石油勘探与开发2018，Vol.45Issue(2)：212-222,11.DOI:10.11698/PED.2018.02.04
酒泉盆地下白垩统致密油类型、分布特征及勘探领域
Types, distribution and play targets of Lower Cretaceous tight oil in Jiuquan Basin, NW China
摘要
Abstract
Based on drilling and laboratory data,the formation conditions of tight oil reservoirs in the Jiuquan basin were comprehensively analyzed and the exploration domains were sorted out.The Jiuquan basin underwent three cycles of lake level fluctuation in early Cretaceous,leaving three sets of high-quality source rocks,the Zhonggou,Xiagou and Chijinbao Formations in the Lower Cretaceous.There are two types of reservoir assemblages,source-reservoir in one type and source below reservoir type,and two types of tight reservoirs,argillaceous dolomite and conglomerate.The "sweet spots" control the enrichment of oil and gas.Argillaceous dolomite tight oil reservoirs have the characteristic of "integrated source-reservoir",with fractures connecting the matrix micro-pores,pore-fracture type and fracture-pore type "sweet spots" distributed in large scale.The sandy conglomerate tight oil reservoirs were formed by source-reservoir lateral connection,and can be divided into source below reservoir type,source-reservoir side by side type and "sandwich" type.The overlapping areas of the favorable facies belts of fan-delta front and the secondary pore developing belts are the "sweet spot" sites.The favorable areas for seeking conglomerate tight oil are fan-delta front deposits around the Qingxi,Ying'er and Huahai sags,with an exploration area of 550 km2;while the area to seek argillaceous dolomite tight oil is the NW fracture developed belt in Qingxi sag,with an exploration area of 100 km2.关键词
致密油/致密储集层/泥云岩/砂砾岩/下白垩统/酒泉盆地Key words
tight oil/tight reservoir/argillaceous dolomite/sandy conglomerate body/Lower Cretaceous/Jiuquan Basin分类
能源科技引用本文复制引用
陈启林,邓毅林,魏军,马国福,龙礼文,肖文华,李伟,张丽萍..酒泉盆地下白垩统致密油类型、分布特征及勘探领域[J].石油勘探与开发,2018,45(2):212-222,11.基金项目
国家科技重大专项(2017ZX05001) （2017ZX05001）
中国石油天然气股份有限公司重大科技专项(2012E-3301,2012E-3303) （2012E-3301,2012E-3303）
