走滑应变椭圆模型的改进及应用举例

doi:10.11867/j.issn.1001-8166.2019.08.0868

剪切带带内某些次级应变与现有走滑应变椭圆的7类应变要素（PDZ，R，R′，P，T，Y破裂及局部挤压变形）难以准确对应。为解决这一问题，以右行走滑为例，通过理论推导与试验模拟，深入研究次级应变表现出的应变性质，并据此提出包含所有应变性质组合（8类）的完全分类模型。该模型包括4个单纯性质的应变带（纯右行走滑、纯左行走滑、纯挤压和纯伸展应变带）和4个复合性质的应变区（伸展兼右行走滑、伸展兼左行走滑、挤压兼左行走滑和挤压兼右行走滑应变区）。复合性质应变区中，越靠近单纯性质方向的应变，产生相应性质的动力就越强。该模型在理论上论证了传统走滑模型的合理性并弥补其空缺部分。同时，举3个渤海的研究实例说明该模型改进后的应用： $①$ 莱州湾凹陷东北洼挤压与伸展作用共控成圈，说明走滑带内的挤压与伸展应力场同步持续、相互垂直的时空关系，以及二者的统一而非矛盾的辩证关系； $②$ 渤海走滑转换带的研究成果，说明走滑带内伸展或挤压型转换带的应变走向规律； $③$ 渤海某潜山油田的有效裂缝研究成果，说明有效裂缝的走向与现今走滑应力场中的伸展应变区对应的关系。

关键词: 走滑应变椭圆, 理论推导, 试验模拟, 应变要素, 完全分类

For some strain in the strike slip zone is difficult to be determined accurately in the classification scheme of the 7 elements of the ellipse of the strike slip strain ellipse (PDZ, R, R', P, T, Y and local contraction), the properties of the strain elements in all directions in the strained ellipse were reunderstood by analyzing the causal relationship between the mechanical state and the strain properties in a certain direction. A new model of the Riedel shear system was proposed, which contained 4 pure strain zones (pure right walk slip, pure left walking slip, pure extrusion, pure Stretch Strain Zone) and 4 complex strain zones (both stretching and right walking, both stretching and left walking, both extrusion and left walking, both extrusion and right walking slip strain zone). The closer the crack was to the direction of a single strain band, the stronger the corresponding property. The model included all the elements of the traditional model and made up for its vacancy. It proved the rationality of the left (right) row left (right) order and the double tectonic belt rule. At the same time, three research examples of Bohai Sea were cited to illustrate the application of the model: (1) The synchronous and perpendicular spatial-temporal relationship between compressive and extensional stress fields in strike-slip zones, as well as the unified but not contradictory dialectical relationship between them, were illustrated through the example of the co-controlled cycle formation of northeastern depression in Laizhou Bay Depression; (2) The Bohai Sea walk was enumerated. The research results of the slip transition zone illustrated the strain trend law of the extensional or compressive transition zone in the strike-slip zone; (3) The relationship between the strike of the effective fracture and the extensional strain zone in the present strike-slip stress field was illustrated by giving an example of the effective fracture research results of a buried hill structure in the Bohai Sea.

Key words: Strike slip strain ellipse model, Theoretical derivation, Experimental simulation, Strain factor, Complete classification.

中图分类号:

P542

图1 右行力偶产生的走滑应变椭圆^{[

5
]}

Fig.1 The strike slip strain ellipse produced by the right line of force pairs ^{[

5
]}

图2 完全分类的走滑应变椭圆模型

Fig.2 A complete classification model for Riedel shear system

图3 右行力偶产生的合力圆

Fig.3 The resultant force circle produced by the right line couple

图4 应力及方向对应走滑性质的完全分类示意图

Fig.4 Schematic diagram of complete classification of stress and direction corresponding to strike slip property

图5 走滑应力椭圆的剪切性质分区示意图

Fig.5 Zoning of strike slip properties of a sliding stress ellipse

图 6 走滑断层转弯段的挤压与伸展性质示意图

Fig.6 Pattern of extrusion and extensional properties of strike slip fault turning section

图7 右行走滑不同角度派生破裂张、压性质示意图

Fig.7 Schematic diagram of fracture tension and pressure properties derived from different angles of right strike-slip

图8 走滑应力椭圆的断层压、张性质分区示意图

Fig.8 Zoning of the fault pressure and the tensile properties of the strike slip stress ellipse

图9 右行剪切时不同角度雁列破裂应变性质模拟结果图

Fig. 9 Simulation results of fracture strain properties of echelons with different angles under right shear

图10 右行剪切时雁列破裂应变性质随角度连续变化模拟结果图

Fig.10 Simulated experimental results of continuous variation of fracture strain properties with angle in strike-slip zone

图 11 “S”型走滑增压段的物理模拟结果 $①$

Fig.11 Physical simulation results of the "S" type strike slip supercharging section $①$

图 11 “S”型走滑增压段的物理模拟结果 $①$

Fig.11 Physical simulation results of the "S" type strike slip supercharging section $①$

图12 辽西二号断裂围区沙一段顶面构造刚要图

Fig.12 Rigid top structural map of Sha 1 member in the Surrounding area of Liaoxi No.2 Fault

图13 莱州湾凹陷东北洼构造纲要图

Fig.13 Outline of northeast sag structure in Laizhou Bay sag

图14 走滑、伸展与挤压应变方位统计及在走滑应变椭圆中的投影图

Fig.14 Azimuth statistics of strike slip, extension and extrusion strain and projection map in strike slip strain ellipse

图15 横穿走滑释压及增压带地震剖面图（剖面位置见图13）

Fig.15 Seismic profile of transverse strike-slip pressure release and booster zone(The section position is shown in Fig.13)

图16 渤海主要走滑转换带的应变性质示意图（据参考文献[ 22 ]修改）

Fig.16 Strain properties of the main strike-slip transition zones in the Bohai Sea(modified after reference[ 22 ])

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摘要

Improvement and Application of Riedel Shear Systerm