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Identification of the Quaternary low gas-saturation reservoirs in the Sanhu area of the Qaidam Basin,china

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petroleum Science 2011年第1期8卷 49-54页

作者： Li Xiongyan Li Hongqi Zhou Jinyu He Xu Chen Yihan Yu Hongyan State Key Laboratory of petroleum Resource and Prospecting China University of PetroleumBeijing 102249China Key Laboratory of Earth Prospecting and Information Technology China University of PetroleumBeijing 102249China Department of Computer Science and Technology China University of PetroleumBeijing 102249China exploration and development institute Changqing Petroleum CompanyShaanxi 710021China

Low gas-saturation reservoirs are gas bearing intervals whose gas saturation is less than 47%. They are common in the Quaternary of the Sanhu area in the Qaidam *** to the complex genesis mechanisms and special geological characteristics,the logging curves of low gas-saturation reservoirs are characterized by ambiguity and diversity,namely without significant log response characteristics. Therefore,it is particularly difficult to identify the low gas-saturation reservoirs in the study *** addition,the traditional methods such as using the relations among lithology,electrical property,physical property and gas bearing property,as well as their threshold values,can not effectively identify low gas-saturation *** solve this problem,we adopt the decision tree,support vector machine and rough set methods to establish a predictive model of low gas-saturation reservoirs,which is capable of classifying a mass of multi-dimensional and fuzzy *** to the transparency of learning processes and the understandability of learning results,the predictive model was also revised by absorbing the actual reservoir *** applications indicate that the predictive model is effective in identifying low gas-saturation reservoirs in the study area.

关键词： Sanhu area Qaidam Basin low gas-saturation reservoir decision tree support vector machine rough set predictive model identification

用层序地层学构建辫状河三角洲岩性油藏地质模型

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石油学报 2004年第5期25卷 29-33页

作者：方杰赵力民赵太良刘建军中国石油勘探开发研究院北京100083 华北油田勘探开发研究院河北任丘062552

近期在冀中坳陷饶阳凹陷留西地区下第三系沙三段新发现的岩性油藏是较典型的辫状河三角洲砂岩岩性油藏。应用层序地层学原理 ,对该地区层序地层进行了划分 ,建立了地震等时格架。综合分析各项资料结果表明 :留西地区下第三系沙三段为一... 详细信息

近期在冀中坳陷饶阳凹陷留西地区下第三系沙三段新发现的岩性油藏是较典型的辫状河三角洲砂岩岩性油藏。应用层序地层学原理 ,对该地区层序地层进行了划分 ,建立了地震等时格架。综合分析各项资料结果表明 :留西地区下第三系沙三段为一个三级层序 ,发育低位、湖侵和高位 3个完整的体系域。通过大量的岩心观察、岩电组合特征分析和识别 ,将辫状河三角洲前缘亚相划分出分流水道、分流河口坝和楔状砂等沉积微相。用Jason等多种地震反演方法识别出辫状河三角洲的平面形态和空间展布 ,预测出辫状河三角洲的前缘亚相的储集性能 ,指出了有利的储集相带。对留西地区辫状河三角洲砂体形成的沉积环境、构造背景、砂体类型等岩性油藏的成藏条件进行了系统剖析 ,构建了该区岩性油藏的成藏地质模型。

关键词：留西地区层序地层学辫状河三角洲岩性油藏地质模型

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广义水驱特征曲线公式的推导

新疆石油地质 1996年第3期17卷 260-265页

作者：俞启泰中国石油天然气总公司石油勘探开发科学研究院

利用经典的水驱特征曲线公式推导了广义水驱特征曲线公式。广义水驱特征曲线既可以对应多条累积产油量与含水率关系的水驱特征曲线，又可以反映水驱油田不同的含水上升规律，可用于描述及预测水驱油田含水率的变化、双积水油比的变化以... 详细信息

利用经典的水驱特征曲线公式推导了广义水驱特征曲线公式。广义水驱特征曲线既可以对应多条累积产油量与含水率关系的水驱特征曲线，又可以反映水驱油田不同的含水上升规律，可用于描述及预测水驱油田含水率的变化、双积水油比的变化以及计算可采储量，尤其是计算逐年的可采储量，因而有较高的理论及实际应用价值。

