北黄海盆地东部坳陷侏罗纪西南物源-沉积体系与源区构造背景
Southwestern ProvenanceSedimentary System and Provenance Tectonic Setting of Eastern Sag in the North Yellow Sea Basin

物源-沉积体系是原始储层物性的主要影响因素，与源区构造背景的综合分析是油气勘探工作的基础.北黄海盆地是位于苏鲁造山带-临津江造山带北侧中朝板块上中-新生代转换伸展断陷盆地.地震和钻井资料证实东部坳陷西南部有中-上侏罗统三角洲砂体发育.岩心和测井上可识别的沉积类型包括分流河道、决口扇、河口坝和远砂坝等，地震反射结构显示出来自西南方向的沉积物进积.砂岩样品的岩矿组成显示，碎屑中存在花岗质成分和酸性火山岩成分.泥岩元素地球化学特征显示其物质成分以长英质为主，推测源区为克拉通或再旋回造山带.砂岩Dickinson图解表明，不仅存在来自克拉通或再旋回造山带的成分，而且存在火山弧造山带的成分.综合分析认为，北黄海盆地东部坳陷西南物源区为再旋回造山带，花岗质成分来自西南盆缘的基底花岗质岩石的风化，而火山岩成分可能是同期火山喷发的产物，也可能是先前火山岩的风化产物.
The comprehensive analysis of provenancesedimentary system and provenance tectonic setting is the basis of oil and gas exploration, the provenancesedimentary system is the main influence factor of the original reservoir. The North Yellow Sea basin is a MesozoicCenozoic transtensional faulted basin located between SuluLinjinjiang orogeny and JiaoLiao uplift. The delta sand deposits developed during the MiddleLate Jurassic have been confirmed by seismic and drilling data in the southwest of eastern sag, the North Yellow Sea basin. Some sedimentary types, including distributary channel, crevasse splay, mouth bar and distal bar, can be recognized in the core rocks and well loggings, and the progradation of sediments in northwestern orientation is shown in the seismic reflection. The analysis of petrology and mineralogy of the sandstone samples indicate that they contain granitic and acid volcanic compositions. The element geochemistry characteristics of the mudstone samples show that their major composition is felsic, and the provenance is the craton or the recycling orogeny. The Dickinson diagram of the sands demonstrates their compositions coming from both the craton or the recycling orogeny and volcanic arc orogeny. We suggest that the southwestern provenance in the eastern sag of the North Yellow Sea basin is the recycling orogeny. The granitic composition comes from the weathered basement granitic rocks, and the volcaniclastics may come from the syneruption, or from weathered preexisting volcanic rocks