准噶尔盆地腹部永1井区层间断层处理技术
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摘要
勘探表明,准噶尔盆地发现的绝大部分油气来源于深部二叠系烃源岩。由于盆地腹部深层层间断层一般断距较小、断点难以确定,利用常规地震资料难以识别与描述,因而无法对油气运移及富集区域做出准确预测。本文针对影响描述层间小断层的因素采取了多项有针对性的措施:通过采用叠前时间偏移技术改善层间断层成像,为准确识别与描述层间断层奠定基础;通过地层倾角扫描技术细致刻画小断层;利用优势频带分频相位技术较好地实现了宽频带地震资料的断裂系统识别。综合利用上述方法准确识别与描述了永1井区深层层间断层,取得了良好的效果。
The exploration showed that the majority of oil and gas discovered in Junggar basin came from the deep Permian source rock. Because the deep in-terbed fault amplitude is generally small in hinterland of Junggar basin, which made the fault position be difficult to be defined,and was difficult to be identified and described by using common seismic data,so that the oil/gas migration and accumulation zone were unable to correctly predicted. Facing the factors having influence on describing minor interiayer faults, the paper adopted multiple purposeful measures: using prestack time migration to improve the interiayer fault imaging,laying the foundation for correct identification and description of interiayer faults; fine description of minor faults by dip scanning technique; using frequency-shared phase technique of dominant band to carry out the identification of faulted system in seismic data with wide band. Integrative usage of abovementioned approaches correctly identified and described the deep interiayer faults in Yong-1 well zone, achieving good results.
The exploration showed that the majority of oil and gas discovered in Junggar basin came from the deep Permian source rock. Because the deep in-terbed fault amplitude is generally small in hinterland of Junggar basin, which made the fault position be difficult to be defined,and was difficult to be identified and described by using common seismic data,so that the oil/gas migration and accumulation zone were unable to correctly predicted. Facing the factors having influence on describing minor interiayer faults, the paper adopted multiple purposeful measures: using prestack time migration to improve the interiayer fault imaging,laying the foundation for correct identification and description of interiayer faults; fine description of minor faults by dip scanning technique; using frequency-shared phase technique of dominant band to carry out the identification of faulted system in seismic data with wide band. Integrative usage of abovementioned approaches correctly identified and described the deep interiayer faults in Yong-1 well zone, achieving good results.
引文
[1]鲁兵,徐可强等.准噶尔盆地断裂活动与油气运聚的关系.新疆石油地质,2003,24(6):502～504
[2]雷德文,唐建华等.准噶尔盆地莫北地区小断裂的正演模拟与识别.新疆石油地质,2002,23(2):111～113
[3]曹孟起,刘占族.叠前时间偏移处理技术及应用.石油地球物理勘探,2006,41(3):286～289
[4]张延庆,魏晓东等.谱分解技术在QL油田小断层识别与解释中的应用.石油地球物理勘探,2006,41(5):584～591
[2]雷德文,唐建华等.准噶尔盆地莫北地区小断裂的正演模拟与识别.新疆石油地质,2002,23(2):111～113
[3]曹孟起,刘占族.叠前时间偏移处理技术及应用.石油地球物理勘探,2006,41(3):286～289
[4]张延庆,魏晓东等.谱分解技术在QL油田小断层识别与解释中的应用.石油地球物理勘探,2006,41(5):584～591
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