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渤海湾盆地大型基岩潜山储层特征及其控制因素 ——以渤中19-6凝析气田为例
投稿时间:2020-09-10  修订日期:2020-12-27  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2021132
摘要点击次数: 98
全文下载次数: 110
作者单位地址
叶涛 中海石油中国有限公司天津分公司 天津 成都理工大学 沉积地质研究院 成都 天津市滨海新区海川路2121号渤海石油管理局B座1107
牛成民 中海石油中国有限公司天津分公司 天津 
王清斌 中海石油中国有限公司天津分公司 天津 
代黎明 中海石油中国有限公司天津分公司 
刘晓健 中海石油中国有限公司天津分公司 天津 成都理工大学 沉积地质研究院 成都 
基金项目:国家油气重大专项“渤海海域勘探新领域及关键技术研究”(2016ZX05024-003)资助
中文摘要:渤中19-6气田是渤海湾盆地近期发现的规模最大的深层变质基岩凝析气田,探明储量超过千亿立方米,气柱高度超1000 m,现今埋深大于4000 m,储层规模大但非均质性强。基于三维地震、钻井、测井以及薄片资料,明确了基岩潜山储层的发育特征,并探讨了优质储层形成的主控因素。结果表明:基岩潜山以太古宇变质花岗岩为主要的储集岩性,储集空间主要为构造裂缝,同时发育沿裂缝溶蚀形成的孔隙及构造破碎粒间孔,平均孔隙度为5%,平均渗透率为6.48×10-3μm2。脆性岩石、构造挤压以及风化作用共同控制了规模性储层的形成: ① 研究区90%的岩石为低抗压强度的变质花岗岩,为裂缝的形成提供了物质基础;② 印支期强烈的挤压为规模性裂缝的形成提供了外部动力,是大规模储层发育最为关键的因素;不同构造位置裂缝发育程度不同,造成了储层平面分布的非均质性;③ 长期的风化作用使得潜山上部300m以内的储集物性得到进一步改善,控制了潜山垂向上储层的非均质性。
中文关键词:太古界  变质基岩潜山  储层特征  控制因素  渤海湾盆地
 
Characteristics and controlling factors of large bedrock buried-hill reservoirs in Bohai Bay basin --a case study of BZ19-6 condensate field
Author NameAffiliationAddress
Ye Tao Tianjin branch of China National Offshore Oil Company Ltd,Tianjin 天津市滨海新区海川路2121号渤海石油管理局B座1107
Niu Chengmin Tianjin branch of China National Offshore Oil Company Ltd,Tianjin 
Wang Qingbin Tianjin branch of China National Offshore Oil Company Ltd,Tianjin 
Dai Liming Tianjin branch of China National Offshore Oil Company Ltd,Tianjin 
Liu Xiaojian Tianjin branch of China National Offshore Oil Company Ltd,Tianjin 
Abstract:With proven reserves over 100 billion cubic meters, gas column height over 1000m and buried depth over 4000 m, Bozhong 19-6 gas field is the largest deep-buried condensate gas field recently discovered in Bohai Bay Basin, whose reservoir is large while with strong heterogeneous. Based on the 3D seismic, drilling, well logging and thin section data, the characteristics of the buried rock reservoir are clarified, and the main controlling factors of the formation of high-quality reservoir are discussed. The results show that the bedrock reservoirs is mainly composed of metamorphic granite, and the storage space is mainly structural fractures, while the dissolved pores along fractures and the crushed inter-granular holes are developed as well, resulting an average porosity of 5% and an average permeability of 6.48×10-3 μm2. Lithology, tectonic activity and weathering jointly control the formation of large-scale reservoirs: (1) 90% of the rocks in the study area are metamorphic granites with high content of feldspar minerals and high brittleness, which provide the material basis for the formation of fractures; (2) The intense compression during Indosinian period provides external power for the formation of large-scale fractures, which is the most critical factor for the development of large-scale reservoirs. The heterogeneity of reservoir plane distribution is response for the different degree of fracture development in different structural locations; (3) Long-term weathering has further improved the reservoir properties within 300 m of the upper part of the buried hill, which controlling the vertical heterogeneity of the buried hill. Those understandings have important reference significance for the future exploration of bedrock buried hill in rifting basins.
keywords:Archean  Metamorphic bedrock buried hills  reservoir characteristics  control factors  Bohai Bay Basin
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