中国南海流花油田生物礁储层裂缝预测建模研究

流花油田是南海东部海域深水生物礁灰岩稠油油田,具有沉积环境复杂多变、构造不确定性大、灰岩储层物性评价困难、横向非均质性强、储层裂缝发育、双孔介质特征明显等诸多特点。为了研究该油田储层裂缝分布特征,在礁灰岩沉积演化及相带划分的基础上,利用岩心、地震、钻井和成像测井资料,建立了礁灰岩三维裂缝网络模型,研究结果表明,流花油田储层中礁相主要发育低角度压溶缝和溶蚀缝,裂缝开度较大,而滩相多发育高角度成组缝,以构造缝和构造溶缝为主,优势走向为北西-南东向。影响中国南海珠江口盆地流花油田礁灰岩裂缝发育的既有构造因素,又有成岩后生作用。研究结果与开发动态情况对比表明,该研究方法可有效指导油田的开发。

Fracture prediction modeling of reef limestone reservoirs in south China Sea

Liuhua oilfield was a deep-water reef limestone heavy oilfield in south China Sea and had characteristics of complicated sediment environment,big structure uncertainty,big difficulty in reservoir property evaluation,strong anisotropy,developed fractures and dual porosity media.In order to make a study on distribution characteristics of reservoir fractures,based on depositional evolution of reef limestone and facies classification,by fully using coring,seismic,drilling and imaging logging,the fracture network model of the reef limestone reservoirs was established.The results indicated pressolution and dissolution seams with low angle and bigger crack opening were mainly developed in reef facies,while group seams with high angle were developed in beach facies,which was focused on the tectonic joints and tectonic soluble seams,with superiority striking in north west-south east.The influencing factors of the reef limestone fracture development in Liuhua oilfield included both the structural factors and the later diagenesis.The comparison between the research results and the dynamic status showed the method could provide good guidance for oilfield development.