永安镇油田永3断块沙二下河口坝储层结构单元划分及其意义

根据结构单元分析法,以永安镇油田永3断块沙二下亚段6砂层组61小层为例,对河口坝增生体不同级别的沉积界面进行划分;在此基础上对河口坝增生体沉积演化特点、增生体的顶面构造特征以及增生体油(气)水分布规律进行研究。结果表明:永3断块沙二下6砂层组61小层划分为6期增生体;永3断块61小层可分6期演化,6期增生体具有由西向东退积的特点;不同河口坝增生体的发育位置、范围及其顶面构造特征对增生体油(气)水分布具有重要的控制作用;大型三角洲河口坝增生体可作为独立的油气分布单元,其油气储量可以相当可观,以增生体为单元进行油(气)水分布规律研究非常必要。

Architectural elements division of debouch bar of Lower Es2submember in Yong 3fault-block reservoir in Yong 'an Zhen Oilfield and its significance

Based on architectural element analysis, the delta-front debouch bar in the first layer of Es₂^6of Yong 3fault-block reservoir in Yong ''an Zhen Oilfield was divided into depositional interfaces of various levels. The characteristics of the sedimentary evolution,the depositional architecture and the oil (gas) and water distribution were studied. The result indicates that the accretion sandbody of debouch bar can be divided into six stages. The evolution of the first layer of Es₂^6of Yong 3fault-block reservoir in Yong ''an Zhen Oilfield is summarized as six periods, which is characterized by west to east retrogradation. The location, the area and the top-surface structure of the accretion sandbody control the oil (gas) and water distribution. The accretion sandbody of large-scale delta debouch bar,which has substantial reserves of oil and gas, can be used as independent oil and gas distribution unit, and it is highly necessary to study the distribution of oil(gas)by taking the accretion sandbody as an unit.