岩性油气藏
巖性油氣藏
암성유기장
LITHOLOGIC RESERVOIRS
2011年
6期
30-36,43
,共8页
贺静%冯胜斌%袁效奇%韩鹏%解古巍%张才利
賀靜%馮勝斌%袁效奇%韓鵬%解古巍%張纔利
하정%풍성빈%원효기%한붕%해고외%장재리
露头剖面%延长组%砂岩组分%鄂尔多斯盆地
露頭剖麵%延長組%砂巖組分%鄂爾多斯盆地
로두부면%연장조%사암조분%악이다사분지
outcrop section%Yanchang Formation%sandstone component%Ordos Basin
鄂尔多斯盆地周缘延长组露头剖面发育,地层出露齐全,是研究陆相湖盆沉积特征和生油特征的有利地区。该文对周缘延长组露头剖面作了系统采样和测定,显微镜下观察了砂岩碎屑组分,并采用计点法对组分进行了统计。根据碎屑组分与重矿物组合特征,结合盆地内部钻井剖面碎屑组分特征,对延长组物源进行了探讨。研究认为：鄂尔多斯盆地晚三叠世延长组沉积期存在东北、东南、西南、西部、西北及北部等多个不同方向的物源,其中东北、西部和西北物源控制的沉积体系延伸远、分布范围广;不同物源控制沉积体系及同一沉积体系不同沉积期砂岩的碎屑组分、重矿物组合及填隙物成分和组合存在较大差异。综合研究表明,盆地周缘延长组露头剖面砂岩组分特征研究对盆地物源分析和沉积体系划分、砂体展布、有利储层预测、钻井剖面地层对比及井位部署和储层改造均具有重要意义。
鄂爾多斯盆地週緣延長組露頭剖麵髮育,地層齣露齊全,是研究陸相湖盆沉積特徵和生油特徵的有利地區。該文對週緣延長組露頭剖麵作瞭繫統採樣和測定,顯微鏡下觀察瞭砂巖碎屑組分,併採用計點法對組分進行瞭統計。根據碎屑組分與重礦物組閤特徵,結閤盆地內部鑽井剖麵碎屑組分特徵,對延長組物源進行瞭探討。研究認為：鄂爾多斯盆地晚三疊世延長組沉積期存在東北、東南、西南、西部、西北及北部等多箇不同方嚮的物源,其中東北、西部和西北物源控製的沉積體繫延伸遠、分佈範圍廣;不同物源控製沉積體繫及同一沉積體繫不同沉積期砂巖的碎屑組分、重礦物組閤及填隙物成分和組閤存在較大差異。綜閤研究錶明,盆地週緣延長組露頭剖麵砂巖組分特徵研究對盆地物源分析和沉積體繫劃分、砂體展佈、有利儲層預測、鑽井剖麵地層對比及井位部署和儲層改造均具有重要意義。
악이다사분지주연연장조로두부면발육,지층출로제전,시연구륙상호분침적특정화생유특정적유리지구。해문대주연연장조로두부면작료계통채양화측정,현미경하관찰료사암쇄설조분,병채용계점법대조분진행료통계。근거쇄설조분여중광물조합특정,결합분지내부찬정부면쇄설조분특정,대연장조물원진행료탐토。연구인위：악이다사분지만삼첩세연장조침적기존재동북、동남、서남、서부、서북급북부등다개불동방향적물원,기중동북、서부화서북물원공제적침적체계연신원、분포범위엄;불동물원공제침적체계급동일침적체계불동침적기사암적쇄설조분、중광물조합급전극물성분화조합존재교대차이。종합연구표명,분지주연연장조로두부면사암조분특정연구대분지물원분석화침적체계화분、사체전포、유리저층예측、찬정부면지층대비급정위부서화저층개조균구유중요의의。
Outcrops of Yanchang Formation in the margin of Ordos Basin are widely spread with abundant strata. It is favorable area for research of sedimentary and hydrocarbon generation characteristics in lacustrine basin. According to systematic sampling and measurement of the outcrops of Yanchang Formation, combining with sandstone detrital component analysis, this paper discussed the provenance of Yanchang Formation. It is considered that there exist several provenances from different orientation in Late Triassic in Ordos Basin, including east-north, east-south, west-south, west, west-north and north, and sedimentary systems which dominated by the east-north, west and west-north proveniences spread widely. There are great differences of detrital components, heavy mineral assemblages, and interstitial material components and assemblages of sandstones under different sedimentary systems that dominated by different provenances or different depositional stages in the same sedimentary system. Comprehensive studies indicate that the research of sandstone component characteristics of outcrops has great significance for provenience analysis, sedimentary systems division, sand body distribution and favorable reservoir prediction, stratigraphic correlation between outcrops and cores, exploratory well deployment and reservoir reconstruction.
