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Composite Sand Bodies Architecture of Deep-Water Turbidite Channels in the Niger Delta Basin

Acta Geologica Sinica(English Edition) 2014年第6期88卷 1822-1834页

作者： LIN Yu WU Shenghe WANG Xing LING Yun LU Yao ZHANG Jiajia YU Zhi College of Geosciences China University of Petroleum bgp inc. China National Petroleum Corporation research institute China National Offshore Oil Corp

Deep-water turbidite channels have attracted much attention as a focused issue in petroleum exploration and development. Extensive studies have been performed on the architecture of turbidite channels, and most researches have focused on their geometric shapes, sedimentary processes and controlling factors. However, little attention has been paid to the distribution patterns, distribution laws and quantitative studies of composite sand bodies of turbidite channels. Taken one slope area of the Niger Delta Basin as an example, this study conducted a semi-quantitative to quantitative analysis on architecture of composite sand bodies of turbidite channels based on cores, well logging and seismic surveys. It is shown that turbidite channel systems can be classified as confined and unconfined channel systems. For confined channel systems, the vertical evolution process involves four stages. The sinuosity of a channel system is controlled by slope, with a negative power function relationship between them. When slope gradient reaches four degrees, the channel system is nearly straight. Based on the migration direction and migration amount of single channels within channel complexes, channel composite patterns can be divided into four classes（the lateral composite, en-echelon composite, swing composite and vertical composite） and several subclasses. Various channel composite patterns show specific distribution laws spatially. For meandering channel complexes at the middle-late evolution stage of confined channel systems, the lateral migration amongst single channels shows the features of integrity and succession. The sinuosity of single channels in the late period is greater than that in the early period, and cut-offs may occur locally when the sinuosity is larger than five degrees. This study provides a better understanding for the geological theory of deep-water sedimentary, and also improves exploitation benefits of this type of reservoirs.

关键词： turbidite channels composite sand bodies architecture Niger Delta Basin quantitative relations

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Logging prediction and evaluation of fracture toughness for the shales in the Longmaxi Formation, Southern Sichuan Basin

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petroleum 2021年第3期7卷 254-262页

作者： Jian Xiong Kaiyuan Liu Changyou Shi Xiangjun Liu Linlin Huang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina geophysical Technology research Center of bgp inc China National Petroleum CorporationChengduChina

The mode-I fracture toughness is of great significance for evaluating the fracturing ability of shale *** this study,the mode-I fracture toughness of the shale in the Lower Silurian Longmaxi Formation,Southern Sichuan Basin was determined with the Cracked Chevron Notched Brazilian Disc(CCNBD).Based on the experimental data,the relationships among the mode-I fracture toughness,the density,the acoustic time and the clay mineral content were *** shale samples for fracture toughness test from cores were commonly limited,the investigation of fracture toughness using well logs was ***,a prediction model was proposed by correlating the fracture toughness with well logs *** results indicate that the fracture toughness of shale samples is from 0.4744 MPa$m1/2 to 1.0607 MPa$m1/2 with an average of 0.7817 MPa$m1/2,indicating that the anisotropy of fracture toughness of the Longmaxi Formation *** clay mineral content and the density have a positive effect on the fracture toughness,whereas the acoustic time plays a negative role on the fracture *** clay mineral content has an important effect on the relationships among fracture toughness,acoustic time and *** prediction model can provide continuous data of mode-I fracture toughness along the wellbore for field hydraulic fracturing operation,and it has certain guiding significance in the exploration and development of oil and gas reservoirs.

关键词： Rock mechanics Longmaxi formation shale CCNBD Mode-I fracture Toughness Prediction method

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Zircon U-Pb Geochronology of Baoyintu Group in the Northwestern Margin of the North china Craton and Its Geological Significance

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Journal of Earth Science 2023年第5期34卷 1511-1526页

作者： Chengwu Ding Yifei Liu Pan Dai Sihong Jiang Chengzhen Ding School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255000China MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 100037China geophysical research institute of bgp inc.china national petroleum corporation Zhuozhou 072751China

