Formation geological conditions and its resources potential of tight oil in Yili Basin,China

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  • 1.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;
    2.China University of Petroleum-Beijing,Beijing 102249,China

Received date: 2016-04-03

  Revised date: 2016-06-05

  Online published: 2019-09-11

Abstract

The significant progress in tight oil exploration and development and its resource evaluation in domestic and foreign have been made recently.Tight oil in China is mainly distributed in the five major petroliferous basins such as Ordos Basin,Songliao Basin,Junggar Basin,Sichuan Basin and Bohai Bay Basin.However,the potential of tight oil resources in many middle-small basins is worthy of attention.There are four common formation conditions in the tight oil enrichment zone at home and abroad,that are wide and slow sedimentary background in basin/depression center,large area distribution of tight reservoir,high quality hydrocarbon source rocks with wide coverage,and reservoirs in close contact with source rocks.Those can be used to study and comparatively analyze the formation conditions of tight oil in medium-small basins.Based on the physical workloads such as field profile observation,outcrop samples and drilling core observation and previous data analysis and so on,this paper analyzed the geological conditions,resource potential and favorable zones of tight oil formation in Yili Basin for the first time.It is considered that deep-half deep lake facies thick dark mudstones of Middle Permian in Yili Basin widely covered,with medium-better hydrocarbon generation indexes,higher maturity and hydrocarbon generation potential.Middle Permian reservoir sand bodies distributed with large-area in the Yining Sag,with bad to medium physical property and tight reservoir feature.Middle Permian reservoirs and source rocks are vertically overlapped,with combination of reservoirs and caps.So it is conducive to hydrocarbon accumulation near the source rocks,and the source rocks have basic matching with reservoirs.Flat sedimentary background and gypsum/salt bed developed in Yining Sag.The formation and enrichment of tight oil can be controlled by the preservation conditions.According to the evaluation criteria and the initial conditions of tight oil resources,by using the volumetric evaluation method,tight oil geological resources of Middle Permian Tiemulike Formation (P2t) in Yining Sag are 3.43×108tons,technology recoverable resources of 3086×104tons.According to comprehensive evaluation,basic conditions of tight oil forming and certain exploration prospects are possessed in Yili Basin.Related flat sedimentary background and pre-salt strata developed in the central sub-sag belt and southern slope belt of Yining Sag.They should be the main direction of tight oil exploration in the next step and favorable exploration areas.

Cite this article

Yu Yuan-jiang, Wang She-jiao, Zhang Hong, Wu Xiao-zhi . Formation geological conditions and its resources potential of tight oil in Yili Basin,China[J]. Natural Gas Geoscience, 2016 , 27(9) : 1709 -1720 . DOI: 10.11764/j.issn.1672-1926.2016.09.1709

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