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《Acta Sedimentologica Sinica》 2009-02
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Relationship between Sedimentary System and Acoustic Velocity of Rocks from Marine Strata in Keping-Bachu Area

ZENG Fan-ping1 ZHU Pei-min1 JIAO Yang-quan2 WANG Rui2 XING Feng-cun3(1.Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074; 2.Institute of Earth Resources,China University of Geosciences,Wuhan 430074; 3. Institute of Earth Resources,China University of Geosciences,Beijing 100083)  
In order to make a scrutiny into physical properties of formation in various depositional environments,we carried out a geological exploration and collected a lot of samples from platform edge clinoform system and chipping sedimentary system in outcrop area located in Keping-Bachu,Tarim Basin,and Northwestern China. After analysis of the ultrasonic measurements of the samples at normal temperature and standard atmosphere in the laboratory,the conclusions are given as follows:(1) There is a close relation between ultrasonic velocities of samples and depositional environment. In the bioherm profile,the velocity increases from reef base,reef core to reef cap; in the delta profile,the velocity increases from distributary channel to delta front. (2) In the bioherm profile,the biodetritus is the key influencing factor to velocity; the richer organism of the sample is,the higher the velocity is. In the sandstone profile,the larger the filling extent of the sandstone pore is,the higher the velocity is. (3) The growth direction of organisms is a principal factor,which controls the extent of the velocity anisotropy. The velocities are different between along and against growth direction of organisms. These results can be used to guide geophysical forward modeling,geophysical inversion,seismic interpretation and reservoir prediction.
【Fund】: 中国石油化工集团公司前瞻性项目专题(编号:2007026230);; 国家自然科学基金项目(批准号:40174033)资助
【CateGory Index】: P631.5
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