Abstract: On the basis of the fine reservoir description,structures and faults distributed in Xiazijie Oilfield are identified,with proving fifteen faults,modifying another seven available and newly finding out ten in total.Evaluation of closure of the faults is made semi-quantitatively and quantitatively by stress analysis of the fault planes and paint factor technique to mudstone. Through further stratigraphic correlation and clarifying macro-depositional setting, subdivision of the sedimentary facies is analyzed together with sedimentary factors of deposits with different lithologic and physical properties.The full-scale description of reservoir heterogeneity characterization indicates not only the strongly non-homogeneous nature, but also the oil sands connectivity up to 65% or so in the case of existing well patterns.Diagenetic periods that the reservoir happened are determined to be the middle and late of its epigenesis phase,which might play an important part in controlling petrophysical properties.The terrestrial stress study shows that the stress state on three orientations appears as complicated inter-relations,with direction of maximum horizontal principal stress of about NE 70°,generally corresponding with the major faulting orientation.A relatively accurate geological model has been developed as a guide for comprehensively governing this kind of reservoir.

Key words: structure, deposition, heterogeneity, ground stress, Xiazijie Oilfield, conglomerate reservoir

摘要： 通过油藏的精细描述,落实了夏子街油田的构造和断裂分布,共证实断裂15条,修改7条,新发现10条;应用断面应力分析和泥岩涂抹系数法半定量—定量地评价了断裂的封闭性.在进一步地层对比和弄清宏观沉积背景的基础上,进行了细分沉积相研究,论述了不同岩性、物性差异的沉积因素.全面描述了储层非均质特征,油藏储层的非均质特征很强,在目前井距下,油砂层连通率仅65%左右.合理地确定了储层所处的成岩阶段—后生期的中、晚期,并认为对储层物性起重要的控制作用.地应力研究表明三向应力大小的相互关系复杂,最大水平主应力方向约北东70°,与主干断裂的方向基本一致.最后建立了比较准确的地质模型,为综合治理该油藏打下了良好的基础.

关键词: 构造, 沉积, 非均质, 地应力, 夏子街油田, 砾岩油藏