Reservoir fluid evolution and hydrocarbon charge history of the Gasi E13 Oilfield,southwestern Qaidam Basin

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  • (1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.PetroChina Key Laboratory of Basin Structure and Hydrocarbon Accumulation,CNPC,Beijing 100083,China;
    3.School of Geosciences in China Unversity of Petroleum,Qingdao 266580,China;4.Technology Research Institute,
    Fengcheng Field Operation District,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000
    5.Exploration and Development Research Institute,PetroChina Qinghai Oilfield Company,Dunhuang 736202,China)

Received date: 2014-10-11

  Revised date: 2015-06-05

  Online published: 2016-02-10

Abstract

The Gasi Oilfield is a major petroleum province in the Qaidam Basin.The hydrocarbon charge history of the Gasi E13 Oilfield was studied through a detailed reservoir diagenesis and fluid inclusion investigation using optical microscopy,Cathodoluminescence(CL) microscopy,scanning electron microscopy(SEM),XRD,fluid inclusion petrography and microthermometry.The reservoir diagenetic diagenesis comprises the following sequence:an early calcite/Clay cladding→Feldspar dissolution/quartz overgrowth→late calcite/ Feldspar overgrowth→Feldspar overgrowth dissolution/ microcrystalline quartz→dolomitethe→anhydrite chlorite→anhydrite;while the reservoir fluids evolved from alkalic→acidic→alkalic→acidic→ alkalic conditions.The abundance of quartz overgrowth,calcite and illite is negatively correlated with the reservoir quality,whereas chlorite is positively correlated with the reservoir quality.Two episodes of oil charge occurred in the reservoir.The first episode is represented by predominantly yellow fluorescing oil inclusions being contemporaneous with or just prior to the quartz overgrowth.The second episode is represented by blue fluorescing fluid inclusions occurred after the precipitation of dolomite.The two oil charges occurred around 28 Ma and 8 Ma,respectively.The hydrocarbon reservoir model is characterized by an early major accumulation and a late minor charge with multiple concomitant readjustment.

Cite this article

Gui Lili,Zhao Mengjun,Liu Keyu,Luo Mi,Meng Qingyang,Yuan Li,Hao Jiaqing . Reservoir fluid evolution and hydrocarbon charge history of the Gasi E13 Oilfield,southwestern Qaidam Basin[J]. Natural Gas Geoscience, 2016 , 27(2) : 289 -297 . DOI: 10.11764/j.issn.16721926.2016.02.0289

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