柴达木盆地西部地区Ⅻ号断层的特征
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摘要
利用三维地震反射层的特点、沉积地层厚度的变化、油井产能的突变、地层压力系数与地层倾角的差异等参数确定了柴达木盆地西部地区Ⅻ号断层的存在,并通过构造演化分析确定了该断层的性质。柴达木盆地西部地区跃进一号构造与砂西构造之间的Ⅻ号断层早期为受拉张作用控制的正断层,后期演化为受挤压作用控制的逆断层;断层开启时是油气的运移通道,而封闭时使跃进一号构造与砂西构造形成了各自独立的油水系统,在开发过程中必须采取相应的措施才能达到稳产与提高产能的目的。
According to the strata parameters such as characteristics of three-dimensional seismic reflection,variation in thickness of sedimentary formation,abrupt capacity of oil well,and differences of formation pressure coefficient and dip angle,the existence and the property of No.Ⅻ fault in the west part of Qaidam Basin were investigated by analyzing the structural evolution. The result showed that No.Ⅻ fault existed between Yuejinyihao and Shaxi structures in the west part of Qaidam Basin.This fault was a normal fault resulted from extension in the early stage and then turned into reverse fault under extrusion.The fault was the oil-gas migration pathway when it was open.The independent oil-water system formed in Yuejinyihao and Shaxi structures when the fault was sealed.Because of existence of this fault,necessary steps should be taken to stabilize oil well yield and improve well deliverability during the development of Yuejinyihao and Shaxi oilfields.
According to the strata parameters such as characteristics of three-dimensional seismic reflection,variation in thickness of sedimentary formation,abrupt capacity of oil well,and differences of formation pressure coefficient and dip angle,the existence and the property of No.Ⅻ fault in the west part of Qaidam Basin were investigated by analyzing the structural evolution. The result showed that No.Ⅻ fault existed between Yuejinyihao and Shaxi structures in the west part of Qaidam Basin.This fault was a normal fault resulted from extension in the early stage and then turned into reverse fault under extrusion.The fault was the oil-gas migration pathway when it was open.The independent oil-water system formed in Yuejinyihao and Shaxi structures when the fault was sealed.Because of existence of this fault,necessary steps should be taken to stabilize oil well yield and improve well deliverability during the development of Yuejinyihao and Shaxi oilfields.
引文
[1]陆基孟.地震勘探原理(下)[M].东营:石油大学出版社,2004:82-90.
[2]邓康龄,余福林.川西坳陷的复合构造与油气关系[J].石油与天然气地质,2005,26(2):214-219.
[3]刘玉魁.塔里木盆地英吉苏凹陷构造演化及断层对油气成藏的控制[J].西北油气勘探,2005,17(3):15-20.
[4]蔡希源,刘传虎.准噶尔盆地腹部地区油气成藏的主控因素[J].石油学报,2005,26(5):1-4.
[5]王平在,何登发,雷振宇.中国中西部前陆盆地冲断带构造特征[J].石油学报,2002,23(3):11-17.
[6]于翠玲,曾溅辉,林承焰,等.断裂带流体活动证据的确定———以东营凹陷胜北断裂带为例[J].石油学报,2005,26(4):34-38.
[7]马丽娟,郑和荣,解习农.东营凹陷中央隆起带断裂构造及油气运移[J].石油与天然气地质,2005,26(2):246-251.
[8]尤征,顾伟康,郑大海,等.穆格莱德盆地断层倾角模式及成因探讨[J].世界地质,2005,24(2):154-160.
[2]邓康龄,余福林.川西坳陷的复合构造与油气关系[J].石油与天然气地质,2005,26(2):214-219.
[3]刘玉魁.塔里木盆地英吉苏凹陷构造演化及断层对油气成藏的控制[J].西北油气勘探,2005,17(3):15-20.
[4]蔡希源,刘传虎.准噶尔盆地腹部地区油气成藏的主控因素[J].石油学报,2005,26(5):1-4.
[5]王平在,何登发,雷振宇.中国中西部前陆盆地冲断带构造特征[J].石油学报,2002,23(3):11-17.
[6]于翠玲,曾溅辉,林承焰,等.断裂带流体活动证据的确定———以东营凹陷胜北断裂带为例[J].石油学报,2005,26(4):34-38.
[7]马丽娟,郑和荣,解习农.东营凹陷中央隆起带断裂构造及油气运移[J].石油与天然气地质,2005,26(2):246-251.
[8]尤征,顾伟康,郑大海,等.穆格莱德盆地断层倾角模式及成因探讨[J].世界地质,2005,24(2):154-160.
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