Table of Content

08 September 1999, Volume 21 Issue 3

Previous Issue    Next Issue

Brief Report

NUMERICAL MODEL OF RESERVOIR PALEOSTRESS FIELD

Song Huizhen, Zeng Hairong, Sun Junxiu, Liu Jie, Huang Fuqiong

1999, 21(3):  193-204. 

Asbtract ( )   PDF (3718KB) ( )  

Related Articles | Metrics

Based on paleotectonic deformation, a methodology including inverse and forward method is used to investigate reservoir paleostress field. The content is (1) Inverse the boundary forces and local stresses of reservoir paleotectonic surface by use of the thin plate trend model. (2) Use the result from (1) asthe boundary condition, and build a combined element model to calculate reservoir paleotectonic stress field. (3) Use the result from (1) as boundary condition, then build a solid element 3D model with active faults to calculate reservoir paleotectonic stress field. (4) Application and inspection of these 3 models.

METHODS OF RESERVOIR TECTONIC FRACTURE PREDICTION AND ITS APPLICATION

Song Huizhen, Zeng Hairong, Sun Junxiu, Lan Yingang, Huang Fuqiong

1999, 21(3):  205-213. 

Asbtract ( )   PDF (3172KB) ( )  

Related Articles | Metrics

Carbonate reservoir fracture prediction is an important and very complicated problem in oil-gas fields of the world. Through mechanical analyses of structural fractures, this paper presents methods to evaluate fracture strength and orientation of reservoir structures. A case of fracture prediction is studied and inspected. The results show that (1) Using effective tensile stress to evaluate tensile and tensile-shear fractures is valid and practical. (2) To a layer of reservoir, the main factors that give effect to the tensile fracture distribution are curvature and torsion coefficient of paleo-structure surface and fault movement (normal, reverse, or translation). From the bottom to top of paleo upheaval, the tectonic fracture is from tensile to tensile-shear and shear. (3) The structure of tensile or tensile-shear fracture lowers down with depth increasing from the paleo-structure surface. (4) Different fracture prediction models have different characteristics and advantages of themselves. It would be more valid and effective to choose proper prediction model by availability of reservoir information and requirement.

A SPECIAL MODEL FOR THE TIP OF FAULTS

Zeng Hairong, Song Huizhen

1999, 21(3):  215-220. 

Asbtract ( )   PDF (1303KB) ( )  

Related Articles | Metrics

The general jointed element that consists of several pairs of double-node can be only used to the middle parts of faults. This paper presents a special jointed element for the tip of faults and describes a new type of solid element, which is near to the tip of a fault, and is called the special solid element. These two new types of element plus the general jointed element could simulate any fault, which is of any azimuth and limited of strike length. Thus, this model provides a supplement to geomechanic problem and a powerful tool to simulate and investigate the effect of faults on geological structure.

ESTIMATION OF EARTHQUAKE RISK FOR NORTHERN NORTH CHINA BY NUMERICAL MODELING

Liu Jie, Song Huizhen

1999, 21(3):  221-228. 

Asbtract ( )   PDF (2119KB) ( )  

Related Articles | Metrics

Based upon the deep and shallow geological features of northern North China area(39～41°N,114～117°E), a tectonic model is established. With this model the effective stress, the strain energy density and their variations with time are calculated using the 3 D viscoelastic finite element method containing dislocation plane.Deep slip rates of several major active faults are inversed by the dislocation inverse method to provide boundary conditions for the calculations. From the results of modeling, three different potential earthquake areas are proposed:M6 in Zhang jiakou and its north at upper crust, M7 in Yanqing and Huailai basin at middle crust, and M6 in the Yangyuan basin at lower crust.

KINEMATIC FEATURE INVERSION OF THE XINGTAI EARTHQUAKE FAULT

Liu Jie, Song Huizhen

1999, 21(3):  229-237. 

Asbtract ( )   PDF (2516KB) ( )  

Related Articles | Metrics

In this paper, two different fault models in Xingtai area are established, and the uneven slip distributions on the faults caused by the March 8 M6.8 earthquake, the March 22 M6.7 and M7.2 earthquakes and the whole earthquake cluster in Xingtai 1966 are inversed,respectively, by using uneven dislocation inversion method and geodetic data.Then the features of the results are analyzed.

APPLICATION OF DOUBLE NODE FINITE ELEMENT ON SEEPAGE INVOLVING FAULT AND FRACTURE

Zeng Hairong, Song Huizhen

1999, 21(3):  238-242. 

Asbtract ( )   PDF (1198KB) ( )  

Related Articles | Metrics

The concept of three-dimensional double node jointed element in structural analysis is introduced into fluid-flow model, thus a new type of seepage element is defined, which is named double-node seepage element. This element is analyzed from its physical instinct; while its mathematical expression in matrices is also given. The element presented can be used to simulate the effect of fault on seepage field.

