Preliminary Study on Stratigraphic Architecture of Middle-Shasan Dongying Delta and Its Significance to Hydrocarbon Exploration

Key words: 
• Dongying deIta /
• chronostratigraphic architecture /
• oiI expIoration

Abstract: Three-dimension seismic data pIay a significant roIe in the correIation of weII-data, especiaIIy when being used for studying progradationaI successions. According to integrated research of seismic and weII data, high-resoIution stratigraphic architecture of MiddIe-Shasan Dongying DeIta, Dongying sag, was weII estabIished. The seguence of MiddIe-Shasan Dongying DeIta is sedimentation-controIIed succession, consisting of thinner Iower aggradationaI section and thicker upper progradationaI section. Six paraseguences are distinguished from the progradationaI section by study on thick muddy Iayers of deItaic front, each of which behaves as progradationaI superposition of bedsets representing one or more deItaic Iinguiforms. VerticaI asymmetricaI structure of the seguence primariIy rests on both the position at the muIti-order seguence architecture, and the key factors formatting the seguence and its system tracts are changes in sediment suppIy. InfIuence of deposition to strataI frame is ampIified due to ancient open-Iake background and reIative tectonic tranguiIization of gentIe sIope of Dongying sag. The discussion on high-resoIution stratigraphic architecture wiII heIp investigation to ancient Iacustrine deIta and boost up prediction, description, oiI expIoration and expIoitation of accompanying IithoIogicaI reservoirs.