伊拉克HF油田Mishrif组层序地层特征

Sequence stratigraphy of Mishrif formation in HF oilfield of Iraq

利用层序地层学的理论和方法对HF油田Mishrif组油藏的层序地层进行精细划分与对比研究。结果表明:①伊拉克HF油田Mishrif组可划分出两个三级层序S8和S7,五个四级层序IV1、IV2、IV3、IV4、IV5。②S8以海侵体系域为主,发育两个四级层序,以滩与灰坪交互相为主;S7以高位体系域为主,发育三个四级层序,纵向上多期滩相叠置;五个四级层序分别与MC3、MC2、MC1–MB2、MB1、MA段相对应。③五个四级层序横向可对比,与开发大层基本一致,其中IV3和IV4的厚度变化较明显。

Based on the study of key geological problems of Mishrif formation reservoir in HF oilfield,the study related with fine division and correlation is carried out by using sequence stratigraphy.The results show that:①Mishrif formation in HF oilfield of Iraq can be divided into two third-order sequences,namely S8 and S7,and five fourth-order sequences,namely IV1,IV2,IV3,IV4 and IV5.②S8 is dominated by transgressive system tracts,with two fourth-order sequences,which are dominated by the interaction of shoal and Huiping;S7 is dominated by highstand system tract(HST),with three fourth-order sequences and multi-stage beach facies superimposed vertically;the five fourth-order sequences correspond to MC3,MC2,MC1-MB2,MB1 and MA.③The five fourth-order sequences can be correlated laterally,which are basically consistent with the development layer,and the thickness changes of IV3 and IV4 are obvious.