摘要
四川盆地东部邻水—渝北地区由于受海西早期强烈构造隆升和侵蚀作用影响,仅残存不完整的上石炭统黄龙组,为川东地区天然气藏的主要产层,也是邻区寻找新气源最有利层位之一。根据岩心观察和室内镜下岩石薄片鉴定分析,并结合岩石学、古生物及测井等沉积相标志研究,确定该区黄龙组发育萨勃哈、海湾陆棚和滨岸等沉积体系,进一步划分出若干亚相和微相。应用Vail为代表的经典层序地层学原理及其技术方法将黄龙组划分为1个Ⅰ型三级层序,细分为LST、TST和EHST等体系域。在划分沉积相和层序地层研究的基础上,以体系域为单位进行了层序—岩相古地理编图。综合考虑控制沉积相带的各种因素,结合各个相带的储层特征和实际产油气资料,对研究区黄龙组进行了有利储集相带预测与评价,认为障壁粒屑滩微相为最有利储集相带。
In Linshui of Eastern Sichuan and Yubei of Northern Chongqing, only part of the Upper Carboniferous Huanglong Formation survived the intensive tectonic uplifting and erosion during the early Hercynian. It is the major pay zone of gas fields in the eastern Sichuan basin and also one of the most favorable targets for gas exploration in the adjacent areas. Based on core description and thin section analysis and in combination with lithology, palaeontology and log data, the Huanglong Formation is divided into three main sedimentary facies, namely sabkha, bay shelf and coast, which are further subdivided into various subfacies and microfacies. According to the principles and technologies of classic sequence stratigraphy represented by Vail, one sequence of type-Ⅰ and three system tracts including LST, TST and EHST are recognized in the Huanglong Formation. On the basis of a detailed analysis of sedimentary facies and sequence stratigraphy, the sequence-lithofacies paleogeography are mapped with the system tracts as mapping units. The favorable reservoir facies belts of the Huanglong Formation in the study area are predicted and evaluated based on a comprehensive analysis of all factors controlling sedimentary facies belts and in combination with the reservoir features of each facies belt and real oil and gas production data. It is believed that the barrier grain bank is the most favorable reservoir facies belt.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2009年第3期9-12,共4页
Natural Gas Industry
关键词
四川盆地
东
石炭系
沉积相
层序
岩相古地理
储集层
Sichuan basin, east, Carboniferous, sedimentary faices, sequence, lithofacies paleogeography, reservoir
