Micro-Pore Characteristics and its Control Factors Analysis of Chang81 Reservoir of Huanjiang Area

2014 ◽  
Vol 522-524 ◽  
pp. 1257-1261 ◽  
Author(s):  
Bing Xi Li ◽  
Yuan Ting Cao ◽  
Wen Zhong Ma
Keyword(s):  
Pore Space ◽  
Physical Property ◽  
Low Permeability ◽  
Pore Throat ◽  
Pore Characteristics ◽  
Control Factors ◽  
Factors Analysis ◽  
Micro Cracks ◽  
Pore Types ◽  
Scanning Electron

Micro-pore characteristics and its control factors are analyzed according to mercury penetration, physical property parameters, flake observation and scanning electron microscopy, etc. Studies show that Chang81 reservoir is ultra-low permeability, its main pore types are intergranular pore and feldspar dissolved pore, its main pore throat types are low porosity, fine throat to micro-fine throat. Diagenesis stage of Chang 81 reservoir is situated in the diagenetic stage B. compaction mainly reduce the pore space, while the micro-cracks caused by compaction can be good reservoir space; ferrocalcite cement, Chlorite coating and kaolinite would destroy the reservoir space by filling in the primary pores and secondary pores; hydration of feldspar would destroy the reservoir space, while dissolution of feldspar would improve the reservoir space; dissolution of feldspar is the most favorable diagenesis.

Movable Fluid Saturation of Low-Permeability and Tight Sandstone Oil Reservoir: Taking Chang 6 Reservoir in Banqiao-Heshui Area as an Example

2015 ◽  
Vol 1092-1093 ◽  
pp. 1420-1423
Author(s):  
Lei Cao ◽  
Wei Sun ◽  
Rui Niu ◽  
Lei Huo ◽  
Fu Tao Qu ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Pore Space ◽  
Physical Property ◽  
Low Permeability ◽  
Oil Reservoir ◽  
Distribution Characteristics ◽  
Tight Sandstone ◽  
Thin Sections ◽  
Fluid Saturation ◽  
Pore Types

By analyzing the thin sections, physical property and nuclear magnetic resonance, the petrology character, pore types and the movable fluid saturation distribution characteristics of Chang 6 reservoir in Banqiao-Heshui area were tested. The research shows that the main lithology of Chang 6 reservoir in study area is lithic arkose. The pore space of reservoir mainly include the solution pores and the primary residual intergranular pores. Fine pore-tiny throat is the main pore configuration. The physical properties of Chang 6 reservoir in Banqiao-Heshui area are weak and it belongs to low-permeability and porosity oil reservoir. There are two models of T2 spectrum, including bimodal and unimodal modes. Movable fluid saturation and fluid porosity varies a lot, the reservoir can be classified as many types by movable fluid saturation and for each of them, its movable fluid saturation differs obviously.

Research on Diagenetic Facies Based on Diagenetic Effect in the Low Permeability Sandstone Reservoir - A Case from C81 Reservoir in Huanjiang Region, Ordos Basin

2014 ◽  
Vol 522-524 ◽  
pp. 1274-1279
Author(s):  
Chun Wang ◽  
Zhi Guo Jin ◽  
Cheng Zhi Liu
Keyword(s):  
Physical Properties ◽  
Ordos Basin ◽  
Physical Property ◽  
Low Permeability ◽  
Thin Sections ◽  
Diagenetic Minerals ◽  
Calcite Cementation ◽  
Diagenetic Facies ◽  
Pore Types ◽  
Feldspar Dissolution

The research is carried out on diagenetic minerals, pore types and its impact on the physical properties in Huanjiang C81reservoir of Ordos basin, which is based on reservoir physical property test, thin sections observation and scanning electron microscopy. Several minerals closely associated with reservoir physical properties are identified from diagenetic effect views. It results in that a classification is proposed for the diagenetic facies, consisting of four kinds of diagenetic facies: ferroan calcite cementation facies, hydromica/kaolinite cementation facies, chlorite coating facies and feldspar dissolution facies. The study of C81reservoir in Huanjiang region shows that this scheme is favorable to estimate low permeability reservoir, the result shows fairly good consistency with the distribution of physical property of wells.

scholarly journals Physical Property and Origin of Lowly Permeable Sandstone Reservoir in Chang 2 Division, Zhang-Han Oilfield, Ordos Basin

