The Restudy Of Well LF35-1-1 And The Analysis Of Mesozoic Oil And Gas Prospect In Chaoshan Depression

Chaoshan area of Pearl River Mouth Basin in Mesozoic strata thickness of large,there is early exploration and deployment of multi 2-D seismic lines and Jinghai 3D seismic zone,and the deployment of LF35-1-1 wells in the Chaoshan area in the north.Some achievements have been obtained in the seismic stratigraphic sequence,lithology,sedimentary and so on.The study is mainly based on the previous research results with LF35-1-1 wells of 2D and 3D seismic,aiming at the problem of LF35-1-1 wells are petrology,stratigraphy,in-depth analysis of the Paleozoic gas exploration potential wells volcano rock lithology,stratigraphic division,sedimentary facies and the Mesozoic oil.First,carry out the consistency of proofreading LF35-1-1 well lithology,thin section,logging interpretation,zircon dating of the second encryption in the health sector internal boundaries are further adjusted and confirmed;again,analysis of rock geochemistry in well LF35-1-1 volcano rock,and combined with the response analysis of rock thin section,logging,determination the volcano rocks,LF35-1-1 wells Jurassic Cretaceous volcano rock bottom is divided into 6 cycles,nearly 20 times.In the middle and lower Jurassic,the volcanic rocks are mainly sedimentary,and the later intrusive granite and granodiorite.The relative transgression in Late Jurassic(shallow sea)-regressive(delta-slope slope fan)-again(slope)of the transgressive deposition process.The lower Cretaceous is a relatively regressive(slope-littoral)deposition process.The upper Cretaceous sediments of the main fluvial facies of the flood plain channel channel deposition,the local floodplain lake deposition,for the arid evaporation lagoon environment.Finally,according to the two-dimensional wells line profile combined with seismic inversion,and Jinghai 3D virtual wells inversion,analyzes the characteristics of Mesozoic source rocks and reservoirs,show that the 3D seismic zone of Upper Jurassic and lower Cretaceous each have a thickness of about 150m and 75m thick pure mudstone,as hydrocarbon the rock has a certain scale,analyzes the exploration prospect of mesozoic.