
第39卷第1期 2018年2月
文章编号:10013873(2018)01-0104-05
新疆石油地质
XINJIANGPETROLEUM CEOLOGY DOI:10.7657/XJPG20180114
Vol. 39,No.1 Feb.2018
基于OVT域资料的低渗透砂砾岩储集层预测
王斌"2,尹路",陈永波",滕团余",李得滋
(1.中国石油勘探开发研究院西北分院,兰州730020;2.成都理工大学地球物理学院,成都610059)
要:准噶尔盆地玛潮凹陷东斜坡百口泉组砂砾岩储集层“甜点”,具有侧向叠置严重、厚度较小、非灼质性较强的摘
特点,基于常规资料准确预测该类储集层的难度较大。而以方位各向异性分析为核心的OVT域叠前地震属性分析技术,能够充分利用叠前地震资料蕴含的地质信息和流体信息,可以更有效地进行储集层预测。忽是由于原始OVT城道集受不稳定的能量、不均衡的密度以及较低信噪比的影响,其道集质量不稳定。因此,介绍了一种从道集评价及预处理开始,利用动态分析寻找优势的道集方位,并进行部分道集叠加提高地震资料的像质量及分排率的方法。利
区并位部署和储量落实提供了依据。
关键词:玛溯西陷;百口泉组;砂砾岩储集层;"错点";OVT域;叠前反演;弹性参数;宽方位
中图分类号:TE122.2;P631.4
文献标识码:A
OvT Domain-BasedPredictionTechnology for Low-Permeability Sandy-Conglomerate
Reservoirs
WANG Bin'2,YIN Lu', CHEN Yongbo', TENG Tuanyu', LI Dezi'
(1.Northwest Branch, Research Institute of Petroleum Exploration and Development, PetroChina, Lanzhou, Gansu 730020, China;
2.School of Geophysics, Chengdu University of Technology, Chengdu, Sichuan 610059, China)
Abstract: The sweet spot of the sandy conglomerate reservoir in Baikouquan formation on the eastem slope of Mahu sag, Junggar basin is characterized by serious lateral superimposition, small thickness and strong heterogeneity, It is difficult to accurately predict this kind of reservoir with conventional data, OVT-domain prestack seismic attribute analysis technology which takes azimuthal anisotropy analysis as gaaia oaed aoa e aaesa eeoa oe aasn eoa a due to the influences of unstable energy, unbalanced density and relatively low signal-noise ratio on original OVT-domain gathers, the gath er quality is not very good. Therefore, the paper introduces a new method which can use dynamic analysis to find the advantageous azimuth of gathers, do stacking of partial gathers and finally improve imaging quality and resolution of seismic data. The processed seismic data is used to predict the sweet-spot reseroir distribution in the eastem Mahu area. The predicted area of the sweet-spot reservoir is about 140 km', which provides basis for well deployment and reserves estimation in the eastem Mahu area.
Keywords: Mahu Sag; Baikouquan formation; sandy conglomerate reservoir, sweet spot; OVT domain; prestack inversion; elastic parameter;
wide azimuth
随着准噶尔盆地玛湖凹陷斜坡区在玛北和玛西地区下三叠统百口泉组(T,b)油气勘探的突破,针对环玛湖凹陷斜坡区百口泉组砂砾岩储集层的研究成为热点"-}。已钻井的资料证实,研究区内目的层埋深大,特别是玛东地区,埋深在4000~5000m;有利的沉积相带为扇三角洲前缘亚相,砂层纵向叠置严重,“甜点"储集层厚度较小,一般为10~15m"。仅利用常规地震资料进行叠前弹性参数反演,难以区分储集层和非储集层。为有效识别该区地震相带边界和优质砂砾岩储集层,自2013年开始,在研究区实施了高密度宽方位地震资料采集。利用面向宽方位地震勘
收稿日期:2017-12-04
修订日期:2017-12-05
基金项目:国家青年基金项日(41402127)
探的高端处理技术,能获取炮检距和方位角信息的叠前地震道集,而这种资料需要采用特殊的处理技术,即OVT域处理技术。
OVT(Ofsetvectortile)通常翻译成“炮检距向量片技术",最早由Vermeer在研究采集其研究区的最小数据集表达时提出-。由于原始OVT域道集的质量受不稳定能量、不均衡密度和较低的信噪比影响,其质量并不稳定,因此,为了充分发挥高密度宽方位地震勘探技术在储集层预测中的效能,满足玛湖凹陷百口泉组油气勘探的需求,通过对OVT域资料评价、预处理、动态分析和优势道集叠加等一系列处理后,
作者简介:工斌(1985-),男,甘肃会宁人,T.程师.博士研究生,地球物理期探,(Tel)0931-8686061(E-mail)wangbin_xdls@
petrochina.com.cn
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