松辽盆地北部西斜坡姚家组分层特征及其成因分析THE STRATIGRAPHIC DIVISION AND SEDIMENTARY GENESIS OF THE YAOJIA FORMATION IN THE WESTERN SLOPE REGION OF THE NORTHERN SONGLIAO BASIN
王树恒,周华,梁江平
摘要(Abstract):
根据录井、测井、岩芯等资料确定姚家组划分标志与分布情况,姚家组底界面为区域不整合面,姚一段和姚二、三段地层超覆于青二、三段地层之上,垂向上向西依次尖灭;姚一段分布范围较小,局限于研究区东侧,姚二、三段地层分布范围较大。在构造、湖平面变化、湖岸线位置、古地形和沉积体系物源供应的共同影响下,姚一段和姚二、三段沉积环境不同,所发育的沉积体系发生变化,并最终导致岩性和电性发生变化,形成分区,姚一段地层划分为分区特征明显的3个地层小区,姚二、三段地层划分为分区特征明显的4个地层小区。
关键词(KeyWords): 地层划分与对比;姚家组;白垩系;松辽盆地;黑龙江省
基金项目(Foundation): 国家自然科学基金项目“大型坳陷湖盆坡折带的构造-古地貌-剥蚀沉积响应耦合”(No40272057)资助
作者(Author): 王树恒,周华,梁江平
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