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Chinese Science Bulletin

, Volume 49, Supplement 1, pp 60–65 | Cite as

Petroleum enrichment characteristics in Ordovician carbonates in Lunnan area of Tarim Basin

  • Xiuxiang Lü
  • Zhijun Jin
  • Xinyuan Zhou
  • Ning Yang
  • Qinghua Wang
  • Wenqing Pan
Articles

Abstract

Lunnan heave had experienced denudation during late Caledonian and Hercynian movements and reconstruction during Indosinian movement. Lunnan heave and its circumference areas are located on the direction of petroleum migration, and experienced three reservoir formation cycles that are divided by wave cycle: The first reservoir formation cycle is characterized by breakage, the second by alteration, and the third by enrichment. Three layers of dissolving-cave developed on the vertical in Lunnan area. Development degree of slit-cave system and their connectivity are important factors to control petroleum enrichment in the weathering crust reservoir. The area where dissolving-caves are communicated by silts and faults was a fine petroleum enrichment area, and water was often encountered in the area with isolation cave while drilling because of no oil and gas origin. The top part of the faulted-horst as a leaking area is bearing water area, and the higher part of slope nearing the top part of the faulted-horst as a high seepage area is a heavy oil area due to lack of fine cap rock, and the lower part of slope and the platform are light and condensate oil area. The area with the middle-upper Ordovician is the favorable area to explore original carbonate reservoir formed in the earlier stage. The best favorable petroleum enrichment area for carbonates is surrounding Lunnan heave along the slope down to the direction of sags. The precondition to discover petroleum in carbonates is accurately prognosticating the distribution area of silts and caves, and the key to improving the exploration success ratio is accurately recognizing silts and small faults.

Keywords

Carbonates reservoir formation cycle petroleum accumulation in weathering crust Lunnan area Tarim Basin 

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Copyright information

© Science in China Press 2004

Authors and Affiliations

  • Xiuxiang Lü
    • 1
    • 2
  • Zhijun Jin
    • 3
  • Xinyuan Zhou
    • 1
    • 4
  • Ning Yang
    • 1
    • 2
  • Qinghua Wang
    • 4
  • Wenqing Pan
    • 4
  1. 1.Basin & Reservoir Research CenterUniversity of PetroleumBeijingChina
  2. 2.Key Laboratory for Petroleum Accumulation MechanismUniversity of Petroleum, Ministry of EducationBeijingChina
  3. 3.Petroleum Exploration & Production Research Institute of SinopecBeijingChina
  4. 4.Tarim Oil Field CompanyKuerleChina

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