胶莱盆地向南黄海延伸——来自南黄海地震剖面的新证据

JIAOLAI BASIN EXTENDING INTO SOUTH YELLOW SEA:EVIDENCE FROM A NEW SEISMIC PROFILE IN SOUTH YELLOW SEA

总结了前人对胶莱盆地形成机制、东部边界、地层发育及油气地质研究进展及存在问题。利用最新采集的二维地震剖面资料,对胶莱盆地海阳凹陷的盆地结构、地层发育及主控断裂进行了描述,估算了其海域分布面积,并探讨了其可能的形成机制。认为海阳凹陷是一个东断西超的箕状断陷,其主控断裂为东部边界断裂,可能是泗阳—连云港—千里岩—开城断裂的一部分,现今仍在活动。海阳凹陷西部陆上生油层系出露地表遭受破坏,但凹陷主体位于南黄海海域,有较好的生油层,生储盖组合配套好,且未遭受岩浆活动破坏,可能有较好的油气前景。

The Jiaolai Basin is a late Mesozoic fault basin located on the eastern side of Tanlu Fault Belt.It went through Laiyang,Qingshan and Wangshi stages in the late Cretaceous and can be subdivided into 11 sub-tectonic units.Based on a newly acquired seismic profile,this paper discussed the formation mechanism of the Haiyang Sag upon geometry characteristics,stratigraphic development and controlling faults.Our research indicates that the Haiyang Sag is a relatively independent sedimentary unit superimposed on the Sulu Orogenic Zone.It is an asymmetric fault basin,of which the east part is deeper and the west shallower.Its east boundary is a controlling fault probably as a part of the Siyang-Lianyungang Qianliyan-Kaicheng Fault.By comparing with the land part,we believe that the main part of the Haiyang Sag has extended into the South Yellow Sea where hydrocarbon source rocks are well developed and have never destroyed by igneous rocks.In this regard,it is considered that the Haiyang Sag has a better potential for petroleum exploration.