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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。
Due to the strong uplift and erosion in the early Hercynian of the Linshui-Yubei area in the eastern Sichuan Basin, only the incomplete Upper Carboniferous Huanglong Formation remains, which is the main producing zone of natural gas reservoirs in eastern Sichuan and also the neighboring area. One of the most favorable layers of gas source. Based on the core observation and identification of rock fragments under the microscope in the laboratory, and combining with the study of sedimentary facies markers such as petrology, palaeontology and logging, it is determined that the sedimentary systems such as the Sobha, the Gulf shelf and the coast of the Huanglong Formation in this area are further divided Several subphases and microfacies. Using the classic sequence stratigraphy principle and its technical method represented by Vail, the Huanglong Formation is divided into a type Ⅰ tertiary sequence and subdivided into LST, TST and EHST system domains. Based on the study of the division of sedimentary facies and sequence stratigraphy, the stratigraphic-lithofacies palaeogeography map was made based on the systematic domain. Considering various factors of controlling sedimentary facies belt, combined with the reservoir characteristics of each facies belt and the actual oil and gas production data, the favorable reservoir facies belt in the study area is predicted and evaluated. It is considered that the facies of debris barrier beach is the most Favorable reservoir phase belt.