2009 ◽  
Vol 27 (5) ◽  
pp. 367-389 ◽  
Author(s):  
Chao Gao ◽  
Zhenliang Wang ◽  
Jie Deng ◽  
Jinghui Zhao ◽  
Xianchao Yang
Keyword(s):  
Pore Space ◽  
Ordos Basin ◽  
Physical Property ◽  
Asymmetric Distribution ◽  
Porosity Evolution ◽  
Key Factor ◽  
Northern Shaanxi ◽  
Sandstone Reservoirs ◽  
Diagenetic Facies ◽  
Pore Types

Lowly permeable sandstone reservoirs play an important role in the exploration and exploitation of natural gas and petroleum in China. The reservoirs are major lowly permeable sandstone reservoirs in Chang 2 division, Yanchang Formation, Upper Triassic in Zhang-Han oilfield, which located in the northern Shaanxi slope of Ordos Basin. According to the distribution and composition of sand beds, integrated measured physical properties, micro-pore structure analysis, cast thin section observation, scanning electron microscopy, the impacts of deposition and diagenesis on porosity evolution are analyzed. The essential diagenesis causing the porosity loss is evaluated quantitatively, and finally the origin mechanisms of low permeability reservoir in Zhang-Han oilfield are discussed. The results show: (1) Fine particle and low compositional maturity arkose are the material foundation of the formation of poor physical property sandstone; (2) The main pore space of reservoir is secondary pores. There are two types of combined pores that including dissolve-residual pores and dissolve-micropores. The porosity values display an approximately normal distribution, and permeability values are asymmetric distribution of the logarithm in lowly permeable sandstones. Their correlation coefficient becomes more and more worse with the decrease of permeability; (3) There are four diagenetic facies, in which three diagenetic facies belong to extra-lowly permeable and ultra-lowly permeable reservoir sandstones and widely distributed, and they are diagenetic lithofacie background of lowly permeability sandstone; (4) In low compositional maturity arkose, its initial porosity is 1/4 lower than conventional reservoir, the secondary and dissolved pores are main pore types of lowly permeable reservoir rocks. It is also a key factor of effective oil-bearing of lowly permeability sandstone.

scholarly journals The Controls of Pore-Throat Structure on Fluid Performance in Tight Clastic Rock Reservoir: A Case from the Upper Triassic of Chang 7 Member, Ordos Basin, China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Yunlong Zhang ◽  
Zhidong Bao ◽  
Fei Yang ◽  
Shuwei Mao ◽  
Jian Song ◽  
...  
Keyword(s):  
Water Saturation ◽  
Pore Space ◽  
Ordos Basin ◽  
Significant Proportion ◽  
Pore Throat ◽  
Tight Sandstone ◽  
Clastic Rock ◽  
Control Factors ◽  
Significant Difference ◽  
The Impact

The characteristics of porosity and permeability in tight clastic rock reservoir have significant difference from those in conventional reservoir. The increased exploitation of tight gas and oil requests further understanding of fluid performance in the nanoscale pore-throat network of the tight reservoir. Typical tight sandstone and siltstone samples from Ordos Basin were investigated, and rate-controlled mercury injection capillary pressure (RMICP) and nuclear magnetic resonance (NMR) were employed in this paper, combined with helium porosity and air permeability data, to analyze the impact of pore-throat structure on the storage and seepage capacity of these tight oil reservoirs, revealing the control factors of economic petroleum production. The researches indicate that, in the tight clastic rock reservoir, largest throat is the key control on the permeability and potentially dominates the movable water saturation in the reservoir. The storage capacity of the reservoir consists of effective throat and pore space. Although it has a relatively steady and significant proportion that resulted from the throats, its variation is still dominated by the effective pores. A combination parameter (ε) that was established to be as an integrated characteristic of pore-throat structure shows effectively prediction of physical capability for hydrocarbon resource of the tight clastic rock reservoir.

