南海西部深水区潜山储层分带特征与有利储层预测

Zoning characteristics of buried hill reservoir and prediction of favorable reservoir in the western deep water area of South China Sea

花岗岩潜山是南海西部琼东南盆地深水区重要的油气勘探领域。研究表明储层是潜山油气成藏的关键,但受制于现有地震资料品质,潜山有利储层预测难度大。本文结合已钻井岩电参数分析,通过精细井震对比,开展潜山有利地震相识别与纵向相带划分,将潜山储层划分为风化带与裂缝带;综合正演模型技术,分析潜山有利储集相带的地球物理特征,确定优势地震相,建立了风化带与裂缝带的岩电-地震识别标志。针对基底资料低信噪比现状,应用蚂蚁体、曲率体等属性融合技术,结合区域构造演化与断裂展布研究,精细刻画裂缝产状,减少预测多解性,有效提高了潜山裂缝型储层预测精度,在研究区取得较好的应用效果,有力促进了下步的勘探研究工作。

The granite buried hill in the deep water area of Qiongdongnan basin in the west of South China Sea is an important oil and gas exploration area.Researches show that reservoir plays a key role in buried hill petroleum accumulation.However,due to the low quality of existing seismic data,it is difficult to predict favorable buried hill reservoirs.In this paper,combined with the analysis of the electrical parameters of drilled rocks,through fine well seismic comparison,favorable seismic facies of buried hill were identified and the facies belts were divided longitudinally.The buried hill reservoir was divided into weathering zone and fracture zone.Based on the forward modeling technology,the geophysical characteristics of the favorable reservoir facies zone of buried hill were analyzed to determine the dominant seismic facies,and the rock electricity-seismic identification marks of weathering and fracture zones were proposed.Considering the present situation of low signal-to-noise ratio of basement data,the technology of ant body merged with curvature body was applied to accurately depict the occurrence of fractures based on the research of regional tectonic evolution and fracture distribution,which has reduced the possibility of obtaining multiple solutions in prediction and effectively improved the prediction accuracy of fractured reservoir in buried hill.It has achieved good application effects in the study area,and significantly facilitated the exploration and research work in future.