、划分构造煤发育带,进而圈定层滑构造区域。 相似文献
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利用煤层反射波的初至特征、相位特征、振幅特征、频率特征和波组特征的变化,可以解释煤层缺失,分析煤层沉积环境,对比煤层分叉,确定构造断裂和预测煤层厚度变化趋势等。 相似文献
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结合地质成果,在黔北聚煤区开展综合数字测井技术的基础上,选择3种以上测井参数：视电阻率、自然放射性、人工放射性或其它物性参数,利用其对煤层、常见岩石、标志层、地质界线等的曲线响应特征,作出相应的定性解释,并以此确定煤层的深度、厚度和结构,从而对钻探工程打薄或打丢煤层（线）进行更正,为原始数据研究提供相关信息。 相似文献
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《中国煤炭地质》2015,(8)
煤层回采后覆岩破坏特征与煤层开采方法及覆岩性质相关,覆岩破坏特征主要指导水裂缝带发育高度及其形态,是顶板水害防治的关键技术参数。在分析矿井水文地质条件的基础上,采用钻孔冲洗液漏失量观测、数值模拟与经验公式3种方法综合确定了敏东一矿软弱覆岩综放开采条件下导水裂缝带发育高度,结果表明:综放开采厚度为7.7 m时,导水裂缝带发育高度为80 m。研究成果填补了我国北方大雁、扎赉诺尔、伊敏河等矿区的研究空白。通过对南一采区东西翼水文地质条件的对比分析,发现西翼水文地质条件较为复杂,提出以加强煤层顶板探放水与控制煤层开采厚度为主的防治水技术方法,并计算出工作面不同范围内的煤层开采厚度。 相似文献
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以多煤层区采掘资料为依据，通过对不同煤层间小断层特征的比较研究，论证了煤岩层岩性、厚度及组合在煤层小断层发育中的作用，提出了“岩层力学性质”的概念，对多煤层开采矿井中小断层的研究和预测有一定的指导意义。 相似文献
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对于地震勘探的频率范围而言,煤层往往可视为薄层,而煤层厚度的预测是煤田勘探和开发时至关重要的一步,这一问题至今已有许多振幅统计方面的解决办法。在本文中,我们通过薄层的地震波响应,找出了薄层及其厚度在复数域中的预测方法。并得出结论,薄互层及薄层厚度的变化对地震波的瞬时振幅、瞬时相位及瞬时频率都有直接影响,通过地震记录的复数道分析,可以预测煤层厚度的横向变化,并可以利用薄层及薄互层的地震波响应规律来反演煤层厚度。 相似文献
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The Upper Cretaceous Qingshankou Formation (K2qn) and Nenjiang Formation (K2n) in the Songliao Basin (SLB), China, contain discrete ostracod-bearing deposits. The ostracod-bearing layers range in thickness from 5 to 380 cm. Based on integrated analysis of seismic, drilling, core and logging data, the sedimentary characteristics, distribution patterns and hydrocarbon implications of the ostracod-bearing beds have been studied. Compared with mudstone and sandstone in lacustrine settings, ostracod-bearing beds have distinctive characteristics in terms of seismic response and logging features. Three types of depositional pattern of ostracod-bearing beds are recognised in different facies: mixed siliciclastic–ostracod deposits in the delta front, sheeted ostracod deposits, and dotted ostracod deposits in shallow or semi-deep lacustrine settings. In plan view, ostracod-bearing beds mainly occur in the Daqing area, the Longhupao–Honggang terraces and the Heidimiao depression, and are relatively less developed in the east of the SLB. Shallow and semi-deep lacustrine settings were favourable environments for the survival of ostracods. In the stratigraphic succession, ostracod-bearing beds mainly occur in the upper K2qn1, K2qn2, lower K2qn3 and K2n1 units. High-frequency sequence cycles controlled ostracod reproduction and death, and mass mortalities of ostracods commonly occurred during periods in which the lake base-level fell, leading to water shallowing, increasing salinity and sand intrusion into the shore-shallow lakes. Ostracod mortality was not associated with expansion of the lake area, marine transgression or volcanic eruptions. The ostracod-bearing beds were widely formed in shallow and semi-deep lacustrine settings in the SLB. Tight oil/gas reservoirs can be developed in thick ostracod-bearing beds. In addition, areas containing ostracod can be regarded as sweet spots for mud or shale oil/gas exploration, because extensive ostracods can improve the content of brittle minerals in mudstone. 相似文献
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贵州省金沙煤田龙潭组岩煤层测井对比方法 总被引：2，自引：0，他引：2
龙潭组是金沙井田的主要含煤地层，含煤达12~15层，其中7、8、9、11、12五层煤较稳定，为主要可采煤层。根据测井物性曲线与地质岩心的对比分析，总结出该组煤岩层的共有测井物性规律：低密度、中低电阻率、较高中子孔隙度和较低的纵波速度，以及其特有规律如：5、6、7、8、9煤层的低自然伽马，11、12煤层较高的自然伽马等特征。结合煤层测井曲线形态特征及其与顶、底板以及和煤层上、下标志层间组合关系，进行了全煤系地层的对比，揭示了该井田煤层的分岔、合并、冲刷、沉缺、煤层厚度等变化规律。 相似文献
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断层在地质剖面上的表现是使地层厚度和层间距发生变化,通常情况下受正断层的影响会使地层缺失,从而导致地层的层间距（或厚度）减小;而受逆断层的影响则会造成地层重复,使层间距（或厚度）变大。因此通过研究相邻钻孔之间测片曲线存横向和纵向的形态变化规律,根据标志层的缺失与重复进而对断层位置、性质、断距大小作出准确判断。而确定断层存在的关键是要找准标志层,标志层的准确性代表了成果的可靠性。实例表明,利用常规测井曲线如视电阻率、散射伽马伽马和自然伽马曲线在煤、岩层对比中的响应规律,可识别出反映局部地段地层的沉积规律及特征,并依据其特殊标志准确的划定断层性质。 相似文献
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测井方法在青海木里煤田冻土研究中的应用 总被引：1，自引：0，他引：1
