关键词: 构造, 沉积, 非均质, 地应力, 夏子街油田, 砾岩油藏

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