摘要
丽水 36 1构造位于东海陆架盆地 (台北坳陷 )丽水西次凹的中东部 ,该凹陷属新生代断陷型盆地 ,呈北东向展布 ,上古新统灵峰组和明月峰组是主要目的层段。根据该构造已钻的 3口井进行系统沉积学和测井相研究 ,上古新统物源主要来自凹陷西部的闽浙隆起带和中部的灵峰凸起带 ,可能还有北部的雁荡凸起带。不同的物源区通过断层的活动和海平面的升降等控制着沉积体系的发育和展布。在凹陷下陷兴盛和海平面快速上升期 ,灵峰凸起带物源经过边缘大断层在其西侧形成扇三角洲 ,进一步向凹陷中心推进形成深水浊积扇和浅海沉积 ;闽浙隆起带物源可能沿着不同的入口在凹陷西斜坡形成扇三角洲 ,它们也可进一步向凹陷深处推进形成深水浊积扇体。根据油气聚集规律和物源分析 ,形成于凹陷深水区的浊积扇沉积和斜坡带的扇三角洲前缘沉积 ,具有良好的生储盖组合 ,是有利的勘探目标。
Lishui 36-1 structure lies in the middle-eastern part of West Subsag of Lishui Sag, Taibei Depression , East China Sea Shelf Basin. The subsag is a Cenozoic faulted basin and elongated in north-east direction. The Upper Paleocene Lingfeng Formation and Mingyuefeng Formation are main oil-gas-bearing formations. On the basis of systematic sedimentology and well-logging facies studies of 3 wells in Lishui 36-1 Structure, clastic sediments in the Upper Palaeocene were mainly from the Minzhe Uplift Area to the west of Lishui Sag and Lingfeng Uplift Belt in middle Lishui Sag, and probably also from the Yandang Uplift Area in the north part of the sag. Different provenances controlled the development and distribution of depositional systems by synsedimentary faulting and sea-level changes. In the subsidence stages of the Lishui Sag and rapid sea-level rise, terrigenous clastics derived from the Lingfeng Uplift Belt were transported across the eastern boundary faults to the margin of the West Subsag to form fan delta deposits, and further into the center of the subsag to form deepwater turbidite fan deposits and neritic deposits. Meanwhile, clastics from the Minzhe Uplift Area were poured onto the western slope of the West Subsag from different inlets to form fan delta deposits which might be further delivered to deepwater area to form deepwater turbidite fan deposits. According to the theory of oil-gas accumulation and provenance analysis, deepwater turbidite fan deposits and fan delta front deposits can form favorable source-reservoir-cap rock associations for oil-gas and are the most prospective areas for exploration.
出处
《古地理学报》
CAS
CSCD
2003年第2期171-179,共9页
Journal of Palaeogeography：Chinese Edition
