珠江口盆地白云凹陷伸展拆离断层系及构造演化
发布时间：2018-10-16 16:18
【摘要】：白云凹陷是南海北部深水区已证实的地质条件最优越的富生烃凹陷,但前人对白云凹陷的研究在构造、沉积和成因机制上存在争议。近年来采集的高品质地震资料有效提高了白云凹陷地震反射界面识别、结构特征、沉积充填和构造演化研究的可靠性。选取白云凹陷为研究对象,将均匀岩石圈塑性变形的伸展拆离作用应用于白云凹陷的构造解析,在地震资料解释基础上,以拆离断层的厘定、理论模型与动力学分析为主要工作思路,进而阐明构造演化及其油气地质意义。白云凹陷11条控洼断层可厘定为拆离断层系,剖面上表现为多期正断层呈铲状,向下合并为一条大规模低角度正断层,晚期被差异抬升作用改造的特征;平面上具有波瓦状构造特征。拆离作用控制了白云凹陷的构造演化和沉积充填,白云凹陷经历拆离断陷期、断拗复合期和区域沉降期3个阶段构造演化;拆离作用及其之后的持续性区域沉降作用,使白云凹陷成为南海北部深水区面积最大、沉积最厚的凹陷;同时也控制了文昌组和恩平组主要烃源岩的分布和演化。
[Abstract]:Baiyun Sag is the most favorable hydrocarbon generating sag in the deep water area of the northern South China Sea, but the previous researches on Baiyun Sag are controversial in terms of structure, sedimentation and genetic mechanism. The high quality seismic data collected in recent years have effectively improved the reliability of seismic reflection interface identification, structural characteristics, sedimentary filling and structural evolution in Baiyun sag. Taking Baiyun sag as the research object, the extension and detachment of plastic deformation of homogeneous lithosphere is applied to the structural analysis of Baiyun sag. On the basis of seismic data interpretation, the determination of detachment fault is carried out. The theoretical model and dynamic analysis are the main working ideas, and then clarify the tectonic evolution and its significance in oil and gas geology. The plane has the characteristic of wave-tile structure. The structural evolution and depositional filling of Baiyun sag are controlled by the detachment process. The structural evolution of Baiyun sag has experienced three stages: the detachment fault depression period, the fault depression composite period and the regional subsidence stage, and the detachment process and its continuous regional subsidence. Baiyun sag is the largest deep water area and thickest sedimentary depression in the northern South China Sea and controls the distribution and evolution of the main hydrocarbon source rocks of Wenchang formation and Enping formation.
【作者单位】： 中海油研究总院;
【基金】：国家自然科学基金(编号:91528303) 国家重大科技专项(编号:2016ZX05026007) 南海北部深水区天然气资源战略调查及评价项目(编号:XQ-2004-05;XQ-2007-05)联合资助
【分类号】：P618.13
[Abstract]:Baiyun Sag is the most favorable hydrocarbon generating sag in the deep water area of the northern South China Sea, but the previous researches on Baiyun Sag are controversial in terms of structure, sedimentation and genetic mechanism. The high quality seismic data collected in recent years have effectively improved the reliability of seismic reflection interface identification, structural characteristics, sedimentary filling and structural evolution in Baiyun sag. Taking Baiyun sag as the research object, the extension and detachment of plastic deformation of homogeneous lithosphere is applied to the structural analysis of Baiyun sag. On the basis of seismic data interpretation, the determination of detachment fault is carried out. The theoretical model and dynamic analysis are the main working ideas, and then clarify the tectonic evolution and its significance in oil and gas geology. The plane has the characteristic of wave-tile structure. The structural evolution and depositional filling of Baiyun sag are controlled by the detachment process. The structural evolution of Baiyun sag has experienced three stages: the detachment fault depression period, the fault depression composite period and the regional subsidence stage, and the detachment process and its continuous regional subsidence. Baiyun sag is the largest deep water area and thickest sedimentary depression in the northern South China Sea and controls the distribution and evolution of the main hydrocarbon source rocks of Wenchang formation and Enping formation.
【作者单位】： 中海油研究总院;
【基金】：国家自然科学基金(编号:91528303) 国家重大科技专项(编号:2016ZX05026007) 南海北部深水区天然气资源战略调查及评价项目(编号:XQ-2004-05;XQ-2007-05)联合资助
【分类号】：P618.13
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