The Baoyintu uplift is located at the northwestern margin of the North china Craton(NCC). The affiliation and evolution history of the uplift have been unresolved until now. Here we present LA-ICP-MS and SHRIMP U-Pb data for zircons extracted from samples of monzogranitic orthogneiss and the Baoyintu Group in the uplift. The 1 679 ± 13 Ma date for the orthogneiss demonstrates that Late Palaeoproterozoic rocks do exist in the uplift. The ca. 1 413 Ma minimum age of detrital zircons in metasedimentary rocks shows that the maximum age of the Baoyintu Group is Mesoproterozoic. The age distribution of detrital zircons in the first unit of the Group form clusters at ca. 2 680, 2 450, 1 800 and 1 560 Ma, which partly correspond to tectonic-magmatic-metamorphic events previously recognised in the NCC, and show that the metasedimentary rocks are largely sourced from different parts of the NCC. These confirm that the Baoyintu uplift is part of the NCC. Amphibolite with a dolerite protolith from the third unit of Baoyintu Group shows evidence for metamorphism during ca. 877–851 Ma. This combined with published geochronological data indicate the presence of Neoproterozoic magmatic and metamorphic events in the NCC, which significantly increases our understanding of the Proterozoic tectonic evolution of the region and its possible correlation with the Rodinian Supercontinent.

关键词： Proterozoic Baoyintu Group zircon U-Pb dating North china Craton geochemistry

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Influences of bedding characteristics on the acoustic wave propagation characteristics of shales

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petroleum 2021年第1期7卷 33-38页

作者： Jian Xiong Kaiyuan Liu Xiangjun Liu Lixi Liang Chongyang Zhang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengduChina geophysical Technology research Center of bgp inc. China National Petroleum CorporationChengduChina

The acoustic response characteristics of shales were investigated by the acoustic transmission experiment,which is the basis of solving geological and engineering problems using the seismic or logging information during the process of the exploration and development of shale gas *** on the theory of acoustic wave and the background of acoustic transmission experiment,the initial condition,vibration source condition,boundary condition and stability condition were constructed,and the numerical simulation of acoustic transmission experiment of shales were completed through Matlab *** results show that under the same bedding angle,the acoustic time and attenuation coefficient of shales shown positive correlation with the bedding density;whereas under the same bedding density,the variation laws of the acoustic time and the attenuation coefficient of shales were more complex with the change of the bedding angle,that is,the acoustic time and attenuation coefficient of shales increased first,then decreased and then increased again with the increase of the bedding angle.

关键词： Shale Bedding characteristics Acoustic wave Numerical simulation

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Logging-based assessment of low-resistivity oil zones:A case study from Sudan

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Energy Geoscience 2023年第2期4卷 82-90页

作者： Li Chunmei Wu Furong Zang Dianguang Peng Cai Guo Hongxi Li Jie Southwest geophysical research institute BGP Inc.China National Petroleum CorporationChengduChina Petro china Southwest Oil&Gas Feild Company ChengduChina

The reservoirs in the N oilfield in Sudan feature a complex sedimentary environment,which has led to a widespread development of low-resistivity oil zones,accounting for as high as 37%of the total oil *** this case,a large number of oil zones will be misinterpreted using conventional *** on the analysis of the core data and logging curves of the study area,this study concludes that the lowresistivity oil zones are formed mainly due to the high irreducible water saturation caused by the high content of illite and smectite and complex pore structure,the additional electrical conductivity induced by clay minerals,and the difference in formation water salinity between the oil zones and water ***,four methods are proposed to qualitatively identify these oil zones and water zones,namely the relationship analysis of five reservoir properties,cross-plotting of sensitive parameters,analysis of pressure testing data,and multi-well ***,the study quantitatively calculates the initial oil saturation using the capillary pressure data,thus avoiding the conventional empirical saturation formulas depending on electrical resistivity and solving the difficulty in calculating oil saturation of low-resistivity oil ***,precise logging processing and interpretation of 95 wells in the study area are conducted using the above-mentioned comprehensive assessment system for low-resistivity oil *** a result,59 oil zones are newly discovered in 43 ***,it is recommended that 17 oil zones in 12 wells should be tested,of which 11 oil zones have been tested as recommended,all proven to be high production oil zones after *** coincidence rate of logging interpretation increases from 75%to 94.3%,and the original oil in place(OOIP)increases by 57.42 million *** these indicate that the assessment system proposed is suitable for low-resistivity zones.

