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1.
当储层与围岩波阻抗差异不明显或储层较薄时,利用常规波阻抗反演往往难以达到储层预测的效果。针对这一问题,通过结合泌阳凹陷M区块实际地质特点,根据区内三维地震资料、测井资料及钻井资料等,利用自然电位曲线和自然伽玛曲线,重构对储层反映敏感的泥质含量曲线。利用泥质含量曲线进行测井约束地震波阻抗反演,有效提高了反演剖面的分辨率,增强了储层砂体预测的准确性。经实际钻井及测井资料证明,该技术在研究区储层预测中取得了良好的效果。 相似文献
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准噶尔盆地玛湖西斜坡区三叠系百口泉组储层为扇三角洲致密砂砾岩,具有低孔、低渗、储层薄的特征,水下中等孔隙度的灰绿色砂砾岩为优质储层。由于地震资料主频低(25~30 Hz),储层薄(10 m左右),而且优质储层与致密层阻抗叠置,目前常用的叠后波阻抗反演、叠前同时反演等方法都满足不了该地区优质薄储层预测的要求。笔者基于取芯、测井、试油等资料开展岩石物理分析,利用纵波阻抗和纵横波速度比建立岩石物理图版,确定该区的优质储层参数特征。在此基础上,开展叠前地质统计学反演,综合叠前同时反演与地质统计学反演技术的优点,实现砂砾岩优质薄储层的预测。反演结果表明,叠前地质统计学反演结果可以明显提高储层纵向预测的分辨率,较好地解决该地区致密砂砾岩优质薄储层预测的问题,为该区下步勘探开发提供依据。 相似文献
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砂岩储层含气后地震波阻抗会显著降低,因此阻抗反演是对含气砂岩储层进行预测的常用方法。但砂岩储层的波阻抗值不仅取决于含流体性质,还与岩石的孔隙度、矿物结构组分等多种因素有关,即使砂岩储层含气,其波阻抗也可能高于高孔含水砂岩,因此,叠后地震阻抗反演结果在含气砂岩储层预测中存在较强的多解性。由于利用了含气砂岩的AVO异常特性,叠前弹性阻抗在含气砂岩储层预测中比叠后地震阻抗具有更高的可靠性。为了提高弹性反演结果的精度,将基追踪反演(basis pursuit inversion,BPI)算法引入叠前弹性阻抗反演。该方法是将地震信号投影到奇、偶子波库上,通过投影值求得每道的相对反射系数,然后进行道积分得到相对弹性波阻抗。相比于传统的稀疏脉冲反演(sparse spike inversion,SSI)算法,基追踪弹性反演算法不需要建立初始低频模型,可显著提高薄层分辨能力和反演精度。通过合成信号的试算和实际地震数据的反演表明,基追踪叠前弹性反演可有效地对砂岩储层的含气异常进行检测,并且相比于传统SSI算法具有更高的反演精度。 相似文献
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综合利用测井、地震、地质资料,以多口井岩石物理分析为基础,结合地震解释层位,通过对测井曲线储层岩石参数的分析解释,建立油藏模型,进行弹性波动方程正演模拟,并综合分析储层与油气地球物理响应特征,快速进行有色反演,其结果不仅可以对地震解释成果进行验证,而且可以对基于地震的波阻抗反演结果进行比较.本方法在苏家屯地区的应用得到较好的效果. 相似文献
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以哈萨克斯坦南图尔盖盆地岩性油气藏研究为例,倾角导向体约束下的储层预测技术为核心,结合研究区岩性油气藏的特点,应用地震资料开展倾角导向体处理和全三维层序地层解释,通过双域地层切片分析、储层反演等方法,完成了目的层储层预测工作。在研究中将倾角导向体约束下的等时低频模型引入到地震波阻抗反演中,用层序界面来约束井间波阻抗的内插外推,据此完成的反演结果能够较好地反映研究区侏罗系三套目标砂体的退覆上超特征。研究表明,倾角导向体约束下的储层预测技术,明显地提高了砂体的辨识度,预测结果能更加清晰地刻画出目标砂体的空间展布特征。 相似文献
6.
测井曲线重构技术在储层反演中的应用 总被引:2,自引:0,他引:2
波阻抗反演是储层预测的一种重要手段,但是当储层与非储层(围岩)波阻抗差异不明显时,利用常规波阻抗反演技术难以较好地识别储层。而测井曲线重构技术可以有效提高岩性识别和储层预测的精度,减少多解性。这里结合川西坳陷须家河组勘探实践,利用GR曲线重构声波反演技术对有利区域进行了预测,有效地提高了反演剖面的分辨率,并在一定程度上提高了岩性解释的准确性和精度。同时,比较了常规波阻抗反演与该方法的区别,取得了良好的效果。 相似文献
7.
针对白马庙构造须家河组须二段在波阻抗反演较难区分泥岩与储层砂岩的情况下,充分利用现有测井资料,运用拟声波技术将声波中含有的地层低频速度信息同对地层的岩性变化很敏感的自然伽玛曲线中的高频信息进行调制成拟合声波曲线,用来进行伽玛反演从而弥补单一声波曲线的不足,以提高地震分辨率,去除泥岩在裂缝和储层预测中的影响,为裂缝预测和储层预测提供基础。 相似文献
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以鄂尔多斯东缘A区块为例,通过岩石物理正演分析,论证了储层岩石物理参数的敏感性,确定利用纵波阻抗与纵横波速度比参数进行储层的识别。在此基础上进行正演模拟,研究了地震的极限分辨率及不同厚度砂体的地震响应特征,确定了运用叠前地质统计学反演为核心的储层预测技术对该研究区太原组进行储层预测研究,以解决该区储层薄、横向变化快、单一岩石物理参数无法区分岩性等问题。地质统计学反演结果表明,该方法能有效的预测厚度大于3 m的储层。对比研究区内11口测井解释厚度与储层反演厚度表明,储层反演预测厚度平均误差为7.5%,其中5口盲井的平均误差为10.2%,一口新钻井的砂体厚度预测误差为1.73%,为该区的井位部署提供了可靠的资料参考。 相似文献
10.
波阻抗反演在气藏描述中的应用 总被引:3,自引:0,他引:3
波阻抗是储集岩的一种重要物性参数,同振幅等反映界面性质的参数相比,具有低的多解性和更高的储层横向预测精度,运用测井约束的地震波阻抗反演,可以较准确地获取储层波阻抗参数,再运用井上测井资料,建立砂体解释模型和储层含气性解释模型,可以获得较准确的砂体等厚度图和波阻抗平面分布图,达到储层横向预测的目的。 相似文献
11.
Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引:4,自引:0,他引:4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozach Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献