Characteristics of Reservoir and Diagenetic Evolution of Volcanic Rocks in Northwestern Junggar Basin

LI  Wei, HE  Sheng, TAN  Kai-Jun, ZHANG  Fan, ZHAO  Ying-Cheng, YIN  Lu

doi:10.11764/j.issn.1672-1926.2010.06.909

Natural Gas Geoscience >

2010 , Vol. 21 >Issue 6: 909 - 916

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.06.909

Characteristics of Reservoir and Diagenetic Evolution of Volcanic Rocks in Northwestern Junggar Basin

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1.China University of Geosciences,Wuhan 430074,China;
2.Oil Drilling Division of Zhongyuan Petroleum Exploration Bureau,Puyang 457001,China;
3.Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China;
4.Resource and Environment Faculty,Southwest Petroleum University,Chengdu 610059,China

Received date: 2010-01-20

Revised date: 2010-05-13

Online published: 2010-12-10

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Abstract

We studied the lithology,pore characteristics,physical properties,diagenesis,diagenetic stage division and diagenetic evolution history of the volcanic rock reservoir in northwestern Junggar basin by extensive drilling core observation,combining with laboratory analysis (including ordinary thin sections,cast thin sections,scanning electron microscopy,X-ray diffraction and so on).The basic volcanic rocks and acidic volcanics dominated in volcanic rocks.The diverse reservoir interspace included six kinds of primary pore,three kinds of primary fracture，seven kinds of secondary pore and three kinds of secondary fracture，and the pores with poor physical properties were charactered with poor sorting and narrow pore throat radius.The volcanic reservoir had experienced three stages of syndiagenetic stage，epidiagenetic stage and buried diagenetic stage,and a variety of diagenesis including the early diagenesis of welding and condensing contraction,and the late diagenesis of tectonic,weathering and leaching,dissolution,zeolitization，chloritization.Different types of reservoir space were formed in different diagenetic evolution stages.There formed the primary pores and condensation contraction fractures in syndiagenetic stage,some filled secondary pores and weathering sutures in epidiagenetic stage,secondary pores,structural fractures and dissolved fractures in the burial diagenetic stage.

Key words： Junggar basin; Volcanic rocks; Reservoir characteristics; Diagenesis; Diagenetic stage.

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LI Wei, HE Sheng, TAN Kai-Jun, ZHANG Fan, ZHAO Ying-Cheng, YIN Lu . Characteristics of Reservoir and Diagenetic Evolution of Volcanic Rocks in Northwestern Junggar Basin[J]. Natural Gas Geoscience, 2010 , 21(6) : 909 -916 . DOI: 10.11764/j.issn.1672-1926.2010.06.909

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