关键词： Low-resistivity oil zone Cause analysis Qualitative identification J-function Saturation

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Diagenesis of the Triassic Yanchang Formation Tight Sandstone Reservoir in the Xifeng–Ansai Area of Ordos Basin and its Porosity Evolution

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 956-970页

作者： LIU Mingjie LIU Zhen WANG Peng PAN Gaofeng School of Geoscience and Technology Southwest Petroleum University State Key Laboratory of petroleum Resources and Prospecting China University of Petroleum(Beijing) Changqing Branch of geophysical research institute BGP Inc.CNPC

This work aims to reveal the evolution of the porosity in the Triassic Yanchang Formation tight sandstone reservoir of the Xifeng-Ansai area of Ordos Basin. Based on destructive diagenesis （compaction and cementation） and constructive diagenesis （dissolution） of sandstone reservoirs, this study analyzed the diagenesis characteristics of the tight sandstone reservoirs in this area, and discussed the relationship between sandstone diagenesis and porosity evolution in combination with present porosity profile characteristics of sandstone reservoir. The effect simulation principle was employed for the mathematical derivation and simulation of the evolution of porosity in the Yanchang Formation tight sandstone reservoirs. The result shows that compaction always occurs in tight sandstone reservoirs in the Yanchang Formation, and cementation occurs when the burial depth increases to a certain value and remains ever since. Dissolution occurs only at a certain stage of the evolution with window features. In the corresponding present porosity profile, diagenesis is characterized by segmentation. From the shallow to the deep, compaction, compaction, cementation and dissolution, compaction and cementation occur successively. Therefore, the evolution of sandstone porosity can be divided into normal compaction section, acidification and incremental porosity section, and normal compaction section after dissolution. The results show that the evolution of sandstone porosity can be decomposed into porosity reduction model and porosity increase model. The superposition of the two models at the same depth in the three stages or in the same geological time can constitute the evolution simulation of the total porosity in sandstone reservoirs. By simulating the evolution of sandstone reservoir porosity of the eighth member in Xifeng area and the sixth member in Ansai area, it shows that they are similar in the evolution process and trend. The difference is caused by the regional uplift or

关键词： tight sandstone diagenesis porosity evolution effect simulation Yanchang Formation Ordos Basin

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An improved deep dilated convolutional neural network for seismic facies interpretation

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petroleum Science 2024年第3期21卷 1569-1583页

作者： Na-Xia Yang Guo-Fa Li Ting-Hui Li Dong-Feng Zhao Wei-Wei Gu State Key Laboratory of petroleum Resources and Engineering CNPC Key Lab of Geophysical ExplorationChina University of Petroleum(Beijing)Beijing 102249China Dagang Branch Research InstituteBGPTianjin300280China

With the successful application and breakthrough of deep learning technology in image segmentation,there has been continuous development in the field of seismic facies interpretation using convolutional neural *** intelligent and automated methods significantly reduce manual labor,particularly in the laborious task of manually labeling seismic ***,the extensive demand for training data imposes limitations on their wider *** overcome this challenge,we adopt the UNet architecture as the foundational network structure for seismic facies classification,which has demonstrated effective segmentation results even with small-sample training ***,we integrate spatial pyramid pooling and dilated convolution modules into the network architecture to enhance the perception of spatial information across a broader *** seismic facies classification test on the public data from the F3 block verifies the superior performance of our proposed improved network structure in delineating seismic facies *** analysis against the traditional UNet model reveals that our method achieves more accurate predictive classification results,as evidenced by various evaluation metrics for image ***,the classification accuracy reaches an impressive 96%.Furthermore,the results of seismic facies classification in the seismic slice dimension provide further confirmation of the superior performance of our proposed method,which accurately defines the range of different seismic *** approach holds significant potential for analyzing geological patterns and extracting valuable depositional information.

关键词： Seismic facies interpretation Dilated convolution Spatial pyramid pooling Internal feature maps Compound loss function

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Application of multi-component joint inversion in oil and gas exploration:A case study of reservoir and gas saturation prediction of the Xujiahe formation in the PLN area of the central Sichuan Basin

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Applied Geophysics 2020年第5期17卷 879-889,905页

作者： Wang Dong He Zhen-Hua Wang Xu-Ben Li Le Yang Hai-Tao Fu Zhi-Guo Wang Hong-Yan The college of geophysics Chengdu University of TechnologyChengdu 610059China bgp inc. China National Petroleum CorporationZhuozhou 072750China Mountain geophysical Technology Test Center CNPC Chengdu 610213China

Multi-component seismic exploration is an important technique in the utilization of P-waves and converted S-waves for oil and gas *** has unique advantages in the structural imaging of gas zones,reservoir prediction,lithology,and gas-water identifi cation,and the development direction and degree of ***-component joint inversion is one of the most important steps in multi-component *** this paper,starting from the basic principle of multi-component joint inversion,the diff erences between the method and single P-wave inversion are ***,the technique is applied to the PLN area of the Sichuan Basin,and the P-wave impedance,S-wave impedance,and density are obtained based on multi-component joint *** the velocity and lithology,porosity,and gas saturation fi tting formulas,prediction results are calculated,and the results are ***,multi-component joint inversion and single P-wave inversion are compared in eff ective reservoir *** results show that multi-component joint inversion increases the constraints on the inversion conditions,reduces the multi-solution of a single P-wave inversion,and is more objective and reliable for the identification of reservoirs,effectively improving the accuracy of oil and gas reservoir prediction and development.

