塔中隆起早古生代反转构造及其石油地质意义

Eopaleozoic inversion structures in the Tazhong Uplift and their significance to petroleum geology

宁飞 汤良杰 张钰 何春波 朱传玲 王鹏昊 陈群

Ning Fei Tang Liangjie Zhang Yu He Chunbo Zhu Chuanling Wang Penghao Chen Qun

根据典型的地震剖面解释结果,探讨了塔中隆起早古生代反转构造样式发育特征,分析了反转构造发育的石油地质意义。结果表明,震旦纪—早、中奥陶世的裂陷作用产生的基底正断层对后期构造变形样式产生了重要的控制作用。由于先存基底正断裂的影响,塔中隆起发育两种不同类型的反转构造组合样式。当先存正断层倾角较大时,断层方位不利于进一步反转,此时反转扩展到毗邻断层,先期正断层可能为后期的逆冲断层提供应力集中点,如塔中Ⅱ号断裂带和塔中10号断裂带;也可能被后期的压性构造褶曲,如塔中Ⅰ号断裂带。反转构造发育早期有利于烃类聚集,后期还可以发育不同幅度的反转型背斜,为油气聚集提供有利的圈闭。

By using typical seismic interpretation results,this paper focuses on a discussion of the development characteristics of the Eopaleozoic inversion structures in the Tazhong uplift and an analysis of their petroleum geological significance.The basement normal faults that were developed during the Sinian to the Early-Middle Ordovician controlled the later structural deformation styles,resulting in two inversion structural styles in the Tazhong uplift.The azimuth of the pre-exiting fault with larger dip angle might not be favorable for its further inversion and forced the inversion to the adjacent faults.The early faults might then serve as stress concentration point for later thrust faults,such as the Tazhong-Ⅱ fault belt and the Tazhong-10 fault belt.Or,they might be buckled by later compressional structures,such as the Tazhong-Ⅰfault belt.It is suggested that an inversion structure contributes in its early stage to hydrocarbon accumulation and forms in its later stage inverted anticlines with different amplitudes that are favorable traps for hydrocarbon accumulation.

10.11743/ogg20100110