摘要
在塔河油田碳酸盐岩油藏中岩溶古河道作为一种重要的储集类型,易受沉积物充填,储层非均质性强,不同的充填程度和充填物类型导致古河道储集体产量存在差异,而古河道内部充填特征量化表征一直是勘探开发中难以解决的技术难题.本文以塔河工区某一典型河道为研究对象,从叠前反演的角度出发,介绍了一种岩溶古河道充填特征的定量描述方法,首先采用典型河道的测井曲线交汇分析,明确了弹性参数、孔隙度和充填物含量三者之间存在关联,基于此,采用叠前弹性反演技术获得弹性参数,将其作为输入数据,采用储层物性反演技术获得充填物含量,最终结合弹性参数和充填物含量对典型河道进行了充填特征的综合描述,形成了古河道充填特征的量化描述方法,通过实际应用及钻井标定,充填程度吻合率达85.2%,充填物含量与测井解释结果高度吻合,验证了该方法的可行性与可靠性,对岩溶古河道油藏的高效开发具有重要的指导意义.
As one of important reservoir types of carbonate reservoir in Tahe oilfield, karst paleochannels are susceptible to fill sediment and have strong reservoir heterogeneity.The production values of paleochannel reservoirs are various with different filling characteristics.It has always been a difficult technical problem to quantity internal filling characteristics of paleochannel in exploration and development.This paper takes a typical paleochannel in Tahe oilfield as the research object.From the perspective of prestack inversion, it introduces a quantitative description method of filling characteristics of karst paleochannel.Firstly, the logging curves intersection analysis of the typical paleochannel is used to clarify the relationships among elastic parameters, porosity and filling materials content.Based on this, the pre-stack elastic inversion technology is used to obtain elastic parameters, which are used as input data.Reservoir physical property inversion technology is used to obtain filling materials content.Combining with elastic parameters and filling materials content, the filling characteristics of typical channels are comprehensively described, as well as the quantitative description method of filling characteristics of paleochannel is formed.Through practical application and drilling calibration, the coincidence rate of filling degree ups to 85.2%, and the filling content is highly consistent with the logging interpretation results, which verifies the feasibility and reliability of this method, and has important guiding significance for the efficient development of karst paleochannel reservoirs.
作者
周单
吕慧
王震
ZHOU Shan;Lü Hui;WANG Zhen(Sinopec Geophysical Research Institute,Nanjing 211103,China;Exploration and Production Research Institute of Sinopec Northwest Oilfield Company,Oriimqi 830011,China)
出处
《地球物理学进展》
CSCD
北大核心
2022年第1期348-356,共9页
Progress in Geophysics
基金
国家自然科学基金企业创新发展联合基金“海相深层油气富集机理与关键工程技术基础研究”(U19B6003)
国家科技重大专项“不同缝洞储集体地震识别与预测技术”(2016ZX05014-001)联合资助。
关键词
碳酸盐岩
叠前反演
物性反演
岩溶古河道
充填特征
Carbonate rock
Prestack inversion
Petrophysical inversion
Karst paleochannel
Filling characteristic
