天然气地球科学

• 天然气地质学 • 上一篇    下一篇

柴达木盆地坪西地区基岩气藏储层特征

李延丽1,苟迎春1,2,马新民1,李程程3,王朴1,2,陈芳芳3   

  1. 1.中国石油勘探开发研究院西北分院,甘肃 兰州 730020; 2.中国石油天然气集团公司油藏描述重点实验室,甘肃 兰州 730020; 3.中国石油青海油田勘探开发研究院,甘肃 敦煌 736202
  • 收稿日期:2018-10-15 修回日期:2018-12-08 出版日期:2019-02-10
  • 作者简介:李延丽(1973-),女,陕西韩城人,高级工程师,主要从事测井及综合地质研究.E-mail:li_yanli@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05007-006);中国石油天然气股份有限公司重大专项“柴达木盆地老气区控水稳气及新气区高效开发技术研究”(编号:2016E-0106GR)联合资助.

Reservoir characteristics of bedrock gas reservoir in Pingxi area,Qaidam Basin

Li Yan-li1,Gou Ying-chun1,2,Ma Xin-ming1,Li Cheng-cheng3,Wang Pu1,2,Chen Fang-fang3   

  1. 1.Northwest Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China;
    2.Key Lab of Reservoir Description of CNPC,Lanzhou 730020,China;
    3.Research Institute of Exploration & Development,PetroChina Qinghai Oilfield Company,Dunhuang 736202,China
  • Received:2018-10-15 Revised:2018-12-08 Online:2019-02-10

摘要: 柴达木盆地东坪气田是近年来发现的国内外罕见的基岩古潜山气藏,坪西地区属东坪气田三大断块之一,是东坪基岩气田主要潜力区之一。综合利用岩心观察、薄片分析、X-射线衍射分析及激光共聚焦、CT扫描等实验室分析资料,明确了坪西基岩气藏的岩性特征及储集空间类型;综合试气资料、构造解释成果及裂缝地震属性资料,揭示了坪西基岩气藏的成藏特征及主控因素。研究认为,坪西基岩气藏岩性主要为变质灰岩、板岩及板岩与变质灰岩的混杂岩,储集空间类型主要为构造缝、溶蚀缝及溶蚀孔。变质灰岩和板岩因发育高角度缝和层理缝,是最有利的储集岩性。坪西基岩气藏为具裂缝、基质孔双重孔隙结构的复杂变质岩构造—裂缝型气藏,构造和裂缝是成藏的主要控制因素,构造控制了气层的分布,与气源断裂相伴生的裂缝控制了天然气的富集。研究成果对坪西基岩气藏的勘探开发提供了地质理论依据及技术支撑,具有现实指导意义。

关键词: 基岩气藏, 变质岩, 储层特征, 成藏, 坪西地区, 柴达木盆地

Abstract: Dongping Gas Field is a newly discovered rare massive,buried-hill and bedrock gas reservoir in the Qaidam Basin.As one of the three fault blocks of Dongping Gas Field,Pingxi area is one of the main potential areas of Dongping bedrock gas reservoir.Based on core,thin-section identification,X-ray diffraction analysis,laser confocal scanning,and CT scanning as well as test data,we identified the lithology characteristics and reservoir space types of Pingxi bedrock gas reservoir.Combined with gas production test,structure interpretation and fracture prediction,the gas accumulation characteristic and major controlling factors of Pingxi basement gas reservoir are revealed.The study indicates that the lithology is mainly composed of metamorphic limestone,slate and melange,reservoir space is mainly structural fracture,dissolution fracture and corrosion pore in basement gas reservoir in Pingxi area.Metamorphic limestone and slate are the most favorable reservoir because of their high angle fractures and bedding fractures.Pingxi bedrock gas reservoir is a structure-fracture gas reservoir with fracture and matrix pore of complex metamorphic rock.Structure and fracture are the main controlling factors of reservoir formation.The structure controls gas distribution and the fracture associated with gas source faults controls hydrocarbon enrichment.The research results provide geological theory basis and technical support for the exploration and development of Pingxi bedrock gas reservoir and practical guiding significance.

Key words: Bedrock gas reservoir, Metamorphic rock, Reservoir characteristics, Hydrocarbon accumulation, Pingxi area, Qaidam Basin

中图分类号: 

  • TE122.2
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