关键词： multi-component joint inversion lithology identifi cation porosity gas saturation reservoir prediction

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Inversion-based attenuation compensation with dip constraint

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petroleum Science 2022年第2期19卷 543-553页

作者： Xiong Ma Li-Li Huo Guo-Fa Li Hao Li Qing-Long Meng School of Geophysics China University of Petroleum-BeijingState Key Lab of Petroleum Resources and ProspectingKey Lab of Geophysical Exploration of CNPCChangping102249BeijingChina Exploration and Development research institute Jidong OilfieldChina National Petroleum CorporationTangshanHebei 063000China Exploration and Development research institute Dagang OilfieldChina National Petroleum CorporationTianjin300280China

Instability is an inherent problem with the attenuation compensation methods and has been partially relieved by using the inverse ***,the conventional inversion-based attenuation compensation approaches ignore the important prior information of the seismic ***,the compensated result appears to be distorted spatial continuity and has a low signal-to-noise ratio(S/N).To alleviate this issue,we have incorporated the seismic dip information into the inversion framework and have developed a dip-constrained attenuation compensation(DCAC)*** seismic dip information,calculated from the poststack seismic data,is the key to construct a dip constraint *** from the introduction of the seismic dip constraint,the DCAC approach maintains the numerical stability and preserves the spatial continuity of the compensated *** and field data examples demonstrate that the proposed method can not only improve seismic resolution,but also protect the continuity of seismic data.

关键词： Attenuation compensation Instability Inverse scheme Seismic dip Seismic resolution Spatial continuity

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Linearized waveform inversion for vertical transversely isotropic elastic media:Methodology and multi-parameter crosstalk analysis

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petroleum Science 2024年第1期21卷 252-271页

作者： Ke Chen Lu Liu Li-Nan Xu Fei Hu Yuan Yang Jia-Hui Zuo Le-Le Zhang Yang Zhao national Key Laboratory of petroleum Resources and Engineering Unconventional Petroleum Research InstituteChina University of Petroleum(Beijing)Beijing102249China Aramco Beijing research Center Aramco AsiaBeijing100102China University of Lausanne LausanneCH-1015Switzerland Bureau of geophysical Prospecting China National Petroleum CorporationZhuozhou 072750HebeiChina

Seismic migration and inversion are closely related techniques to portray subsurface images and identify hydrocarbon *** migration aims at obtaining structural images of subsurface geologic *** specifically,seismic migration estimates the reflectivity function(stacked average reflectivity or pre-stack angle-dependent reflectivity)from seismic reflection *** the other hand,seismic inversion quantitatively estimates the intrinsic rock properties of subsurface *** seismic inversion methods are applicable to detect hydrocarbon reservoirs that may exhibit lateral variations in the inverted *** there exist many differences,pre-stack seismic migration is similar with the first iteration of the general linearized seismic ***,seismic migration and inversion techniques assume an acoustic or isotropic elastic *** reservoirs such as shale and tight sand formation have notable anisotropic *** present a linearized waveform inversion(LWI)scheme for weakly anisotropic elastic media with vertical transversely isotropic(VTI)*** is based on two-way anisotropic elastic wave equation and simultaneously inverts for the localized perturbations(ΔVp_(0)/Vp_(0)/Vs_(0)/Vs_(0)/,Δ∈,Δδ)from the long-wavelength reference *** proposed VTI-elastic LWI is an iterative method that requires a forward and an adjoint operator acting on vectors in each *** derive the forward Born approximation operator by perturbation theory and adjoint operator via adjoint-state *** inversion has improved the quality of the images and reduces the multi-parameter crosstalk comparing with the adjoint-based *** have observed that the multi-parameter crosstalk problem is more prominent in the inversion images for Thomsen anisotropy ***,the Thomsen parameter is the most difficult to *** also analyze the multi-parameter crosstalk using scattering radiation patte

关键词： Elastic Anisotropy Least-squares imaging Waveform inversion Computational geophysics

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