川东南涪陵地区石炭系黄龙组地震异常特征及其意义
|
摘要
涪陵地区位于川东南探区北部,通过该区石炭系黄龙组地震剖面测线逐条解释,识别出了四种典型异常反射结构:①地震同相轴波峰、波谷均表现为中振幅～弱振幅;②地震同相轴下拉波峰振幅有强有弱,上部波谷反射呈现强振幅～中振幅;③地震反射同相轴明显下拉,同时下拉同相轴上部反射呈现中振幅～弱振幅、下部反射振幅减弱;④地震同相轴反射为弱振幅,近空白反射或弱波谷反射。基于岩溶单元发育理论模型及该区沉积特征,对四种典型地震剖面反射异常地质成因解释进行了地球物理正演模拟,结果显示了与实际典型地震反射结构相吻合的地震剖面特征。其分别代表了岩溶高地峰丛与浅洼发育;被泥质充填或半充填的溶洞或孔隙性非常高的储层发育;高泥质含量充填物,或低速度、未被完全充填的缝洞体发育;7 m～9 m及以下的黄龙组地层。同时,基于特殊剖面结构研究成果,对该区可能发育的新型储层类型进行了预测,有效地指导了该区下部油气有利储层的寻找。
Fuling area is located in southeastern Sichuan basin.Through carefully seismic interpretation of Huanglong formation of carboniferous in Fuling area,there are four typical seismic responses in reflecting structure as follows:①The amplitude of both peak and trough of seismic are medium to weak.②Peak amplitude with phase axis pulled down present as strong or weak,and above trough amplitude is high to medium.③Seismic phase axis is pulled down clear and the amplitude is medium to weak,and amplitude is weakens lower with the seismic phase axis pulled down clear.④Seismic amplitude is weak and close to nil trace.Based on the theoretical models of karst u-nits developing and sedimentary characteristics in this area,the four seismic responses in reflecting structure which we mentioned above probably means four differ-ent geologic origins,which respectively represented:A.developing of karst positive topography and karst negative topography;B.developing karst caves that are filled by mud completely or certain mud or developing high-porosity reservoirs;C.developing fissures and caves that are filled by much mud or not entirely filled that performances low speed in seismic profiles;D.identifier of Huanglong formation which is deposited seven to nine meters or the sediment thickness is less than that.Meanwhile,the seismic forward mod-eling for the four geologic origins is matching for the four typical seismic responses in reflecting structure well.All those study results based on specific struc-ture in seismic profiles can be used to predict the new type of reservoirs and effective to search for new alter-native exploration zones for more gas discovery in Ful-ing area.
Fuling area is located in southeastern Sichuan basin.Through carefully seismic interpretation of Huanglong formation of carboniferous in Fuling area,there are four typical seismic responses in reflecting structure as follows:①The amplitude of both peak and trough of seismic are medium to weak.②Peak amplitude with phase axis pulled down present as strong or weak,and above trough amplitude is high to medium.③Seismic phase axis is pulled down clear and the amplitude is medium to weak,and amplitude is weakens lower with the seismic phase axis pulled down clear.④Seismic amplitude is weak and close to nil trace.Based on the theoretical models of karst u-nits developing and sedimentary characteristics in this area,the four seismic responses in reflecting structure which we mentioned above probably means four differ-ent geologic origins,which respectively represented:A.developing of karst positive topography and karst negative topography;B.developing karst caves that are filled by mud completely or certain mud or developing high-porosity reservoirs;C.developing fissures and caves that are filled by much mud or not entirely filled that performances low speed in seismic profiles;D.identifier of Huanglong formation which is deposited seven to nine meters or the sediment thickness is less than that.Meanwhile,the seismic forward mod-eling for the four geologic origins is matching for the four typical seismic responses in reflecting structure well.All those study results based on specific struc-ture in seismic profiles can be used to predict the new type of reservoirs and effective to search for new alter-native exploration zones for more gas discovery in Ful-ing area.
