Liu L.,China University of Geosciences |
Tang D.-Z.,China University of Geosciences |
Wang F.,Sinopec |
Liu L.-H.,Rockstar Petroleum Science and Technology Ltd Company |
And 2 more authors.
Natural Gas Geoscience | Year: 2016
The seismic wave of P gather is ray path.Compared with angle gather,it is more close to the actual path of seismic wave and can express the subsurface reflection characteristics better.Moreover,ray parameter can be obtained directly from seismic data and does not depend on the speed of overlying strata,which avoid the inversion error caused by inaccurate velocity model.After the introduction of basic concepts and elastic parameters inversion of ray parameters,ray elastic impedance inversion of different ray parameters have been done with the method of Bayesian sparse pulse inversion on the basis of P stack data.And elastic parameters have been obtained with constrained searching method.Compared with the pre-stack elastic parameter inversion based on angle,the inversion results of the new method have high resolution and high accuracy.The method has been used to predict the reservoirs of Xinma and Yuanba areas in Sichuan Basin.Exploration results confirmed that the method is reliable and accurate,and the inversion results have significant meanings for the late exploration. © 2016, Science Press. All right reserved.
Chen S.,China University of Geosciences |
Yu X.-H.,China University of Geosciences |
Liu L.-H.,Rockstar Petroleum Science and Technology Co. |
Sun Y.-P.,Rockstar Petroleum Science and Technology Co. |
Lu R.,Rockstar Petroleum Science and Technology Co.
Acta Geoscientica Sinica | Year: 2015
The exact and efficient acquisition of frequency information of seismic data is the key to the time-frequency technique. Compared with common wavelet transform and generalized S transform method, the matching pursuit algorithm can obtain precise position both in time and frequency domain because of its higher time-frequency resolution and local adaptability. The accurate information of frequency domain can help to do seismic attributes and hydrocarbon detection work. RGB plot is a display technique, which divides several frequency data into lower frequency, middle frequency and higher frequency data, with the display fused by red, green, and blue. This technique can reflect information of various bands, which avoids the less information of a single attribute. In practical application, RGB plot by matching pursuit algorithm is used to depict the channel boundary and characterize the heterogeneity of inner channel to a certain degree, which has profound significance in comparison with common attribute. ©, 2015, Science Press. All right reserved.
Liu L.,China University of Geosciences |
Tang D.,China University of Geosciences |
Xu H.,China University of Geosciences |
Liu L.,Rockstar Petroleum Science and Technology Ltd Company
Marine and Petroleum Geology | Year: 2016
Currently, conventional forecasting methods of well-to-seismic integration are unable to identify turbidite channel sandstones due to scarcity of well data in deepwater areas, small geophysical differences between sandstones and mudstones of turbidite channels and strong sandstones heterogeneity. The reservoir prediction of deep-water turbidite channels is still a difficult issue in deep-water research. On the basis of previous studies, we propose a new technology named "reservoir prediction of deep-water turbidite sandstones with seismic lithofacies control" in view of the characteristics of deep-water turbidite sandstones. This new technology improves the reservoir prediction of complex sedimentary systems after classifying seismic lithofacies and connecting lithofacies with rock-physics. Furthermore, it can accomplish the genetic classification statistics of rock-physics, improve conversion accuracy of seismic elastic parameters/reservoir parameters and achieve the quantitative reservoir prediction under the double control of seismic geomorphology and seismic lithofacies. The C block of Lower Congo Basin is characterized by few well data, complex lithology but high resolution-seismic. We use the technology to predict the reservoirs of this area and have achieved excellent results. This has great significance for the later exploration. © 2015 Elsevier Ltd.
Fan R.,Sinopec |
Liu L.,Rockstar Petroleum Science and Technology Ltd |
Shi W.,Sinopec |
Zhang G.,Sinopec |
Geophysical Prospecting for Petroleum | Year: 2015
Braided river delta front facies mainly develop in lower subsection of Xu_2 member in western Yuanba area, where sand bodies develop in subaqueous distributary channels. Deep buried depth, strong compaction and compact rocks would increase difficulty in reservoir prediction. To solve the problems mentioned above, “facies-controlled reservoir prediction” research ideas are adopted. First of all, the seismic attributes that are sensitive to lithological prediction are optimally selected by petrophysics analysis, and by utilizing seismic sedimentology research method, the seismic geomorphologic maps represented by prestack S attribute is obtained to predict the distribution of channel sands. And then the data bodies of seismic reservoir property facies are derived by coordinate rotation from prestack near, far angle elastic impedance inversion results, which is used to predict the distribution of effective reservoirs in lower subsection of Xu_2 member. Drilling results of recommended well locations show that the reservoir prediction accuracy is high and the method is effective. ©, 2015, Science Press. All right reserved.
Liu L.,Rockstar Petroleum Science and Technology Ltd Company |
Chen S.,Rockstar Petroleum Science and Technology Ltd Company |
Ni C.,Rockstar Petroleum Science and Technology Ltd Company
Geophysical Prospecting for Petroleum | Year: 2013
Seismic lithology and seismic geomorphology are subdisciplines of seismic sedimentology. Seismic geomorphology focuses on plane sedimentary imaging by stratal slice. Seismic lithology serves seismic geomorphology by interpreting the seismic data into a lithologic data with a clear sense of lithology cube. The seismic lithologic cube should satisfy three demands. Firstly, the amplitude of the data volume is related to lithology. Secondly, the horizontal amplitude preserved relatively. Thirdly, the value of data should be relative. The result of Ray-path elastic impedance colored inversion can be regarded as an attribute volume with lithology cube meaning for its value is close to well and horizontal amplitude is preserved relatively. This technology obtained good result in practical application of seismic lithology research at Lixian slope of Raoyang Sag in Jizhong Depression.