运用频谱分解技术预测东印尼Seram岛Oseil油田碳酸盐岩储层的裂缝展布
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摘要
位于东印尼Seram岛上的Oseil油田是侏罗系Manusela碳酸盐岩裂缝型油藏,油气的分布严格受控于裂缝的展布和发育程度。本文运用频谱分解技术对该区的断裂系统分布和微裂缝的展布规律进行了研究。通过对Manusela层反射特征的分析和裂缝型储层正演模型模拟,总结出碳酸盐岩裂缝型储层的地震响应特征。选择最能反映目标层断层特征的40ms时窗制作了频率调谐体和时频四维体。频率调谐体分析表明,研究区中部和南部发育两组交叉的断裂体系,北部发育一组断裂体系,断层的附近裂缝较为发育,裂缝的展布严格受控于断层的发育。时频四维体从空间上雕刻出了断层和裂缝的分布,裂缝具有表层较发育、深层发育较差的特征,但两者的深层裂缝分布规律比较一致。频谱分解技术预测的结果与钻探结果较为吻合,表明此法有广阔的应用前景。
The Oseil Oilfield in Seram Island of eastern Indonesia is fractured reservoir of Jurassic Manusela carbonate,the oil/gas distribution is strictly controlled by the distribution and development of fracture.Using spectrum decomposition technique,the paper studied the distributing of fault system and distribution rule of micro-fracture;summarized the feature of seismic response on fractured reservoir of carbonate by analyzing the reflection feature of Manusela bed and forward simulating the model of fractured reservoir;and making frequency tuning volume and 4-D time-frequency volume by selecting 40ms time-window that is able to reflect the fault feature of target.It is shown by analyzing the frequency tuning volume that the two sets of cross fault systems developed in central and southern parts of studied area respectively and a set of fault system in northern part;the fractures around fault developed and distribution of fracture is strictly controlled by the development of fault.The 4-D time-frequency volume described spatially the distribution of fault and fracture,and the later is characteristic of better development in subsurface and less development in deep.The distributing rule of deep fracture in both frequency tuning volume and 4-D time-frequency volume is more coincident.The results predicted by spectrum decomposition are identical to the drilling results,showing that the method has broad application prospect.
The Oseil Oilfield in Seram Island of eastern Indonesia is fractured reservoir of Jurassic Manusela carbonate,the oil/gas distribution is strictly controlled by the distribution and development of fracture.Using spectrum decomposition technique,the paper studied the distributing of fault system and distribution rule of micro-fracture;summarized the feature of seismic response on fractured reservoir of carbonate by analyzing the reflection feature of Manusela bed and forward simulating the model of fractured reservoir;and making frequency tuning volume and 4-D time-frequency volume by selecting 40ms time-window that is able to reflect the fault feature of target.It is shown by analyzing the frequency tuning volume that the two sets of cross fault systems developed in central and southern parts of studied area respectively and a set of fault system in northern part;the fractures around fault developed and distribution of fracture is strictly controlled by the development of fault.The 4-D time-frequency volume described spatially the distribution of fault and fracture,and the later is characteristic of better development in subsurface and less development in deep.The distributing rule of deep fracture in both frequency tuning volume and 4-D time-frequency volume is more coincident.The results predicted by spectrum decomposition are identical to the drilling results,showing that the method has broad application prospect.
引文
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[2]徐伯勋,白旭滨等.地震勘探信息技术.北京:地质出版社,2001,114～134
[3]曹正林,赵应成,刘全新等.勘探阶段岩性气藏描述与预测技术思路及技术体系.天然气工业,2001,21(6):42～45
[4]朱庆荣等.分频解释技术在表征储层中的运用.矿物岩石,2003,23(3):104～108
[5]董臣强,王军,张金伟.时频分析技术在三角洲层序分析中的应用.断块油气田,2002,9(2):18～20
[6]蔡正旗,蔡矿,徐志明等.川东三岔坪潜伏构造石炭系储层特征及有利区预测.天然气地球科学,2005,16(6):715～718
[7]陈科贵,张帆,冯雪龙等.双家坝构造碳酸盐岩储层参数评价.西南石油学院学报,2005,27(6):12～14
[8]王世星,曹辉兰,勒文芳等.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.石油物探,2005,44(5):421～425
[9]杨凤丽,王清,沈财余.碳酸盐岩储层地震信息响应及横向预测.同济大学学报(自然科学版),2005,33(9):1235～1239
[10]张亚中,鲁新便等.频谱分解技术在塔里木盆地北部TH地区碳酸盐岩缝洞型储层预测中的应用.石油地球物理勘探,2006,41(增刊):16～20
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