塔里木盆地塔中北坡志留系致密碎屑岩地震反演技术及应用
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摘要
塔里木盆地塔中北坡已经发现了致密-低孔低渗岩性油气藏,主要层位为志留系下统柯坪塔格组下砂岩段,本区岩性油气藏具有典型的砂泥岩薄互层特征,而且横向变化大、非均质性极强,含油砂岩的声波阻抗和泥岩的声波阻抗存在较大范围的重叠,难以区分。针对本区岩性圈闭,致密碎屑岩储层的地质、地球物理特点存在的难点,开展地震储层综合预测研究,提出将基于部分叠加数据的叠前同时反演和地质统计学结合起来的致密碎屑岩储层地震反演技术,通过实际应用,验证了该反演技术对储层预测的有效性。
Dense-low porosity and permeability lithologic reservoirs have been found in the northern slope of the central Tarim Basin.Major horizon is lower sandstone member of lower silurian kepingtage formation.Lithologic oil and the gas reservoir has typical characteristics of thin interbeds of sandstone and mudstone,and large lateral variations,strong heterogeneity.Acoustic impedance acoustic impedance and shale oil sandstone of the overlap range so that it is difficult to distinguish.According to the lithologic traps,difficulties in geological,geophysical characteristics of tight clastic reservoir,it develops the seismic reservoir prediction and description technology research.This paper presents tight clastic rock reservoir seismic inversion technique of prestack simultaneous inversion based on partial stack data combined with geostatistics.Through the use of actual data of tight clastic rock in the northern slope of the central Tarim Basin,it verifies the validity of the inversion to reservoir prediction.
Dense-low porosity and permeability lithologic reservoirs have been found in the northern slope of the central Tarim Basin.Major horizon is lower sandstone member of lower silurian kepingtage formation.Lithologic oil and the gas reservoir has typical characteristics of thin interbeds of sandstone and mudstone,and large lateral variations,strong heterogeneity.Acoustic impedance acoustic impedance and shale oil sandstone of the overlap range so that it is difficult to distinguish.According to the lithologic traps,difficulties in geological,geophysical characteristics of tight clastic reservoir,it develops the seismic reservoir prediction and description technology research.This paper presents tight clastic rock reservoir seismic inversion technique of prestack simultaneous inversion based on partial stack data combined with geostatistics.Through the use of actual data of tight clastic rock in the northern slope of the central Tarim Basin,it verifies the validity of the inversion to reservoir prediction.
引文
[1]丁晓琪,张哨楠,周文,等.鄂尔多斯盆地北部上古生界致密砂岩储层特征及其成因探讨[J].石油与天然气地质,2007,28(4):491-496.
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[2]马中高译.地质统计反演——一种用地震资料约束的随机油藏模拟序贯法[J].石油物探译丛,1995(2):17-25.
[3]甘利灯,赵帮六,杜文辉,等.弹性阻抗在岩性与流体预测中的潜力分析[J].石油物探,2005,44(5):504-506.
[4]苑书金,董宁,于常青.叠前联合反演P波阻抗和S波阻抗的研究及应用[J].石油地球物理勘探,2005,40(3):339-342.
[5]赵华,江洁,郑建军.Jason地震反演技术应用中的几个重要环节[J].油气地球物理,2003,1(1):40-42.
[6]张绍红.概率神经网络技术在非均质地层岩性反演中的应用[J].石油学报,2008,29(4):549-552.
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