从地震信息看油气地质扭动构造的六大特征——兼述中国东部和中—西部典型扭动构造样式
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摘要
中国东部和中—西部含油气盆地内构造样式在平面上多为雁列展布,在构造演化过程中都注入了扭动因素。归纳出了扭动构造的六大地震地质特征,如扭断裂带主断面产状近于直立插入基底,向上向外撒开呈花状结构;花状结构的花枝呈喇叭口形弯曲;扭断裂带两侧同期构造及断裂呈雁列式展布等。中国东部第三纪以拉张翘倾运动为主,贯穿其内的郯庐断裂具有一定程度的扭动性质,使得中国东部的构造存在扭动因素,如济阳坳陷张扭性帚状构造样式、黄骅“入”字形断裂构造样式等。中国中—西部扭动构造的形成,受红河、阿尔金等断裂的影响,从河内盆地的扭动痕迹可以推测莺歌海盆地也具有扭动属性;沿阿尔金主断裂南缘派生的一组近东西向断裂呈右旋雁列。塔里木盆地的东西向断裂构造带以挤压为主,北西向形成右旋性质的压扭构造带,北东向则为左旋性质的压扭构造带。
The styles of structure systems are generally en echelon-distributed in plane in petroliferous basins in Eastern part and Central-Western part of China,which commonly resulted from shearing during tectonic evolution.Six typical features of shearing structure systems are summarized based on various styles of seismic structures in these regions by seismic profiles interpretation,such as extensional υ-type structural systems in Jiyang Depression and the λ-type fracturing structural systems in Jiyang Depression in Bohaiwan Basin during Tertiary pull-apart movement.The W-E-trending fracturing belts are common compressive but the NW-trending ones are right-lateral and NE-trending ones are left-lateral compresso-shearing structural systems in Tarim Basin under the effects of Honghe and Altun megafratures.
The styles of structure systems are generally en echelon-distributed in plane in petroliferous basins in Eastern part and Central-Western part of China,which commonly resulted from shearing during tectonic evolution.Six typical features of shearing structure systems are summarized based on various styles of seismic structures in these regions by seismic profiles interpretation,such as extensional υ-type structural systems in Jiyang Depression and the λ-type fracturing structural systems in Jiyang Depression in Bohaiwan Basin during Tertiary pull-apart movement.The W-E-trending fracturing belts are common compressive but the NW-trending ones are right-lateral and NE-trending ones are left-lateral compresso-shearing structural systems in Tarim Basin under the effects of Honghe and Altun megafratures.
引文
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[3]李本才,刘鸿友,杜怀旭,等.伊通盆地含油气系统与油气藏[J].中石油勘探,2003,8(3):38-44.
[4]蔡希源,王同和,迟元林,等.中油气区反转构造[M].北京:石油工业出版社,2001.
[5]蔡舜天,郭亦秋.广西百色盆地石油地质概述[J].石油与天然气地质,1984,5(4):362-371.
[6]郑孟林,曾春潮,李明杰,等.阿尔金断裂带东南缘含油气盆地群的形成]化[J].地质论评,2003,49(3):277-285.
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