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Gong B.,Peking University | Li J.,Peking University | Shan Y.,LandOcean Energy Services Co.
Society of Petroleum Engineers - International Petroleum Technology Conference 2013, IPTC 2013: Challenging Technology and Economic Limits to Meet the Global Energy Demand | Year: 2013

An integrated approach of fractured reservoir modeling is presented. First, the fracture density and azimuth distribution of the entire reservoir is mapped from seismic anisotropy analysis and image log calibrations. Then we apply a dynamic workflow to construct the discrete fracture model by connecting fracture elements laterally and vertically. A tetrahedral grid is then generated for detailed reservoir simulation that fully resolves the discrete fracture characterization. Finally the flow simulation is performed on an actual carbonate reservoir block in the Mideast. This study presents a systematic way of modeling and simulating fractured reservoirs. Copyright © 2013 International Petroleum Technology Conference.

Liang F.-K.,China University of Geosciences | Yu X.-H.,China University of Geosciences | Li X.-P.,Petrochina | Zou M.,China University of Geosciences | Sun X.-C.,LandOcean Energy Services Co.
Geology in China | Year: 2011

As we all know, structure controls sedimentation, while sedimentation controls the reservoir. Lots of sedimentary facies maps, however, were compiled without considering the control of structural factors over the depositional system, which has led to the severe defect that sedimentary facies or/and palaeogeographic maps do not match with contemporaneous structural configuration. Growth faults are the main structural factors, whose activity would control the forming process of sedimentary strata. There were four types of growth faults developed in Shenxian depression in Cenozoic, constituting models of late activity, continuous activity, periodic activity and deep extension. In addiction, based on regional sediments provenance analysis, the authors probed into the control of growth faults over depositional systems, and found that subaqueous fans were developed in the south while deltas were developed in the north. The spread of the fronts of these two depositional systems were further controlled by growth faults, presenting characteristics that lobes spread along faults on the map while wedges overlap in the cross section.

Liu E.,LandOcean Energy Services Co. | Chen L.,Beijing Feiruixinlong Technology Co. | Liu Z.,Henan Polytechnic University
SEG Technical Program Expanded Abstracts | Year: 2011

In Ordos basin in western China, the surface is covered by exceedingly thick loess, surface elevation varies acutely, and there are poignant lateral variations in thickness of weathering layer. The lateral weathering layer velocity is relatively stable; however, the vertical weathering layer velocity varies continuously with depth. So, there are many difficulties in near-surface survey, model-building of near-surface structures and solving the uncertain problem of static correction. The conventional tomostatics methods may fail to solve the serious statics problem because of high dependence on initial near-surface model. A new tomostatics method named ESMODEL method has been developed by Chen. We applied the ESMODEL method to solve the statics problem for the land data acquired in experimental area of Ordos basin in western China. The ESMODEL method uses the conjugate-gradient algorithm in conjunction with the genetic algorithm to inverse the parameters of near-surface model from picked first-break time and estimates the statics, it is less dependent on the initial near-surface model. The stacked section after the ESMODEL static correction is significantly improved in comparison with that after conventional tomostatics correction. Then, the residual reflection statics are calculated using the Monte Carlo resident statics method to further improve the data quality. © 2011 Society of Exploration Geophysicists.

Guo M.,LandOcean Energy Services Co. | Zhao Y.,LandOcean Energy Services Co. | Zuo S.,Sinopec | Ba J.,Petrochina
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | Year: 2012

This paper presents a multiple attenuation approach for Australian marine seismic data. In view of long path and peg-leg multiples significantly growing, comparisons of different multiple attenuation methods are made and the strategies of combined multiple suppression are proposed. The steps of multiple attenuation shows as follows: (1)Radon transform is performed after the first round of velocity analysis to attenuate most of the long-path multiples. (2)Predictive deconvolution is used to attenuate most of the peg-leg multiples. (3)High precision Radon transform is performed after the second round of velocity analysis to attenuate residual multiples. (4)Radon transform plus inner mute is performed on CPR gathers to suppress peg-leg multiples with small time differences. The results prove the efficiency of this combined approach. Primary reflections are improved.