关键词：采油工程石油水驱曲线公式可采储量

Effect of stress sensitivity on displacement efficiency in CO_2 flooding for fractured low permeability reservoirs

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petroleum Science 2009年第3期6卷 277-283页

作者： Wang Rui Yue Xiang＇an Zhao Renbao Yan Pingxiang Dave Freeman Key Laboratory of petroleum Engineering Ministry of Education China University of Petroleum Beijing 102249 China SINOPEC exploration ＆ Production research institute Beijing 100083 China china Power Complete Equipment Co. Ltd. Beijing 100011 China Edwy R. Brown Department of petroleum Engineering Marietta College U.S.A.

Carbon dioxide flooding is an effective means of enhanced oil recovery for low permeability reservoirs. If fractures are present in the reservoir, CO2 may flow along the fractures, resulting in low gas displacement efficiency. Reservoir pore pressure will fluctuate to some extent during a CO2 flood, causing a change in effective confining pressure. The result is rock deformation and a reduction in permeability with the reduction in fracture permeability, causing increased flow resistance in the fracture space. Simultaneously, gas cross flowing along the fractures is partially restrained. In this work, the effect of stress changes on permeability was studied through a series of flow experiments. The change in the flowrate distribution in a matrix block and contained fracture with an increase in effective pressure were analyzed. The results lead to an implicit comparison which shows that permeability of fractured core decreases sharply with an increase in effective confining pressure. The fracture flowrate ratio declines and the matrix flowrate ratio increases. Fracture flow will partially divert to the matrix block with the increase in effective confining pressure, improving gas displacement efficiency.

关键词： Stress sensitivity flowrate distribution matrix fracture CO2 flooding displacement efficiency

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幂律非牛顿流体平面流动的数值计算

石油学报 2004年第3期25卷 75-78页

作者：刘明新沈平平袁江如中国石油勘探开发研究院北京100083

提出了一种对非牛顿流体在微观孔道中流动进行模拟计算的改进方法 ,该方法较以往的方法快速而稳定 ,从而为进行大量数值实验提供了精确而有效的手段。首先对描述不可压缩幂律流体二维流动的偏微分方程组进行变换 ,形成流函数涡度方程... 详细信息

提出了一种对非牛顿流体在微观孔道中流动进行模拟计算的改进方法 ,该方法较以往的方法快速而稳定 ,从而为进行大量数值实验提供了精确而有效的手段。首先对描述不可压缩幂律流体二维流动的偏微分方程组进行变换 ,形成流函数涡度方程组以减少未知量个数。在对微分方程组进行差分离散化的过程中 ,用不定常解法求解定常问题 ,对平流项采用迎风格式 ,用 3次样条求解速度场 ,用自动参数超松弛迭代求解流函数场。利用这一系列改进措施 ,获得了稳定快速的求解格式。给出了导出方法、计算公式以及程序框图 ,还给出了实际算例的计算结果。

关键词：非牛顿流体幂律流体微管道流动孔隙网络模型数值计算

论侧钻水平井是开采“大尺度”未波及剩余油最重要的技术

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石油学报 2001年第4期22卷 44-48页

作者：俞启泰中国石油勘探开发研究院北京100083

开采“大尺度”未波及剩余油是提高油田采收率研究战略的第一步。从三方面论证了侧钻水平井是开采成熟油田“大尺度”未波及剩余油最重要的技术这一观点 :1侧钻水平井是开采成熟油田“大尺度”未波及剩余油主要富集区的主要技术 ;2侧钻... 详细信息

开采“大尺度”未波及剩余油是提高油田采收率研究战略的第一步。从三方面论证了侧钻水平井是开采成熟油田“大尺度”未波及剩余油最重要的技术这一观点 :1侧钻水平井是开采成熟油田“大尺度”未波及剩余油主要富集区的主要技术 ;2侧钻水平井可钻达油层中任何部位的“大尺度”未波及剩余油富集区 ;3侧钻水平井比钻垂直井和常规水平井费用低得多、更加经济。指出 ,侧钻水平井有极广阔的应用前景 ,因此应使这项技术成为一种高效的、经济的、配套的常规技术 ,研究的目标是增强效果和降低成本。

