尼日尔三角洲盆地泥收缩构造发育特征及对沉积的控制

发布时间：2018-06-05 23:10

本文选题：尼日尔三角洲盆地 + 泥收缩构造　；参考：《海相油气地质》2017年04期

【摘要】：泥收缩构造是发育在尼日尔三角洲盆地深水区的典型构造样式,属重力滑脱冲断构造,主要构造类型有冲断裂、塑性泥构造及相关褶皱和正断裂。基于地震地质解释,结合构造发育史分析,认为泥收缩构造主要受塑性泥构造控制,在中新世托尔托纳(Tortonian)晚期开始活动,中新世墨西拿期(Messinian)—上新世赞克勒期(Zanclean)达到最强,之后构造活动逐渐减弱,但至今仍在活动。通过古构造恢复,结合沉积展布分析,认为中新世托尔托纳晚期沉积开始受构造活动控制,托尔托纳阶上部及以上地层具有明显的同沉积特征,泥收缩构造相关的冲断裂上升盘厚度明显小于下降盘厚度,褶皱两翼的地层厚度明显厚于中间背斜顶部的地层厚度。
[Abstract]:Mud shrinkage structure is a typical tectonic style developed in the deep water area of Niger Delta basin, which belongs to gravity detachment and thrust structure. The main structural types are thrust faults, plastic mud structures and related folds and normal faults. Based on the seismic geological interpretation and the analysis of tectonic development history, it is concluded that the mud-shrinking structure is mainly controlled by the plastic mudstone structure, which began to active in the late Miocene Tortonian (Tortonian), and reached the highest level in the Miocene period of Messina and Pliocene Zancleanin the Koehler period. Since then tectonic activity has gradually weakened, but is still active. Through paleotectonic restoration and sedimentary distribution analysis, it is concluded that the late Miocene Tortona sediments were controlled by tectonic activity, and the upper and higher Toltona stratigraphy have obvious synsedimentary characteristics. The thickness of the uplift plate is obviously smaller than that of the descending plate, and the thickness of the two flanks of the fold is obviously thicker than that of the top of the middle anticline.
【作者单位】：中海油研究总院;长江大学;
【基金】：国家科技重大专项“非洲、中东重点勘探区油气地质评价及关键技术研究”(2011ZX05030-003)资助
【分类号】：P618.13

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