摘要:
任丘油田位于河北省任丘县、华北平原冀中坳陷的次级构造单元一饶阳凹陷内。由于其特殊的应力条件和地质条件,使其成为地质和力学结构上的簿弱点。油田的开发和高压注水,使其有效应力值进一步降低,发生了诱发性小震群活动,最大震级Ms=3.3。在华北地区发生中强地震前,该区小震群活动有明显增强现象,这种特点与华北地区5~7级大震前出现小震群活动的特点相一致。该区是华北块体大范围的统一应力场作用下,反应地壳应力变化的敏感点,可以作为监测华北地区震情变化的一个"窗口"。
Abstract:
Remiiu oil field is located in Renqia county of Hsbei Province and the Raoyiang seg, the subtectOnic element of central Hebei dpression in North China plain.Because of its special stress and geologic condition, the region has becoras a weak posttio.i in geological aad mechanical structure.With the exploitation and the water injection at high pressure in the oil field, the effective stress further decreases to induce the small swarms, of which the maximum magnitude is Ms=3.3.#br#Before moderately strong earthquakes in North China, the small swarni activity has show an obvious raising trend.Such feature coincides vith the occurrence of small swarms before great earthquakes with magnitude 5-7 in North China.The region is a sensitive point of reflecting cfustal stress change under the action of general stress field in the la,ge range of North China block.So it can be considered as a "window" for monitoring the change of seismicity in North China.
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