引文
[1]郑荣才,文华国,周刚,等.川东—渝北黄龙组碳酸盐岩储层的成岩系统[J].石油学报,2010,31(2):237.
[2]胡忠贵,郑荣才,文华国,等.渝东—鄂西地区黄龙组层序—岩相古地理研究[J].沉积学报,2010,28(4):696.
[3]李忠,雷雪,晏礼.川东石炭系黄龙组层序地层划分及储层特征分析[J].石油物探,2005,44(1):39.
[4]邹才能,徐春春,李伟,等.川东石炭系大型岩性地层气藏形成条件与勘探方向[J].石油学报,2010,31(1):18.
[5]四川油气区石油地质志编写组.中国石油地质志(卷十)[M].北京:石油工业出版社,1989.
[6]李忠权,冉隆辉,陈更生,等.川东高陡构造成因地质模式与含气性分析[J].成都理工学院学报,2002,29(6):605.
[7]陈宗清.川东石炭系地层─构造复合圈闭气藏的预测、分类和评价[J].石油学报,2000,21(3):25.
[8]刘树根,王允诚,张高信,等.川东大池干井高陡构造的形成机制及其对石炭系储层的影响[J].成都理工学院学报,1994,21(3):102.
[9]刘树根,王允诚,张高信,等.川东大池干井构造带上石炭统构造储层研究[J].中国海上油气(地质),1994,8(1):37.
[10]陈宗清.川东石炭系气藏分布规律与深化勘探[J].中国海上油气(地质),2001,15(3):182.
[11]JAMES N J,CHOQUETTE P W.古岩溶与油气储层[M].成都地质学院沉积所和长庆勘探开发研究院合译.成都:成都科技大学出版社,1991.
[12]文华国,郑荣才,沈忠民,等.四川盆地东部黄龙组古岩溶地貌研究[J].地质评论,2009,55(6):816.
[13]胡忠贵,郑荣才,文华国,等.川东邻水—渝北地区石炭系黄龙组白云岩成因[J].岩石学报,2008,24(6):1369.
[2]胡忠贵,郑荣才,文华国,等.渝东—鄂西地区黄龙组层序—岩相古地理研究[J].沉积学报,2010,28(4):696.
[3]李忠,雷雪,晏礼.川东石炭系黄龙组层序地层划分及储层特征分析[J].石油物探,2005,44(1):39.
[4]邹才能,徐春春,李伟,等.川东石炭系大型岩性地层气藏形成条件与勘探方向[J].石油学报,2010,31(1):18.
[5]四川油气区石油地质志编写组.中国石油地质志(卷十)[M].北京:石油工业出版社,1989.
[6]李忠权,冉隆辉,陈更生,等.川东高陡构造成因地质模式与含气性分析[J].成都理工学院学报,2002,29(6):605.
[7]陈宗清.川东石炭系地层─构造复合圈闭气藏的预测、分类和评价[J].石油学报,2000,21(3):25.
[8]刘树根,王允诚,张高信,等.川东大池干井高陡构造的形成机制及其对石炭系储层的影响[J].成都理工学院学报,1994,21(3):102.
[9]刘树根,王允诚,张高信,等.川东大池干井构造带上石炭统构造储层研究[J].中国海上油气(地质),1994,8(1):37.
[10]陈宗清.川东石炭系气藏分布规律与深化勘探[J].中国海上油气(地质),2001,15(3):182.
[11]JAMES N J,CHOQUETTE P W.古岩溶与油气储层[M].成都地质学院沉积所和长庆勘探开发研究院合译.成都:成都科技大学出版社,1991.
[12]文华国,郑荣才,沈忠民,等.四川盆地东部黄龙组古岩溶地貌研究[J].地质评论,2009,55(6):816.
[13]胡忠贵,郑荣才,文华国,等.川东邻水—渝北地区石炭系黄龙组白云岩成因[J].岩石学报,2008,24(6):1369.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心