Characteristics of Xujiahe Formation Source Rock and Process of Hydrocarbon-Generation Evolution in Puguang Area
Li Songfeng
Wang Shenglang
Bi Jianxia
Zeng Zhengqing
He Yanmei
Abstract：The source rock characteristics,which can be evaluated quantitatively by the geophysical prediction,are the basis of the hy-drocarbon-generation evolution study.However,it is difficult to carry out a quantitative evaluation of the total organic carbon (TOC) content and thickness for the source rock in Puguang area due to lack of available drillings.The TOC content and thickness of Xujiahe Formation source rock in Puguang area were geophysically predicted by the quantitative prediction technology of the TOC volume in this study.The results show that Xujiahe Formation is mainly a fair source rock with the TOC values ranging from 0.6% to 1.5%,and the distribution of the TOC content is mainly in the banded structure.The general thickness of the effective source rock ranges from 20 to 30 m in Xusan Member,and 30 to 40 m in Xuwu Member,respectively.The erosion thickness is about 2 000 to 5 000 m with a decrea-sing trend from the high part of the structure to both sides of the study area at Late Yanshanian.At the end of Jurassic,Xusan Member source rock reached the mature stage in most areas;but for Xuwu Member,only the source rock in the northern sag reached the ma-ture stage and the hydrocarbon threshold.At present,Xusan and Xuwu Member source rocks are basically in the high maturity-over mature stage generating gas mainly,and the maturity decreases from north to south.
Keywords：organic carbon contentsource rockgeophysical predictionhydrocarbon-generation evolutionPuguang areape-troleum geology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 843-852 )