THE THEORY OF IMMISCIBLE SATURATED TWO PHASE FLOW IN DEFORMED POROUS MEDIA Ⅰ-A MATHEMATICAL MODEL

Xue Shifeng, Song Huizhen

1999, 21(3):  243-252. 

Asbtract ( )   PDF (2545KB) ( )  

Related Articles | Metrics

Based on the black-oil model in multiphase fluid and the continuum mechanics theory, a theoretical modeling equation of immiscible saturated two phase seepage coupling with deformed porous media is presented. A simple discussion shows that the coupling effect between seepage and rock deformation may be obvious in some cases.

THE THEORY OF IMMISCIBLE SATURATED TWO PHASE FLOW IN DEFORMED POROUS MEDIA Ⅱ-EQUATION UNCOUPLING AND FINITE ELEMENT FORMULATION

Xue Shifeng, Song Huizhen

1999, 21(3):  253-260. 

Asbtract ( )   PDF (1881KB) ( )  

Related Articles | Metrics

By introducing further assumptions to the available model equations, an uncoupling pressure equation of oil-water flow system is presented. For the numerical analysis of partial differential equations, the types of Galerkin weak integration and the corresponding finite element formulations are developed.

STUDY ON THE METHOD OF QUANTITATIVE ANALYSIS OF FISSURE VOLUME DENSITY IN RESERVOIRS

Huang Fuqiong, Song Huizhen, Zeng Hairong, Xiao Chengwen, OU Yangjian

1999, 21(3):  261-267. 

Asbtract ( )   PDF (2083KB) ( )  

Related Articles | Metrics

This paper presents a quantitative analysis method of fissure volume density through strain energy obtained from numerical simulation. The volume density is chosen to be the quantitative analysis parameter, and its calculating method in core is improved. The equations of the relationship between fissure volume density and strain energy in samples are influenced by the confining pressure. On the basis of above results, the relation between the fissure volume density in core and strain energy obtained by numerical simulation are analyzed, by which the quantitative analysis method is set up and has been applied in oilfield production.

NUMERICAL MODELING OF TECTONIC STRESS FIELD IN TARIM BASIN AND ITS IMPLICATION TO HYDROCARBON ACCUMULATION

Wang Xishuang, Song Huizhen, Liu Jie

1999, 21(3):  268-274. 

Asbtract ( )   PDF (1967KB) ( )  

Related Articles | Metrics

The 3-D geological model is set up based on the structure and the strata of the Tarim basin. The contemporary tectonic stress field is calculated by using the 3-D finite element method. The different tectonic stress field features at different depths which are caused by both tectonic force and gravity force and the relation between the stress field and hydrocarbon accumulation are analyzed.

A STRESS MODEL OF THRUST FAULTS

Song Huizhen, Zeng Hairong, Denis Heliot, Yan Gongrui

1999, 21(3):  275-282. 

Asbtract ( )   PDF (2586KB) ( )  

Related Articles | Metrics

We study:(1) A nonlinear model of thrust movement-a contact model, (2) The methods of explicit and implicit calculation of thrust stress field, (3) Thrust stress field characteristics from explicit and implicit scheme. We describe a thrust movement model and get stress field near the fault by 2D explicit finite difference method and 3D implicit finite element method, respectively. The results show that (1) the lower part of hanging wall of the thrust is tensile, and the lower part of foot wall is compressive, (2) complicated 3D tectonics can be treated as a series of 2D problems under some limitations, (3) explicit algorithm is better than implicit algorithm when a contact model is used to simulate stress field of active faults.

INTER-CITING ANALYSIS OF CHINESE KEY GEOSCIENCE JOURNALS

Sun Qun, Wang Wenhu

1999, 21(3):  283-284. 

Asbtract ( )   PDF (683KB) ( )  

Related Articles | Metrics

A DESIGN OF OIL ENTERPRISES EARTHQUAKE RESIST AND DISASTER REDUCTION INFORMATION SYSTEM

Zeng Hairong, Xu Pengfei, Song Huizhen, Wang Youlong

1999, 21(3):  285-287. 

Asbtract ( )   PDF (995KB) ( )  

Related Articles | Metrics

A lot of paper materials including texts and pictures have been produced about the earthquake resist and disaster reduction for oil enterprises. The continuing work is asking for an information system which works with network and database because of increasing earthquake activities and the motivation of modern information industrial. This paper analyzes some database productions, presents a general design for oil enterprises earthquake resist and disaster reduction information system, which is built on the general pattern of information management and the requirement to work of earthquake resist and disaster reduction. To realize this system, it is a good resolution method that Microsoft Access is a base, and VB or VC++is used as the visual application development tools. This information system will bring the work of earthquake resist and disaster reduction for oil enterprises into a new stage.

MEETING ON DIRECTI0N OF EARTHQUAKE GEOLOGY OF 21ST CENTURY HELD IN GUIYANG

Din Menlin

1999, 21(3):  314-314. 

Asbtract ( )   PDF (347KB) ( )  

Related Articles | Metrics