摘要
塔里木盆地顺北5号走滑断裂及其伴生裂缝的分布控制了储层的形成和油气的运聚成藏。如何选择对裂缝储层响应好的地震属性并用其描述储层的空间展布,是裂缝型储层预测的研究基础。由于研究区不同尺度断裂裂缝发育规模差异较大及客观上存在地震分辨率的差异,在实际研究过程中需要采用不同的技术方法及其组合对不同尺度和特征的断裂裂缝进行识别。地震属性对比测试表明倾角约束的高精度相干体和面状特征属性可表征断距超过40 m的大尺度断裂;分频融合相干和应变能属性可表征断距15~40 m的中尺度断裂;断裂似然体刻画和缝洞增强体可表征断距15 m以下的小尺度断层和裂缝。然后将典型地震属性与成像测井解释得到的实际裂缝数据及裂缝密度曲线进行相关性拟合,进而优选出混沌属性、面状属性、结构张量第三分量、分频融合相干4种属性,并将4种属性融合成新的属性用于裂缝密度体计算,最后用该方法半定量预测裂缝的分布。裂缝预测结果表明以走滑断裂带中部的压扭性断裂处为中心,约1.5 km范围的鹰山组下段地层整体裂缝最为发育,为优势储层勘探开发区。
The Shunbei No.5 strike-slip fault and its associated fractures in Tarim Basin control the formation of reservoirs and impact the migration and accumulation of oil and gas.Selecting appropriate seismic attributes to characterize and describe the spatial distribution of fractured reservoirs plays an important role in fractured reservoir prediction.Due to the seismic resolution of faults and fractures at different scales,it is necessary to use different methods and their combinations to identify fractures at different scales.To further characterize the fractures that associated with strike-slip faults in the Shunbei area in Tarim Basin,this paper compares the capability characterizing faults and fractures of individual seismic attributes and their combined attributes.The seismic attribute comparison shows that the high-precision coherent volume that constrained by dip angle and plane feature attribute can characterize the large-scale faults with fault distances over 40 m.The multi-coherent merge and strain-energy attributes can represent mesoscale fractures with a fault distance of 40-15 m.In addition,fracture-gave gain and thin likelihood enhancer can characterize small-scale fractures with a fault distance less than 15 m.The results of correlation fitting of typical seismic attributes to actual fracture data and fracture density curves that interpreted from EMI imaging logging were ranked.Finally,four seismic attributes including chaos,planes,third component of structural tensor,and frequency division coherence fusion are optimized for fracture density calculation.The calculated results show that the potential reservoirs that associated with the high-density fracture zone is mainly located within 1.5 km of the transpression section of the fault in the upper section of the lower to middle Ordovician Yingshan Formation.
作者
刘军
龚伟
黄超
李伟
李弘艳
董晓彬
蒋恕
Liu Jun;Gong Wei;Huang Chao;Li Wei;Li Hongyan;Dong Xiaobin;Jiang Shu(SINOPEC Northwest Oil Company,Urnmqi 830011,China;School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2022年第4期1-11,共11页
Bulletin of Geological Science and Technology
基金
中国石油化工股份有限公司西北油田分公司科研项目(34400008-19-ZC0613-0022)。
关键词
断裂裂缝
超深层碳酸盐岩储层
裂缝密度
地震属性
走滑断裂带
塔里木盆地
faults and fracture
ultradeep carbonatite reservoir
fracture density
seismic attribute
strike-slip fault zone
Tarim Basin
