摘要
基于岩心观察和系统的微观岩石学和结构学特征研究,探究了英西地区渐新统的储集层特征、油气富集模式及稳产、高产主控因素:(1)目的层岩性以湖相碳酸盐岩为主,可分为盐间和盐下两套地层,盐间广泛发育厚盐层,以石盐为主,盐下零星发育薄盐层,以硬石膏为主;(2)咸化条件下沉积的这套细粒的湖相碳酸盐岩,既是品质最好的烃源岩,又发育白云岩"甜点"储集层,具有自生自储特征(上部盐层因具有很高的毛管突破压力和塑性特征而具有很强的封盖能力,且盐下应力集中造缝),其多因素的良好匹配形成了盐下油气规模富集的有利区;(3)基质晶间孔的发育程度控制着油气藏的规模和稳产,微裂缝的发育程度控制着油气藏的富集和高产。这一研究成果对深入研究英西E_3~2盐下油气的分布规律和下一步勘探部署具有重要的指导意义。
Based on core observation and system research of the micro petrological and structural characteristics,reservoir characteristics,petroleum and gas enrichment pattern and major controlling factors of stable and high production of Oligocene reservoir in the Yingxi area of Qaidam were summed up：（1） Lithology of objective layer is mainly lake facies carbonate rocks,which can be divided into inter-salt and subsalt strata. Many thick salt layers widely developed in inter-salt strata which is halite. A scattering of thin salt layers developed in subsalt strata which is gypsum.（2） The fine-grained lake facies carbonate rocks were deposited under the saline conditions,which is not only the best quality hydrocarbon source rock,but also develops ＂ dessert＂ dolo-mite reservoir. This set of strata is characteristic of＂authigenic source rock and authigenic reservoir＂. The upper salt layers have strong sealing ability because of its very high capillary breakthrough pressure and plastic characteristics. Geological stress of the upper salt layers is relatively concentrated,which is easy to create cracks. The good matching relationship between all of the above factors formed the subsalt favorable areas with oil and gas enrichment on a large scale.（3） The development degree of the matrix intergranular pores controls the scale of oil and gas reservoirs and stable production. The development degree of micro cracks controls the enrichment of oil and gas reservoirs and high production. The research results have important guiding significance for the further research about subsalt oil and gas distributing disciplinarian and the further exploration deployment of E3^2 in the Yingxi area.
作者
黄成刚
倪祥龙
马新民
高妍芳
张昭
杨森
崔俊
赵权
HUANG Chenggang NI Xianglong MA Xinmin GAO Yanfang ZHANG Zhao YANG Sen CUI Jun ZHAO Quan(Key Lab of Reservoir Description of CNPC, Lanzhou 730020, China Northwest Branch of Research Institute of Petroleum Exploration and Development, Petrochina, Lanzhou 730020, China Qinghai Oilfield Company of CNPC, Dunhuang 736202, China)
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第5期724-738,共15页
Journal of Northwest University（Natural Science Edition）
基金
国家油气专项基金资助项目(2016ZX05003006)
中国石油重大科技专项基金资助项目(2011E-03)
关键词
柴达木盆地
咸化湖盆
E32
富集模式
稳产高产
白云石晶间孔
微裂缝
Qaidam Basin
saline lacustrine basin
E3 ^2
enrichment pattern
stable and high production
intercrystalline pores of dolomite
micro cracks
