临南地区扭张构造形成机制及其控藏作用

针对以往对临南地区扭张构造的发育演化机制、扭张构造对油气成藏要素的控制作用认识不清等问题,综合运用地质、地球物理、数值模拟等方法,定性分析和定量评价相结合,对研究区扭张构造形成机制及其控藏作用进行研究.结果 表明,临南地区始于伸展性动力学背景下的斜向拉伸运动,由于复活的基底断层走向斜交于区域拉伸方向,从而形成了典型的扭...

Formation and evolution of transtensional structure and its hydrocarbon accumulation control in Linnan area

The formation mechanism and hydrocarbon accumulation control of the transtensional structure in the study area are studied comprehensively with geologic and geophysical and numerical simulation methods with qualitative analysis and quantitative evaluation to improve the understanding of the development and evolution mechanism of the transtensional structure and its effect on the controlling factors of hydrocarbon accumulation in Linnan area.Results demonstrate that the Linnan area first stretches obliquely due to extensional force,and then a typical transtensional structure is formed because the reactivated basement fault strike is oblique to the extension direction of the area.Considering horizontal extension,verti?cal block faulting and lateral strike-slip movement,a quantitative characterization method of the transtensional structure are established.The average intensity of transtensional activity is about 0.4.The reservoir development is obviously con?trolled by the extensional structure.Three sand control modes of gentle slopes with stable subsidence,continuous migration and subsidence and slopes with synsedimentary faults affect the formation of different traps.The accumulation modes of dy?namic equilibrium in the transtensional fault zone,lateral migration in the slope zone and self-generation and self-storage in the sag zone are established according to the four structures of fault zones,namely ternary,binary,unitary and unstruc?tured modes.