A Study On The Depth To Marine Paleozoic With Integrated Gravity Magnetic And Seismic Inversion In The South Yellow Sea Of China

The study of Paleozoic has important practical significance and theoretical significance on oiland gas exploration and geological structure cognition in the Southern Yellow Sea. Based on the "Southern Yellow Sea oil and gas resources survey " project and the relevant gravity magneticseismic plane and profile data of the South Yellow Sea, this article inversion and interpretation theSouth Yellow Sea marine Paleozoic depth combination of the flat of gravity and magneticanomalies and profile gravity magnetic seismic data, and provides a basis for the top interface ofmarine Paleozoic depth.This article Completed of the joint inversion of gravity and magnetic and seismic of the longprofile of the South Yellow Sea and inversion and interpretation of the depth of marine Paleozoicbased on the South Yellow Sea satellite altimetry gravity anomaly, uses the RGIS software of theChina Geological Survey Bureau to promote. Plane inversion principle is using the Bouguergravity anomaly stripping layer processing and then use the Parker inversion method to inverse thedepth value; The main principle of Profile inversion is Human-computer interaction inversion of2.5D prismatic model, to determine the main fault zone location and towards in the South YellowSea. In this paper, profile inversion results of the Paleozoic depth and plane inversion confirmeach other and adjust, and also do a lot of amendments and additions to the results of the seismicinterpretation. The result of this paper provides a more accurate quantitative inversion results andunderstanding for depth constructed in the South Yellow Sea especially understanding of the depthof change of the Paleozoic, and provide help for the Southern Yellow Sea Paleozoic tectonicevolution.Profile inversion results: Jurassic only in the northern part of South Yellow Sea andCretaceous, with little or no point sheet is very thin remnants;Jiang Shao fault zone overall tiltdirection is north of Western, the inclination is very steep in the east, and more moderate in thewest. The integrated results of plane and profile inversion show that: The depth of marinePaleozoic and the South Yellow Sea tectonic units are related. At the depression the Cenozoicsedimentary is thick,Paleozoic depth is shallow, with an average depth of about1km or so, themost shallow at close to0km; At the uplift area the Cenozoic sedimentary is thin, Paleozoic depthis deeper, with an average depth of about3-4km or so, the deepest of7km. The marine Paleozoicdepth map by gravity inversion to better reflect five tectonic units: the North Depression,Wunansha uplift, Central Uplift, Qianliyan uplift, the South Depression.