Evolution mechanism of micro/nano-scale pores in volcanic weathering crust reservoir in the Kalagang Formation in Santanghu Basin and their relationship with oil-bearing property

被引：0
|
作者：
Tian W. [1 ,2 ,3 ]
Lu S. [1 ,3 ]
Wang W. [1 ,2 ,3 ]
Li J. [1 ,3 ]
Li Z. [1 ,2 ,3 ]
Li J. [1 ,3 ]
机构：
[1] Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, 266580, Shandong
[2] Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Qingdao, 266590, Shandong
[3] School of Geosciences, China University of Petroleum (East China), Qingdao, 266580, Shandong
[4] Exploration and Development Research Institute of Tuha Oilfield Company Ltd., PetroChina, Kumul, 839000, Xinjiang
来源：
Oil and Gas Geology | 2019年 / 40卷 / 06期
关键词：
Evolution mechanism; Oil-bearing property; Pore structure; Santanghu Basin; Volcanic weathering crust reservoir;
D O I：
10.11743/ogg20190612
中图分类号：
学科分类号：
摘要：
Various data including casting thin section, scanning electron microscopy (SEM), XRD whole-rock mineral analysis, low-temperature nitrogen adsorption (LTNA) and high pressure mercury injection (HPMI) experiments are integrated to characterize the micro/nano-scale pore structure of the volcanic weathering crust reservoir in the Kalagang Formation (C2k), Santanghu Basin, study in-depth the evolution mechanism of micro/nano-scale pores, and reveal the effect of pore throat structure on the oil-bearing property of reservoir in combination with oil/gas shows and formation testing data.The results show as follows.Four types of reservoir space, namely dissolution pores, residual pores, intercrystalline pores and fractures, are recognized in the volcanic weathering crust reservoir.The adsorption-desorption isotherm curves are dominated by hysteresis loops of Type H2 or near Type H2, and the efficiency of mercury ejection is quite low, varying from 24.26% to 44.91%, in samples as a whole, suggesting that the pores are mainly ink-bottle shaped.The reservoir is dominated by a pore size of below 1 μm, with micro-scale residual pores and dissolved pores developed locally.The lower content of pyroxene and the higher content of plagioclase in the original mineral composition of the volcanic rocks, will result in the development of low-content chlorite and high-content zeolite in the post-magmatic hydrothermal stage.Thereafter the volcanic reservoir can be effectively modified and get better in quality.The Swanson parameter and rapex can well demonstrate its matrix permeability.However, the Swanson parameter is closely related with the oil-bearing property of volcanic weathering crust reservoirs.When the Swanson parameter is greater than 2, the reservoirs are the oil layers; when it varies between 0.86 and 2, the reservoirs are poor pay zones; while when it is less than 0.86, the reservoirs are mostly dry layers.In conclusion, the Swanson parameter can be used as a key parameter to indicate the oil-bearing property of reservoir, and provide a basis for play fairway selection. © 2019, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：1281 / 1294and1307
相关论文
共 33 条
  • [1] Li G., The forming condition and the key controlling factor of the upper Carboniferous volcanic oil pool in Malang Sag of Santanghu Basin, (2010)
  • [2] Dong G., Zhang Q., Zhu X., Et al., Current status and problems of volcanic reservoir study: an example from theLower Permian volcanic rocks in Ke-Xia area of Junggar Basin, Oil & Gas Geology, 33, 4, pp. 511-519, (2012)
  • [3] Li S., Chen F., Qi W., Et al., Relationship between weathering crust characteristics and hydrocarbon accumulation of Lower Permian in Malang Sag, Santanghu Basin, Xinjiang Petro-leum Geology, 28, 5, pp. 554-556, (2007)
  • [4] Liu J., Zhu Y., Li Z., Et al., Characteristics and controlling factors of volcanic reservoir ofCarboniferous in Santanghu Basin, Lithologic Reservoirs, 21, 3, pp. 23-28, (2009)
  • [5] Li G., Mao S., Chen F., Et al., Key controlling factors and exploration direction of volcanic reservoir in Kalagang Formation of Malang Sag in Santanghu Basin, China Petroleum Exploration, 15, 1, pp. 11-15, (2010)
  • [6] Huang Z., Liu B., Luo Q., Et al., Main controlling factors and models of Carboniferous volcanic hydrocarbon accumulation in the Malang Sag, Santang Basin, Acta Geologica Sinica, 86, 8, pp. 1210-1216, (2012)
  • [7] Zheng M., Wu X., Li J., Et al., Characteristics of volcanic reservoir and process of petroleum entrapment in Santanghu Basin, Chinese Journal of Geology, 48, 4, pp. 1246-1257, (2013)
  • [8] Song M., Zhao L., Wu W., Et al., Structure and reservoir-controlling of top Carboniferous weathering crust in Chepaizi area, Junggar Basin, Oil & Gas Geology, 37, 3, pp. 313-321, (2016)
  • [9] Zhu B., Feng J., Hu B., Et al., An understanding of the basement of Santanghu Basin, Xinjiang Petroleum Geology, 18, 3, pp. 197-200, (1997)
  • [10] Liu X., Zheng J., Yang X., Et al., Paleozoic structural evolution of Santanghu Basin and its surrounding and prototype basin recovery, Natural Gas Geoscience, 21, 6, pp. 947-954, (2010)
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