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Hybrid Sedimentation in Late Permian-Early Triassic in Western Sichuan Basin,China

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Journal of Earth Science 2011年第3期22卷 340-350页

作者：龙胜祥吴世祥李宏涛白振瑞马金钰张华 petroleum exploration & production Research institute SINOPEC

Mixed carbonate-siliciclastic sedimentation is common in the Upper Permian-Lower Tri-assic in the western Sichuan（四川） *** extensional movement was strong in the Late Permian,resulting in differential uplifting of fault *** this period,there was an extensive *** Kangdian（康滇） ancient land progressive uplifted and enlarged,forming the major prove-nance of terrigenous *** Changxingian age,mixed terrigenous-carbonate sedimentation was dis-tributed in the area between Dafeishui（大飞水）-well Dashen（大深）-1-well Shoubao（寿保）-1 and Beichuan（北川）-well Guanji（关基）.The terrigenous clastics sourced from Kangdian ancient land input into the relatively shallow water,resulting in an extensive limited platform-mixing tidal flat where moderate-thick laminated grey limestone,thin muddy limestone and purplish red sandy shale were *** tectonic framework in Feixianguanian（飞仙关） stage was inherited from the Chang-xingian *** hybrid sedimentation was limited to the south of Dujiangyan（都江堰）-Xindu（新都）.In Jialingjiangian（嘉陵江） stage,the palaeogeographic features were also unchanged and two complete transgression-retrogression cycles also *** mixing tidal flat was distributed to the west of Baoxing（保兴）-Ya＇an（雅安）-Hongya（洪雅）-Leshan（乐山）,where purplish red sandstone with thin limestone and shale interbeds and grey-dark grey silty mudstone with limestone were *** carbonates in the mixed facies tract have few primary pores preserved and poorly-developed secondary pores due to the relatively high content of terrigenous clastics,strong compaction and weak ***,they are unfavorable for the development of effective reservoirs.

关键词： mixed carbonate-siliciclastic sedimentation Upper Permian-Lower Triassic mixing tidal flat effective reservoirs western Sichuan basin China.

Geochemical Characteristics and Genetic Types of Natural Gas in the Xinchang Gas Field, Sichuan Basin, SW China

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2200-2213页

作者： WU Xiaoqi LIU Quanyou LIU Guangxiang WANG Ping LI Huaji MENG Qingqiang CHEN Yingbin ZENG Huasheng Wuxi Research institute of petroleum Geology Petroleum Exploration and Production Research InstituteSINOPEC petroleum exploration and production Research institute SINOPEC exploration and Development Research institute Southwest Branch CompanySINOPEC

The molecular compositions and stable carbon and hydrogen isotopic compositions of natural gas from the Xinchang gas field in the Sichuan Basin were investigated to determine the genetic types. The natural gas is mainly composed of methane （88.99%-98.01%）, and the dryness coefficient varies between 0.908 and 0.997. The gas generally displays positive alkane carbon and hydrogen isotopic series. The geochemical characteristics and gas-source correlation indicate that the gases stored in the 5th member of the Upper Triassic Xujiahe Formation are coal-type gases which are derived from source rocks in the stratum itself. The gases reservoired in the 4th member of the Xujiahe Formation and Jurassic strata in the Xinchang gas field are also coal-type gases that are derived from source rocks in the 3rd and 4th members of the Xujiahe Formation. The gases reservoired in the 2nd member of the Upper Triassic Xujiahe Formation are mainly coal-type gases with small amounts of oil-type gas that is derived from source rocks in the stratum itself. This is accompanied by a small amount of contribution brought by source rocks in the Upper Triassic Ma＇antang and Xiaotangzi formations. The gases reservoired in the 4th member of the Middle Triassic Leikoupo Formation are oil-type gases and are believed to be derived from the secondary cracking of oil which is most likely to be generated from the Upper Permian source rocks.

关键词： natural gas geochemical characteristics genetic types Xinchang gas field western Sichuan Basin

A new mathematical model for horizontal wells with variable density perforation completion in bottom water reservoirs

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petroleum Science 2017年第2期14卷 383-394页

作者： Dian-Fa Du Yan-Yan Wang Yan-Wu Zhao Pu-Sen Sui Xi Xia School of petroleum Engineering China University of Petroleum sinopec petroleum exploration and production Research institute Sinopec Shengli production Plant Shengli Oilfield Branch CompanySinopec

Horizontal wells are commonly used in bottom water reservoirs,which can increase contact area between wellbores and *** are many completion methods used to control cresting,among which variable density perforation is an effective *** is difficult to evaluate well productivity and to analyze inflow profiles of horizontal wells with quantities of unevenly distributed perforations,which are characterized by different *** this paper,fluid flow in each wellbore perforation,as well as the reservoir,was analyzed.A comprehensive model,coupling the fluid flow in the reservoir and the wellbore pressure drawdown,was developed based on potential functions and solved using the numerical discrete ***,a bottom water cresting model was established on the basis of the piston-like displacement ***,bottom water cresting parameters and factors influencing inflow profile were analyzed.A more systematic optimization method was proposed by introducing the concept of cumulative free-water production,which could maintain a balance（or then a balance is achieved）between stabilizing oil production and controlling bottom water *** show that the inflow profile is affected by the perforation *** with denser perforation density at the toe end and thinner density at the heel end may obtain low production,but the water breakthrough time is *** cumulative free-water production as a parameter to evaluate perforation strategies is advisable in bottom water reservoirs.

