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松南凹陷是琼东南盆地新生代构造活动最强烈的凹陷,是研究深水区大中型油气田成藏规律的典型凹陷。在对该凹陷主干剖面进行精细解释的基础上,全面描述了其构造沉积形式,并把松南凹陷演化划分为4个重要幕即始新世—早渐新世早期整体断陷幕、早渐新世晚期—晚渐新世局部断陷幕、晚渐新世晚期—中新世统一坳陷幕和中新世中期—第四纪新构造运动幕,阐述了各个演化幕的基本特点和重点构造沉积现象的成因,认为:自第二构造幕开始,除了F2断裂带,凹陷的其他基底断层基本停止活动,取而代之的是一些向凹陷方向倾斜的新断裂体系;区域坳陷期自T61沉积就开始,甚至更早;而上新世和第四纪并不是趋于沉寂,新构造运动主宰了凹陷的演化形式。最后分析了各构造幕构造运动对油气勘探的重要意义。
Songnan sag is the strongest diagenesis of Cenozoic tectonic activity in the Qiongdongnan Basin, and is a typical depression for studying the accumulation pattern of large and medium-sized oil and gas fields in the deep-water area. Based on the fine interpretation of the main section of the depression, the tectonic sedimentary forms are fully described, and the evolution of the Songnan depression is divided into four important episodes: the Eocene-Early Oligocene whole fault cutoff, Late Late Oligocene Fault Depression, Late Late Oligocene-Miocene Uniform Depression and Meso-Mid-Miocene Neotectonic Motion Curtain, the basic characteristics and key tectonics of each evolutionary curtain are expounded The reason of sedimentary phenomenon is that from the second tectonic curtain, except for the F2 fault zone, other basal faults in the depression basically ceased to be active, replaced by some new fault systems inclined to the dipping direction. The regional depression period started from T61 deposition , And even earlier; and the Pliocene and Quaternary are not quiet, the new tectonic movement dominated the evolution of the depression. Finally, the significance of tectonic movement of tectonic curtain to hydrocarbon exploration is analyzed.