Prediction And Evaluation Of The Source Rocks Of The Third Member Of The Oligocene Dongying Formation In The Bozhong Sag, Bohai Bay Basin

In this study,the hydrocarbon source rocks in the third member of dongying formation in bozhong sag were evaluated,and the prediction of high-quality hydrocarbon source rocks in the third member of dongying formation and other key issues were studied in depth.The identification index system of high-quality hydrocarbon source rocks in the third member of dongying formation was established,and the hydrocarbon source strata in the third member of dongying formation were predicted and evaluated.Will bozhong sag east three period of hydrocarbon source rocks were analyzed,and the source of organic matter abundance,organic matter type,parent material,the respect such as maternal environment to hydrocarbon source rocks has carried on the comprehensive evaluation.Use of organic carbon content,rock pyrolysis,microscopic examination of the kerogen of dongying group three period of hydrocarbon source rocks,the evaluation of organic matter abundance and type of the kerogen type is mainly ? type;by using the calculation of hydrocarbon generation dynamics method and previous studies on source rocks in bozhong sag,it is established that the lower limit of high-quality source rocks is 2% TOC and 10mg/g S1+S2;from the paleontology analysis,dongying group three sections of hydrocarbon source rocks in shore-shallow lake deposits sedimentary environment is mainly develop Prominangularia as well as Cleistosphaeridium channel;under the shore-shallow lake deposits environment,there are mainly Leiosphaeridia,Granodiscus and Filisphaeridium.The whole rock X diffraction was used to divide the rock facies of the source rock,and it was found that the source rock was mainly mixed fine-grained rock facies.The log data were analyzed to find the characteristics of GR,RD,RS and AC logging curves;Optimizing the root-mean-square amplitude,conveniently frequency seismic attributes such as effective bandwidth and established the three sections of high-quality hydrocarbon source rocks in dongying group sedimentary environment of the development of major established a set of comprehensive identification system of dongying group three sections of high-quality hydrocarbon source rocks as well as the standard,the use of seismic inversion technology,the combination of through the WX-3,WX,WX-4-5 Wells,predict the east of bozhong sag dongying group three sections of the distribution of high quality hydrocarbon source rocks,indicating the oil and gas exploration prospect areas,provide guidance for practical production and theoretical study.