摘要
川东北龙岗东地区上二叠统长兴组地层划分以定性为主,生物礁滩体控制因素研究薄弱。基于层序地层学理论,利用最新地震及钻井资料,在龙岗东地区长兴组三级层序划分的基础上,采用INPEFA测井旋回分析技术,对长兴组高频层序进行识别与划分,并分析其对礁滩体的控制作用。结果表明:研究区长兴组自下而上划分为2个三级层序SQ1和SQ2,5个四级层序ssq1—ssq5;海平面高频升降影响生物礁滩体发育位置及规模,生物礁滩体主要发育于各高频层序格架内的高位体系域(HST);持续性的海退影响生物礁滩迁移方向,形成一定规模纵向叠置、横向迁移的礁滩体;生物礁滩的横向及纵向展布受控于海平面的升降变化,即受高频层序旋回的控制。研究成果为四川盆地龙岗东地区长兴组礁滩体油气勘探开发提供了有力依据。
Stratigraphic division of Upper Permian Changxing Formation in Eastern Longgang area of northeast Sichuan is mainly qualitative,and lack of research on control factors of reef beach.Based on theory of sequence stratigraphy,by using the latest seismic and drilling data,high-frequency sequence of Changxing Formation is identified and divided by applying INPEFA logging cycle analysis technology on the basis of 3th sequence division of Changxing Formation in Eastern Longgang area,and its control effect on reef beach body is analyzed.The results show that Changxing Formation in studied area is divided into 23rd sequences SQ1 and SQ2 and five 4th sequences ssq1-ssq5 from bottom to top.High-frequency sea level fluctuations affect development location and scale of reef beach bodies,which are mainly developed in highstand systems tract(HST)within each high-frequency sequence framework.Continuous regression affects migration direction of reef beach bodies,forming a certain scale of vertically superimposed and lateral migrated reef beach bodies.Lateral and vertical extension of reef beach bodies is controlled by sea level fluctuations,i.e.by high-frequency sequence cycle.The research provides basis for oil and gas exploration and development of reef beach bodies of Changxing Formation in Eastern Longgang area in Sichuan Basin.
作者
邓志强
胡明毅
左洺滔
张三
宋昊
DENG Zhiqiang;HU Mingyi;ZUO Mingtao;ZHANG San;SONG Hao(School of Geosciences,Yangtze University,Wuhan 430100,China;Research Institute of Petroleum Exploration and Development-Northwest,Lanzhou 730030,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2023年第1期11-22,共12页
Petroleum Geology & Oilfield Development in Daqing
基金
国家自然科学基金项目“川中地区埃迪卡拉系微生物白云岩成岩作用及储层孔隙定量演化——来自激光原位U-Pb同位素定年技术的约束”(42072171)
中国石油西南油气田公司勘探开发研究院科研项目“开江-梁平海槽礁滩气藏储层发育模式及流体分布规律研究”(JS2020-019)。
