巴西桑托斯盆地湖相微生物碳酸盐岩层序沉积特征及控制因素  

Sedimentary filling characteristics and controlling factors of lacustrine microbial carbonates sequence in the Santos Basin,Brazil

作　　者：何赛[1,2,3] 李国蓉 吴昌荣[1,2] 刘树根[2] 张忠民[4] 苏玉山[4] 朱奕璇[4] 何钊 任杰 王雨辰 周伟 王亚捷[1,2] HE Sai;LI Guorong;WU Changrong;LIU Shugen;ZHANG Zhongmin;SU Yushan;ZHU Yixuan;HE Zhao;REN Jie;WANG Yuchen;ZHOU Wei;WANG Yajie(College of Energy,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Sichuan Zhongcheng Institute of Coalfield Geophysical Engineering,Chengdu 610072,China;Sinopec Research Institute of Petroleum Exploration&Production,Beijing 100083,China)

机构地区：[1]成都理工大学能源学院,成都610059 [2]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [3]四川中成煤田物探工程院有限公司,成都610072 [4]中国石化石油勘探开发研究院,北京100083

出　　处：《石油勘探与开发》2022年第4期683-692,共10页Petroleum Exploration and Development

基　　金：国家科技重大专项“大坎波斯盆地盐下湖相碳酸盐岩储层控制因素及形成机理”(2016ZX05033-002-008)

摘　　要：基于地震、测井、岩心、铸体薄片、碳氧稳定同位素组成等资料,对巴西桑托斯盆地H油田下白垩统Barra Velha组层序沉积充填特征开展研究,建立高频层序地层格架,预测礁滩体的空间分布并探讨其控制因素。Barra Velha组沉积期,整体为孤立台地—斜坡的沉积格局,裂谷期—拗陷期的气候变化致使Barra Velha组下部三级层序SQ1(BVE300段)和上部三级层序SQ2(BVE100段—BVE200段)沉积表现出由深水低能到浅水高能的演化特征。裂谷期伸展断裂和走滑断裂活动以及拗陷期台缘—台内沉积分异作用使得这两个时期的沉积古地貌均展现出“三脊两洼”的形态特征。礁滩体主要发育于SQ2-LHST时期,湖平面周期性震荡约束礁滩体发育在台地相区SQ2-LHST各高频层序地层单元的顶部。走滑断裂活动通过改变沉积古地貌的方式控制礁滩体在平面上的展布。正花状走滑断裂导致浅水台地边缘及内部形成局部高地并成为沉积高能带,为礁滩体发育创造了条件。Based on comprehensive analysis of seismic,logging,core,thin section data,and stable isotopes composition of carbon and oxygen,the sedimentary filling characteristics of the Lower Cretaceous Barra Velha Formation sequence in H oil field,Santos Basin,are studied,and the high-frequency sequence stratigraphic framework is established,and the spatial distribution of reef-shoal bodies are predicted and the controlling factors are discussed.During the depositional period of the Barra Velha Formation,the study area is a slope-isolated platform-slope sedimentary pattern from southwest to northeast and the change of climate background from rift to depression periods has resulted in the variation of sedimentary characteristics from the lower third-order sequence SQ1(BVE 300 Member)of low-energy deep water to the upper third-order sequence SQ2(BVE 200 and 100 members)of high-energy shallow water in the Barra Velha Formation.The activities of extensional faults and strike-slip faults in rift period and the sedimentary differentiation from platform margin to intra-platform in depression period made the sedimentary paleogeomorphology in these two periods show features of“three ridges and two depressions”.The reef-shoal bodies mainly developed in the SQ2-LHST period,with vertical development positions restricted by the periodic oscillation of the lake level,and developed on the top of each high-frequency sequence stratigraphic unit in SQ2-LHST in the platform.The strike-slip fault activity controlled the distribution of the reef-shoal bodies on the plane by changing the sedimentary paleogeomorphology.The positive flower-shaped strike-slip faults made the formation of local highlands at the margins of and inside the shallow water platforms and which became high-energy sedimentary zones,creating conditions for the development of reef-shoal bodies.

关 键 词：巴西桑托斯盆地 下白垩统Barra Velha组 湖相微生物碳酸盐岩 高频层序 沉积特征 礁滩体 发育模式 

分 类 号：TE122.3[石油与天然气工程—油气勘探]