摘要
In order to study the sequence features and depositional evolution of Middle Devonian Luofu Formation in Guizhong Depression by the theories of outcrops, drill core, sequence stratigraphy and sedimentology, Middle Devonian outcrops and well drilling data are analyzed carefully. Two third-order sequences are identified and named as SQ1 and SQ2. The methods of identificating sequence boundary are analyzed. Sequence boundary in seismic profile is found to be onlap and truncation in the transition zone of stacking pattern. By analysis of cadre cut plane, assisting cut plane and chief well drilling datas, sedimentary facies in study area are well known. Dipositional system maps in Middle Devonian Donggangling stage (SQ1 and SQ2)are established.