西南石油大学学报（自然科学版）
西南石油大學學報（自然科學版）
서남석유대학학보（자연과학판）
JOURNAL OF SOUTHWEST PETROLEUM UNIVERSITY(SEIENCE & TECHNOLOGY EDITION)
2014年
1期
51-57
,共7页
沟道体系%控制因素%砂体特征%黄流组%莺歌海盆地
溝道體繫%控製因素%砂體特徵%黃流組%鶯歌海盆地
구도체계%공제인소%사체특정%황류조%앵가해분지
channel system%controlling factor%sand bodies characteristic%Huangliu Formation%Yingge Sea Basin
莺歌海盆地晚中新统黄流组浅海厚层泥岩中发育的块状厚层粉细砂岩是近期天然气勘探热点，其储集砂体纵向多期叠置、横向变迁快。构造演化及古沉积背景控制了黄流组内三级层序格架的分布及演化，但未控制沉积体系或储集砂体的分布。该沉积体系与经典海底扇相比，没有明显的扇体亚相分异、主水道和天然堤等典型沉积特征，而为规模小、迁移快、堆积厚的沟道沉积砂体组合，将其定义为“非典型”重力流，用不同类型沟道+漫流体系来表征其特点。不稳定陆坡背景通过古地貌形态和物源供给样式来控制四级层序砂体分布规律，按沟道沉积水动力特征及堆积样式进一步划分为充蚀沟道、迁移沟道和充填构造，其中充蚀沟道和充填沟道储集条件好，是有利的勘探目标。
鶯歌海盆地晚中新統黃流組淺海厚層泥巖中髮育的塊狀厚層粉細砂巖是近期天然氣勘探熱點，其儲集砂體縱嚮多期疊置、橫嚮變遷快。構造縯化及古沉積揹景控製瞭黃流組內三級層序格架的分佈及縯化，但未控製沉積體繫或儲集砂體的分佈。該沉積體繫與經典海底扇相比，沒有明顯的扇體亞相分異、主水道和天然隄等典型沉積特徵，而為規模小、遷移快、堆積厚的溝道沉積砂體組閤，將其定義為“非典型”重力流，用不同類型溝道+漫流體繫來錶徵其特點。不穩定陸坡揹景通過古地貌形態和物源供給樣式來控製四級層序砂體分佈規律，按溝道沉積水動力特徵及堆積樣式進一步劃分為充蝕溝道、遷移溝道和充填構造，其中充蝕溝道和充填溝道儲集條件好，是有利的勘探目標。
앵가해분지만중신통황류조천해후층니암중발육적괴상후층분세사암시근기천연기감탐열점，기저집사체종향다기첩치、횡향변천쾌。구조연화급고침적배경공제료황류조내삼급층서격가적분포급연화，단미공제침적체계혹저집사체적분포。해침적체계여경전해저선상비，몰유명현적선체아상분이、주수도화천연제등전형침적특정，이위규모소、천이쾌、퇴적후적구도침적사체조합，장기정의위“비전형”중력류，용불동류형구도+만류체계래표정기특점。불은정륙파배경통과고지모형태화물원공급양식래공제사급층서사체분포규률，안구도침적수동력특정급퇴적양식진일보화분위충식구도、천이구도화충전구조，기중충식구도화충전구도저집조건호，시유리적감탐목표。
The massive fine-grained sandstone developed from the thick mudstone lager powder of late Miocene deposits in shallow yellow stream group in Yingge Sea Basin is the recent gas exploration hotspot. The reservoir is sand vertically stacked multi-stage,and changes fast horizontally. Though tectonic evolution and ancient deposition setting control the distribution and evolution of third-order sequences framework within Huangliu Formation,they do not control the distribution of depositional systems or reservoir sand bodies. Compared with the classic submarine fan phase,typical deposition characteristics can hardly be found in this depositional system like obvious fan body sub-phase differentiation,main waterway,levee,etc. It is consid-ered as a channel sand bodies’ combination of small-scale,fast migration,and thick accumulation. In the article,it is called non-typical Turbidity current,using different channels+spring current to show this sedimentary characteristic. The studies suggest that the unstable continental slope setting controls the distribution of sand bodies in four-order sequences by means of controlling the Palaeogeomorphology and sedimentary source rechargement. According to the hydrodynamic characteristics and accumulation styles of the channel deposition,the sand bodies are further divided into the sub-erosion channel,migration channel and filling structure. Among them sub-erosion channel and filling structure have good reservoir conditions,that can be new gainful exploration targets.
