【摘要】 沙一下沉积时期,歧口凹陷板桥斜坡、滨海斜坡和歧北低斜坡滨海地区主要沉积类型为重力流沉积,物源主要来自西部沧县隆起。同时在滨海地区CT16×1等井沙一下部分取样薄片中发现鲕粒的存在。通过对歧口凹陷300余口井沙一下亚段薄片等资料的统计分析,认为滨海地区沙一下层段中的鲕粒为异地鲕粒,其来源主要为板桥斜坡及滨海斜坡,以上地区在沙一下沉积时期虽然仍以陆源碎屑沉积为主,但在某些短时段内,存在"暖、清、浅"的区域性欠补偿的高钙清水沉积,发育含鲕粒的碳酸盐岩,形成的原地鲕粒在后期重力流滑塌等事件活动的作用下,沿着滨海、港东断层等输送通道被搬运至滨海地区。通过此次鲕粒来源分析,一方面重新梳理了歧口凹陷两大盆外物源(北部燕山、西部沧县隆起)的波及范围,深化了对歧口凹陷沙一下沉积时期沉积体系的认识;另一方面发展形成了利用地震相、测井相、岩芯相和薄片相"四相合一"的沉积体系研究方法。更多还原

【Abstract】 In the sedimentary period of SQEs1,the main sedimentation type for Banqiao incline,Binhai incline and lower Qibei incline in Qikou sag was gravity flow whose provenance were form western Cangxian Uplift. Meanwhile,ooids were found in the sample sections in well CT16 × 1 in Binhai area. According to statistic analysis of thin sections of SQEs1 from more than 300 wells in Qikou Sag,the authors considered that the ooids were transported to Binhai area along the transporting channels like Binhai and Gangdong fault from Banqiao incline and Binhai incline,these areas developed ooids in some short periods of sedimentary period of SQEs1 because of calcium deposition of high levels in the territorial and under-filling conditions. Based on these analysis,affecting scopes of 2 main provenances outside the basin( northern Yanshan and western Cangxian Uplift) were rebuilt,and the understanding of sedimentary system of Qikou sag in the sedimentary period of SQEs1 was improved; at the same time,the approach to study the sedimentary system was developed to four united phases of seismic data,well logging data,cores and thin sections.更多还原