北部湾盆地福山凹陷构造—岩性油气藏勘探技术与应用  

Exploration technology of structural-lithologic reservoirs and its application in Fushan Sag of Beibuwan Basin

作　　者：李晓寒 郭浩 卢政环 朱洁琼 冯小东 廖飞燕 LI Xiaohan;GUO Hao;LU Zhenghuan;ZHU Jieqiong;FENG Xiaodong;LIAO Feiyan(Southern Petroleum Exploration&Development Corporation,PetroChina,Haikou,Hainan 570216,China;Dagang Branch,GRI,BGP Inc.,CNPC,Tianjin 300280,China)

机构地区：[1]南方石油勘探开发有限责任公司,海南海口570216 [2]东方地球物理公司研究院大港分院,天津300280

出　　处：《石油地球物理勘探》2022年第S01期130-136,159,12-13,共10页Oil Geophysical Prospecting

摘　　要：近年来,随着勘探程度不断提高,岩性油气藏逐步成为福山凹陷重要勘探目标。凹陷内新生代火山活动频繁,地表、浅、中深层都有大面积火山岩分布,导致地震资料频带窄、成像差、分辨率低;古近系流沙港组为凹陷主要勘探目的层系,储层具有单层薄、横向变化快、砂泥岩互层的特点,预测困难。针对福山凹陷岩性油气藏勘探存在的难点,首先通过地震地层学研究结合地震反射特征、地震构造属性分析开展精细解释,建立高分辨率等时地层格架;然后在地层格架约束下,利用地震属性分析、借助叠后拟声波反演技术开展储层预测;最后利用“低频共振、高频衰减”的叠后油气检测原理预测含油气范围。该系列技术手段在福山凹陷岩性油气藏勘探过程中取得了良好效果。In recent years,with the continuous improvement of exploration degree,lithologic reservoirs have gradually become an important exploration target in Fushan Sag.The Cenozoic volcanic activity in the sag is frequent,and there are large areas of volcanic rocks in the surface,shallow,and medium deep layers,which results in the narrow frequency band,poor imaging quality,and low resolution of seismic data.Paleogene Liushagang Formation is the main exploration target stratum in the sag,and its reservoirs have thin single layers,rapid lateral change,and interbeds of sand and mudstone,which can hardly be predicted.Hence,efforts are made to overcome the difficulties in the lithologic reservoir exploration of Fushan Sag.Firstly,through the study of seismic stratigraphy,together with the analysis of seismic reflection characteristics and seismic structural attributes,fine interpretations are carried out to establish a high-resolution isochronous stratigraphic framework.Then,under the constraints of the stratigraphic framework,reservoir prediction is conducted by the use of seismic attribute analysis and post-stack pseudo-acoustic inversion technology.Finally,the hydrocarbon-bearing range is predicted by the post-stack hydrocarbon detection principle of“low-frequency resonance and high-frequency attenuation.”The technical means mentioned above have achieved good results in the exploration of lithologic reservoirs in Fushan Sag.

关 键 词：北部湾盆地 福山凹陷 构造—岩性油气藏 地震属性 拟声波反演 油气检测 

分 类 号：P631[天文地球—地质矿产勘探]