Controlling factors of calcareous interlayers distribution in ultra-low permeability reservoirs:Micro evidence from petrology and diagenesis

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  • 1.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;
    2.College of Geosciences,China University of Petroleum,Beijing 102249,China;
    3.The 5th Oil Production Plant,Changqing Oilfield Company,PetroChina, Xi’an 710018,China

Received date: 2015-07-10

  Revised date: 2015-12-25

  Online published: 2019-09-19

Abstract

Using on the analysis of core,conventional logs,thin section,scanning electron microscopy,etc.,the petrologic and geochemical features,log responses and distribution laws of calcareous interlayers of Chang 6 Formation were studied in Jiyuan Oilfield,then based on  the difference between calcareous and non-calcareous,sandstones was identified to discuss how petrology and diagenesis evolution affect their distribution.The results show that the distribution of calcareous interlayers was closely related to sedimentary microfacies and rock assemblages.It is closely related to the thickness of sandstones and mudstones macroscopically,as well as the genetic types of sandbodies.However,it is comprehensively controlled by the source and pore spaces needed for carbonate cementationin microscopic scales.The thickness of sandstone and the distance between mudstones and sandstones determines the adequacy of material sources.The pore spacesare affected both by petrology and diagenetic evolution.Sandstones which have coarse granularity,good sorting,and high rigid particles can preserve the pore space effectively,so it is likely for the carbonate cement to precipitate.In addition,the space is seriously influenced by the diagenetic alteration.Early compaction and chlorite rim cementation may cause the reduction of space,and they are the dominant diagenesis inhibiting the growth of carbonate.For delta front reservoir,the sandstone near thickmudstone,with higher primary intergranular porosity and lower degree of compaction and chlorite cementation,is prone to be cemented by carbonate.

Cite this article

Liu Li, Bao Zhi-dong, Qin Zhi, Fan Zheng-ping, Lin Yan-bo, Deng Xi-li, An Kai-sheng . Controlling factors of calcareous interlayers distribution in ultra-low permeability reservoirs:Micro evidence from petrology and diagenesis[J]. Natural Gas Geoscience, 2016 , 27(6) : 1035 -1045 . DOI: 10.11764/j.issn.1672-1926.2016.06.1035

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