Structural characterization of the Phitsanulok basin, onshore Thailand, and regional tectonic implications
Structural characterization of the Phitsanulok basin, onshore Thailand, and regional tectonic implications
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泰国陆上彭世洛盆地的构造特征及区域构造意义
DOI：
10.1016/j.marpetgeo.2021.105110
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发表时间：
2021
影响因子：
4.2
通讯作者：
Wu, Jonny
中科院分区：
文献类型：
--
作者：
Amonpantang, Phinphorn;Wu, Jonny
彭世洛盆地是泰国最大的陆上裂谷盆地，30多年来一直是主要的碳氢化合物生产地。该盆地形成于中新生代，并在中新世早期从附近的活动构造（包括印度-亚洲碰撞）中重新活化。该盆地形成于泰国北部和南部之间的一个关键构造过渡区附近，位于16 ° N和18 ° N之间。以前的研究认识到，在整个彭世洛盆地的构造样式，可能表示更深的基底结构的南北变化。彭世洛北方盆地以伸展为主，而南部盆地则表现出不整合、褶皱和强烈反转的逆断层。在这里，我们系统地描述了彭世洛盆地内的结构域，从全盆地的2D和3D石油工业地震数据集，并检查我们的观察范围内的区域构造。我们的分析包括时间结构和等时图，空间故障模式，故障倾角，故障抛出，和故障方位角。我们发现最剧烈的构造变化发生在彭世洛盆地的北方和南方之间，横跨16 ° 50 ′ N纬度。在16 ° 50 ′ N以北，彭世洛盆地有近平面、陡倾角的正断层;低位移、横切合成和反向伸展断层阵列;以及加厚且相对未变形的素可泰凹陷，其在上新世至早中新世地层之间的双向时间（TWT）厚度高达1700 ms（~2.3 km）。相反，在16 ° 50 ′ N以南，盆地有铲形伸展断层;地层剖面突然变薄（上新世至早中新世地层之间的TWT约为400 ms;约0.4 km），断层倾角更缓，断层落差更大。我们解释的16 ° 50 ′ N构造转换发生在大地震的南部边界附近，区域断层趋势的变化，以及ENE-WSW磁性线性构造，并可能突出深部基底组构。
The Phitsanulok basin is the largest onshore rift basin in Thailand and has been a major hydrocarbon producer for over 30 years. The basin formed in the mid-Cenozoic and was episodically reactivated after the early Miocene from nearby active tectonics, including the India-Asia collision. The basin is formed near a key tectonic transition between north and south Thailand between 16°N and 18°N. Previous studies recognized a north-south variation in structural styles across the Phitsanulok basin that may express deeper basement structures. The northern Phitsanulok basin is predominantly extensional whereas the southern basin shows unconformities, folding, and reverse faults from stronger inversion. Here we systematically characterize structural domains within the Phitsanulok basin from a basin-wide 2D and 3D petroleum industry seismic dataset and examine our observations within the context of regional tectonics. Our analysis includes time structure and isochron maps, spatial fault patterns, fault dip angles, fault throws, and fault azimuths. We find the most dramatic structural changes occur between the northern and southern Phitsanulok basin across 16°50′N latitudes. North of 16°50′N, the Phitsanulok basin has near-planar, steeply-dipping normal faults; arrays of low displacement, cross-cutting synthetic and antithetic extensional faults; and, a thickened and relatively undeformed Sukhothai depression that had up to 1700 ms two-way time (TWT) thickness (~2.3 km) between the Pliocene to Upper Early Miocene strata. In contrast, south of 16°50′N the basin has listric extensional faults; an abruptly thinner stratigraphic section (~400 ms TWT between the Pliocene to Upper Early Miocene strata; ~0.4 km), more gently-dipping faults, and larger fault throws. Our interpreted 16°50′N structural transition occurs near the southern limit of major earthquakes, changes in regional fault trends, and ENE-WSW magnetic lineaments and may highlight deep basement fabrics.
泰国裂谷盆地五个异常构造特征及其对含油气系统的影响
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
C. Morley
通讯作者：
C. Morley