第31卷第3期 2017年6月
质
现代地 GEOSCIENCE
Vol. 31No. 3 Jun. 2017
南黄海盆地北凹多幕正反转构造特征及其动力学分析
祁鹏，王鹏，崔敏，蔡佳
（中海油研究总院，北京100028）
分别是中南部的逆冲型、东部的压扭型和北部的韬皱型，主要受控于其所处的不同构造位置。通过典型地震测线的平衡剖面分析，并结合区域构造动力学背景分析，认为北凹至少发生了三幕构造正反转，主要受控于不同地质时期太平洋板块对欧亚大陆俯冲速度和角度的改变。其中，三垛组沉积之后，太平洋板块俯冲角度逐步由北西向转为南西西向，并且俯冲度明显增大，使得北凹处于北东南西向挤压环境中，广泛发育正反转构造，这也是最强烈的一幕正反转表现为强烈的逆断层活动和地层剥蚀。过度的正反转作用可能对北凹油气藏的形成造成了不利的影响。
关键词：正反转构造；构造样式：构造演化：南黄海盆地
中图分类号：P548；TE121.2
文献标志码：A
文章编号：10008527(2017)03044307
Tectonic Characteristics and Dynamical Analysis of Episodic Positive
InversionintheNorthSagofSouthYellowSeaBasin
QI Peng，WANG Peng，CUI Min，CAI Jia(CNO0C Research Center, Bejing100028, China)
Abstract : Three types of positive inversion structures are found in the North Sag of South Yellow Sea Basin with interpretation of reprocessed 2D seismic data. They are classified into three types : the reversed fault type in the central and southem part, the transpressional type in the eastem part and the compressional fold type in the northern part. Where the inversion structures located was depended on the different tectonic positions. Based on the integrated analysis of balance sections of the typical seismic profiles and the regional tectonic background, it was considered that three episodic positive inversions had happened in the North Sag at least, which were influ-enced by the change of the subduction angle and rate from the Pacific plate to the Eurasian continent during the Cenozoic period. After the Sanduo Formation deposited, the subduction direction of the Pacific plate changed from NW to SWW and the subduction rate increased twice nearly. This change caused the most intensely posi-tive inversion episode of the North Sag because of the SWW compressional force from the Pacific plate, which presented the strongest reversely faulting and erosion. Meanwhile, the excessively positive inversion may not be good for the hydrocarbon accumulation in the North Sag.
Key words: positive inversion; structure style; tectonic evolution; south Yellow Sea Basin
0引言
反转构造是继伸展构造、逆冲构造和走滑构
点之一。在全世界范围内的含油气盆地中发现了多个由于构造反转而形成的重要油气田，如马来盆地、北海盆地、东海盆地、松辽盆地等。GLEN-
热NIE和BEGNER(]首次将反转构造定义为“盆地逆
造之后，20世纪80年代以来构造地质学的研究热
收稿日期：2016-08-14；改回日期：2016-12-20；责任编辑：潘令枝。
基金项目：国家科技重大专项"中国近海富烃凹陷优选与有利勘探方向预测"（2016ZX05024-002）。
作者简介：祁鹏，男，工程师，1983年出生，能源地质工程专业，主要从事盆地分析及石油地质综合研究工作。
Email ; qipeng, 1983@ 163. com。