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Volume 23 Issue 4
Aug 2012
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Qianglu CHEN, Yongqiang ZHAO, Guorong LI, Chenglin CHU, Bin WANG. Features and controlling factors of epigenic karstification of the Ordovician carbonates in Akekule arch, Tarim Basin. Journal of Earth Science, 2012, 23(4): 506-515. doi: 10.1007/s12583-012-0271-4
Citation: Qianglu CHEN, Yongqiang ZHAO, Guorong LI, Chenglin CHU, Bin WANG. Features and controlling factors of epigenic karstification of the Ordovician carbonates in Akekule arch, Tarim Basin. Journal of Earth Science, 2012, 23(4): 506-515. doi: 10.1007/s12583-012-0271-4

Features and controlling factors of epigenic karstification of the Ordovician carbonates in Akekule arch, Tarim Basin

doi: 10.1007/s12583-012-0271-4
Funds:

the Scientific Research Project of SINOPEC Scientific Development Department P08062

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  • Corresponding author: Qianglu CHEN, chenqianglu2006@126.com
  • Received Date: 20 Feb 2012
  • Accepted Date: 05 May 2012
  • Publish Date: 01 Aug 2012
  • Tabei (塔北) uplift is an area with the highest hydrocarbon enrichment in Tarim basin,and large oilfields have been found on Akekule (阿克库勒) arch at the middle section of Tabei uplift,with Ordovician carbonate reservoirs. Storage space of the Ordovician carbonate reservoirs in the Akekule arch are mainly caves,pores and fractures resulted from dissolution and/or karstification. The Ordovician carbonate reservoirs are affected and modified by the diagenetic process in penecontemporaneous,epigenetic and burial periods and the multi-stage karstification related with deep hydrothermal activities,among which the most significant effect is from the meteoric water karstification related to the tectonic uplift from the end of Middle Ordovician to the end of Late Ordovician (end of O2-end of O3) and at the end of Middle Devonian (end of D2). Varied palaeogeologic settings and tectonic features at different geologic periods lead to different fluid flowing patterns,karstification mechanisms and transformation features in different regions,which further influence the reservoir distribution. The paleo-uplifts at different periods,such as end of O2-end of O3 and end of D2,control the dominant development zones of karstification; the paleogeomorphology and faults resulted from tectonic uplift control the flowing depth of the karst fluid; and the lithology controls the position and extent of karst development.

     

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