DISPLACEMENT CALCULATION FOR STRIKE-SLIP FAULT BASED ON CORRELATION OF STRATA THICKNESS TENDENCY: A CASE FROM THE LIAODONG FAULT, OFFSHORE BOHAI BAY
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摘要:
作为郯庐断裂带东支的重要组成部分，辽东断裂穿越渤海湾盆地辽东湾坳陷东部，属于晚期形成的经典平直型走滑断裂。近年来，沿其周围发现了多个油田和含油气构造，而缺少精细求取海域走滑断裂走滑位移量的方法一直是制约该区域成藏条件分析的难点。基于最新的三维连片地震资料精细解释，依据构造特征及变形机制将辽东走滑断裂分为北、中、南3段，提出一种新方法——通过互相关系数对走滑断裂两盘地层厚度变化趋势进行相似性分析，结合被错动沉积体范围恢复进行验证，定量求取出各段不同时期的走滑位移量。结果表明，辽东走滑断裂从东营组至今走滑速率逐渐减弱，且由北至南走滑变形经历了“强—弱—强”的过程。结合钻井资料，辽东走滑断裂北段和南段由于较大的走滑位移量让其具有较强的侧向封闭能力，其控制形成的圈闭也更有利于油气运聚，具有良好的成藏潜力。
Abstract:The Liaodong fault, located in the northeast Bohai Bay Basin, is a straight strike-slip fault formed in Late Eocene. Facts prove that the slipping of fault has a tremendous impact on the distribution of oil and gas in the region. However, the displacement of the strike-slip fault is always difficult to calculate in offshore areas for quantitative fault analysis due to various limitations. It also restricts detailed analysis of reservoir-forming conditions. Based upon the interpretation of structural features from the newly merged 3D seismic data, the Liaodong fault could be subdivided into three sections, i.e. the northern, middle, and southern sections. A new method was then adopted to analyze the similarity of strata-thickness variations trend on the two walls of the fault with the correlation coefficient. Some displaced sedimentary bodies are restored and used to check the calculated displacement with seismic attributes. The results are dependable, upon which the displacements of the Liaodong strike-slip fault in different periods and sections are acquired quantitatively. Combined with drilling data, it is confirmed that the strike-slip fault in northern Liaodong, where occur large displacement, has good fault sealing ability. Similar to the north, traps in the south are also favorable for hydrocarbon accumulation, due to good fault sealing conditions.
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表 1 辽东走滑断裂分段位移量
Table 1. Subsection displacement of Liaodong strike-slip fault
地质层位 北段 中段 南段 位移量/km 速率/（km·Ma−1） 位移量/km 速率/（km·Ma−1） 位移量/km 速率/（km·Ma−1） 明化镇组时期—今 0.5 0.09 0.3 0.06 0.5 0.09 馆陶组时期 4 0.22 1.2 0.07 4 0.22 东营组时期 4.7 0.57 1.6 0.2 6.5 0.79 
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