Main Control Factors and Analysis of Reservoir Space Evolution of Reef-Beach Facies in Changxing - Feixianguan Formation of northeastern Sichuan Area

LI  Xiao-yan,WANG Qi,HAN Yuan-hong,TIAN Bing,XU Yong,WANG Fei-fei

doi:10.11764/j.issn.1672-1926.2014.10.1594

2014 , Vol. 25 >Issue 10: 1594 - 1602

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.10.1594

Main Control Factors and Analysis of Reservoir Space Evolution of Reef-Beach Facies in Changxing - Feixianguan Formation of northeastern Sichuan Area

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(1.Lanzhou Library of Chinese Academy of Sciences,Lanz hou 730000,China；2.Key Laboratory of Petroleum Resources Research,Gansu Province/ Key Laboratory of Petroleum Resources Research,
Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China；
3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China；
4.Research Institute of Shaanxi Yanchang Petoroleum(Group)CO.,LTD,xi′an 710075,China)

Received date: 2014-03-16

Revised date: 2014-05-16

Online published: 2014-10-10

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Abstract

The Platform margin reef-beach facies and shoals facies were the foundation for high-quality reservoir development in Changxing-Feixianguan Formation of Northeastern Sichuan Area.Today's reservoir pore type is dominated by secondary porosity,including intergranular pore,interquartz pore,biological visceral pore,various types of dissolved pore,and cracks.Primary porosity has basically been transformed by diagenesis.Among them,interquartz pore,corrosion pore and cracks are the main reservoir space in the study area.In geological history,the study area has experienced seven kinds of main diagenesis,which have different effects on the reef-beach and shoals depositional system,especially the dolomitization,dissolution and fracturing.These effect results provide conditions for the development of high-quality reservoir:dolomitization transformed the reservoir pore structure of reef-beach facies,dissolution expanded solution pore types further,fracturing interconnected pores and provide migration pathways.Based on the SEM analyses and identification of core and flakes,reservoir space development features,diagenetic environment,rock characteristics and reservoir developmental conditions,the development of high quality reservoir system of reef-beach facies of different rock types in the study area is mainly controlled by three factors:reef-beach sedimentary microfacies,diagenesis,tectonic disruption.Under these three controlling factors,reef-beach facies reservoir porosity of Changxing Formation and Feixianguan Formation has a similar developmental process.They all experienced four-stage evolution process,and the slight difference is its pore types.The Changxing Formation porosity evolution process can be divided into original hole,intergranular hole,early burial dissolution hole and late burial dissolution|The Feixianguan Formation porosity evolution process can be divided into primary hole,oolitic die hole/grains dissolved pores,shallow holes and deep holes.In summary,dolomitization,fracturing,and dissolution are the key factors for reef-beach facies to develop into high quality reservoir.

Key words： Diagenesis; Porosity; Reef reservoirs; Dolomitization; Northeast Sichuan area; Changxing-Feixianguan Formation

Cite this article

LI Xiao-yan,WANG Qi,HAN Yuan-hong,TIAN Bing,XU Yong,WANG Fei-fei . Main Control Factors and Analysis of Reservoir Space Evolution of Reef-Beach Facies in Changxing - Feixianguan Formation of northeastern Sichuan Area[J]. Natural Gas Geoscience, 2014 , 25(10) : 1594 -1602 . DOI: 10.11764/j.issn.1672-1926.2014.10.1594

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