摘要
为了解决近岸水下扇储层相变快和非均质性强而导致的开发难题,以柴达木盆地七个泉油田E_3~1油藏为例,通过取心井岩性精细描述和分析,结合铸体薄片和测井曲线特征,进行储层构型单元级次划分及多井联合对比,并最大限度地利用密井网动态资料辅助验证,明确了储层构型单元砂体剖面展布特征和规模,建立了各级构型单元的识别特征图版及近岸水下扇内部构型模式。结果表明:目的层E_3~1自下而上可划分为扇根、扇中、扇端亚相,并细分出5个5级构型要素和9个4级构型要素;E_3~1油藏剩余油分布模式包括断层遮挡形成的剩余油、非主流线滞留区的剩余油、不同构型单元间韵律性差别形成的剩余油、坝间低渗缓冲带遮挡形成的剩余油、注采井网不完善形成的剩余油等5种类型。研究结果为七个泉油田进一步挖潜提供了地质依据。
In order to solve the development difficulties caused by rapid phase change of reservoir and strong hetero- geneity in nearshore subaqueous fan, taking the E31 reservoir of Qigequan Oilfield in Qaidam Basin as an example,through lithology description and analysis of coring holes, combined with casting thin section and logging curve characteristics, the reservoir configuration units division and well-tie section comparison were carried out. With the aid of the dynamic data of dense well network, the sand body distribution characteristics and scale in the res- ervoir configuration units were defined, and the identification chart of the configuration units at all levels and the in- ternal configuration pattern of the nearshore subaqueous fan were established. The results show that the target layer E3^1 can be divided into root fan, middle fan and end fan subfacies from bottom to top, and subdivided into five fifth-order configuration elements and nine fourth-order configuration elements. There are five remaining oil dis- tribution patterns of E3^1 reservoir, including remaining oil formed by fault sheltering, remaining oil in non-main- stream line detention zone, remaining oil formed by rhythmic differences between different configuration units, remaining oil formed by dam-permeability buffer zone and remaining oil formed by insufficient formation of injec- tion wells. The results can provide a geological basis for the further exploration of Qigequan Oilfield.
作者
常海燕
严耀祖
陈更新
郭宁
项燚伟
杨会洁
CHANG Haiyan;YAN Yaozu;CHEN Gengxin;GUO Ning;XIANG Yiwei;YANG Huijie(PetroChina Research Institute of Petroleum Exploration ＆ Development-Northwest, Lanzhou 730020, China;Key Laboratory of Reservoir Description, China National Petroleum Corporation, Lanzhou 730020, China;Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China;Department of Natural Gas, PetroChina Qinghai Oilfietd Company, Dunhuang 736202, Gansu, China)
出处
《岩性油气藏》
CSCD
北大核心
2018年第3期143-152,共10页
Lithologic Reservoirs
基金
国家重大科技专项"柴达木复杂构造区油气成藏
关键勘探技术与新领域目标优选"(编号:2016ZX05003-006)
中国石油天然气股份有限公司重大科技专项"柴达木盆地建设高原大油气田勘探开发关键技术研究与应用"(编号:2016E-01)联合资助
关键词
近岸水下扇
单砂体
储层构型
构型界面识别
剩余油分布模式
七个泉油田
柴达木盆地
nearshore subaqueous fan
individual sand body
reservoir configuration
configuration boundaryrecognition
remaining oil distribution pattern
Qigequan Oilfield
Qaidam Basin
