A study of source rocks & carbonate reservoirs and its implication on exploration playsfrom Sinian to Lower Paleozoic in the east of Tarim Basin,northwest China

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  • 1.PetroChina Hangzhou Research Institute of Petroleum Geology,Hangzhou 310023,China;
    2.CNPC Key Laboratory of Carbonate Reservoirs,Hangzhou 310023,China;
    3.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China;
    4.Exploration and Development Institute of Daqing Oilfield Company,Daqing 163712,China

Received date: 2017-06-28

  Revised date: 2017-08-26

  Online published: 2018-01-10

Abstract

With 27 years exploration of Sinian to Lower Paleozoic carbonate rocks in eastern Tarim Basin,hydrocarbon shows and some industrial oil and gas wells have been discovered there.However,so far no scale reserves and production have been obtained.Hydrocarbon generation,distribution of scaled resources &reservoirs are the key constraints.In this paper,with observation of outcrops,cores,thin sections,and analyses of well-log,geochemical test data,four new understandings have been put forward.Firstly,on the basis of previous thoughts that there are two sets of source rocks,Middle-Lower Cambrian and Middle-Lower Ordovician source rock,another two sets of source rocks,Sinian and Upper Ordovician source rocks,have been newly discovered.Secondly,the new understanding of burial history changed the previous view that rapid burial of source rocks and high-over maturity lead to short time hydrocarbon generation window and limited hydrocarbon amount.It's thought that the source rocks maintained in the oil window for a long-term from Late Ordovician to the Late Permian.And four sets of source rocks have plenty time to generate much liquid hydrocarbon.Thirdly,guided by the former thought of oil cracked gas in Indosinian and Yanshan epochs,it's believed that rapid deep burial in Himalayan might cause stranded and dispersed liquid hydrocarbon in source rocks to relay hydrocarbon.Fourthly,five types of Sinian to Lower Paleozoic reservoirs are recognized in eastern Tarim Basin.They are all dominated by sedimentary facies and scaled reservoirs would be predictable.These understandings made (1.92-2.01)×102m3 gas resources confirmed and strengthened the exploration expection of Sinian to Lower Paleozoic carbonate rocks in the eastern Tarim Basin,and would promote the exploration of the two realistic plays,Tadong uplift and Gucheng low uplift,and the evaluation of three potential plays.
 

Cite this article

Shen An-jiang,Fu Xiao-dong,Zhang You,Zheng Xing-ping,Liu Wei,Shao Guan-ming,Cao Yan-qing . A study of source rocks & carbonate reservoirs and its implication on exploration playsfrom Sinian to Lower Paleozoic in the east of Tarim Basin,northwest China[J]. Natural Gas Geoscience, 2018 , 29(1) : 1 -16 . DOI: 10.11764/j.issn.1672-1926.2017.08.019

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