Dong J.C.,International Research Center | Zhao L.D.,LandOcean Energy Services Co.
75th European Association of Geoscientists and Engineers Conference and Exhibition 2013 Incorporating SPE EUROPEC 2013: Changing Frontiers | Year: 2013

Sarvak formation of Azadegan oilfield is a carbonate serial in Upper Cretaceous of Middle East. Some particular geobodies as tidal channels were recognized by exploration and geological research. Through the study of sedimentology, the geological setting of tidal channels in Sarvak formation was discussed, confirming that these channels developed in rimmed shelf carbonate platform. The tidal channels that developed in the platform have high energy conditions; therefore this kind of tidal channels is the areas with favour reservoirs, playing an important role in oil&gas exploration. Copyright © (2012) by the European Association of Geoscientists & Engineers All rights reserved.

Zhang Y.,LandOcean Energy Services Co. | Zhang Z.R.,LandOcean Energy Services Co. | Rui Z.F.,LandOcean Energy Services Co.
76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 | Year: 2014

The reservoir type of Yuqi mainly is cave type, which is not detailed description, and the filled and unfilled condition of it is not effectively distinguished. Therefore, quantitative description of carbonate cave reservoir is necessary. According to the actual condition of Yuqi, the method is provided for describing carbonate cave reservoir quantitatively. Firstly, geological models of cave reservoir are established considering different size and filling degree. Secondly, the technique of wave equation forward modelling is adopted for obtaining seismic response. The seismic multi-attribute analysis technique is used to choose the sensitive attribute of different modelling results. Then the quantities version is built by finding the relationship of sensitive attribute height/width, model height/width and filling degree of cave, which is finally used in effective reservoir quantitative description. The sensitive attributes for cave reservoir and unfilled cave reservoir separately are root-mean-square amplitude (RMS), and attenuation gradient. By the application of quantitative description method, the relative error of RMS height/width and model height/width is less than 17%, which proves that this method of restoring cave reservoir size is reliable. Meanwhile, the predicted result of judging filling degree by attenuation gradient quantities version for practice well coheres with practice condition.

Lin C.,LandOcean Energy Services Co. | Wang H.Q.,LandOcean Energy Services Co. | Guo M.,LandOcean Energy Services Co.
75th European Association of Geoscientists and Engineers Conference and Exhibition 2013 Incorporating SPE EUROPEC 2013: Changing Frontiers | Year: 2013

Based on anisotropic acoustic wave equation, we perform high order finite difference method to improve imaging accuracy by virtue of GPU. Random boundary, symmetry boundary and PML are employed to remove boundary reflections according to different situations. Copyright © (2012) by the European Association of Geoscientists & Engineers All rights reserved.

Yu Z.,Beijing University of Technology | He J.,LandOcean Energy Services Co.
International Journal of Geophysics | Year: 2013

In order to predict the fluid in thin layer precisely, this paper proposed a high-resolution method for fluid prediction. The method used geostatistical inversion with lithology masks to calculate water saturation. We applied this method to theoretical model and real data. The result was compared with that of prestack AVA simultaneous inversion for fluid prediction. It showed that this method had high resolution both in vertical and lateral directions for fluid prediction and could also predict the fluid in thin layer efficiently. © 2013 Zhen Yu and Jing He.

Hu X.Y.,LandOcean Energy Services Co.
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

The main production layer in Oseil field is carbonate rock in Manusela Formation, East Indonesia. The main storage and accumulation space of the carbonate is fractured porous media and the reservoir distribution possesses strong heterogeneity. With integrated utilize the petro-physical forward modeling and pre-stack seismic anisotropy analysis technology, we find a suite of techniques for fractured carbonate reservoir description, which is also suitable for the poor seismic quality. Compared with the traditional fracture detection method, such as coherence and stress field analysis, the seismic anisotropy analysis has the feature of high accuracy and reliability. There are two newly drilling wells in 2010 which are coincident with the prediction result. It also suggested the feasibility of the technology suite and the reliability of the workflow.

Ma Z.H.,LandOcean Energy Services Co. | Xie G.S.,LandOcean Energy Services Co. | Li M.,LandOcean Energy Services Co.
76th European Association of Geoscientists and Engineers Conference and Exhibition 2014: Experience the Energy - Incorporating SPE EUROPEC 2014 | Year: 2014

better understanding of wave fields that propagate in the near-surface and true underground medium, help to study the complex mountainous prestack migration imaging method. However, topography poses a problem for finite difference method. The present studies of the free-surface condition are concerned with the more general isotropic cases. This paper extends the image method from the existing elastic/ viscoelastic isotropic media model to anisotropic medium model. This new method is simple to implement in conventional staggered finite difference schemes, is computationally efficient and enables modeling of highly irregular topography.

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