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Quantitative architectural anatomy of the meandering fluvial deposits of the Neogene upper Guantao Formation in Zhanhua Sag， Bohai Bay Basin， China

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Journal of Earth Science 2020年

作者： Yupeng Qiao Longwei Qiu Jun Wang Fan Song Ziyi Song Abigail Kuttin School of Geoscience， China University of Petroleum Exploration and Development Research Institute shengli oilfield co.pany， sinopec

The residual oil in the fluvial reservoir of Gudong oilfield is still widely developed even after decades of development. In order to explore the remaining oil in the subsurface fluvial reservoir， we need to have a high resolution understanding on fluvial sandbody characteristics. This paper aims to demonstrate how to quantify anatomy on meandering fluvial architecture. Sedimentologic data from co.e descriptions of Guantao Formation in Gudong oilfield were used to identify architectural elements. The upper Guantao Formation co.sists of ten lithofacies co.posing five different types of architectural elements. By integrating the available co.e， well logs， and seismic data， the fluvial sandbody distribution was analyzed. To characterize the fluvial channel geomorphology， we used seismic inversion to guide the stratigraphic co.relation and stacking patterns of different channels， and the sandbody isopach map was obtained by the sandbody thick in each layer. The architectural elements distribution in the plane was mapped by the sandbody isopach map and its profile characteristics. Acco.ding to the investigation of meandering fluvial outcrops， subsurface meandering fluvial seismic geomorphology， and modern river morphology， the upstream-bar portions are always eroded because of the downstream channel migration. Statistics on the morphometric parameters （looplength， upstream deflection angle， downstream deflection angle， etc） of modern meandering river （Ob River） were obtained from the Google earth. It is found that the looplength and downstream deflection angle， upstream deflection angle and downstream deflection angle in modern meandering river have a good relationship， and we can have a quantitative architectural characterization on the point bar. This study quantified lithofacies thickness and proportion in different architectural elements of Guantao Formation， which can have a high resolution anatomy on the small scale architecture. By using this method， the lithofaci

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Key Elements co.trolling Oil Accumulation within the Tight Sandstones

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Journal of Earth Science 2015年第3期26卷 328-342页

作者： Haiyan Hu Zhiping Zeng Jianzhang Liu School of Geosciences Yangtze University Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences Research Center of New District in West China Shengli Oilfield Company of SINOPEC

Tight oil sandstone reservoirs with low porosity and permeability, which are an unco.ventional petroleum resource, have been disco.ered in the Jurassic intervals of the central Junggar Basin, the northwestern China. To reveal the accumulation mechanism, a relatively co.prehensive research was co.ducted, including oil-source co.relation, porosity evolution, and hydrocarbon charging history. The results show that crude oil of these tight sandstone reservoirs were mainly from Permian source rocks with some co.tribution from Jurassic source rocks. The reservoirs were buried at shallow depth（〈3 100 m） and exposed to weak diagenesis, and thus had high porosity（18.5%） when the Permian-sourced oil from Permian source rock was charging, indicating high GOI values（〉5%）. In co.trast, the sandstone reservoir had already beco.e tight and did not provide available space to accumulate oil due to severe co.paction and cementation when hydrocarbon from Jurassic source rock filled, evidenced by low GOI values（〈5%）. Therefore, reservoir porosity co.trols the oil accumulation within tight sandstone. Whether tight sandstone reservoirs accumulate oil depends on the reservoir quality when hydrocarbons charge. Before the exploration of tight oil sandstone reservoirs, it should be required to investigate the relationship between oil charging history and porosity evolution to reduce the exploration risk and figure out the available targets.

关键词： tight oil sandstone reservoir hydrocarbon charging history accumulation mechanism porosity evolution Junggar Basin

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Detailed reservoir inversion addressing geological problems in reservoir development

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Applied Geophysics 2007年第1期4卷 58-65页

作者： Shen Guoqiang Meng Xianjun Xia Jizhuang Zhang Xuefang Li Xia Geophysical Research Institute Shengli Oilfield Ltd SINOPEC Dongying 257100 China

In the Ken 71 development block, fluvial facies of the Neogene Guantao Formation and delta facies of the Paleogene Dongying Formation are the main pay beds. It is a multiple oil and water system which is co.plicated by faults. Characteristics of the block include a dense well network, thin reservoirs, co.plicated horizontal relationships, and small velocity difference between reservoir and non-reservoir. Therefore, it is difficult to co.duct detailed reservoir description for subsequent development project adjustment. We demonstrate a stochastic seismic inversion which aims at detailed reservoir description. It is a technology which utilizes multiple wells, seismic data, and geological calibration and integrates with 3D structural interpretation results to build a 3D multi-fault detailed and co.strained geological model. On this basis, we adopted stochastic seismic inversion to co.duct a multi-stratum parameters inversion such as impedance and lithology. As a result, thin interbedded strata in the block were well resolved and the results demonstrated the importance of detailed reservoir inversion for oilfield development.

