渤海复杂潜山油藏动静态特征识别方法及应用

Dynamic and static feature identification method of complex buried hill reservoirs in Bohai and its application

渤海BZ油田主要为潜山碳酸盐岩油藏,目前已进入开发中后期,由于储层非均质性强,裂缝、孔洞分布规律复杂,导致油井生产特征复杂、产量递减快、动静态储量认识存在较大差异等问题。为此,在常规测井资料、薄片和少量岩心分析资料的基础上,结合不稳定试井和生产特征等资料,建立了油田碳酸盐岩储层类型动静态特征综合识别标准,渤海BZ油田碳酸盐岩储层主要划分为裂缝型、裂缝-孔隙型、孔隙型3种类型储层;基于静态优质储层预测,综合考虑了储层的平面、纵向的非均质性,建立了三维数值试井模型,精细刻画识别了复杂井储层边界和连通状况,合理评价了动态储量,证实了太古界潜山含油气潜力,为油田开发中后期制定调整对策提供依据,指导油田调整挖潜,并获得高产验证。

The BZ oilfield in Bohai,known for its buried hill carbonate reservoir,is currently in the middle to late stages of development.The reservoir is characterized by strong heterogeneity and a complex distribution of fractures and vugs,leading to challenges such as complicated production behavior,rapidly declining output,and significant discrepancies in the estimation of dynamic and static reserves.To address these issues,a comprehensive set of criteria for identifying different types of carbonate reservoirs in the oilfield was developed.This was based on conventional well log data,thin section analyses,limited core data,and information from well tests and production characteristics.The reservoirs were categorized into three main types:fracture,fracturevuggy,and porous.A detailed three-dimensional numerical well-testing model was created to accurately predict high-quality reservoir zones.This model took into account the reservoir's horizontal and vertical heterogeneity,allowing for precise delineation and assessment of the reservoir boundaries and connectivity in complex wells.It also facilitated a more accurate evaluation of the dynamic reserves and confirmed the oil and gas potential in the submerged mountains at the boundary of the Archaean group.This comprehensive approach laid the groundwork for devising strategic adjustments during the latter stages of the oilfield's development.It guided field modifications aimed at maximizing the reservoir's potential,ultimately leading to validated high production outcomes.