%0 Journal Article
%T Analysis of the velocity anisotropy and its affection factors in shale and mudstone<br>泥岩、页岩声速各向异性及其影响因素分析
%A DENG Ji-Xin
%A SHI Ge LIU Rui-Xun YU Jun School of Earth
%A Space Sciences
%A Peking University
%A Beijing
%A China Geophysical Prospecting Key Laboratory
%A <br>邓继新
%A 史 硍
%A 刘瑞?
%A 俞 军
%J 地球物理学报
%D 2004
%I 
%X The velocity anisotropy is examined in laminated shale and mudstone under the laboratory ultrasonic frequency. The variation patterns of wave velocity in different directions as a function of confining pressure are also presented for dry and oil-saturated situations. Using the X-ray diffraction technique and electron microprobe imaging, we make analysis and conclude that the clay minerals and microcracks are the intrinsic factors that result in such strong anisotropy in rock samples. With the increasing confining pressure, microcracks are gradually closed, which low the anisotropy. Pore fluid increases the pore rigidity thus decreases the tendency of anisotropy change with confining pressure.
%K Mudstone
%K Shale
%K Ultrasonic velocity
%K Anisotropy<br>泥岩
%K 页岩
%K 声速
%K 各向异性
%K 超声波频率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=1E44AE713D8A6DE0&jid=14DC41C59CBF6770055A7D610D53AE46&aid=7B392B11D409FB98&yid=D0E58B75BFD8E51C&vid=F4B561950EE1D31A&iid=94C357A881DFC066&sid=D5B44BB3CCE27369&eid=B84F2E0A99FDC89A&journal_id=0001-5733&journal_name=地球物理学报&referenced_num=8&reference_num=14