Inversion of rock aspect ratio in coal measure strata based on optimization of algorithm and DEM theory model

Yin Shuai, Ding Wen-long, Dai Peng, Wang Ru-yue, Yang Wen-na

doi:10.11764/j.issn.1672-1926.2016.04.0745

Natural Gas Geoscience >

2016 , Vol. 27 >Issue 4: 745 - 753

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.04.0745

Inversion of rock aspect ratio in coal measure strata based on optimization of algorithm and DEM theory model

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1.School of Energy Resources,China University of Geosciences ,Beijing 100083,China;
2.Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism,Ministry of Education,China University of Geosciences,Beijing 100083,China;
3.Key Laboratory for Shale Gas Exploitation and Assessment,Ministry of Land and Resources,China University of Geosciences,Beijing 100083,China;
4.Institute of Porous Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China;
5.Langfang Branch of PetroChina Research Institute of Petroleum Exploration & Development,Langfang 065007,China

Received date: 2015-03-31

Revised date: 2015-07-29

Online published: 2019-09-20

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Abstract

Gas logging abnormality is very common in Taiyuan Formation,Shanxi Formation and Lower Shihezi Formation in Qinshui Basin,which has a high potential for gas exploration.But there is a huge difference in the extent of hydrocarbon accumulation,which is dominated by fracture development degree.Inversion of rock pore aspect ratio has reference value for basic research of hole seam,seismic inversion,physical simulation,gas channel conservation and wellblock optimization.Making a coalbed methane Well in south of Shanxi Formation in Fanzhuang block,Guxian well block of Qinnan as an example,based on optimization algorithm,we extract the matrix mineral and rock skeleton modulus of coal and its roof sandstone and sandy mudstone,then inverse the pore aspect ratio using DEM theory model.It shows,the nearly spherical pore space system is dominant in the studied coal rock;the roof dense clayey sandstone is given priority to micro cracks;there are multiple space systems of pore and fracture in sandy mudstone.The use of this method can effectively identify the formation with fracture development,the coincidence rate was 92%.For sandy shale,sand or mud package type rock,micro cracks mainly exist in the sand, α is negatively related to the porosity of rock,and positively related to shale content in this kind of rock.Regardless of sandstone,mudstone or coal rock,communication or drainage capacity of fracture system is superior to the pore system.When there are good gas source,drainage system,fracture system and preservation conditions,coal-derived gas reservoir will be formed.Study of α has certain reference value in fracture parameters extraction,rock ability of saving gas,pore communication ability,permeability ability,and gas channel conservation accumulation etc,and it has positive significance to guide CBM or coal-derived gas exploration and development.

Key words： Optimization algorithm; DEM theory model; Aspect ratio; Inversion; Coal; Tight sandstone; Mudstone

Cite this article

Yin Shuai, Ding Wen-long, Dai Peng, Wang Ru-yue, Yang Wen-na . Inversion of rock aspect ratio in coal measure strata based on optimization of algorithm and DEM theory model[J]. Natural Gas Geoscience, 2016 , 27(4) : 745 -753 . DOI: 10.11764/j.issn.1672-1926.2016.04.0745

