渤海变质岩潜山储层特征及分布预测研究
Research on the Characteristics and Distribution Prediction of Bohai Metamorphic Rock Buried Hill Reservoirs

近几年随着渤海一系列大型潜山油藏勘探发现，潜山油藏已成为渤海勘探、开发的重点目标。潜山油藏裂缝成因复杂、非均质性强，且地震资料品质差，致使裂缝储层精细、准确预测难度大。为了研究渤海变质岩潜山风化壳的发育特征及其储层预测方法，本文从潜山裂缝储层的成因机理出发，对风化壳的垂向结构进行了系统的划分，将潜山风化壳依次划分为强风化带、次风化带及内幕带。通过对已钻井资料和地震资料综合分析，开展了裂缝地球物理响应特征分析研究，分析了裂缝密度与储层之间的关系，确定了强风化带内储层厚度与裂缝发育程度的正相关性，通过属性优选，精细描述了风化带裂缝储层发育特征。该套技术体系有效指导了渤中19-6气田方大气田的储量评价，为渤海类似地质条件的深埋潜山勘探开发提供了宝贵经验。
In recent years, with the discovery of a series of large-scale buried hill reservoirs in Bohai, buried hill reservoirs have become a key target for exploration and development in Bohai. The genesis of fractures in Qianshan oil reservoirs is complex, with strong heterogeneity, and poor seismic data quality, making it difficult to accurately predict fractured reservoirs. In order to study the development characteristics and reservoir prediction methods of weathered crust in Bohai metamorphic rock buried hills, this paper starts from the genesis mechanism of fractured reservoirs in buried hills and systematically divides the vertical structure of weathered crust into strong weathering zone, secondary weathering zone, and inner curtain zone. Through comprehensive analysis of drilling and seismic data, a study was conducted on the geophysical response characteristics of fractures. The relationship between fracture density and reservoir was analyzed, and the positive correlation between reservoir thickness and fracture development degree in strongly weathered zones was determined. Through attribute selection, the development characteristics of fractured reservoirs in weathered zones were described in detail. This technical system effectively guides the reserve evaluation of the BZ19-6 gas field in the Bohai Sea, providing valuable experience for the exploration and development of deep buried hills with similar geological conditions in the Bohai Sea.