关键词： Bottom water reservoirs Variable density perforation completion Inflow profile Cresting model Cumulative free-water production

Architecture mode, sedimentary evolution and controlling factors of deepwater turbidity channels： A case study of the M Oilfield in West Africa

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petroleum Science 2017年第3期14卷 493-506页

作者： Wen-Biao Zhang Tai-Zhong Duan Zhi-Qiang Liu Yan-Feng Liu Lei Zhao Rui Xu petroleum exploration and production Research institute SINOPEC Beijing 100083 China

Turbidity channels have been considered as one of the important types of deepwater reservoir, and the study of their architecture plays a key role in efficient development of an oil field. To better understand the reservoir architecture of the lower Congo Basin M oilfield, semiquantitative–quantitative study on turbidity channel depositional architecture patterns in the middle to lower slopes was conducted with the aid of abundant high quality materials（core, outcrop, logging and seismic data）,employing seismic stratigraphy, seismic sedimentology and sedimentary petrography methods. Then, its sedimentary evolution was analyzed accordingly. The results indicated that in the study area, grade 3 to grade 5 architecture units were single channel, complex channel and channel systems, respectively. Single channel sinuosity is negatively correlated with the slope, as internal grains became finer and thickness became thinner from bottom to top, axis to edge. The migration type of a single channel within one complex channel can be lateral migration and along paleocurrent migration horizontally, and lateral,indented and swing stacking in section view. Based on external morphological characteristics and boundaries,channel systems are comprised of a weakly confining type and a non-confining type. The O73 channel system can be divided into four complex channels named S1–S4, from bottom to top, with gradually less incision and more accretion. The study in this article will promote deeper understanding of turbidity channel theory, guide 3D geological modeling in reservoir development and contribute to efficient development of such reservoirs.

关键词： Reservoir architecture Turbidity channelSedimentary evolution Deep water Shallow seismicControlling factors

Construction and application of an ontology-based domain-specific knowledge graph for petroleum exploration and development

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Geoscience Frontiers 2023年第5期14卷 373-383页

作者： Xianming Tang Zhiqiang Feng Yitian Xiao Ming Wang Tianrui Ye Yujie Zhou Jin Meng Baosen Zhang Dongwei Zhang petroleum exploration and production Research institute SINOPECBeijing 102206China

The massive amount and multi-sourced,multi-structured data in the upstream petroleum industry impose great challenge on data integration and smart *** graph,as an emerging technology,can potentially provide a way to tackle the challenges associated with oil and gas big *** paper proposes an engineering-based method that can improve upon traditional natural language processing to construct the domain knowledge graph based on a petroleum exploration and development *** exploration and development knowledge graph is constructed by assembling sinopec’s multi-sourced heterogeneous database,and millions of *** two applications based on the constructed knowledge graph are developed and validated for effectiveness and advantages in providing better knowledge services for the oil and gas industry.

关键词： Knowledge Graph petroleum exploration and development Natural language processing Ontology

Displacement characteristics of CO_(2)flooding in extra-high water-cut reservoirs

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Energy Geoscience 2024年第1期5卷 212-218页

作者： Rui Wang Yaxiong Zhang Chengyuan Lyu Zengmin Lun Maolei Cui Dongjiang Lang sinopec petroleum exploration and production Research institute BeijingChina

Carbon dioxide(CO_(2))flooding is a widely applied recovery method during the tertiary recovery of oil and gas.A high water saturation condition in reservoirs could induce a‘water shielding’phenomenon after the injection of CO_(2).This would prevent contact between the injected gas and the residual oil,restricting the development of the miscible zone.A micro-visual experiment of dead-end models,used to observe the effect of a film of water on the miscibility process,indicates that CO_(2)can penetrate the water film and come into contact with the residual oil,although the mixing is significantly ***,the dissolution loss of CO_(2)at high water-cut conditions is not *** oil-water partition coefficient,defined as the ratio of CO_(2)solubility in an oil-brine/two-phase system,keeps constant for specific reservoir conditions and changes little with an injection *** NMR device shows that when CO_(2)flooding follows water flooding,the residual oil decreasesdnot only in medium and large pores but also in small and micro *** levels of higher water saturation,CO_(2)displacement is characterized initially by a low oil production rate and high *** the CO_(2)breakthrough,the water-cut decreases sharply and the oil production rate increases *** response time of CO_(2)flooding at high watercut reservoirs is typically delayed and *** results were confirmed in a pilot test for CO_(2)flooding at the P1-1 well group of the Pucheng *** from this pilot study also suggest that a larger injection gas pore volume available for CO_(2)injection is required to offset the dissolution loss in high water saturation conditions.

