Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (5): 21-27.doi: 10.3969/j.issn.1673-8926.2011.05.005

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Study on diagenesis of Jurassic sandstone reservoirs in Lunnan area, Tarim Basin

XU Xiongfei1， WANG Jiawei1， YANG Bo1， XING Yi2， ZHOU Guobao3， CAO Ronghao1   

  1. 1. School of Earth Sciences and Resources， Chang’an University， Xi’an 710054， China； 2. Department of Development， Yanchang Petroleum Co. Ltd.， Yan’an 716000， China； 3. Dingbian Oil Production Plant， Yanchang Petroleum Co. Ltd.， Yan’an 716000， China
  • Online:2011-10-20 Published:2011-10-20

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Abstract:

Based on cast slice, scanning electronic microscope, X-diffraction, cathodoluminescence and physical properties, combined with previous researhes, the diagenesis of Jurassic sandstone reservoirs in Lunnan area, Tarim Basin is analyzed, and the types of diagenesis are defined. The study on diagenetic evolutionary series shows that the diagenetic evolution of Jurassic sandstone has already been in B stage of early diagenesis to initial period of A stage of late diagenesis, with the latter being the majority. Compaction destroyed the primary pore structure of Jurassic sandstone intensively. The strong dissolution of feldspar particles at the A stage of late diagenesis made the dissolved pores develop in Lower Jurassic sandstone reservoirs, which constitutes the necessary space for oil and gas accumulation. The intergranular micropores developed in illite, chlorite, illite-smectite mixed-layer greatly improved the reservoir performance ofMiddle and Upper Jurassic sandstone.

Key words: pore structure, characteristic parameters, capillary pressure curve, Chang 6 reservoir, Ansai Oilfield

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