Petroleum Reservoir Evaluation and Development >
2022 , Vol. 12 >Issue 3: 437 - 444
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2022.03.005
Pore characteristics and evaluation of shale reservoir in Lower Carboniferous Luzhai Formation, northern part of middle Guangxi Depression
Received date: 2020-11-04
Online published: 2022-06-24
The upper Paleozoic Marine shale in middle Guangxi Depression, namely Guizhong Depression, has experienced complex tectonic evolution and thermal evolution. As the main production layer of shale gas, the microscopic pore structure characterization and reservoir pore evaluation of the shale in lower Carboniferous need to be studied urgently. Focus on the Lower Carboniferous Luzhai Formation shale reservoir in the northern Guizhong Depression, the material composition and reservoir pores of the shale are characterized and evaluated in detail by rock thin section, scanning electron microscope, Xray diffraction, porosity and isothermal adsorption tests on samples both from fields and cores. The results show that the TOC in the shale of Luzhai Formation is 0.4 % ~ 6.6 %. The organic matter is in the stage of high mature to over-mature thermal evolution. The content of brittle minerals such as quartz is high, with a good fracturing ability. The shale in Luzhai Formation, with an average porosity of 2.91 % and an average permeability of 0.007 9 ×10-3μm2, is a kind of low porosity, ultra-low permeability and good breakthrough pressure shale gas reservoir. There are five types of pores in the shale reservoir: the residual intergranular pore, intergranular pore, intragranular dissolved pore, clay minerals interlayer pore and organic pore. The main contributors are the clay minerals interlayer pores, the organic pores and the pyrite intergranular pores. The aperture rangs from 17 nm to 65 nm, most of which are microporous or mesoporous with the scale less than 50 nm. The connectivity between the pores is poor and there is a certain connectivity inside the pores.
Jinyu TAO , Baojian SHEN , Zongquan HU , Anyang PAN . Pore characteristics and evaluation of shale reservoir in Lower Carboniferous Luzhai Formation, northern part of middle Guangxi Depression[J]. Petroleum Reservoir Evaluation and Development, 2022 , 12(3) : 437 -444 . DOI: 10.13809/j.cnki.cn32-1825/te.2022.03.005
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