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Seismism and fluxoturbidite in Front of Delta

Journal of China University of Mining and Technology 2005年第1期15卷 26-31页

作者： YANJi-hua CHENShi-yue JIANGZai-xing SONGGuo-qi QIUGui-qiang FacultyofGeo-ResourcesandInformation UniversityofPetroleumDongyingShandong257061China GeologicalScientificResearchInstitute ShengliPetroleumAdministrationDongyingShandong257015China

Seism is one of the main triggering mechanisms of forming fluxoturbidite in front of delta. The forming process of fluxoturbidite in front of delta under seismism was experimentally simulated in lab. The results show that there are two kinds of slumping and three kinds of fluxoturbidites in front of delta under seismism. The liquefied fluxo- turbidite and secondary overlapped turbidite move by their own gravity, and develop mainly on the base of foreslope and the frontal bed slope. They have a small sedimentary scale and can’t move too far. On the contrary, the faulted fluxoturbidites have a larger scale and can move a long distance. The collision- power from hinder overlapped sand body is also the motivity of the faulted fluxoturbidite’s migration besides its own gravity. They mostly develop in the deep sag in front of delta, and are the favorable room to accumulate petroleum. Finally, according to the demonstration and inversion of similarity, at least 7.35 M of earthquake had happened in middle- Shasan period of Paleogene, which induced the slumping of delta front. So the tectonic action of northern steep slope is the main reason to induce earth- quake.

关键词： seism delta fluxoturbidite flume experiment inversion

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