Natural Gas Geoscience

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Caprocks characteristics and their control on hydrocarbon accumulation of bedrock gas reservoirs in eastern segment of Alkin Piedmont,Qaidam Basin

Li Hong-zhe,Ma Feng,Xie Mei,Yang Wei,Zhang Cheng-juan,Wang Pu,Zhao Jian   

  1. 1.PetroChina Research Institute of Petroleum Exploration &  Development-Northwest (NWGI),Lanzhou 730020,China;
    2.Research Institute of Exploration & Development,PetroChina Qinghai Oilfield Company,Dunhuang 736202,China;
    3.Dring & Production Technology Research Institute,PetroChina Qinghai Oilfield Company,Dunhuang 736202,China;
    4.Key Laboratory of Reservoir Description,PetroChina Research Institute of Petroleum Exploration &  Development-Northwest (NWGI),Lanzhou 730020,China
  • Received:2018-03-22 Revised:2018-05-17 Online:2018-08-10 Published:2018-08-10

Abstract: Based on the analysis of core facies,logging facies and seismic facies of Paleogenlulehee in the eastern part of Alkin Piedmont,it is found that regional gypsum-salt cap rocks developed in the Early Paleogene.The lithology was mainly gypsum mudstone and creaming mudstone,and with little gyprock.The gypsum-salt rocks mainly developed in the bottom of Lulehe Formation in vertical,and formed 4 areas with largest thickness in horizon,including northern Jiandingshan,western Dongping,Dongping and Niuzhong,and thinned gradually from west to east.In the study area,the formation and distribution of gypsum-salt rocks was jointly controlled by palaeogeomorphology,paleoclimate and sediment supply before the Paleogene deposits.A well match between development degree of gypsum-salt rocks and hydrocarbon distribution was proved:Gypsum-salt rocks with lager thickness formed structural,lithologic and stratigraphic reservoirs in underlying bed rocks,with well hydrocarbon preserving and accumulative conditions;and those with less gypsum-salt rocks formed regional cap rocks and structural reservoirs with multiple layers.Above all,the gypsum-salt cap rocks developed in Lulehe Formation in the eastern part of Alkin Piedmont controlled natural gas enrichment effectually,pointing out a direction for predicting favorable areas of coal-type gas in Qaidam Basin.

Key words: Eastern segment of Alkin Piedmont, Gypsum-salt rocks, Bedrock, Caprock, Paleogenesystem

CLC Number: 

  • TE121.1


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