“水包油”油藏成因机制探讨及石油地质意义

Abstract

辽河油田曙一区馆陶油藏为块状边顶底水超稠油油藏，四周被水包围，没有泥岩(或物性)盖层，油藏被一层“沥青壳”封盖。本文从成藏机理入手，通过大量的岩心资料、测井资料以及物模研究，认为物性盖层封堵和自凝结成藏这两种成藏理论对该油藏不适用，对比分析了沥青壳油藏外部稠化带与正常油层的孔隙度、渗透率、含油饱和度、导热率、电阻率及地化特征、空间分布等特征，并深入探讨沥青壳油藏的成因机制，描述了油水界面的特征，依据实际生产数据，研究了影响SAGD开发效果的主控因素，建立了顶水下泄的临界技术条件，制定了预防顶水下泄措施。 Guantao oil reservoir of Shu1 area in Liaohe oilfield is a massive super heavy oil reservoir with edge and top and bottom water, which is surrounded by water, without mudstone (or physical) cap rock and covered by “Asphalt shell”. Starting from the mechanism of reservoir formation and studying a large number of core data, logging data and physical modeling, it is considered that the two reservoir formation theories of physical cap rock sealing and self-condensation are not applicable to this reservoir. By comparing and analyzing the porosity, permeability, oil saturation, thermal conductivity, resistivity, geochemical characteristics, spatial distribution and other features of the external thickening zone and normal oil layer of the asphalt shell oil reservoir, the paper deeply discusses the genetic mechanism of asphalt shell reservoir, describes the characteristics of the oil-water interface, studies the main factors influencing SAGD development effect based on actual production data, establishes the critical technical conditions of the top water discharge and develops measures to prevent the discharge of water.