Geological Interpretation and Hydrocarbon Exploration Potential of Three Types of Mound-shaped Reflectors in the Meishan Formation,Southern Qiongdongnan Basin  

作　　者：FENG Yangwei REN Yan LI Zengxue JIN Li 

机构地区：[1]School of Geographical Science and Tourism,Nanyang Normal University,Nanyang,Henan 473061,China [2]Shandong Key Laboratory of Depositional Mineralization&Sedimentary Mineral,Shandong University of Science and Technology,Qingdao,Shandong 266590,China [3]School of Earth Sciences,East China University of Technology,Nanchang 330013,China [4]PetroJindian(Beijing)Sci-Tech Co.,Ltd,Beijing 100000,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第1期167-176,共10页地质学报（英文版）

基　　金：funded by the National Natural Science Foundation of China(41872172,42072188);Jiangxi Provincial Natural Science Foundation(20202BABL211019);Open Fund Project of the Key Laboratory of Sedimentary Mineralization and Sedimentary Mineral Resources in Shandong Province(DMSM 2019008)。

摘　　要：Many mound-shaped reflectors with different features and shapes are evident in the Upper Member of the Meishan Formation from seismic profiles taken in the deep-water area of the Southern Qiongdongnan Basin.Based on the drilling,2 D and 3 D seismic data from the study area,descriptions of the seismic reflection characteristics as well as the geometric shape,wave impedance inversion,analogy and comparative analyses are carried out.Taken in conjunction with research on the paleo structure and paleo sedimentary background,we consider that the mound-shaped seismic reflectors are distributed in the Southern Slop belt and the Southern High-rise of the Qiongdongnan Basin,which can be subdivided into three types:reefs,contourite mounds and magmatic diapirs.The first type,reefs,includes patch reefs,platform marginal reefs and pinnacle reefs.Patch reefs present mound-shaped seismic facies with medium frequency and a moderately strong amplitude,being distributed at the uplift of the fault control platform on the Southern Slop belt.The platform marginal reefs have flat mound-shaped seismic facies with strong amplitude and medium frequency,developing at the margin of the carbonate platform in the Southern High-rise.The pinnacle reefs have mound-shaped seismic facies with strong amplitude and medium frequency and are developed on an isolated volcanic cone.The boundaries between individual reefs are clear on the seismic section,with reef ridge and reef ditch developed,the phenomenon of’front product’being visible within,two-way superelevation between wings is developed and they exist visibly as mounds in any viewed direction of the crosssection.They are slightly asymmetrical in the direction perpendicular to the paleodepth the reef body being steep near the deep-water side,while being gentle near the shallow water side.The wave impedance of a patch reef is about 7 kg/m^(3)×m/s,while the wave impedance of a platform marginal reef is about 7.5 kg/m^(3)×m/s.The second type-contourite moundsare mainly developed under the slop

关 键 词：deep-water area mound-shaped reflectors REEF contourite mound accumulation assemblage 

分 类 号：P618.13[天文地球—矿床学]