EXPERIMENTAL RESEARCH ON DISTRIBUTION CHARACTERISTICS AND INFLUENTIAL FACTORS OF P-WAVE VELOCITY FOR ROCKS IN NORTHEAST REGION OF SICHUAN PROVINCE
WANG Guibin，YANG Chunhe，GUO Yingtong，MAO Haijun
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：Mineral composition，microstructure，temperature and confining pressure condition of rocks are crucial factors for determining the P-wave velocity of rocks. 49 kinds of rocks are chosen from the carbonate and sand-shale formations of the important exploration area in northeast region of Sichuan Province. The P-wave velocity is determined under the conditions of room temperature and no confining pressure，room temperature and confining pressure，high temperature and confining pressure. The distribution characteristics and influential factors of P-wave velocity for the rocks in northeast region of Sichuan Province are systematically analyzed. The average values and variation ranges of P-wave velocity for sand-shale formation and carbonate formation are given. Many mathematical models are used to determine the relationship of buried-depth and density with P-wave velocity for sand-shale formation，carbonate formation and whole formation respectively. The optimal regression equation is determined. The main influential factors of P-wave velocity are discussed for sand-shale formation and carbonate formation. The qualitative and quantitative relationships of temperature，confining pressure and formation with P-wave velocity are established；and the primary mechanism is discussed simply. After a comprehensive analysis，it can be realized that the deposition of sand-shale formations is continuous. The microstructure of carbonate formation is complicated and it plays an important role in acoustic response.
王贵宾，杨春和，郭应同，冒海军. 川东北地区岩石纵波速度分布特征和影响因素的试验研究[J]. 岩石力学与工程学报, 2011, 30(S1): 2834-2842.
WANG Guibin，YANG Chunhe，GUO Yingtong，MAO Haijun. EXPERIMENTAL RESEARCH ON DISTRIBUTION CHARACTERISTICS AND INFLUENTIAL FACTORS OF P-WAVE VELOCITY FOR ROCKS IN NORTHEAST REGION OF SICHUAN PROVINCE. , 2011, 30(S1): 2834-2842.
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2011, Vol. 30 
