潜江凹陷潜江组沉积充填特征——基于钟112等井钻后

On Characteristics of Deposition Filling in Qianjiang Formation of Qianjiang Depression

近几年钻探的钟112、钟113等井首次在潜江凹陷发现了近岸陡坡扇三角洲沉积,包括砂砾岩扇和灰质角砾岩扇,这一发现丰富了潜江凹陷潜江组沉积类型,总体上受边界断层潜北断层活动、古物源、古气候共同控制,潜江组沉积时期,潜江凹陷自北向南依次为三角洲(扇三角洲)-淡-半咸水湖-盐湖沉积特征,自西向东依次为淡-半咸水湖、荆门三角洲、乐乡关扇三角洲(砂砾岩、灰质角砾岩)、汉水三角洲和淡-半咸湖沉积,具有缓坡带三角洲延伸距离远,陡坡带三角洲(扇三角洲)延伸距离短的特点。

With the completion of wells of Zhong--112, Zhong--113 and other wells in recent years, off--shore steep slope fan delta deposition （including glutenite fan and lime rubble rock） have been found for the first time. This finding brings ample sedimentation types to Oianjiang Formation of Qianjiang Depression. During the deposition pe- riod of Qianjiang Formation, under the common control of Qianbd faulting in boundary fault, Palaeosource and pa- leoclimate, Qianjiang Depression presents the deposition traits of fan delta, light--half salt water lake and salt lake in sequence from north to .south; and from west to east the deposition traits of light--half salt water lake, Jingmen delta, I_exiangguan fan delta （containing glutenite and lime rubble rock）, Hanshui delta and light--half nit lake. Extended distance of Deltas located at gentle slope belt is far while extended distance of deltas--fan deltas--at steep slope zone is short.