摘要
柴达木英西地区下干柴沟组上段湖相碳酸盐岩储层具有岩性复杂、物性差、非均质性强的特点,是制约其勘探进程的主要原因之一。为此,依据古地貌控相、相控储层、储层控藏的地质认识,提出了以沉积旋回为单元、古地形为框架、地震—测井岩相分析为桥梁的相控分频反演方法,该方法构建的低频模型以相带为单元进行插值,有别于以距离大小进行插值的传统方法,更符合地质实际。其技术思路为:首先,通过分析明确研究区层序格架、古地貌、岩相展布规律;其次,采用分频成像、相位转换、地层切片等技术手段构建低频模型;最后采用分频非线性反演方法,利用低频模型进行约束,实现对复杂地质体的准确预测和描述。研究结果表明,英西地区目的层段优质储层发育区随着古低隆的向北迁移而不断变化,其叠合有利储层面积约为150km^2,预测结果与钻井及地质规律吻合度高,为该区的进一步勘探评价提供了有效依据。
Lacustrine carbonate reservoirs in the upper member of Xiaganchaigou formation,Yingxi,Qaidam Basin are characterized by complex lithology,poor physical property,and strong heterogeneity.As the formation,the distribution and oil-gas accumulation of lacustrine carbonate reservoirs are controlled by sag palaeo-highs in the study area,we propose a facies-constrained and segmented-frequency-band inversion to predict lacustrine carbonate reservoirs based on sedimentary cycles,palaeoterrain,and seismic logging facies constraints.The interpolation in low frequency models constructed by the inversion is achieved with a facies zone,which is different from conventional interpolations based on the distance.First we conduct the analysis of the geological stratigraphy,palaeo-geomorphology,and lithofacies.Then we build a low frequency model with segmented-frequency-band imaging,phase transform,and so on.Finally we achieve segmented-frequency-band nonlinear inversion constrained by the low frequency model to predict complex targets.Based on our application in Yingxi,a favorable reservoir zone of 150 km^2 is predicted and this prediction matches very well drilling and geological data,which proves effectiveness of the proposed approach.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2018年第4期832-841,共10页
Oil Geophysical Prospecting
基金
国家科技重大专项(2017ZX05001-002)
中国石油天然气股份有限公司重大科技专项(2016E-01
2016B-0303)联合资助
关键词
湖相碳酸盐岩
相控
分频反演
储层预测
英西地区
lacustrine carbonate rocks
facies-constrained
segmented-frequency-band inversion
reservoir prediction
Yingxi area