研究表明冻土的电阻率为非冻土的3倍,常规测井参数可用于冻土层的综合解释,而井温曲线的＂U＂字型与＂L＂字型不但可以划分不同性质的冻土层,而且能够准确的解释其冻土厚度。通过分析聚乎更、江仓、热水三个矿区的30个测温孔,发现其井田北部和南部区域,多年冻土层均有增厚的趋势,底界从北到南逐渐加深。对江仓矿区的长期观测及矿井开拓,验证了多年冻土层的总体变化范围与所获测井成果基本一致。根据对木里煤田冻土的研究,发现测井解释的多年冻土层厚度一般小于其真厚度,而季节性冻土层的解释厚度要大于其真实厚度。 相似文献
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本文根据硅藻土的物性特征,对先锋褐煤盆地大量的测井及取心化验资料做了分析,确立了硅藻土品位划分方法和测井曲线对比标志,在应用测井曲线进行矿局定性、定厚、划分品位、进行层位对比及含砂、含粘土量的分析上取得了一定效果。 相似文献
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The quantitative relationships between lithological variables of Early Permian Barakar coal measures of western Singrauli Gondwana sub-basin are investigated using principal component analysis in an attempt to reveal simple relationships undetected by conventional quantitative methods. The results not only confirm and amplify those of the simple regression analysis described in Casshyap et.al. (1988), but are also interpreted in terms of evolution of coal swamps. If the total thickness of strata, total thickness of clastic sediments, total thickness of coal seams, number of sandstone beds, number of shale beds, number of coal seams and clastic ratio are considered, the first three components accounts for 80% of the total variance and the lithological variables generally fall into two groups. One group contains the first four variables, namely, total thickness of strata, total thickness of sandstone, total thickness of shale and total thickness of coal seams, all of which have basin-like regional patterns of sedimentation linked to net subsidence. The other group of variables, which are somewhat less closely related to net subsidence such as number of sandstone beds, number of shale beds and number of coal seam. The sand/shale ratio and clastic ratio are dependent on the other variables and seem to be unrelated to net subsidence. The principal component results, at best in geological term, may be explained by the to and fro lateral migration of a river channel across its flood plain coupled with a gradual isostatic adjustment of the basin floor in response to the weight of the sediments and differential subsidence through space and time. 相似文献
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Logging Evaluation of the Ordovician Carbonate Reservoir Beds in the Lungudong Region,Tarim Basin 总被引：3，自引：0，他引：3
YANG Wenjing XIAO Chengwen LIU Luofu QI Guangzhong JIANG Zhenxue YUAN Yunchun WANG Weili YANG Song 《《地质学报》英文版》2010,84(5):1141-1156
<正>In recent years,great progress has been made constantly in oil and gas exploration in the Lungudong region of the Tarim Basin.However,progress has been slow in the evaluation of its main oil-producing horizons-the Ordovician carbonate reservoir beds.Based on previous researches and on the various data such as drilling,geology and oil test,in combination with the interpretation of each single-well imaging and conventional logging data,and through analysis and comparison,the identification methods in imaging and conventional logging for four types of carbonate reservoir beds in this region are summarized in this paper.Calculation formulas for four reservoir bed parameters,i. e.shale content,porosity,permeability and oil saturation in this region are proposed;and reservoir beds in this region are divided into three levels(Ⅰ,ⅡandⅢ) by combining oil test data and logging data,The lower limits of the effective porosity of reservoir beds and the fracture porosity of effective reservoir beds are determined as 1.8%and 0.04%,respectively.The physical property parameters are calculated by conventional logging curves,and the most advantageous areas for reservoir development are predicted comprehensively.On the plane,the high-value zones of reservoir bed parameters are mainly concentrated in the N-S-trending strike-slip fault,the Sangtamu fault horst zone and near the LG38 well area;vertically,the reservoir bed parameters of the Yijianfang Formation are better than those of the Yingshan and Lianglitage formations. 相似文献
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应用人工神经网络解释煤层厚度 总被引：2，自引：0，他引：2
本文介绍了人工神经网络解释煤层厚度的方法，为直接利用煤田地震资料确定煤层厚度提供了一种新的途径。利用煤层厚度与煤层反射波动力学特征参数之间的非线性关系，用人工神经网络进行定量描述，便可根据地震资料求出煤层厚度。 相似文献