References

［1］Dai Jinxing,Ni Yunyan,Huang Shipeng,et al.Significant function of coal-derived gas study for natural gas industry development in China[J].Natural Gas Geoscience,2014,25 (1):1-17.[戴金星,倪云燕,黄士鹏,等.煤成气研究对中国天然气工业发展的重要意义[J].天然气地球科学,2014,25(1):1-17.]
[2]Li Hongbing,Zhang Jiajia.Modulus ratio of dry rock based on differential effective medium theory[J].Geophysics,2010,75(2):43-50.
[3]Zhang Chongchong,Wang Yanbin,Ni Xiaoming,et al.The changing laws of dynamic water porosity about the coal reservoir in single phase flow stage[J].Natural Gas Geoscience,2015,26 (1):154-158.[张崇崇,王延斌,倪小明,等.单相水流阶段煤储层动水孔隙度变化规律[J].天然气地球科学,2015,26(1):154-158.]
[4]Liang Jianshe,Wang Cunwu,Liu Yinghong,et al.Study on the tight gas accumulation conditions and exploration potential in the Qinshui Basin[J].Natural Gas Geoscience,2014,25 (10):1509-1517.[梁建设,王存武,柳迎红,等.沁水盆地致密气成藏条件与勘探潜力研究[J].天然气地球科学,2015,25(10):1509-1517.]
[5]Yao Boyuan,Li Deping.Features and correct application of coal vitrinite reflectance index[J].Journal of Coal Science & Engineering,2012,18(4):400-404.
[6]Mavko G,Mukerji T,Dvorkin J.The rock physics handbook:Tools for Seismic Analysis in Porous Media[M].London:Cambridge University Press,1998.
[7]Breeyman J G,Berge P A.Critique of two explicit schemes for estimating elastic properties ofmultiphase composites[J].Mechanical.Materials,1996,22(2):149-164.
[8]Yong Shihe,Zhang Chaomo.LoggingData Processing and Comprehensive Interpretation[M].Dongying:China University of Petroleum Press,2007.[雍世和,张超谟.测井数据处理与综合解释[M].东营:中国石油大学出版社,2007.]
[9]Lin Kai,He Zhenhua,Xiong Xiaojun,et al.S-wave velocity inversion based on adaptive extraction of matrix mineral modulus[J].Oil Geophysics Prospect,2013,48(2):262-266.[林凯,贺振华,熊晓军,等.基于基质矿物模量自适应提取横波速度反演方法[J].石油地球物理勘探,2013,48(2):262-266.]
[10]Tang Xiaoming,Qian Yuping,Chen Xuelian.Laboratory study of elastic wave theory for a cracked orous medium using ultrasonic velocity data of rock samples[J].Chinese Journal of Geophysics,2013,56(12):4226-4232.[唐晓明,钱玉萍,陈雪莲.孔隙、裂隙介质弹性波理论的实验研究[J].地球物理学报,2013,56(12):4226-4232.]
[11]Hudson J A.Wave speeds and attenuation of elastic waves in material containing cracks[J].Geophysical Journal Royal Astronomical Society,1981,64(1):133-149.
[12]Berryman J G.Single-scattering approximations for coefficients in Biot’s equations of poroelasticity[J].The Journal of the Acoustical Society of America,1992,91(2):551-571.
[13]Robert G K,Shiyu Xu.An approximation for the Xu-White velocity[J].Geophysics,2002,67(5):1406-1414.
[14]Schlumberger Logging Company.Logging Interpretation Common Mineral Rock Handbook[M].Beijing:Petroleum Industry Press,1998.[斯伦贝谢测井公司.测井解释常用岩石矿物手册[M].北京:石油工业出版社,1998.]
[15]Li Hongbing,Zhang Jiajia.Elastic moduli of dry rocks containing spheroidal pores based on differential effective medium theory[J].Journal of Applied Geophysics,2011,75(4):671-678.
[16]Li Hongbing,Zhang Jiajia,Yao Fengchang.Inversion of effective pore aspect ratios for porous rocks and its applications[J].Chinese Journal of Geophysics,2013,56(2):608-614.[李宏兵,张佳佳,姚逢昌.岩石的等效孔隙纵横比反演及其应用[J].地球物理学报,2013,56(2):608-614.]
[17]Li Hongbing,Zhang Jiajia.Analytical approximations of bulk and shear moduli for dry rock based on the differential effective medium theory[J].Geophys.Prospect,2012,60(2):281-292.
[18]Bai Junyu,Song Zhixiang,Su Ling,et al.Error analysis of shear-celocity prediction by the Xu-White model[J].Chinese Journal of Geophysics,2012,55(2):589-594.[白俊雨,宋志翔,苏凌,等.基于Xu-White模型横波速度预测的误差分析[J].地球物理学报,2012,55(2):589-594.]
[19]Budiansky B.On the elastic moduli of some heterogeneous materials[J].Journal of the Mechanics and Physics of Solids,1965,13(4):223-226.
[20]Dong Ning,Huo Zhizhou,Sun Zandong,et al.An investigation of a new rock physics model for shale[J].Chinese Journal of Geophysics,2014,57(6):1990-1997.[董宁,藿志周,孙赞东,等.泥页岩岩石物理建模研究[J].地球物理学报,2014,57(6):1990-1997.]
[21]Meng Qiaorong,Zhao Yangsheng,Hu Yaoqing,et al.Experimental study on pore structure and pore shape of coking coal[J].Journal of China Coal Society,2011,36(3):487-490.[孟巧荣,赵阳升,胡耀青,等.焦煤孔隙结构形态的实验研究[J].煤炭学报,2011,36(3):487-490.]
[22]Li Wei,Yao Huifang,Liu Hongfu,et al.Advanced characterization of three-dimensional pores in coals with different coal-body structure by micro-CT[J].Journal of China Coal Society,2014,39(6):1127-1131.[李伟,要惠芳,刘鸿福,等.基于显微CT的不同煤体结构煤三维孔隙精细表征[J].煤炭学报,2014,39(6):1127-1131.]
[23]Yin Shuai,Shan Yuming,Zhou Wen,et al.Application of failure criterion equation in deep rock’s mechanical strength response[J].Progress in Geophysics,2014,29(6):2942-2949.[尹帅,单钰铭,周文,等.破裂准则方程在深层岩石力学强度响应中的应用[J].地球物理学进展,2014,29(6):2942-2949.]
[24]Yujie Wei,Lallit Anand.On micro-cracking,inelastic dilatancy,and the brittle-ductile transition in compact rocks:A micro-mechanical study[J].Solids and Structures,2008,45:2785-2798.
[25]Yan J,Lubbe R,Pillar N.VariableAspect Ratio Method in the Xu-White Model for AVO[C].EAGE 69^th Conference& Exhibition,London,2007.

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