The Influence of Micro-Character on Macroscopic Properties in Low Permeability Reservoir

2014 ◽  
Vol 535 ◽  
pp. 631-634
Author(s):  
Yan Zhang ◽  
Lin Fei Lei
Keyword(s):  
Low Permeability ◽  
Displacement Efficiency ◽  
Pore Throat ◽  
Positive Correlation ◽  
Low Permeability Reservoir ◽  
Micro Cracks ◽  
Feature Structure ◽  
Macroscopic Properties ◽  
Oil Displacement Efficiency ◽  
Microscopic Features

The relation of microscopic features and the macroscopic properties such as permeability, porous and oil displacement efficiency in low permeability reservoir is much more complex than in conventional reservoir. Understanding the microscopic features and its influence law to macroscopic properties in low permeability reservoir is key to tapping remain oil. In this paper, the microscopic and macroscopic features and their relationship is studied. Studies suggest that in low permeability reservoir the main reservoir spaces include micro cracks, intergranular pore, intragranular pore and intracrystalline pore. The contribution of micro-cracks to porosity is not big, but its influence to permeability cannot be ignored. Porosity mainly effect by the development degree of pore throat, the bigger radius of pore throats are, the porosity is higher. The permeability and mercury efficiency are affected by feature structure coefficient, which reflect the characteristics of connectivity, it showed a positive correlation between the Coefficient and permeability, but Mercury efficiency and the Coefficient have positive correlation in mesopore reservoir, they have Negative Correlation in low or super-low porosity.

The Characteristics of X Formation Biohermal Reservoir in DMP Structure in Sichuan Basin

2014 ◽  
Vol 962-965 ◽  
pp. 138-141
Author(s):  
Jiang Min Du ◽  
Xiao Li Zhang ◽  
Chao Li ◽  
Yan Qiu Yu ◽  
Xi Zheng ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Pore Space ◽  
Physical Property ◽  
Sedimentary Facies ◽  
Control Factors ◽  
Drilling Data ◽  
Crystalline Dolomite ◽  
Formation And Evolution ◽  
And Control ◽  
Research Show

Based on the logging and drilling data of DMP structure in Sichuan basin.We study the characteristics and control factors of biohermal reservoir of X formation deeply. The research show that the biohermal reservoir is comprised of biohermal dolostone and fine-medium crystalline dolomite mainly;Intergranular pore,dissolved cave and pore space are mainly kinds of reservoir space;The physical property of the reservoir is not very good,with the low porosity and low permeability.Fractures grow well in reservoir, forming a kind of fractured reservoir.The formation and evolution of the reservoir is controlled by the sedimentary facies, tectonization and diagenesis.

scholarly journals Gamma-Ray Attenuation to Evaluate Soil Porosity: An Analysis of Methods

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Luiz F. Pires ◽  
André B. Pereira
Keyword(s):  
Gamma Ray ◽  
Particle Density ◽  
Pore Space ◽  
Physical Property ◽  
Soil Bulk Density ◽  
Soil Porosity ◽  
Porous System ◽  
Soil Pore Space ◽  
Gamma Ray Attenuation ◽  
Dry Soil

Soil porosity (ϕ) is of a great deal for environmental studies due to the fact that water infiltrates and suffers redistribution in the soil pore space. Many physical and biochemical processes related to environmental quality occur in the soil porous system. Representative determinations ofϕare necessary due to the importance of this physical property in several fields of natural sciences. In the current work, two methods to evaluateϕwere analyzed by means of gamma-ray attenuation technique. The first method uses the soil attenuation approach through dry soil and saturated samples, whereas the second one utilizes the same approach but taking into account dry soil samples to assess soil bulk density and soil particle density to determineϕ. The results obtained point out a good correlation between both methods. However, whenϕis obtained through soil water content at saturation and a 4 mm collimator is used to collimate the gamma-ray beam the first method also shows good correlations with the traditional one.

scholarly journals Formation mechanism of authigenic chlorite in tight sandstone and its influence on tight oil adsorption, Triassic Ordos Basin, China

2020 ◽  
Vol 38 (6) ◽  
pp. 2667-2694
Author(s):  
Qianshan Zhou ◽  
Chengfu Lv ◽  
Chao Li ◽  
Guojun Chen ◽  
Xiaofeng Ma ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Formation Mechanism ◽  
Pore Space ◽  
Ordos Basin ◽  
Reservoir Quality ◽  
Tight Oil ◽  
Pressurized Water ◽  
Tight Reservoirs ◽  
Pore Lining ◽  
Scanning Electron

