三塘湖盆地卡拉岗组火山岩风化壳储层微纳米孔隙演变机制及与含油性关系

doi:10.11743/ogg20190612

Abstract

Abstract: 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 r_apex 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.

Key words: pore structure, evolution mechanism, oil-bearing property, volcanic weathering crust reservoir, Santanghu Basin

CLC Number:

TE122.2

Tian Weichao, Lu Shuangfang, Wang Weiming, Li Jinbu, Li Zhuang, Li Jie. 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[J]. Oil & Gas Geology, 2019, 40(6): 1281-1294,1307.

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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

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