沉积学报2018，Vol.36Issue(1)：154-165,12.DOI:10.3969/j.issn.1000-0550.2018.017
乌石凹陷南部陡坡带流二段大型储集体发育条件及特征
Large Reservoirs Development Condition and Characteristics of the Second Member of Liushagang Formation in the Southern Steep Slope Zone, Wushi Depression
摘要
Abstract
Comprehensive analysis of drilling, palaeontology, seismic, sections and other data, the large reservoirs development conditions,types,characteristics and the favorable exploration directions of the southern steep slope zone in Wushi depression was analyze. It proposed that the lake level, provenance, fracture and paleogeomorphology cou-pling controlled the development of large reservoirs in the steep slope of fault-depressed lacustrine basin.Among them, the strong lake retreat was the basic condition of the Palaeo-lake evolution for developing large reservoirs,the enough supply of provenance was the material guarantee for forming large reservoirs,the significant fracture accumulated sand effect and suitable topography were the important catchment mechanism for constructing large reservoirs.The main types of large reservoirs were fan delta and braided river delta.The fan delta was mainly controlled by the fracture sur-face gentle slope zone and valley topography, the lithology was relatively coarse, the sedimentary microfacies were mainly underwater distributary channel and subaqueous inter-distributary bay.The braided river delta was mainly con-trolled by transition fault zone, broom fault zone as well as relatively wide and gentle topography, the lithology was relative fine,the sedimentary microfacies were mainly distributary mouth bar and distal bar, besides underwater dis-tributary channel and subaqueous inter-distributary bay.On this basis and combined with the characteristics of large reservoirs,it suggested that the favorable exploration layer for the eastern part of the southern steep slope zone was the highstand system tracts of lower sequence and for the western part of the southern steep slope zone was the lowstand and transgression systems tracts of upper sequence in the second member of Liushagang,Wushi depression.Due to the front of the large reservoirs lithologic traps,lithological-structural traps and structural traps were developed,and were shallow buried,closed to the hydrocarbon supply center,at the same time located in the dominant direction of oil and gas accumulation,therefore,was the favorable exploration area.关键词
陡坡带/乌石凹陷/储集体/流沙港组/断裂聚砂Key words
steep slope zone/Wushi depression/reservoir/Liushagang Formation/fracture accumulated sand分类
天文与地球科学引用本文复制引用
罗威,张道军,刘新宇,胡雯燕,史德锋,吴仕玖..乌石凹陷南部陡坡带流二段大型储集体发育条件及特征[J].沉积学报,2018,36(1):154-165,12.基金项目
国家科技重大专项(2016ZX05024-002-009)[National Science and Technology Major Project,No.2016ZX05024-002-009] （2016ZX05024-002-009）
