摘要
根据四川盆地达州下侏罗统野外露头剖面的精细观察与描述,对凉高山组的沉积特征和岩相组合规律进行了研究,总结沉积演化规律,进而探讨沉积特征对油气的控制作用,研究表明,四川盆地达州凉高山组共识别出了2种沉积相,9种沉积微相。其中,湖泊相和三角洲相是达州凉高山组最主要沉积相类型,湖泊相进一步可以分滨浅湖亚相和半深湖亚相,三角洲相发育三角洲前缘亚相,进一步可以分为水下分流河道、河口坝、席状砂、远砂砂坝以及支流间湾等微相。凉高山组垂向以三角洲前缘-滨湖-浅湖-半深湖沉积组合为主,共经历了三次湖侵的沉积演化规率。厚层砂岩段为良好的储集层,半深湖黑色页岩为烃源岩。良好的生储组合为研究区油气藏的形成提供良好的地质条件,达州地区凉一段砂岩段、页岩段以及凉二段砂岩段为最佳勘探开发层位。
According to the detailed observation and description of the f ield outcrop prof ile of the Lower Jurassic in Dazhou,Sichuan Basin,the sedimentary characteristics and lithofacies association rules of Lianggaoshan Formation are studied,the sedimentary evolution rules are summarized,and then the control of sedimentary characteristics on oil and gas is discussed.The research shows that there are two kinds of sedimentary facies and nine kinds of sedimentary microfacies in the Dazhou Lianggaoshan Formation,Sichuan Basin.Among them,lacustrine facies and delta facies are the main sedimentary facies types of the Dazhou Lianggaoshan Formation.The lacustrine facies can be further divided into shore shallow lake subfacies and semi deep lake subfacies.Only delta front subfacies are developed,and can be further divided into underwater distributary channels,mouth bars,sheet sand,distal sand bars,and tributary bays microfacies.The Lianggaoshan Formation is mainly composed of delta front,lakeside,shallow lake and semi deep lake sedimentary assemblages,and has experienced three lake transgressions.The thick sandstone section is a good reservoir,and the semi deep lake black shale is a source rock.Good source reservoir combination provides good geological conditions for the formation of oil and gas reservoirs in the study area.Sandstone section,shale section and sandstone section of Liangyi Member in Dazhou area are the best exploration and development horizons.
作者
徐鑫寿
吴湘
庞文强
钱子桐
XU Xin-shou;WU Xiang;PANG Wen-qiang;QIAN Zi-tong(Yangtze University,School of Geosciences,Wuhan 430100,China)
出处
《化工管理》
2023年第13期73-75,共3页
Chemical Engineering Management
基金
长江大学大学生创新创业训练计划项目“川东达州剖面侏罗系凉高山段沉积演化及其对古环境响应”(Dk2021022)。
关键词
四川盆地
下侏罗统
凉高山组
沉积相
沉积演化
Sichuan Basin
Lower Jurassic
Lianggaoshan Formation
sedimentary facies
sedimentary evolution
