基于正演模型的地震相识别溶洞充填技术——以塔河油田12区东奥陶系储层为例
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摘要
尝试采用正演和地震相方法对塔河油田12区东奥陶系埋深较大的碳酸盐岩岩溶缝洞型储层的充填性进行识别。根据该区地层和缝洞特征,建立精细的地层模型;并根据缝洞的大小、发育位置、充填性建立相应的溶洞充填性地质模型;在此基础上,建立了8种类型溶洞充填地质剖面,通过正演获得相应的地震剖面;将正演获得的地震剖面与实钻井剖面进行对比,获得不同类型溶洞在地震相上的响应特征。统计表明,应用基于正演模型的地震相识别溶洞充填性的可靠程度达86%,为该区建立起一套有效的缝洞充填性识别方法。
Forward modeling and seismic facies were used to identify the cavern fillings of deep buried Ordovician carbonate karst reservoirs in the eastern Block 12 of Tahe oilfield. Accurate strata models were built firstly according to the formations and characteristics of fractures and caves. Based on the sizes,development positions and fillings of fractures and caves,eight kinds of geologic models with cavern fillings were established. Then,the eight corresponding seismic sections were obtained by forward modeling. Through comparing the forward seismic sections with the real drilling profiles,the seismic facies response characteristics of various caves with different fillings were concluded. By statistics,the reliability of using seismic facies based on forward modeling to identify karst cavern fillings can reach 86%. An effective identification method of fracture-cave fillings was established.
Forward modeling and seismic facies were used to identify the cavern fillings of deep buried Ordovician carbonate karst reservoirs in the eastern Block 12 of Tahe oilfield. Accurate strata models were built firstly according to the formations and characteristics of fractures and caves. Based on the sizes,development positions and fillings of fractures and caves,eight kinds of geologic models with cavern fillings were established. Then,the eight corresponding seismic sections were obtained by forward modeling. Through comparing the forward seismic sections with the real drilling profiles,the seismic facies response characteristics of various caves with different fillings were concluded. By statistics,the reliability of using seismic facies based on forward modeling to identify karst cavern fillings can reach 86%. An effective identification method of fracture-cave fillings was established.
引文
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[3]康志宏,郭春华,伍文明.塔河碳酸盐岩缝洞型油藏动态储层评价技术[J].成都理工大学学报,2007,34(2):143-146.
[4]韩剑发,周锦明,敬兵,等.塔中北斜坡鹰山组碳酸盐岩缝洞储集层预测及成藏规律[J].新疆石油地质,2011,32(3):281-284.
[5]王世星,曹辉兰,靳文芳,等.碳酸盐岩缝洞系统地震响应特征分析和塔中卡1区缝洞储层预测[J].石油物探,2005,44(5):421-427.
[6]马中高,管路平,贺振华,等.利用模型正演优选地震属性进行储层预测[J].石油学报,2003,24(6):35-39.
[7]姚清洲,孟祥霞,张虎权,等.地震趋势异常识别技术及其在碳酸盐岩缝洞型储层预测中的应用-以塔里木盆地英买2井区为例[J].石油学报,2013,34(1):101-106.
[8]韩革华,漆立新,李宗杰,等.塔河油田奥陶系碳酸盐岩缝洞型储层预测技术[J].石油与天然气地质,2006,27(6):860-878.
[9]徐微,蔡忠贤,贾振远,等.塔河油田奥陶系碳酸盐岩油藏溶洞充填物特征[J].现代地质,2010,24(2):287-293.
[10]陈琳,康志宏,李鹏,等.塔河油田奥陶系岩溶型碳酸盐岩油藏储集空间发育特征及地质模式探讨[J].现代地质,2013,27(2):356-365.
[11]孙萌思,刘池洋,杨阳,等.塔里木盆地塔中地区鹰山组碳酸盐岩缝洞型储层地震正演模拟研究[J].地学前缘,2017,24(5):339-349.