歧口凹陷埕北断阶带油气输导体系及其控藏作用
张洪 , 赵贤正 , 王居峰 , 金凤鸣 , 刘海涛 , 蒲秀刚 , 董晓伟 , 赵长毅 , 吴丰成 , 董雄英
地球科学 ›› 2023, Vol. 48 ›› Issue (08) : 3053 -3067.
歧口凹陷埕北断阶带油气输导体系及其控藏作用
Hydrocarbon Migration Pathways and Its Control on Accumulation in Chengbei Fault Zone of Qikou Sag, Bohai Bay Basin, East China
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受构造与沉积作用影响,埕北断阶带形成断层-砂体-不整合复杂输导网络体系,影响油气运移和聚集. 基于地震、录井、测井资料,刻画研究区输导格架样式及展布特征,依据油气分布及原油物化性质明确优势输导体系及控藏作用. 结果表明,在沙一段顶部-东营组、明化镇组两套区域性泥岩盖层分割下,垂向上形成沙三段-沙二段-沙一下亚段、馆陶组-明化镇组输导层,与断层匹配组成上、下二元输导格架,chh24、h4井区是油气突破东营组盖层向上部输导层跨越的泄露点. 平面上存在4大输导格架带:歧南次凹-友谊-刘官庄沙三段、沙一段、馆陶组;中低断阶中部沙二段、沙一段、馆陶组;歧南-中断阶沙三段、沙二段、沙一段;张东东井区沙三段、沙二段、馆陶组输导格架带. 油气富集特征及物化性质证实,输导格架带内局部构造高点控制油气优势运移指向,示踪的4条优势输导体系形成油气规模充注通道,二元输导格架控制油气“阶状”富集模式. 中低断阶中部沙二段与沙三段、高斜坡馆陶组与明化镇组阶梯式油气勘探存在较大潜力,相关认识有助于相似区域油气深入挖潜.
歧口凹陷 / 埕北断阶带 / 输导格架 / 优势输导体系 / 控藏作用 / 石油地质
Qikou Sag / Chengbei Fault Zone / carrier framework / preferntial migration pathway / accumulation control / petroleum geology
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中国石油集团公司“十四五”前瞻性基础性项目(2021DJ1802)
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