下扬子区泥盆系—三叠系碳酸盐岩和碎屑岩层序类型及其石油地质意义  

Sequential types of Devonian-Triassic carbonate rocks and clastic rocks and the significace to petroleum geology in lower Yangtze river region

作　　者：萧惠中 杨册 王一博 吴锐锋 XIAO Huizhong;YANG Ce;WANG Yibo;WU Ruifeng(Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 511458,Guangdong province,China)

机构地区：[1]中国地质调查局广州海洋地质调查局,广州511458

出　　处：《地质找矿论丛》2025年第1期73-82,共10页Contributions to Geology and Mineral Resources Research

基　　金：广州市基础研究计划基础与应用基础研究项目(编号:2023A04J0243)资助。

摘　　要：以下扬子区泥盆系—三叠系地层为目标层,以野外剖面和钻井为依据,综合研究各地层岩性、岩性组合和沉积相等特征,对泥盆系—三叠系碳酸盐岩和碎屑岩层序开展研究,并探讨其石油地质意义。研究认为,下扬子区泥盆系—三叠系可以划分为上泥盆统(SS1)、下石炭统—上石炭统(SS2)、中二叠统—上二叠统(SS3)和下三叠统—中三叠统(SS4)等4个二级层序,以及观山段(S1)、擂鼓台段(S2)、金陵组(S3)等18个三级层序。其中,11个三级层序均由低水位体系域(LST)、海侵体系域(TST)和高水位体系域(HST)等完整的体系域构成,5个三级层序由TST和HST构成,1个三级层序由LST和TST构成的,1个三级层序仅由TST构成。研究区的层序类型可划分为碳酸盐深水Ⅱ型、碳酸盐浅水Ⅰ型和浅水Ⅱ型、碎屑岩深水Ⅰ型和Ⅱ型、碎屑岩浅水Ⅰ型和Ⅱ型等7种类型。下扬子区泥盆系—三叠系发育栖霞组、孤峰组、龙潭组、大隆组、下青龙组和上青龙组等多套烃源岩层,船山组、栖霞组、下青龙组、观山段、擂鼓台段、龙潭组等6套储集层,孤峰组、龙潭组、上青龙组、周冲村组等4套盖层,纵向上形成良好的生储盖组合。Lithology,lithological combination and sedimentary facies of each stratum are comprehensively studied to deal with sequence of Lower Devonian-Triassic carbonate rocks and clastic rocks and significance to petrolium geology in lower Yangtze river region.Devonian-Triassic System here is divided into Upper Devonian Series(SS1),Lower Carboniferous Series-Upper Carboniferous Series(SS2),Middle Permian Series-Upper Permian Series(SS3)and Lower Triassic Series-Middle Triassic Series(SS4),the four second order sequences;Guanshan Member(S1),Leigutai Member(S2),Jinling formation(S3)etc.the 18 third order sequences of which 11 sequences are all complete system tracks i.e.lowland-system track(LST)-transgressive system track(TST)-Highland system track(HST),5 sequences TST and HST,1 sequense LST and TST,1 TST.Furthermore the sequence here can be divided into deep water carbonate rock typeⅡ,shallow water carbonate rock typeⅠandⅡ,deep water clastic rock typeⅠandⅡ,shallow water clastic rock typeⅠandⅡ.In the study area are developed Devonian-Triassic Qixia,Gufeng,Longtan,Dalong,Xiaqinglong and Shangqinglong formations of hydrocarbon source rock and Chuanshan,Qixia Xiaqinglong formation and Guanshan,Leigutai members and Longtan formation of reservior strata and Gufeng,Longtan,Shangqinglong,Zhouchongcun formations of cap strata,a vertical source-reservior-cap rock assemblage.

关 键 词：下扬子区 泥盆系—三叠系 碳酸盐岩层序 碎屑岩层序 

分 类 号：P618.13[天文地球—矿床学] P588.245[天文地球—地质学]