关键词： Displacement characteristics CO_(2)flooding Water shield phenomenon Oil-water partition coefficient Response time High water-cut

Multiscale Stategies in Automatic Image-Domain Waveform Tomography

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Journal of Earth Science 2015年第4期26卷 577-585页

作者： Yujin Liu Zhenchun Li Department of Geophysics China University of Petroleum exploration & production Research institute SINOPEC

Multiscale strategies are very important in the successful application of waveform-based velocity inversion. The strategy that sequentially preceeds from long to short scale of velocity model, has been well developed in full waveform inversion （FWI） to solve the local mininum problem. In contrast, it＇s not well understood in the image-domain waveform tomography （IWT）, which back-projects incoherent waveform components of the common image gather into velocity updates. IWT is less prone to local minimum problem but tends to build long-scale model with low resolution. In order to build both long- and short-scale model by IWT, we discuss several multiscale strategies restricted in the image domain. The strategies include model reparameterization, objective function switching and gradient rescaling. Numerical tests on Marmsousi model and real data demonstrate that our proposed multiscale IWT is effective in buidling velocity model with wide wavenumber spectrum.

关键词： velocity estimation waveform inversion tomography multiscale inversion common image gather.

From molecular dynamics to lattice Boltzmann:a new approach for pore-scale modeling of multi-phase flow

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petroleum Science 2015年第2期12卷 282-292页

作者： Xuan Liu Yong-Feng Zhu Bin Gong Jia-Peng Yu Shi-Ti Cui College of Engineering Peking University sinopec petroleum exploration and production Research institute Petrochina Tarim Oilfield exploration and production Research institute

Most current lattice Boltzmann （LBM） models suffer from the deficiency that their parameters have to be obtained by fitting experimental results. In this paper, we propose a new method that integrates the molecular dynamics （MD） simulation and LBM to avoid such defect. The basic idea is to first construct a molecular model based on the actual components of the rock-fluid system, then to compute the interaction force between the rock and the fluid of different densities through the MD simulation. This calculated rock-fluid interaction force, combined with the fluid-fluid force determined from the equation of state, is then used in LBM modeling. Without parameter fitting, this study presents a new systematic approach for pore-scale modeling of multi-phase flow. We have validated this ap- proach by simulating a two-phase separation process and gas-liquid-solid three-phase contact angle. Based on an actual X-ray CT image of a reservoir core, we applied our workflow to calculate the absolute permeability of the core, vapor-liquid H20 relative permeability, and capillary pressure curves.

关键词： Molecular dynamics - Lattice BoltzmannMulti-phase flow Core simulation

Genetic mechanisms of high-quality tight siliciclastic reservoirs:A case study from the Upper Triassic Xujiahe Formation in the Yuanba area,Sichuan Basin,China

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Energy Geoscience 2024年第3期5卷 151-162页

作者： Ai Wang Junlong Liu Zhongqun Liu Kaihua Xiao Yanqing Huang Lingxiao Fan Jitong Li petroleum exploration and production Research institute SINOPECBeijing100083China

This study analyzed the petrological characteristics,diagenesis,pore types,and physical properties of the tight coarse-grained siliciclastic sequences in the third member of the Upper Triassic Xujiahe Formation(also referred to as the Xu-3 Member)in the western Yuanba area in the northeastern Sichuan Basin,China,based on the results of 242.61-m-long core description,292 thin-section observations,scanning electron microscopy(SEM),and 292 physical property *** types and genetic mechanisms of high-quality tight coarse-grained siliciclastic reservoirs in this member was determined *** research objective is to guide the exploration and development of the tight coarse-grained siliciclastic sequences in the Xu-3 *** results of this study are as *** types of high-quality reservoirs are developed in the coarse-grained siliciclastic sequences of the Xu-3 Member,namely the fractured fine-grained sandy conglomerate type and porous medium-grained calcarenaceous sandstone *** energy in the sedimentary environment is the key factor controlling the formation of high-quality *** high-quality reservoirs are developed mainly in the transitional zone with moderately high hydrodynamic energy between delta-plain braided channels and delta-front subaqueous distributary *** dolomitic debris(gravel)content is the main factor affecting the reservoirs’physical *** micritic algal debris and sandy debris in the dolomitic debris(or gravels)tend to recrystallize during burial,forming intercrystalline pores *** the medium-grained calcarenaceous sandstones,intercrystalline pores in the dolomitic debris are formed at the early diagenetic stage,and a pore system consisting of structural fractures connecting intergranular pores,intergranular dissolution pores,and kaolinite intergranular micropores is developed at the late stage of *** formation of intercrystalline pores in dolomite gravels and gravel-edge f

关键词： Tight siliciclastic rock High-quality reservoir Genetic mechanism Xujiahe Formation Northeast Sichuan