The distribution and characteristics of the igneous complexes in the northern East China Sea Shelf Basin and their implications for hydrocarbon potential
The distribution and characteristics of the igneous complexes in the northern East China Sea Shelf Basin and their implications for hydrocarbon potential
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DOI：
10.1007/s11001-010-9112-y
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发表时间：
2010-12
期刊：
影响因子：
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通讯作者：
D. Cukur;S. Horozal;Dae-Choul Kim;G. Lee;Hyun-chul Han;Moo-Hee Kang
中科院分区：
文献类型：
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作者：
D. Cukur;S. Horozal;Dae-Choul Kim;G. Lee;Hyun-chul Han;Moo-Hee Kang
本文介绍了北方东海陆架盆地二维地震填图的结果。通过地球物理勘探确定了各种火成岩特征，如岩床、火山机构和岩株。窗台是最常见的，在90多个地点观察到。大多数映射的底床在研究领域的特点是高振幅的连续反射与不同的终端。局部观察到碟形和杯形窗台。这些岩株是不协调的（几乎垂直的）火成岩体，其特征是地震透明度，具有上翻的主岩和隆起的覆盖层。火山机构和/或颈部由不规则的丘和峰组成，其特征是强烈的正顶部反射，内部相混乱。东海陆架盆地北方最古老的岩浆活动是早白垩世（123.3 ± 3.7）。这种岩浆活动与中国东部的岩浆活动相吻合，而中国东部的岩浆活动主要与太平洋板块向欧亚板块俯冲有关。根据褶皱地层、年龄测定和火成岩岩床的出现，中新世火成岩活动受到很好的限制。这一侵入的时间是一致的强烈的岩浆活动，如以前建议的中国东部。火成岩可以形成油气圈闭、储集层，并具有封闭作用，在油气研究中占有重要地位。
This paper presents results of two-dimensional seismic mapping of the northern East China Sea Shelf Basin. Various igneous features such as sills, volcanic edifices and stocks were identified by the geophysical exploration. The sills are most common, and are observed at more than 90 locations. Most mapped sills in the study area are characterized by high-amplitude continuous reflections with distinct terminations. Saucer- and cup-shaped sills are observed locally. The stocks are discordant (nearly vertical) igneous bodies and they are characterized by seismic transparency, with upturned host rocks and uplifted overburden. The volcanic edifices and/or necks consist of irregular mounds and peaks and are characterized by strong positive top reflections with chaotic internal facies. The oldest igneous activity in the northern East China Sea Shelf Basin is Early Cretaceous (123.3 ± 3.7). This igneous activity coincides with those observed in eastern China which has been related mainly to the subduction of the Pacific Plate beneath Eurasia Plate. The Miocene igneous activity is well constrained based on seismic stratigraphic relationships within the folded stratigraphy, age dating, and the occurrence of igneous sills. The timing of this intrusion is coincident with the intensive igneous activity as previously suggested for the eastern China. Igneous rocks can produce hydrocarbon traps, reservoirs and they can act as a seal, and therefore are of great importance in petroleum study.