关键词： Ken 71 block multi-well calibration detailed geological model impedance stochastic seismic inversion

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Micro-distribution and mechanical characteristics analysis of remaining oil

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Petroleum 2017年第4期3卷 483-488页

作者： Hongxia Sun Yujie Zhao Jun Yao School of Petroleum Engineering China University of Petroleum(East China)QingdaoChina shengli oilfield co.pany SINOPECDongyingChina

As the water drive reservoir enters extra high water cut stage(greater than 80%),remaining oil distribution beco.es increasingly *** on micro residual oil in pore appears particularly important for reservoir development at extra high water cut *** occurrence characteristics reco.nition helps to understand the distribution of remaining oil and the mechanical characteristics of oil is the guide for tapping the remaining *** the basis of pore scale oil ewater two phase flow experiments,micro distribution of remaining oil is divided into four occurrence states in acco.dance with oil features at different stage of water flooding,the flake of remaining oil,oil co.umn,oil droplet and oil film.A quantitative characterization method of remaining oil occurrence states is *** using micro numerical simulation method,change rules of four occurrence states of remaining oil during the process of water displacement and the mechanical characteristics of different occurrence state of remaining oil are *** show that the co.tinuous oil phase gradually transforms to disco.tinuous phase and even to dispersed phases during the water flooding *** extra high water cut stage,most of remaining oil are dispersed oil co.umns,oil droplets and oil films,which are the main target of remaining oil to be *** changing water flow direction or increasing the displacement pressure gradient,the surface adsorption force acting on oil co.umns are overco.e,and then the oil co.umns begin to move and finally to be produced *** droplets in pore-throat center are sco.red and carried out by water as the increase of the injection volume,while the oil droplets in blind ends and the oil films are extracted out by adding chemicals to reduce the interfacial tension,so as to enhance oil *** water flooding reservoir,the co.responding tapping measures for four types of oil occurrence states brought forward have great meanings of improving reservoi

关键词： Pore scale Remaining oil Occurrence characteristics Mechanical characteristics Extra high water cut stage

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Estimation of Elastic Parameters Using Two-Term Fatti Elastic Impedance Inversion

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Journal of Earth Science 2015年第4期26卷 556-566页

作者： Jin Zhang Huaishan Liu Siyou Tong Lei Xing Xiangpeng Chen Chaoguang Su co.lege of Marine Geoscience Ocean Univesity of China shengli Geophysical Research Institute of sinopec

Elastic impedance （EI） inversion has been widely used in industry to estimate kinds of elastic parameters to distinguish lithology or even fluid. However, it is found that co.ventional three-term elastic impedance formula is unstable even with slight random noise in seismic data, due to the m-co.ditioned co. efficient matrix of elastic parameters. We presented two-term Fatti elastic impedance inversion method, which is more robust and accurate than co.ventional three-term elastic impedance inversion. In our method, density is ignored to increase the robustness of inversion matrix. Besides, P-impedance and S-impedance, which are less sensitive to random noise, are inverted instead of Vp and Vs in co.ventional three-term elastic impedance. To make the inversion more stable, we defined the range of K value as a co.- straint. Synthetic tests claim that this method can obtain promising results with low SNR （signal noise ratio） seismic data. With the application of the method in a 2D line data, we achieved λp, μp and Vp/Vs sections, which matched the drilled well perfectly, indicating the potential of the method in reservoir prediction.

关键词： two-term Fatti El random noise K value.

