Types and Distribution of Diagenetic Alterations in the Nearshore Subaqueous Fan of the Upper Es<sub>4</sub> in Shengtuo Area of Dongying Depression

ZHANG Li-qiang，LUO Xiao-rong，XIAO Huan，GAO Yong-ming，TIAN Bing-rui

doi:10.11764/j.issn.1672-1926.2015.01.0013

2015 , Vol. 26 >Issue 1: 13 - 20

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.01.0013

Types and Distribution of Diagenetic Alterations in the Nearshore Subaqueous Fan of the Upper Es₄ in Shengtuo Area of Dongying Depression

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1.School of Geosciences,China University of Petroleum,Qingdao 266580,China;
2.Institute of Geology and Geophysics of Chinese Academy of Sciences,Beijing 100029,China

Received date: 2014-05-10

Revised date: 2015-01-14

Online published: 2015-01-10

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Abstract

Based on observation of core and thin section,combined with petro-physical property,isotopes,and other experimental analyses,types and distribution of diagenetic alterations in different depositional facies and different diagenetic stages were studied from the nearshore subaqueous fans of the Upper Es₄ sandstones in Shengtuo area of Dongying Depression.Diagenetic alterations which were encountered in the nearshore subaqueous fans are diverse.Eogenetic diagenetic alterations include mechanically infiltrated clays,calcite and dolomite cementation.Mesogenetic alterations include ferruginous calcite and ferruginous dolomite cementation,diagenetic clay mineral cementation,quartz overgrowths,and so on.Relationship between diagenetic alterations and facies in the nearshore subaqueous fans are very clear.Eogenetic mechanically infiltrated clays are abundant in sandy conglomerate of channels and interchannels of inner fans.Eogenetic calcite and dolomite cementation are extensive in inner and outer fans.Ferruginous calcite and ferruginous dolomite cementation,and quartz overgrowths are most abundant in mid-fan sandbodies than that in inner and outer fans sandbodies.Dissolution is most clear and reservoir property is best in midfan channel sandbodies.Extensive calcite cements may act as potential sealing layers for the reservoir compartments of underlying sandstones.Integration of diagenesis with depositional facies of nearshore subaqueous fans is beneficial to predict the distribution of diagenetic alterations,and thus on prediction of favorable reservoirs.

Key words： Diagenetic alterations; Sedimentary facies; Nearshore subaqueous fans; Paleogene; Dongying Depression

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ZHANG Li-qiang，LUO Xiao-rong，XIAO Huan，GAO Yong-ming，TIAN Bing-rui . Types and Distribution of Diagenetic Alterations in the Nearshore Subaqueous Fan of the Upper Es₄ in Shengtuo Area of Dongying Depression[J]. Natural Gas Geoscience, 2015 , 26(1) : 13 -20 . DOI: 10.11764/j.issn.1672-1926.2015.01.0013

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