摘要
饶阳凹陷是渤海湾盆地富油凹陷之一,主要发育沙三段上亚段和沙一段下亚段2套主力烃源岩,分布于马西、任西、河间—肃宁及饶南4个洼陷。选取研究区44口探井,利用Basinmod盆地模拟软件,结合地层展布、地温梯度及东营组剥蚀厚度等资料,研究了沙三段上亚段和沙一段下亚段烃源岩在不同历史时期的成熟度平面演化特征。结果表明,饶阳凹陷不同洼陷、不同构造带各套烃源岩的热演化特征存在明显差异。河间—肃宁洼陷热演化程度最高,其沙三段上亚段烃源岩在东营组沉积末期进入生烃门限,馆陶组沉积末期进入生烃高峰,现已进入伴生气阶段; 沙一段下亚段烃源岩在馆陶组沉积初期进入生烃门限,明化镇组沉积中期至今均处于成熟油阶段。而杨武寨—武强地区由于东营组遭受严重剥蚀,沙三段上亚段烃源岩自明化镇组沉积中期至今均处于低熟油阶段,沙一段下亚段烃源岩至今未进入生烃门限。凹陷内的油藏围绕生油洼陷中心呈环带状分布,不同构造单元或区带、不同勘探层系油气富集程度与距油源远近具有密切关系,越靠近生油洼陷,油气富集程度越高。
The Raoyang sag is one of the hydrocarbon-rich sags in Bohai Bay Basin, mainly developed two major source rocks-Es3 and Es,x, located in Maxi, Renxi, Hejian-Suning and Raonan sub-sags. Selected 44 exploration wells, combined with the temperature data, the thickness of Ed denudation data in the study area, the evolution of the maturity of planar of Es,x and Es3s source rocks in different historical periods are studied from point to plane. The results show that evolutionary history of maturity of source rocks is significantly different in different sub-sags and different structures in Raoyang sag: the degree of thermal evolution in Hejian-Suning sub-sag is the highest, Esis source rock entered hydrocarbon generation threshold in the end of Ed, reached the peak of hydrocarbon generation in the end of Ng and now comes into the associated gas phase; Es,x source rock entered hydrocarbon generation threshold in the early of Ng and has been always in the stage of mature oil from the interim of Nm to now. Due to serious erosion of Ed, Es,x source rock did not enter hydrocarbon generation threshold until now, Es3s source rock is still in immature stage from the interim of Nm to now in Yangwuzhai-Wuqiang region. Around the hydrocarbon generation center, reservoirs show a zonal distribution in the sag. Enrichment of the reservoirs has a close relationship with the distance between oil source in different structures and exploration strata.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2012年第4期1-4,111,共4页
Petroleum Geology and Recovery Efficiency
关键词
盆地模拟
烃源岩
成熟度
生烃史
油藏分布
饶阳凹陷
basin modeling
source rocks
maturity
hydrocarbon generation history
reservoir distribution
Raoyang sag
