The ultra-deep marine carbonate formation of The Great Desert,Tarim Basin Area,NW China,hosting great potential reservoirs,is a prospective target for petroleum exploration.However,there are several challenges remain in ultra-deep desert seismic data processing:①Loose structures of near-surface in desert regions can bring severe seismic energy ab-sorption,showing distinct low-frequency characteristics,which will eventually affect the reconstruction of signals;②The differences between interlayer multiple wave and primary wave in travel time and velocity are relatively small in desert area.Therefore,it is much more challenging to identify and suppress interlayer multiple waves;③The relatively low-resolution seismic data in ultra-deep area(depth>7500 m)due to energy absorption and wavelet deformation cannot meet the require-ment of high-precision imaging;④The drastically varying velocity medium under the influence of lithology,primarily consis-ted of Permian igneous rocks and Calcareous limestone,causes excellent difficulties in velocity model building.We attempt to a-chieve high-precision exploration progress in Tarim basin:①We use microlog data to constrain the near-surface model build-ing;②The multiple suppression technology we are applying this paper can provide more accurate pre-stack data;③We adopt near-surface Q filtering and migration for high-frequency compensation to improve the seismic resolution;④We build the in-itial velocity model based on VSP data,update the initial velocity model with tomography,finally obtain high-precision ima-ging of ultra-deep carbonate.

PreviousNext No AccessSEG 2019 Workshop: 2nd SEG Foothill Exploration Workshop, Chengdu, China, 12–14 April 2019Application of TTI Anisotropy Pre-stack Depth Migration in Foreland Area-Take the Kuqa area as an exampleAuthors: FangBingWang XingjunLiuzhengwenSun HaijunZhang ZhenGaojiangtaoFangBingTarim Oilfield Company, PetroChina, Korla 841000, ChinaSearch for more papers by this author, Wang XingjunTarim Oilfield Company, PetroChina, Korla 841000, ChinaSearch for more papers by this author, LiuzhengwenTarim Oilfield Company, PetroChina, Korla 841000, ChinaSearch for more papers by this author, Sun HaijunTarim Oilfield Company, PetroChina, Korla 841000, ChinaSearch for more papers by this author, Zhang ZhenTarim Oilfield Company, PetroChina, Korla 841000, ChinaSearch for more papers by this author, and GaojiangtaoBureau of Geophysical ProspectingSearch for more papers by this authorhttps://doi.org/10.1190/FEW2019-19.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract The complex Kuqa mountainous area has two characteristics, including complex surface and underground conditions, such as large surface height difference, mountain development and horizontal ravines. The Paleogene halites are severely deformed by extrusion. Leading to the drastically changing thickness; the steep shallow salt; and a series of thrust-nappe structure is formed for the target layers under salt which results in low signal-to-noise ratio of seismic data, making it difficult to obtain good imaging. Through years of complicated mountain seismic data processing, the TTI anisotropic pre-stack depth migration and supporting technology of the undulating surface are formed. In the pre-stack depth migration velocity modeling, a small smooth surface datum is used, and a high-precision shallow velocity model is established by diving wave inversion velocity modeling. By using comprehensive application of surface outcrops, non-seismic, geological information, a reasonable mid-depth velocity model is established by drilling and logging data constraints. The velocity model and imaging accuracy are improved by well control TTI anisotropic parameter extraction and grid tomography. Through the TTI anisotropic pre-stack depth migration processing, the signal-to-noise ratio and imaging quality of the complex mountain seismic data of Kuqa are obviously improved, which lays a foundation for zone research and implementation of traps. Keywords: anisotropy, pre-stack, migrationPermalink: https://doi.org/10.1190/FEW2019-19.1FiguresReferencesRelatedDetails SEG 2019 Workshop: 2nd SEG Foothill Exploration Workshop, Chengdu, China, 12–14 April 2019ISSN (online):2159-6832Copyright: 2019 Pages: 79 publication data© 2019 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 28 Aug 2019 CITATION INFORMATION FangBing, Wang Xingjun, Liuzhengwen, Sun Haijun, Zhang Zhen, and Gaojiangtao, (2019), "Application of TTI Anisotropy Pre-stack Depth Migration in Foreland Area-Take the Kuqa area as an example," SEG Global Meeting Abstracts : 72-75. https://doi.org/10.1190/FEW2019-19.1 Plain-Language Summary Keywordsanisotropypre-stackmigrationPDF DownloadLoading ...

