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Article Navigation >  Acta Sedimentologica Sinica  > 2016  >  34(1): 158-167

CAO Gang, WANG XingXing, ZHU XiaoMin, QU QuanGong, WUCHEN BingJie, HE JingCong, DAI BoYi. Diagenetic Evolution of Es3x Nearshore Subaqueous Fan Reservoir and Its Influence on Property in the Steep Slope Zone of Western Chezhen Sub-sag[J]. Acta Sedimentologica Sinica, 2016, 34(1): 158-167. doi: 10.14027/j.cnki.cjxb.2016.01.015
Citation: CAO Gang, WANG XingXing, ZHU XiaoMin, QU QuanGong, WUCHEN BingJie, HE JingCong, DAI BoYi. Diagenetic Evolution of Es3x Nearshore Subaqueous Fan Reservoir and Its Influence on Property in the Steep Slope Zone of Western Chezhen Sub-sag[J]. Acta Sedimentologica Sinica, 2016, 34(1): 158-167. doi: 10.14027/j.cnki.cjxb.2016.01.015
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Diagenetic Evolution of Es3x Nearshore Subaqueous Fan Reservoir and Its Influence on Property in the Steep Slope Zone of Western Chezhen Sub-sag

doi: 10.14027/j.cnki.cjxb.2016.01.015
  • 1.

    Shengli Oilfield Company, SINPEC, Dongying, Shandong 257015, China;

  • 2.

    State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102247, China;

  • 3.

    College of Geosciences, China University of Petroleum, Beijing 102249, China

Funds:  National Natural Science Foundation of China, NO.41272133; National Science and Technology Major Project, NO.2012ZX05001-002-01
  • Received Date: 2015-01-07
  • Rev Recd Date: 2015-04-15
  • Publish Date: 2016-02-10
  • Based on the core, casting thin section, SEM, cathodeluminescence and petrophysical properties analysis data, the characteristics of the Es3x nearshore subaqueous fan reservoir in the steep slope zone of Western Chezhen Sub-sag are discussed. The results show that lithology types are mainly the mud matrix-supported conglomerate, clast-supported conglomerate, pebbly sandstone and so on at macro level, and the microscopic lithology types are showed as lithic sandstone and feldspathic lithic sandstone and their plaster matrix content can be up to 40% for the nearshore subaqueous fan reservoir of Es3X in the steep slope zone of the Western Chezhen sub-sag. The nearshore subaqueous fan reservoir is characterized with extremely low porosity and permeability, and their porosity and permeability are respectively 3.42%, 2.02×10-3 μm2, but there is an abnormal high porosity zone between 3 500 m and 4 000 m in the verticle section, where the porosity can be 10.2% and the reservoir space are mainly dissolved pores and micro-fractures. The reservoir had experienced complex diagenesis in the study area and it is in the B sub-stage of middle diagenesis. The reservoir diagenesis evolution sequence in the study area is as follows: compaction/carbonate cementation→ dissolution of feldspars and carbonate cements→dissolution of quartz/carbonate cementation/plaster recrystallization→quartz overgrowth/carbonate cementation dissolution→carbonate cementation. The different sub-facies of the nearshore subaqueous fan had experienced different diagenesis evolution, because the middle- distal zones of the braided channel of the middle fan and middle fan front had experienced multi-period dissolution, the relative reservoir quality is very good and their average porosity respectively are 4.5% and 7.25%, which can be regarded as the "sweet spot" of the nearshore subaqueous fan glutinite reservoir in the steep slope zone of the Western Chezhen sub-sag.
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  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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  • Received:  2015-01-07
  • Revised:  2015-04-15
  • Published:  2016-02-10

Diagenetic Evolution of Es3x Nearshore Subaqueous Fan Reservoir and Its Influence on Property in the Steep Slope Zone of Western Chezhen Sub-sag

doi: 10.14027/j.cnki.cjxb.2016.01.015
  • 1. Shengli Oilfield Company, SINPEC, Dongying, Shandong 257015, China;
  • 2. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102247, China;
  • 3. College of Geosciences, China University of Petroleum, Beijing 102249, China
Funds:  National Natural Science Foundation of China, NO.41272133; National Science and Technology Major Project, NO.2012ZX05001-002-01
  • Received Date: 2015-01-07
  • Rev Recd Date: 2015-04-15
  • Publish Date: 2016-02-10

Abstract: Based on the core, casting thin section, SEM, cathodeluminescence and petrophysical properties analysis data, the characteristics of the Es3x nearshore subaqueous fan reservoir in the steep slope zone of Western Chezhen Sub-sag are discussed. The results show that lithology types are mainly the mud matrix-supported conglomerate, clast-supported conglomerate, pebbly sandstone and so on at macro level, and the microscopic lithology types are showed as lithic sandstone and feldspathic lithic sandstone and their plaster matrix content can be up to 40% for the nearshore subaqueous fan reservoir of Es3X in the steep slope zone of the Western Chezhen sub-sag. The nearshore subaqueous fan reservoir is characterized with extremely low porosity and permeability, and their porosity and permeability are respectively 3.42%, 2.02×10-3 μm2, but there is an abnormal high porosity zone between 3 500 m and 4 000 m in the verticle section, where the porosity can be 10.2% and the reservoir space are mainly dissolved pores and micro-fractures. The reservoir had experienced complex diagenesis in the study area and it is in the B sub-stage of middle diagenesis. The reservoir diagenesis evolution sequence in the study area is as follows: compaction/carbonate cementation→ dissolution of feldspars and carbonate cements→dissolution of quartz/carbonate cementation/plaster recrystallization→quartz overgrowth/carbonate cementation dissolution→carbonate cementation. The different sub-facies of the nearshore subaqueous fan had experienced different diagenesis evolution, because the middle- distal zones of the braided channel of the middle fan and middle fan front had experienced multi-period dissolution, the relative reservoir quality is very good and their average porosity respectively are 4.5% and 7.25%, which can be regarded as the "sweet spot" of the nearshore subaqueous fan glutinite reservoir in the steep slope zone of the Western Chezhen sub-sag.

CAO Gang, WANG XingXing, ZHU XiaoMin, QU QuanGong, WUCHEN BingJie, HE JingCong, DAI BoYi. Diagenetic Evolution of Es3x Nearshore Subaqueous Fan Reservoir and Its Influence on Property in the Steep Slope Zone of Western Chezhen Sub-sag[J]. Acta Sedimentologica Sinica, 2016, 34(1): 158-167. doi: 10.14027/j.cnki.cjxb.2016.01.015
Citation: CAO Gang, WANG XingXing, ZHU XiaoMin, QU QuanGong, WUCHEN BingJie, HE JingCong, DAI BoYi. Diagenetic Evolution of Es3x Nearshore Subaqueous Fan Reservoir and Its Influence on Property in the Steep Slope Zone of Western Chezhen Sub-sag[J]. Acta Sedimentologica Sinica, 2016, 34(1): 158-167. doi: 10.14027/j.cnki.cjxb.2016.01.015
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