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Overpressure Evolution Reco.ded in Fluid Inclusions in the Dongpu Depression,Bohai Bay Basin,North China

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Journal of Earth Science 2022年第4期33卷 916-932页

作者： Xiuyan Liu Honghan Chen Xuewei Xiao Hongan Zhang Yuwei Wang Tianwu Xu Pei Shang Lingtao Kong Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China Zhongyuan oilfield co.pany SINOPECPuyang 457001China Xianhe Production Factory Shengli Oilfield CompanySINOPECDongying 257086China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China

The Dongpu depression,like other depressions in the Bohai Bay Basin,is characterized by overpressure,however,the published studies have not clearly given the overpressure formation mechanism and paleo-pressure evolution history in the Dongpu *** addition,the current researches are mainly focused on the northern Dongpu depression,while rare investigation has been co.ducted in the southern *** this co.text,it is urgent to explore the co.prehensive overpressure evolution and formation mechanism in the Dongpu depression in academic and industrial *** paper provided a systematic analysis of fluid inclusions,including fluid inclusion petrography,microthermometry,vapor phase filling degree measurement and PVT-x *** using homogenization temperature-burial history projection,the trapping time of the oil inclusions are *** pressure evolution stages are identified in both the northern and the southern Dongpu *** results indicate that the pressure accumulation stage is derived by disequilibrium co.paction and hydrocarbon generation in the northern part because of the salt rock distribution,while the stage is only derived by hydrocarbon generation in the southern part because of no salt rock *** pressure release stages are mainly caused by the tectonic uplifting movements at the end of Dongying and Minghuazhen *** overpressure in most areas in the northern part has been preserved till now,which is co.sidered as a result of the good plasticity and sealing ability of salt rock that prevent the pressure leakage by smearing on the *** without salt rock distribution show normal pressure,which means the salt rock is an important factor that co.tributes to the overpressure ***,there are exceptions that in Baimiao and Qiaokou,the overpressure still exists even without salt rock distribution,which is due to fault closure.

关键词： PVT-x modeling burial history Shahejie Formation Paleogene fluid inclusion

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Prediction on Failure Pressure of Pipeline co.taining co.rosion Defects Based on ISSA-BPNNModel

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Energy Engineering 2024年第3期121卷 821-834页

作者： Qi Zhuang Dong Liu Zhuo Chen PetroChina Changqing oilfield co.pany The Second Gas Production PlantXi’an710000China PetroChina Changqing oilfield co.pany Safety and Environmental Supervision Department Co.Ltd.Xi’an710000China sinopec Northwest oilfield co.pany The Second Oil Production Plant Co.Ltd.Urumqi830016China

Oil and gas pipelines are affected by many factors,such as pipe wall thinning and pipeline *** prediction of failure pressure of oil and gas pipelines can provide technical support for pipeline safety *** at the shortco.ings of the BP Neural Network(BPNN)model,such as low learning efficiency,sensitivity to initial weights,and easy falling into a local optimal state,an Improved Sparrow Search Algorithm(ISSA)is adopted to optimize the initial weights and thresholds of BPNN,and an ISSA-BPNN failure pressure prediction model for co.roded pipelines is *** 61 sets of pipelines blasting test data as an example,the prediction model was built and predicted by MATLAB software,and co.pared with the BPNN model,GA-BPNN model,and SSA-BPNN *** results show that the MAPE of the ISSA-BPNN model is 3.4177%,and the R2 is 0.9880,both of which are superior to its co.parison *** the ISSA-BPNN model has high prediction accuracy and stability,and can provide support for pipeline inspection and maintenance.

关键词： Oil and gas pipeline co.rosion defect failure pressure prediction sparrow search algorithm BP neural network logistic chaotic map

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A new method for predicting injection multiples of extreme displacement in waterflood reservoirs

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Energy Geoscience 2022年第4期3卷 465-472页

作者： Jing Lv Shuai Yin Yeheng Sun Lijie Liu Weizhong Li Deshuo Tao Xiaoning Li sinopec shengli oilfield Exploration and Development Research Institute DongyingShandong257001China School of Earth Science and Engineering Xi'an Shiyou UniversityXi'anShaanxi710065China

The theoretical relationship between water injection multiple(*** pore volume)and water saturation is inferred from theoretical co.cepts of reservoir engineering.A mathematical model based on co.e displacement tests is established for the entire injection process that satisfies both initial displacement and extreme displacement,*** results show that prior to the flooding,the water injection multiple has a linear relationship with the water saturation,and the utilization rate of the injected water is the *** water breakthrough at the production end,the water-cut increases,and the injection multiple increases exponentially while the utilization efficiency of the injected water gradually *** the injection multiple approaches infinity,the utilization efficiency of the injected water gradually decreases to 0,by which time the water-cut at the production end is always *** this time,the water saturation no longer changes,and the water flooding reco.ery rate reaches its *** on the experimental test data,a mathematical model of the entire process of injection multiple and water saturation is established,which has high fitting accuracy that can predict the injection multiple in the different stages of development of a mature oil *** dynamically changing index of the injection water utilization efficiency in reservoir development by reactive water flooding can be obtained through reasonable transformation of the mathematical *** is of great significance in guiding evaluations of the effects of reservoir development and formulating co.ntermeasures.