随着塔里木盆地缝洞型碳酸盐岩精细勘探的不断发展,迫切需要高信噪比、高分辨率的地震资料.在塔里木油田哈拉哈塘X工区进行了陆上单点高密度地震采集试验,实现了超万道全数字单点检波器接收高密度三维地震采集,提高了采集数据的连续性和均匀性,且在施工前建立了精细表层结构模型,保证了采集数据质量.本次地震处理更加有针对性,基于面波反演的地滚波压制技术和非规则相干噪声压制技术有效地解决了高密度地震数据的去噪问题;稳健地表一致性反褶积技术更好地解决了低信噪比的反褶积问题,还可以提高大数据的计算效率;炮检距向量片(OVT)域数据规则化技术解决了单次覆盖剖面的空道问题,进一步提高了地震数据的空间一致性;深度域精细速度建模保证了碳酸盐岩缝洞型储层的精确成像.单点高密度地震采集、处理一体化研究大幅度提高了研究区的地震资料质量,获得了高信噪比、高分辨率的最终成果数据,为缝洞型碳酸盐岩储层的勘探开发奠定了良好的基础.

压制相干噪声的方法通常基于两个基本假设:①相干噪声是线性的;②相干噪声与有效信号的视速度不同.但是实际地震资料往往不存在理想的相干噪声.基于上述考虑,提出一种基于局部数据规则化的相干噪声压制技术,通过在不规则观测系统局部区域利用五维插值技术求取最优解重构规则道集,让噪声满足相干的假设条件,从而实现更好的去噪效果.山地实际地震数据应用结果验证了该方法的有效性和实用性.

PreviousNext No AccessSPG/SEG 2016 International Geophysical Conference, Beijing, China, 20-22 April 2016Seismic data reconstruction method based compressed sensing theoryAuthors: Guo NianminChen MengFeng XuemeiSun HaijunZhao RuiruiGuo NianminTarim Oilfield Company, Petrochina, ChinaSearch for more papers by this author, Chen MengTarim Oilfield Company, Petrochina, ChinaSearch for more papers by this author, Feng XuemeiTarim Oilfield Company, Petrochina, ChinaSearch for more papers by this author, Sun HaijunTarim Oilfield Company, Petrochina, ChinaSearch for more papers by this author, and Zhao RuiruiTarim Oilfield Company, Petrochina, ChinaSearch for more papers by this authorhttps://doi.org/10.1190/IGCBeijing2016-217 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Due to the limition of the acquisition conditions, the missing of traces in prestack seismic data is serious. We presented a new interpolation method to recover the missing traces. Compressed sensing is a new signal sampling and recovery theory developed in recent years. The theory shows that even if the seismic data does not satisfy the request of Nyquist sampling theory, the original signal is also better recoveried from few observation data. According to the theory of compressed sensing, the extent of signal sparsity is the key to data recovery. This paper choose undecimated discrete wavelet transform to realise seismic data sparse representation, and presented a new seismic data interpolation method based compressed sensing theroy. This interpolation method could reconstruct the missing seismic traces, so as to improve the integrity of the pre-stack seismic data. Results of theoretical model and the real data processing verified the validity and reliable of the method. Keywords: interpolation, sensing, prestackPermalink: https://doi.org/10.1190/IGCBeijing2016-217FiguresReferencesRelatedDetailsCited byMicroseismic Signal Denoising via Empirical Mode Decomposition, Compressed Sensing, and Soft-thresholding24 March 2020 | Applied Sciences, Vol. 10, No. 6Two-Dimensional Seismic Data Reconstruction Method Based on Compressed Sensing13 September 2020 SPG/SEG 2016 International Geophysical Conference, Beijing, China, 20-22 April 2016ISSN (online):2159-6832Copyright: 2016 Pages: 749 publication data© 2016 Published in electronic format with permission by the Society of Exploration Geophysicists and Society of Petroleum GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 22 Apr 2016 CITATION INFORMATION Guo Nianmin, Chen Meng, Feng Xuemei, Sun Haijun, and Zhao Ruirui, (2016), "Seismic data reconstruction method based compressed sensing theory," SEG Global Meeting Abstracts : 713-715. https://doi.org/10.1190/IGCBeijing2016-217 Plain-Language Summary KeywordsinterpolationsensingprestackPDF DownloadLoading ...

Although continuous wavelet transform(CWT)is widely used in the field of geophysics because of its multiresolution,it still produces ambiguous results due to Heisenberg uncertainty principle. Whereas, the timefrequency resolution of CWT method can be improved further when combined with reassignment technique. This paper implements a reassigned version of continuous wavelet transform,which reassigns the energy to its local gravity center.Results of synthetic and field data show this method can characterize nonstationary variations of complex signals with high resolution,making the interpretation easier.

