摘要
LH-A油田为南海东部珠江口盆地深水新区油田,其所在海域水深400m。开发评价初期,油田钻井少(2口),储层非均质性强,纵向发育有灰岩、灰质砂岩、砂岩等多种岩性储层,同时还交互分布有多层低阻油层,两口井钻遇的储层差异性大,地质特征复杂,储层预测成为本阶段研究难点。通过岩心、铸体薄片等资料分析,利用硬石膏、褐铁矿等胶结物对沉积环境的指示作用完成油田地层划分,解决了储层横向预测的瓶颈问题;同时采用地质统计学反演方法,综合测井、地质、地球物理等资料对储层进行空间预测和描述,特别是薄泥岩夹层的精细刻画。研究表明,LH-A油田ZJ30油藏为块状底水油藏,两口井钻遇的泥岩夹层不连片发育;低阻油层虽呈层状连片分布,但物性较好,不影响油田开发;采用"低平高直中斜"3种井型结合开采ZJ30油藏,预测出了较好的开发效果。
LH- A oilfield locates in new area of deep water of Pearl River Estuary basin in the eastern South China Sea with 400 m of water depth.In early development appraisal period,only two wells were drilled in this oilfield,so reservoir forecast was becoming the research difficulty for complex geologic characteristics,strong heterogeneity and multiple lithology.In the vertical,limestone,calcareous sandstone and sandstone were developed in the reservoirs and multiple low resistivity reservoirs were distributed alternatively.Based on data analysis of core observation and cast thin section,stratigraphic division was completed according to the indicative function of anhydrite,limonite and other cements on depositional environment,which solved the bottleneck problem of transverse reservoir forecast.Meanwhile,geostatistical inversion method was applied to spatial reservoir forecast and reservoir description based on integrated logging,geological and seismic data,especially to fine description of thin mudstone interlayers.The research indicates that ZJ30 oil reservoir of LH-A oilfield is a massive reservoir with bottom water,the mudstone interlayers drilled by two wells are not the same one;the low resistivity reservoirs distribute continuously,but they will not affect the development of the oilfield because of their good physical properties; ＂low horizontal,high vertical,middle incline＂ 3 kinds of well-type are used for developing ZJ30 oil reservoir and it will have great development results.
出处
《中外能源》
CAS
2015年第10期51-55,共5页
Sino-Global Energy
关键词
储层预测
胶结物
沉积环境
地质统计学反演
开发评价
reservoir forecast
cement
depositional environment
geostatistical inversion
development appraisal