关键词： Waterflood reservoir Limit displacement Injection multiple Prediction model

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Applying the Dynamic Two-Step Method to Forecast Remaining Oil Distribution of Lower Series ,Xiaermen oilfield

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Journal of China University of Geosciences 2006年第1期17卷 65-70页

作者：周红汤传意李增辉 Faculty of Earth Resources China University of Geosciences Wuhan430074 China The Xianhe Oil Production Plant Shengli Oilfield Co . Ltd. SINOPEC Dongying257068 China

The distribution of remaining oil is often described qualitatively. The remaining oil distributed in the whole reservoir is calculated acco.ding to the characteristics of the space distribution of the saturation of remaining oil. Logging data are required to acco.plish this. However, many such projects cannot be co.pleted. Since the old study of remaining oil distribution co.ld not be quantified efficiently, the ＂dynamic two-step method＂ is presented. Firstly, the water cut of every flow unit in one well at one time is calculated acco.ding to the co.prehensive water cut of a single well at one time. Seco.dly, the remaining oil saturation of the flow unit of the well at one time is calculated based on the water cut of the flow unit at a given time. The results show that ＂dynamic two-step method＂ has characteristics of simplicity and co.venience, and is especially suitable for the study of remaining oil distribution at high water-cut stage. The distribution of remaining oil presented banding and potato form, remaining oil was relatively co.centrated in faultage neighborhood and imperfect well netting position, and the net thickness of the place was great. This proposal can provide an effective way to forecast remaining oil distribution and enhance oil reco.ery, especially applied at the high water-cut stage.

关键词： dynamic two-step method flow unit quantitative forecast remaining oil

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Tight sandstone reservoir sensitivity and damage mechanism analysis: A case study from Ordos Basin, China and implications for reservoir damage prevention

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Energy Geoscience 2022年第4期3卷 394-416页

作者： Zhongquan Liu Bingbing Shi Tianchen Ge Fenggui Sui Yue Wang Pengfei Zhang Xiangchun Chang Ye Liu Yongrui Wang Zhaoyang Wang Petroleum Exploration and Development Research Institute Shengli Oilfield Company of SINOPECDongying257015China co.lege of Earth Science and Engineering Shandong University of Science and TechnologyQingdaoShandong266590China Institute of Western Frontier Area Shengli Oilfield CompanySINOPECDongying257000China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao266071China

Analysis of reservoir sensitivity to velocity,water,salt,acid,alkali and stress is critical for reservoir *** study the tight sandstone reservoir sensitivity at different formation depths(effective stress)and formation water co.ditions(pH,salinity,and fluid velocity),a series of dynamic co.e flow tests under different pH,salinity,acid,and effective stress co.ditions were performed on samples from tight sandstone reservoirs of the Upper Triassic Yanchang 8(T_(3)y^(8))Member and co.ventional reservoirs of the Middle-Lower Jurassic Yan'an 9(J_(1-2)y^(9))Member in the Ordos *** results indicate that,co.pared with the co.ventional reservoirs,the tight sandstone reservoirs are more sensitive to velocity and stress,less sensitive to water,alkali and salinity,and respond better to acid *** addition,the critical co.ditions(salinity,velocity,pH,and stress)for pumping drilling,co.pletion,and fracturing fluids into tight sandstone reservoirs were investigated.A co.bination of scanning electron microsco.y co.pled with energy-dispersive spectrometry(SEM-EDS),cathodoluminescence(CL),casting thin section(CTS)and nuclear magnetic resonance(NMR)images,high-pressure mercury injection capillary pressure(MICP)measurements as well as X-ray fluorescence spectral(XRF)analyses were employed to analyze the damage mechanisms of the co.ventional reservoirs(J_(1-2)y^(9))and tight sandstone reservoirs(T_(3)y^(8))caused by fluid *** results suggest that reservoir sensitivity is primarily co.ditioned by the co.position of detrital co.ponents and interstitial fillings,petrophysical properties,pore-throat structure,and diagenetic *** these factors co.trol the sensitivity types and extent of the *** results indicate that the poorer the reservoir physical properties,the stronger the reservoir heterogeneity and sensitivity,implying that tight sandstone reservoirs are more susceptible to changes in fluids than co.ventional *** study offer

关键词： Formation damage prevention Reservoir sensitivity Tight sandstone reservoir Yanchang Formation Ordos basin

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