塔西南地区早古生界台缘斜坡带特征及分布

Distribution characteristics of Eopaleozoic platform edge slope in southwestern Tarim Basin

综合地震、测井、岩心、露头等资料,提出寒武纪—早奥陶世时期塔里木西南部发育台地边缘斜坡带。该斜坡带沿坎地里克—叶城—胜和2井—玛参1井连线一带呈近东西向展布,整体表现为退积型台缘缓斜坡。在寒武纪—早奥陶世的不同时期,该斜坡带性质和分布位置略有变化,寒武纪为宽缓斜坡,早奥陶世为弱镶边缓斜坡,斜坡带具有向北部台地逐期缓慢迁移的特点。塔西南台缘坡折带的存在表明玛南—和田河地区台缘高能相带和塔西南深水陆棚相带存在的可能性,对该区的烃源岩和储层评价预测具有重要意义。

Based on the comprehensive research of seismic,logging,core,and outcrop data,the platform edge slope developed in Cambrian？early Ordovician in southwestern Tarim Basin was proposed.The slope is generally retrogradated wide gentle slope,and distributes along the connection line of kandilike？yecheng？shenghe2？macan1.The character and location of these slopes are obviously diversified and they migrate from southern basin to northern platform in different phases of Cambrian？early Ordovician,and exist as a wide gentle slope in Cambrian,and develop into rimmed slope.The occurrence of the platform edge slope indicates that the existence of platform edge of high-energy facies in Manan？Hetianhe area and deep-shelf in southwestern Tarim Basin,which plays an important role in reservoir evaluation and source predication in southwestern Tarim Basin.