莱州湾凹陷垦利A油田沙三段物源转换与沉积充填响应  

Provenance transformation and sedimentary filing response of third member of Shahejie formation in Kenli A Oilfield,Laizhouwan Sag

作　　者：岳红林 张岚 崔龙涛 李卓 YUE Honglin;ZHANG Lan;CUI Longtao;LI Zhuo(Tianjin Company,CNOOC(China)Co.,Ltd.,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《石油地质与工程》2023年第2期29-34,共6页Petroleum Geology and Engineering

基　　金：国家科技重大专项“渤海油田高效开发示范工程”(2016ZX05058)。

摘　　要：通过对莱州湾凹陷垦利A油田沙三段重矿物、地震前积反射特征、地层厚度综合分析,认为从沙三中亚段到沙三上亚段,垦利A油田的物源供给方式、沉积充填特征发生了明显变化。沙三中亚段沉积时期,研究区物源来自西南部垦东凸起,凹陷内部发育大型辫状河三角洲,三角洲自垦东凸起逐步进积至莱北低凸起;沙三中亚段沉积晚期,辫状河三角洲覆盖莱北低凸起;沙三上亚段沉积之前,莱北低凸起被抬升至湖平面以上,研究区物源也由沙三中亚段的垦东凸起单物源转换为垦东凸起和莱北低凸起的双物源,凹陷内部发育两支辫状河三角洲,一支为西南部垦东凸起辫状河三角洲,一支为莱北低凸起辫状河三角洲,二者在研究区南部交汇。沙三中亚段到沙三上亚段的物源转换,导致沙三中亚段与沙三上亚段在沉积模式与储层发育样式存在一定变化,为后续油田储层预测研究提供了基础。Based on the comprehensive analysis of heavy minerals,seismic progradation reflection characteristics and stratum thickness,it is believed that the material supply mode and sedimentary filling characteristics of Kenli A oilfield have changed evidently from the E_(2)s_(3)^(m) to E_(2)s_(3)^(u).In the sedimentary of E_(2)s_(3)^(m),the provenance of the study area comes from the Kendong uplift in the southwest,large braided river delta developed in the sag,the delta progressed from Kendong uplift to Laibei low uplift,up to the late E_(2)s_(3)^(m) sedimentary stage,the braided river delta covered the Laibei low uplift.Before the sedimentary of E_(2)s_(3)^(m),the Laibei low uplift was raised above the lake level to provide detrital sediments as a provenance area,at this time,the regional provenance of oilfield changed from single provenance of Kendong uplift in the E_(2)s_(3)^(m) sedimentary stage to double provenance pattern of Kendong uplift and Laibei low uplift.There are two braided river deltas developed in the sag,one is from Kendong uplift in the southwest,the other is from Laibei low uplift in the north,and the two braided river deltas mixed in the south region of the study area.The provenance transformation from E_(2)s_(3)^(m) to E_(2)s_(3)^(u) leads to the changes of sedimentary pattern and reservoir development styles,which provides a basis for the follow-up reservoir prediction.

关 键 词：莱州湾凹陷 沙三中亚段 沙三上亚段 物源转换 沉积充填 

分 类 号：TE121.3[石油与天然气工程—油气勘探]