浅层油气藏由于埋藏浅,开采成本低,近年来受到越来越多的重视.浅层地震资料受近地表因素影响较大,噪声干扰严重,有效覆盖次数少,速度很难精确拾取.本文以D工区为例,总结出一套针对这种超浅层油气藏的地震处理关键技术,有效解决了静校正、叠前噪声压制以及精确速度场建立等方面的问题,较大改善了成像效果,尤其是断裂的成像质量.新地震资料目的层断点和断面波更加清晰,为断裂解释及断裂特征分析提供了可靠的依据.

PreviousNext No AccessBeijing 2014 International Geophysical Conference & Exposition, Beijing, China, 21-24 April 2014Full-azimuth seismic study for complex structural imaging and fracture detection: A case study in Well DB1 area, Tarim BasinAuthors: Yongfu Cui*Guochen WuZhengwen LiuRuirui ZhaoHaijun SunYongfu Cui*China University of Petroleum(East China)Tarim Oilfield Company, PetroChinaSearch for more papers by this author, Guochen WuChina University of Petroleum(East China)Search for more papers by this author, Zhengwen LiuTarim Oilfield Company, PetroChinaSearch for more papers by this author, Ruirui ZhaoTarim Oilfield Company, PetroChinaSearch for more papers by this author, and Haijun SunTarim Oilfield Company, PetroChinaSearch for more papers by this authorhttps://doi.org/10.1190/IGCBeijing2014-093 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract To explore the subsurface structures and associated fracture systems and reservoir mechanism in Well DB1 area, Tarim Basin, a full-azimuth seismic survey was conducted in 2012. Complex surface and subsurface structures in the area have posed serious challenges for seismic imaging. Large elevation changes and huge thickness variation in the weathering velocity zone lead to a serious statics problem. In addition, phenomena of all kinds of anisotropy are obviously observed in seismic data and the signal to noise ratio is poor. To overcome the difficulties, a series leading edge technologies have been used in the processing, which include turning wave tomographic inversion technique to build near-surface velocity model and solve statics problem in a time and depth domain consistent manner; A double square root NMO method to perform velocity analysis and stack with topographic variation; High-fidelity noise attenuation and data interpolation/ regularization in common offset vector (COV) domain to handle full azimuth data and enhance S/N ratio; Wide azimuth high-fidelity Controlled Beam Migration (HFCBM) to do TTI anisotropic pre-stack depth migration on common offset vector domain; Furthermore, using the multi-azimuth migrated gathers, the fracture density and orientation have been estimated by means of azimuthal NMO and AVAZ inversion. Keywords: seismic, data, processing, azimuth, fracturs, NMO, common offsetPermalink: https://doi.org/10.1190/IGCBeijing2014-093FiguresReferencesRelatedDetails Beijing 2014 International Geophysical Conference & Exposition, Beijing, China, 21-24 April 2014ISSN (online):2159-6832Copyright: 2014 Pages: 1360 publication data© 2014 Published in electronic format with permission by the Society of Exploration Geophysicists and Chinese Petroleum SocietyPublisher:Society of Exploration Geophysicists HistoryPublished Online: 24 Apr 2014 CITATION INFORMATION Yongfu Cui*, Guochen Wu, Zhengwen Liu, Ruirui Zhao, and Haijun Sun, (2014), "Full-azimuth seismic study for complex structural imaging and fracture detection: A case study in Well DB1 area, Tarim Basin," SEG Global Meeting Abstracts : 359-362. https://doi.org/10.1190/IGCBeijing2014-093 Plain-Language Summary KeywordsseismicdataprocessingazimuthfractursNMOcommon offsetPDF DownloadLoading ...

随着靖边气田上古丛式井压力下降,部分气井带液困难,气井原有的携液增压生产制度无法保证气井的正常生产,造成产量降低,甚至积液停产。现有排水采气方式主要采取打捞井下节流器后进行井口排液复产方式,复活后继续增压生产,该方式可以短期内保证气井正常生产,一段时间后气井携液能力下降,容易造成井筒再次积液。通过管柱优选能够增加气流流速,充分利用气井自身能量,长期保证气井连续携液生产。

Through analysing the affecting factor of pigging period, the three parameters of largest allowable pressure difference, largest allowable liquid loading and minimum gas transmission efficiency is selected for the criteria of pigging. Through static bleeding water and synthesize judgement of liquid carrying capacity of gas at present gas transmission rate, the reasonable pigging circle of every gas collecting main is calculated.

For the serious steam crossflow in multi-steam huff and puff well and the discharge of oil sludge,it is developed of blocking off high permeability zone.The affecting factors and blocking off effects are studied and predicted using STARS module of CMG.The results show:there is a optimal blocking radius and injection on rate of the reservoir with different aeolotropy.The imitation results is very valuable for directing the field conduct.