Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 651-660.doi: 10.13278/j.cnki.jjuese.201603103

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Key Formations of the Permian Hydrocarbon Source Rocks and Oil-Source Correlation of well KD1 in Yecheng Depression of Southwestern Tarim Basin

Du Zhili1,2, Zeng Changmin3, Qiu Haijun2, Yang Youxing2, Zhang Liang3   

  1. 1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    2. Oil & Gas Survey, China Geological Survey, Beijing 100029, China;
    3. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, Korla 841000, Xinjiang, China
  • Received:2015-10-02 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by the Project of National Oil and Gas Resources Survey and Strategic Selections, Ministry of Land and Resources (1211302108022)

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Abstract:

Permian is the main period for the accumulation of the hydrocarbon source rocks in the Yecheng depression of southwestern Tarim basin. Previous works hitherto have commonly treated simply the Permian oil-shales as a marine or lacustrine hydrocarbon source rocks, which have ignored an important fact that different formations of the Permian formed in different sedimentary environments, and show different sedimentary facies and have different oil and gas potentials. Based on the geological survey in Yecheng depression, combined with the drilling data, our results indicate that the key source units include Qipan and Pusige Formations. They are the main Permian source rocks in Yecheng (in the northwest) and Hetian (in the southeast) areas of the Yecheng depression. According to facies analysis and organic geochemical results, we interpreted that the Qipan Formation was deposited in a shallow marine shelf environment and distributed in Heshilafu-Momoke area of the northwestern Yecheng depression. The average thickness of source rock is more than 100 meters, the type Ⅱ organic matter have reached a high maturity evolution stage. In contrast, Pusige Formation was deposited in a lacustrine facies sedimentary environment and distributed in Pusha-Duwa area, the average thickness of source rock is more than 200 meters. It shows an average TOC content of 0.97% and type Ⅱ or Ⅲ organic matter which has reached the peak stage of hydrocarbon generation. Concerning the hydrocarbon potential of the two formations, Upper Pusige Formation is better than Qipan Formation. In order to trace the oil-source of a nearby commercial well KD1, we correlate the data sets of radiometric carbon isotope ratios and biomarkers of normal alkanes between the oil and different source rocks. Our results show that the oil trapped in the well KD1 comes from the Upper Pusige Formation source rocks. Combined with the comprehensive analysis of the petroleum system, we indicated that the most favorable exploration target in the region is the area of Fusha-Keliyang in the eastern Yecheng depression.

Key words: Tarim basin, Yecheng depression, Permian, shallow marine and lacustrine source rocks, Pusige Formation, Qipan Formation

CLC Number: 

  • P618.13

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