MARINE SEDIMENTARY SEQUENCES AND MAJOR GAS FIELDS IN CHINA
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摘要: 通过埋藏史、构造沉降史恢复以及以破裂弹性薄板末端单点负载挠曲为模型对库车中新生代前陆盆地的宽度、前缘隆起和造山带高度、岩石圈性质的模拟计算,综合前人研究成果表明:(1)三叠-侏罗纪、早白垩世的原始沉积展布呈北东向;(2)构造沉降曲线在北部呈陡缓陡的3段式,往南渐变为缓陡缓陡的4段式,并均具上凸的特点;(3)盆地演化早期(P2-T)和晚期(N-Q)的横向沉积结构呈典型前陆盆地的楔状几何形态,演化中期(J-E)则呈不对称的“V”字形几何形态。Abstract: Height of forebulge and orogenic belt and width of the Kuqa foreland basin have been calculated in the burial and tectonic subsiding history recovery on the base of flexural profile equation for a broken、thin、infinite、elastic plate. The results indicated:(1) The original sedimentation distribution in the Triassic-Jurassic and the Early Cretaceous appeared east-north orientation; (2) The tectonic subsiding curves can be divided into three sections of "steep-gentle-steep" at north of the Kuqa foreland basin, but it was turn into four sections of "gertle-step-gentle-steep" at south parts; (3) The transect profiles of sedimentation structure in the Kuqa foreland basin showed a typical "doorstop" wedge shape in the Early(P2-T) and Later(N-Q) periods, but a asymmetric "V" shape in the medium periods(J-E).
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[1] 艾伦 P A, 艾伦 J R.盆地分析——原理与应用[M].北京:石油工业出版社,1995. [2] 陈发景.新疆塔里木盆地北部构造演化与油气关系[M].北京:地质出版社,1996. [3] 陈荣林,朱宏发,陈跃,等.塔里木盆地中新生界沉积特征与石油地质[M].南京:河海大学出版社,1995. [4] DeClles P G, Giles K A. Foreland system[M]. Basin Research,1996,8(2). -
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