In this study, the formation mechanism of authigenic chlorite in tight reservoirs and its influence on the adsorption capacity to tight oil have been analyzed. The occurrence states of chlorite and the formation mechanism have been analyzed by thin section (TS) and field emission scanning electron microscopy (FE-SEM) measurements. Due to the alteration of volcanic rock fragments, the mudstone pressurized water, and the dissolution of early chlorite, the material source has been provided for the formation of chlorite. The formation time of chlorite with different occurrence states is in the following order: grain-coating chlorite → pore-lining chlorite → pore-lining chlorite in dissolved pores → rosette chlorite. Authigenic chlorite developed in the reservoirs has influenced the change of the reservoir quality in two respects. On the one hand, authigenic chlorite can protect the residual pores, improve the anti-compaction capacity of the reservoir, and provide certain inter-crystalline space. On the other hand, it can hinder pore space and inhibit throat, resulting in a decrease in the connectivity of pores and the increase in the heterogeneity of the reservoir. Tight oil absorbed by the chlorite is mainly in the form of the thin film and aggregates. Through in situ testing of environmental scanning electron microscope (ESEM) and energy dispersive spectrum (EDS), the adsorption capacity of chlorite with different occurrence states to tight oil, being in the following order: rosette chlorite > pore-lining chlorite > pore-lining chlorite in dissolved pores > grain-coating chlorite. Furthermore, the controlling factors on reservoir quality, the content of chlorite and content of Fe and K have been investigated, and the adsorption capacity of different chlorite types has been studied, which can provide guidance for analysis of the control factors on the difference in adsorption capacity of different occurrence states of chlorite to tight oil in tight reservoirs.

Micromorphology of soil structure - Description, quantification, application

Soil Research ◽  
1991 ◽  
Vol 29 (6) ◽  
pp. 777 ◽  
Author(s):  
AJ Ringrose-Voase
Keyword(s):  
Soil Structure ◽  
Pore Space ◽  
Structural Parameters ◽  
Thin Sections ◽  
Physical Measurements ◽  
Undisturbed Samples ◽  
Structure Description ◽  
Management Techniques ◽  
Pore Types ◽  
Soil Behaviour

Micromorphological observation can provide insights into soil structure and aid interpretation of soil behaviour. Undisturbed samples are taken in the field and impregnated. They are used to prepare thin sections or images of the macropore structure using fluorescent photography. Sections can also be obtained at macro, meso and submicroscopic scales. The various elements of soil structure observed micromorphologically can be classified into pore space, physical, distribution and orientation fabrics, and associated structures. Examples of the importance of features in each category are given. Image analysis, especially when computerized, provides a way of parameterizing micromorphological observations. To date it has been used primarily on images of macropore space at the meso and microscopic scales. Such images can be digitized and segmented to show pore space and solid. The pore space can be allocated to pore types. This aids the estimation of 3-D parameters from I-D and 2-D measurements made on the image using stereology. Various ways of using structural parameters to compare structures are discussed. Applications for micromorphological observations, especially when quantitative, include comparison of structures formed by different management techniques. Structural measurements can aid interpretation of soil behaviour as described by physical measurements. They also have a role in estimating the representative elementary volume, on which physical measurements should be made, and in calibrating field estimates of soil structure.

Advance Water-Flooding to Reduce the Stress Sensitivity Affect on Low Permeability Reservoir Development

2011 ◽  
Vol 361-363 ◽  
pp. 520-525
Author(s):  
Jun Feng Yang ◽  
Han Qiao Jiang ◽  
Han Dong Rui ◽  
Xiao Qing Xie
Keyword(s):  
Physical Simulation ◽  
Physical Property ◽  
Stress Sensitivity ◽  
Water Flooding ◽  
Low Permeability ◽  
Formation Pressure ◽  
Exponential Relationship ◽  
Low Permeability Reservoir ◽  
Reservoir Development ◽  
Water Cut

Physical simulation experiments were made to research on the stress sensitivity on physical property of low permeability reservoir rocks. The experimental results shown that effective pressure had good exponential relationship with reservoir permeability. Combining with materaial balance method, reservoir engineering and rational deducation was made to reserach on water-flooding timing of low permeability reservoir development. Several production targets were obtained by these method, such as formation pressure, water and oil production, water cut and so on. The results shown that advanced water-flooding was very important in low permeability reservoir development to reduce the bad impact of stress sensitivity on formation permeability and maintain formation pressure.

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