1 . Bonan
depositional feature of the fan delta from the fourth member of Shahejie Formation , Eogene in Bonansubsag渤南洼陷下第三系沙四段扇三角洲沉積特征
2 . in Bonan
the causes of sidewall instability in Bonanarea are analysed in three sides : geological factors , fluid properties and drilling technique .對渤南地區井壁不穩定的原因,從地質因素、鉆井液特性及鉆井工藝措施等三方面進行分析;