辽东湾北部潜山走滑转换带特征及其对规模性储层的控制

潜山走滑转换带在渤海海域发育较为广泛,但其发育特征及控储作用研究薄弱。利用钻井、测井、三维地震等各类资料,对辽东湾北部地区构造转换带发育特征、成因机制及其对潜山规模型储层控制作用进行分析。研究认为,燕山末期左旋走滑背景下,辽东湾北部潜山发育多种类型转换带;根据走滑断层的相互作用以及转换带的形态,可以将辽东湾北部潜山转换带分为单支弯曲型和双支叠覆型两种类型;根据局部应力状态可以进一步细分为单支反“S”型、单支“S”型、双支左旋右阶以及双支左旋左阶转换带4个亚类,其中单支反“S”型和双支左旋右阶型转换带属增压型转换带,单支“S”型和双支左旋左阶型转换带属释压型走滑转换带。增压型走滑转换带提供的压扭性动力破碎作用使得潜山发育大规模裂缝型储集层,是潜山规模型储层发育的关键。

Characteristics of strike-slip transfer zone and its control on large-scale reservoir of buried hill in Northern Liaodong Bay, Bohai Bay Basin

The buried hill strike-slip transfer zone is widely developed in the Bohai Sea, but its development characteristics and reservoir control are weak. Based on drilling, logging, 3D seismic and other data, the development characteristics, genetic mechanism of structural transfer zone and their control effect on buried hill scale reservoirs in northern Liaodong Bay are analyzed. Study shows that under the background of sinistral strike-slip at the late Yanshanian, many types of transfer zones are developed in buried hills in northern Liaodong Bay; based on the interaction of strike-slip faults and the shape of the transfer zone, the buried hill transfer zone in northern Liaodong Bay can be divided into two types: single-branch bending type and double-branch overlapping type; based on the local stress state, it can be further subdivided into 4 subclasses: single-branch anti "S" type, single-branch "S" type, double-branch left-handed right-order and double-branch left-handed left-order transfer zones. Among them, single branch anti "S" type and double branch left-handed right-order transfer zones belong to pressurized transfer zones, and single branch "S" type and double branch left-handed left-order transfer zones belong to pressure relief transfer zones; the compressive torsional dynamic crushing provided by the pressurized transfer zone makes the buried hill develop large-scale fractured reservoir, which is the key to the development of large-scale buried hill reservoir.