Depositional systems and genetic types of sand bodies of the Paleogene in Chengbei sag,Bohai Bay Basin
XU Peng1,2, LIAN Haojie3, BI Lige3, HU Hewei2, GAO Zhenghui3, JIANG Fujie1, SHAO Longyi3
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China; 3 College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China
Abstract：Chengbei sag is a half graben basin in the Bohai Bay Basin.Its exploration potential is limited by the understanding of the genetic type of sand bodies and the distribution of reservoirs.This paper has analyzed the sedimentary characteristics,sand body genetic types and reservoir distribution patterns of the Paleogene in the Chengbei sag,using the drilling cores,log curves,and 3D seismic reflection data. The Paleogene in this sag has been developed with fan delta,braided river delta,sub-lacustrine fan sedimentary facies.The fan delta is developed in the steep slope zone on the northeast side of the sag,with lithology dominated by massive gravelly coarse-grained sandstones.The seismic reflections show lenticular and wedge progradation and retrogradation morphologies and chaotic and the logging facies mainly show low-amplitude jag-shaped,jagged box-shaped,and bell-shaped.The braided river delta is developed in the gentle slope zone on the southwest side of the sag,with lithology mainly consisting of cross-bedded sandstones.The seismic reflection shows S-shaped progradation and imbricated progradation patterns. The logging facies mainly show box-shaped,bell-shaped and funnel-shaped patterns. The sub-lacustrine fan is controlled by gravity flow and developed in the deep lacustrine area of the sag center.The seismic reflection is featured by worm-like progradation. The lacustrine shoal-bars are developed at the edge or central uplift of lakes,controlled by wave action,and are characterized by sheet-like sandy deposits surrounded by mudstone.The seismic reflection is featured by lens-shaped reflection,and the logging facies mainly show finger-shaped and funnel-shaped.Vertically,the Member 3 of the Shahejie Formation is mainly composed of braided river delta,fan delta,and lacustrine sedimentary facies. The Members 1 and 2 of Shahejie Formation are mainly composed of braided river delta,fan delta and lacustrine sedimentary facies. The Member 3 of Dongying Formation is mainly composed of braided river delta and fan delta sedimentary facies,while the Member 2 of Dongying Formation is mainly composed of braided river delta sedimentary facies,with the scale of fan delta development being small. The generation and development of Paleogene sand bodies in the Chengbei sag are mainly influenced by tectonic activity,sediment supply,palaeo-microgeomorphologies,and lake level changes.The predominant genetic types of these sand bodies include fan delta sand bodies,braided river delta sand bodies,sub-lacustrine fan sand bodies,and lacustrine shoal-bar sand bodies.
XU Peng,LIAN Haojie,BI Lige et al. Depositional systems and genetic types of sand bodies of the Paleogene in Chengbei sag,Bohai Bay Basin[J]. JOPC, 2024, 26(4): 834-845.
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