四川盆地盆-山耦合系统和沉积响应特征
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大型油气田及煤层气开发,编号:2008ZX05000-003-01


Sedimentary Response to the Coupling Process Between Basin and Mountain of Sichuan Foreland Basin
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    摘要:

    依据四川盆地晚三叠世须家河期至白垩纪盆地构造和沉积演化史的综合分析结果,认为该盆地属于发育在大型周缘前陆盆地基础上的陆内压性叠合盆地,具类前陆盆地性质。盆地形成和演化受周边龙门山、米仓山-大巴山和雪峰山3个造山带多期次非同步异方位的逆冲推覆活动控制,可划分为分别受控于盆缘造山带逆冲推覆作用控制的川西、川东北和川东南3个盆-山耦合次系统,区域上构成了独具特色的“三坳围一隆”构造-沉积格局。对应各造山带异方位的交替逆冲推覆活动,盆-山耦合过程又可划分为早期周缘前陆盆地(T3m→T3xt)、中期类前陆盆地(T3x→J3)、晚期萎缩衰亡(K)3个演化阶段,各演化阶段盆-山耦合过程的沉积学响应具特殊的异同性,差异性为对应各造山带逆冲推覆应力方位的变化,各亚阶段沉降-沉积中心位置各异,往复迁移于川西、川东北和川东南3个坳陷带,相似性为各次系统地层分布都呈自前缘坳陷带向前隆斜坡带和前陆隆起带上超和减薄变细的楔状体,具有相似的沉积组合、相带展布规律和油气地质特征。

    Abstract:

    According to multidisciplinary analysis of the basin texture and tectonic-sedimentary evolutionary history from Upper Triassic Xujiahe Formation to Cretaceous in Sichuan basin, it can ascertain that the basin belongs to intracontinental convergence basin which develops on the basis of large peripheral foreland basin, and it has the features of analogous forland basin. Formation and evolution of the basin are controlled by polychronic and nonsynchronous thrusting-napping process of Longmenshan, Micangshan-Dabashan and Xuefengshan. In term of thrusting, napping, deroofing, subsidence of foredeep geotectogene, lateral growth, and material circular relationship of packing action in each orogenic belt, the evolution of the basin is divided into three secondary systerms, which are western Sichuan, northeast Sichuan, and southeast Sichuan. It formed a peculiar tectonic-sedimentary pattern, which is called “three depressions around one uplift”. Corresponding to the thrusting-napping alternative activity in each orogenic belt, the tectonic evolution can be divided into three evolutionary phases, which are early peripheral foreland basin, middle Analogous forland basin, and late atrophy phase. According to the main factors of coupling process between basin and mountain, the middle Analogous forland basin can be subdivided into Longmenshan Analogous forland basin(T3x), Micangshan-Dabashan Analogous forland basin(J1→J2), and Longmengshan-Xuefengshan composite Analogous forland basin(J3). The late atrophy phase can be subdivided into atrophy (K1) and consumption phase(K2→K3). The sedimentary response to coupling process between basin and mountain in each evolutionary phase is of particular similiarities and differences. The differences are that different thrusting-napping stress positions in each orogenic belt have different subsidence-depocencer positions, and the evolutionary features which are moving back and forth among western Sichuan depression, northeast Sichuan depression, and southeast Sichuan depression. The similiarities express that stratigraphic distribution of coupling process between basin and mountain in different phases has the features of onlap and wedge shape which is become thinner from the front geotectogene, forebulge ramp region to foreland uplift zone. It also has similar combinations of sedimentary facies, distribution rules of facies belts, and petroleum geologic characteristics.

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郑荣才,李国晖,戴朝成,李楠,王昌勇.2012.四川盆地盆-山耦合系统和沉积响应特征[J].地质学报,86(1):170-180.
zhengrongcai, LI Guohui, DAI Chaocheng, LI Nan, WANG Changyong.2012. Sedimentary Response to the Coupling Process Between Basin and Mountain of Sichuan Foreland Basin[J]. Acta Geologica Sinica,86(1):170-180.

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  • 收稿日期:2009-12-14
  • 最后修改日期:2009-12-14
  • 录用日期:2010-02-09
  • 在线发布日期: 2012-01-06
  • 出版日期: