东营凹陷现河地区沙三段震积岩特征及其意义

Discovery and Significance of Seismite of Silurian in Member Ⅲ at Shahejie Formation in Xianhe Area of Dongying Sag

在区域构造背景研究和岩芯观察的基础上,在东营凹陷现河地区沙三段地层中识别出震积岩。震积岩的主要标志是发育各种类型的软沉积变形构造,包括微阶梯状正断层、层内小褶皱、扭曲变形、振动液化砂岩脉、震塌岩等。通过对河152井、王59井、牛38井、牛22井等井岩芯的系统观察,发现由于构造和地震强度的不同,震积岩的垂向序列有所不同,并进一步研究了各种震积岩构造特征与地震强度的关系,研究表明不同的震积岩构造特征对应不同的地震强度,进一步确定了与古地震的关系。通过对本区储层分析,认为震积岩可以作为一种有效的储集空间。这些研究为东营凹陷构造演化研究、震积岩的识别和描述以及成藏提供了重要的地质理论依据,并可为该区古地震研究提供依据。

Based on studies of regional tectonic setting and the observation of drilling cores, the seismite is recognized which mainly occurred in member m at Shahejie formation in Xianhe area of Dongying sag. Many kinds of soft sedimentary deformation structures have been found in seismite, such as step micro -faults, pleated within layers, liquefaction sandstone and clay veins, vibrational liquefaction deformation structure and seismic breccias. Observing the drilling cores in He 152, Wang 59, Niu 38, Niu 22, and so on, it is found that the sequence of seismite is different due to the different structure and seismic intensity. The relationship between seismite character and seismic intensity show that different seismite structure are formed by different seismic intensity, and testified the relationship between seismite structure and ancient earthquake. Research on reservoir show that seismite is an efficient reservoir. It provides the theoretical foundation for the tectonic evolution studies and seismite recognition in Tarim basin, and supplies evidence for researching palaeo-seismicity.