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《Acta Petrologica Sinica》 2016-03
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A study of fracture development,controlling factor and property modeling of deep-lying tight sandstone in Cretaceous thrust belt K region of Kuqa depression

WANG ZhengYu;LIU Chao;ZHANG YunFeng;QU HaiZhou;YANG XiangTong;LIU HongTao;School of Geoscience and Technology,Southwest Petroleum University;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation;Tarim Oilfield Company,PetroChina;  
In order to find out a solution of fracture prediction of tight sandstone gas reservoir. The paper taking the K region of Kuqa depression as an example,provides a method of property modeling which is based on the elaboration of nature tight sandstone,and offer a new thought of fracture prediction. First,based on the explained model of core and imaging logging,the research obtains a large amount of fracture parameter data by grid method,including fracture extension length( 2 ~ 1850mm),fracture density( avg.0. 53 / m),fracture width( concentrated distribution 0. 1 ~ 0. 4mm),dip angle( 56° ~ 82°),and fissture's area rate( 0. 016% ~0. 083%). Structure parts vary mainly because of the different of geologic structure,layer thickness and strata depth. The development regularity of fractures is different in different tectonic position. The tension fractures are longer and wider in anticlinal core,while X fractures developed in flank of anticlinal are short,narrow and sparse,and the high angle fracture's density is higher near fault point.Layer thickness causes that the fractures in thin layer,moderately thick layer,thick layer and blocky layer decrease in turn. Mineral brittleness decreases toughness enhancement of aiming formation( 6000m) in K region with the burial depth increasing. When more than critical point( 7100m),the development of the fractures weakens gradually. Under the basic study of elaborate fracture data,structure data and level data,the research builds the model of fracture density and fissure's area rate with Petrel. At last,research makes an exploratory study of the correlation between fracture and permeability,and achieve to a quantitative prediction of permeability in K region through fracture parameter fitting permeability models.
【Fund】: 国家科技重大专项(2011ZX05004-004);; 国家自然科学基金项目(41472103);; 四川省教育厅科研基金(14ZB0058)联合资助
【CateGory Index】: P618.13
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