南海北部珠二坳陷超深水区断层系统分析中的高精度相干技术

doi:10.11743/ogg20180116

摘要/Abstract

摘要： 超深水区地质条件复杂、地震资料受扰因素多、断面多解性强，严重影响了常规构造解释的准确性。在珠江口盆地珠二坳陷超深水区的断层研究中应用高精度沿层相干技术，有效提高了断裂系统解释与组合的精度。高精度沿层相干技术对超深水三维资料中特定地质时期断层的空间展布具有很好的表征。基于此技术的断裂系统相干分析指示白云超深水区的构造走向受北东向区域断裂控制明显。下渐新统恩平组顶面（T₇⁰）为区域不整合面与白云-荔湾凹陷的断-拗转换界面，恩平组沉积时期白云-荔湾凹陷具有连通性，渐新世早期断陷特征减弱，晚期以断拗-拗陷作用为主，对珠二坳陷超深水区油气成藏具有重要的控制作用。

关键词: 断层, 相干技术, 断-拗转换, 超深水, 珠二坳陷, 珠江口盆地

Abstract: The geological conditions of the ultra-deepwater area are complex, and the seismic data is disturbed by many factors.The faults have multiple interpretation solutions, so the accuracy of the structure interpretation is seriously affected.According to the fault characteristics of the 3D working area in ultra-deepwater region, the coherence technique is used for fault interpretation and fault analysis, in order to better understand and more accurately interpret the structure characteristics of the whole Baiyun Sag.It is indicated that the along-horizon coherent slice could apparently reveal the planar distribution of the fault system developed in certain periods.The top surface of Enping Formation (T₇⁰) is a regional unconformity and the rift to sag transition interface of Baiyun-Liwan Sag.The faulting and rifting phase of Baiyun Sag ended in early Oligocene, then sag and depression became the dominate characteristics afterwards.The study demonstrates that the rift to sag transition interface T₇⁰ of Baiyun-Liwan Sag has significant control on hydrocarbon accumulation in the ultra-deepwater area of ZhuⅡDepression.

Key words: fault, coherence technique, rift to sag transition, ultra-deepwater area, ZhuⅡDepression, Pearl River Mouth Basin

中图分类号:

TE132.1

赵钊,汤良杰,赵志刚,等. 南海北部珠二坳陷超深水区断层系统分析中的高精度相干技术[J]. 石油与天然气地质, 2018, 39(1): 165-174. doi: 10.11743/ogg20180116 Zhao Zhao,Tang Liangjie,Zhao Zhigang,et al. High-precision coherence technique in fault system analysis in ultra-deepwater area of the ZhuⅡDepression, northern South China Sea[J]. Oil & Gas Geology, 2018, 39(1): 165-174. doi: 10.11743/ogg20180116

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