PCO低渗透砂岩油藏裂缝特征综合描述

COMPREHENSIVE DESCRIPTION OF THE FAULT CHARACTERISTICS FOR PCO LOW-PERMEABILITY SANDSTONE OIL RESERVOIRS

阿根廷PCO油田VOA1油藏为中孔、超低渗的砂泥岩薄互层砂岩储集层,油藏圈闭是单一大型鼻状构造。通过综合分析岩心资料、构造演化、地震曲率属性、蚂蚁追踪属性及油藏圈闭高部位纯油区内部部分井初产高含水的异常响应数据等资料,对构造裂缝的岩心直观特征、构造应变、空间分布范围和几何特征、动态开启机理等进行了综合描述。研究表明,综合地质、地震、生产等资料从多个角度描述裂缝特征及其相关性,可靠性高,可以大大降低单一方法描述裂缝的不确定性,为生产方案调整提供了有效保障。

Oil Reservoir VOA1 of Argentina PCO Oilfield is the sand-shale interbedded sandstone reservoirs with the moderate pores and ultra-low permeability, the trap of the oil reservoirs is a single large-scale fault-nose. With the help of the following comprehensive analyses including the core data, structural evolution, seismic curvature and ant tracking attributes, abnormal response data of the high water cut occurred during the initial production in the partial wells of the net oil blocks of the structural highs of the oil reservoirs, the combined characterization shows from the viewpoints including the visual features of the cores of the structural fracture, structural stress, spa- tial distribution scope and configurations, dynamic opening mechanism and so on. The study achievements show that integrated with the geological, seismic, production data and so forth, the fracture characteristics and their correla- tions are described from the above many viewpoints, the reliability is so high that can reduce the uncertainty of the fracture characterization by individual method to a great deal, thus the effective insurance and guarantee are presen- ted for the adjustment of the production program.