Characteristics of Ordovician fault in the Block 10 of Tahe Oilfield, Tarim Basin and its controlling effect on karst reservoirs

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  • 1.School of Geosciences,China University of Petroleum,Qingdao 266580,China;
    2.Northwest Oilfield Company,SINOPEC,Urumqi 830011,China;
    3.Shixi Oil Production Plant,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

Received date: 2015-07-10

  Revised date: 2015-09-05

  Online published: 2019-09-20

Abstract

As with the development of exploring and developing of Ordovician carbonate reservoirs in Tarim Basin,the controlling effect of fault on carbonate reservoirs has drawn more and more attention.On the basis of cores,thin sections,drilling and well-logginganalyses,the reservoir is classified into three types,dissolution vug,dissolution pore-fracture and fractures.According to the structural evolution characteristics,taking fault times,scale and the controlling effect of karst reservoirs into consideration,the faults are classified into three grades including grade Ⅱ,grade Ⅲ-1 and grade Ⅲ-2.Faults’ controlling effect on the development of karst reservoirs and oil and gas entrapment were systematicallysummarized.Based on the comprehensive analysis,Ordovician in the Block 10 of Tahe Oilfield mainly developed three periods of faults,respectively in Late Caledonian,Early Hercynian and Late Hercynian.The Hercynian fracture plays decisive role in the formation and development of karst reservoirs,and grade Ⅱ and grade Ⅲ-1 turn out to be the most important for the development of karst reservoirs and oil and gas entrapment.Faults not only promote development of shallow karst and the formation of fractures,but also control the ancient geomorphology,the distribution of ancient water system and hydrothermal karstification.At the same time,the faults also play an important role in controlling the migration and accumulation of oil and gas.The understanding provides significant guidance of further exploration and development of carbonate oil and gas reservoir.

Cite this article

Han Chang-cheng, Lin Cheng-yan, Ren Li-hua, Lu Xin-bian, Wei Ting, Zhang Xian-guo . Characteristics of Ordovician fault in the Block 10 of Tahe Oilfield, Tarim Basin and its controlling effect on karst reservoirs[J]. Natural Gas Geoscience, 2016 , 27(5) : 790 -798 . DOI: 10.11764/j.issn.1672-1926.2016.05.0790

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