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The sedimentary environment and geochemical characteristics of the source rocks in the Pusige Formation in Hetian Sag,southwestern Tarim Basin,China

Wang Jing-bin,Gao Zhi-qian,Kang Zhi-hong,Yang You-xing,Wei Duan,Qin Nian-tong
 
  

  1. 1.School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;2.Ministry of Education Key Laboratory of Marine Reservoir Evolution and HydrocarbonEnrichment Mechanism,China University of Geosciences (Beijing),Beijing 100083,China;3.Oil &Gas Survey,China Geological Survey,Beijing 100029,China
  • Received:2016-10-13 Revised:2017-04-18 Online:2017-11-10 Published:2017-11-10

Abstract:

Based on the outcrop section and new well drilling data and organic geochemical analysis results in the Duwa region,a detailed comparative study about hydrocarbon source rocks was conducted.The results suggested that the hydrocarbon source rocks developed in the sub facies of lakeside,shallow lake and semi-deep lake sub.And it had lower Pr/Ph ratio,higher gammacerane ratio,which reflected the source rocks were the products of lake facies and had a stronger reducibility,higher salty sedimentary environment and a certain water column.The Wuluwusitang and Duwa region were the subsidence center of the source rocks.The OM (organic matter) was between 0.12% and 5.68%,which was in the “poor to medium” level.The type of OM was mainly typeⅡ and Ⅲ.The vitrinite reflectance was between 0.72% and 1.385%,which suggested most of hydrocarbon source rocks had entered the mature to high-mature stage.A comprehensive analysis which included the seismic data and the condition of the source rocks,reservoir and cap was conducted.The source rocks of the Pusige Formation still have a certain potential for generating hydrocarbon.And the nappe system is the potential good exploration area which generates oil and gas,and the quasi in situ is the most favorable oil and gas exploration area in the front of Duwa region mount,and because of the deeper burial depth,the in situ system is one of the most difficult challenges for the exploration work.
Hetian Sag;Pusige Formation;Hydrocarbon source rocks;Sedimentary environment;Geochemical characteristics

CLC Number: 

  • TE122.1+13

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