关键词：成熟油田侧钻水平井剩余油常规技术经济评价

Influence of valence electron structures of phase and biphase interfaces of sulfides on hot brittleness in steel

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Science china(Technological Sciences) 2004年第4期47卷 488-504页

作者： LIU Yan1,3, LIU Zhilin1, ZHANG Chengwei1,2 & ZHOU Yingchun1 1. Liaoning institute of Technology, Jinzhou 121001, china 2. china National Oil and Gas exploration and development Corporation, beijing 100011, china 3. College of Science, Northeastern University, Shengyang 110006, china Liaoning institute of Technology Jinzhou China College of Science Northeastern University Shengyang China china National Oil and Gas exploration and development Corporation Beijing China

This paper calculates the electron structures of phase of FeS, MnS and their biphase interface electron structures with austenite in steel. The precipitation and the transformation of FeS and MnS are investigated through studying the valence electron pair numbers on the strongest bond n A with the structure formation factor S. The continuity of electron density and its relation with stress are explored in the biphase interfaces with the electron density difference απ Using n A, S, απ we explain the reason why FeS can bring about hot brittleness in steel and the physical mechanism why MnS may eliminate or inhibit hot brittleness, based on which satisfying results are obtained by calculating several rare-earth sulfides.

关键词： valence electron structure, sulfide, hot brittleness, and rare earth.

Numerical modeling of DPSK pressure signals and their transmission characteristics in mud channels

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petroleum Science 2009年第3期6卷 266-270页

作者： Shen Yue Su Yinao Li Gensheng Li Lin Tian Shouceng College of Physics Science and Technology China University of Petroleum Dongying Shandong 257061 China CNPC Drilling research institute Beijing 100083 China State Key Laboratory of petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China

A numerical model and transmission characteristic analysis of DPSK （differential phase shift keying） pressure signals in mud channels is introduced. With the control logic analysis of the rotary valve mud telemetry, a logical control signal is built from a Gate function sequence according to the binary symbols of transmitted data and a phase-shift function is obtained by integrating the logical control signal. A mathematical model of the DPSK pressure signal is built based on principles of communications by modulating carrier phase with the phase-shift function and a numerical simulation of the pressure wave is implemented with the mathematical model by MATLAB programming. Considering drillpipe pressure and drilling fluid temperature profile along drillpipes, the drillpipe of a vertical well is divided into a number of sections. With water-based drilling fluids, the impacts of travel distance, carrier frequency, drillpipe size, and drilling fluids on the signal transmission were studied by signal transmission characteristic analysis for all the sections. Numerical calculation results indicate that the influences of the viscosity of drilling fluids and volume fraction of gas in drilling fluids on the DPSK signal transmission are more notable than the others and the signal will distort in waveform with differential attenuations of the signal frequent component.

关键词： Measurement while drilling (MWD) modulation binary symbol mathematical model numerical simulation differential phase shift keying (DPSK) signal transmission characteristics

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油气成因二元论与油气勘探新准则

新疆石油地质 1996年第4期17卷 303-308页

作者：张恺北京石油天然气总公司石油勘探开发科学研究院

根据板块构造旋回与壳－幔深部油气无机成因的观点，从屋脊式三维空间无机、有机多套油气源叠加、富集的模式出发，从含油气板块构造的选择、含油气盆地的选择、油气勘探目的层的选择、寻找大油气田和油气聚集带、油气勘探程序等５个方... 详细信息

根据板块构造旋回与壳－幔深部油气无机成因的观点，从屋脊式三维空间无机、有机多套油气源叠加、富集的模式出发，从含油气板块构造的选择、含油气盆地的选择、油气勘探目的层的选择、寻找大油气田和油气聚集带、油气勘探程序等５个方面探讨了油气勘探的新准则。这一新的油气勘探准则较之目前单纯建立在油气有机成因说基础上的勘探准则，更能全面地反映了油气成因二元论这一客观现实，因而在勘探实践中应用这些原则将能获得更大的效益。

关键词：有机成因含油气盆地油层勘探程序油气田