CHARACTERISTICS AND GENETIC MECHANISM OF “BROOM-LIKE SYN-DEPOSITIONAL FAULTS” IN WEST SEGMENT OF CENTRAL UPLIFT BELT IN DONGYING DEPRESSION
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摘要: 通过对东营凹陷中央隆起带西段帚状生长断层系中"帚状分散系"和"主干断层"生长指数的计算,分析了研究区"帚状生长断层"中不同组系断层的发育特征,认为帚状生长断层中"主干断层"和"帚状分散系"具有"非等时性"特点,"帚状分散系"在中始新统沙河街组三段沉积期生长指数最大,"主干断层"在上始新统沙河街组二段沉积期生长指数最大。研究区"帚状生长断层"系内不发育断角砂体,沉积中心不稳定,中始新世沙河街三段沉积期沉积中心位于"帚状分散系"的上盘,晚始新世沙河街二段沉积期则迁移至"主干断层"的上盘。这些特征表证明其并非真正帚状生长断层,本文称之为"似帚状生长断层"。论文讨论了"似帚状生长断层"活动对沉积的控制作用,并结合区域构造特征探讨了"似帚状生长断层"的形成机制。根据前述"似帚状生长断层"对沉积的控制作用,结合区域构造特征,论文注重探讨了"似帚状生长断层"的形成机制。中始新世Es3中+Es3下亚段沉积期以近SN向张应力为主,形成近EW向生长断层,至晚始新世Es3上亚段+Es2段沉积期以NW向张应力为主,形成NE向生长断层。中始新世近EW向生长断层发育,晚始新世NE向生长断层发育且走滑构造活动作用加强,使得不同时期的生长断层在空间上组合形成"似帚状生长断层"。"似帚状生长断层"对沉积的控制作用明显不同于真正意义上的帚状生长断层,这一点在对高勘探程度渤海湾盆地的研究过程中应引起充分的重视。Abstract: The development characteristic of the "broom like faults" in the west segment of the central uplift zone in the Dongying Depression was discussed in this paper by calculating the growth coefficient of the faults. Our results show that the main faults and the subsidiaries of the "Broom like faults" are not synchronous according to their growth index. The subsidiary faults have their highest growth index in the 3rd Member of the Shahejie Formation of mid Eocene, while the main faults have that in the 2st Member of Shahejie Formation of late Eocene. There found no sand bodies formed in the fracture angle between the main faults and the subsidiary faults. The depocenter is not stable but migrate from the hanging wall of the subsidiary faults during mid Eocene to the hanging wall of the main faults during late Eocene. These characters are different from those of the real "broom like faults". In the case of the real "broom-like faults", main faults are formed synchronously with the subsidiaries, and the depocenter is rather stable and located in the fracture angle between the main fault and the subsidiary fault. Therefore, we call this kind of faults the "quasi-broom like faults". The genetic mechanism of the "quasi-broom like faults" and the influence of the activity of "quasi-broom like faults" on sedimentary patterns are probed in this paper. It is concluded that the "quasi-broom like faults" were the result of the joint action of the independent extensional tectonic system and the SN strike and strike-slip system in NE direction.
The stage of Cenozoic faulting in the Jiyang Depression can be divided into two episodes according to the differences in tectonic stress fields. In the first episode during the early to mid Eocene, the Dongying Sag was under a N-S extensional tectonic stress field which caused the formation of E-W trending growth faults, while in the second episode during the late Eocene, the Dongying Sag was under the control of a NW-SE trending extensional tectonic stress field, which caused the formation of the NE-SW trending growth faults. The proper spatial combination of the E-W trending growth faults and the NE-SW trending growth faults due to the sinistral movement of the Tanlu Fault during the Eocene caused the "quasi-broom like faults" to take shape. The influences of the "quasi-broom like faults" on deposition pattern are far different from those of real broom like faults, so it is a must to pay much attention to the influence of "quasi-broom like faults" on sedimentation, in highly explorated basins, such as the Bohai Bay Basin. -
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